Introduction
Colmena is a simple, stateless NixOS deployment tool modeled after NixOps and morph, written in Rust.
It's a thin wrapper over Nix commands like nix-instantiate and nix-copy-closure, and supports parallel deployment.
Interested? Get started here!
$ colmena apply --on @tag-a [INFO ] Enumerating nodes... [INFO ] Selected 7 out of 45 hosts. (...) ✅ 0s Build successful sigma 🕗 7s copying path '/nix/store/h6qpk8rwm3dh3zsl1wlj1jharzf8aw9f-unit-haigha-agent.service' to 'ssh://root@sigma.redacted'... theta ✅ 7s Activation successful gamma 🕘 8s Starting... alpha ✅ 1s Activation successful epsilon 🕗 7s copying path '/nix/store/fhh4rfixny8b21l6jqzk7nqwxva5k20h-nixos-system-epsilon-20.09pre-git' to 'ssh://root@epsilon.redacted'... beta 🕗 7s removing obsolete file /boot/kernels/z28ayg10kpnlrz0s2qrb9pzv82lc20s2-initrd-linux-5.4.89-initrd kappa ✅ 2s Activation successful
You are currently reading version 0.4 of the Colmena Manual, built against version 0.4.0.
Links
Tutorial
Installation
colmena is included in Nixpkgs beginning with 21.11.
For this tutorial, use the following command to enter an ephemeral environment with the colmena command:
nix-shell -p colmena
If you are interested in trying out the bleeding-edge version of Colmena, Read the unstable version of the Manual for instructions.
Basic Configuration
If you use Nix Flakes, follow the Flake version here.
Colmena should work with your existing NixOps and morph configurations with minimal modification (see Migrating from NixOps/morph).
Here is a sample hive.nix with two nodes, with some common configurations applied to both nodes:
{
meta = {
# Override to pin the Nixpkgs version (recommended). This option
# accepts one of the following:
# - A path to a Nixpkgs checkout
# - The Nixpkgs lambda (e.g., import <nixpkgs>)
# - An initialized Nixpkgs attribute set
nixpkgs = <nixpkgs>;
# You can also override Nixpkgs by node!
nodeNixpkgs = {
node-b = ./another-nixos-checkout;
};
# If your Colmena host has nix configured to allow for remote builds
# (for nix-daemon, your user being included in trusted-users)
# you can set a machines file that will be passed to the underlying
# nix-store command during derivation realization as a builders option.
# For example, if you support multiple orginizations each with their own
# build machine(s) you can ensure that builds only take place on your
# local machine and/or the machines specified in this file.
# machinesFile = ./machines.client-a;
};
defaults = { pkgs, ... }: {
# This module will be imported by all hosts
environment.systemPackages = with pkgs; [
vim wget curl
];
# By default, Colmena will replace unknown remote profile
# (unknown means the profile isn't in the nix store on the
# host running Colmena) during apply (with the default goal,
# boot, and switch).
# If you share a hive with others, or use multiple machines,
# and are not careful to always commit/push/pull changes
# you can accidentaly overwrite a remote profile so in those
# scenarios you might want to change this default to false.
# deployment.replaceUnknownProfiles = true;
};
host-a = { name, nodes, ... }: {
# The name and nodes parameters are supported in Colmena,
# allowing you to reference configurations in other nodes.
networking.hostName = name;
time.timeZone = nodes.host-b.config.time.timeZone;
boot.loader.grub.device = "/dev/sda";
fileSystems."/" = {
device = "/dev/sda1";
fsType = "ext4";
};
};
host-b = {
# Like NixOps and Morph, Colmena will attempt to connect to
# the remote host using the attribute name by default. You
# can override it like:
deployment.targetHost = "host-b.mydomain.tld";
# It's also possible to override the target SSH port.
# For further customization, use the SSH_CONFIG_FILE
# environment variable to specify a ssh_config file.
deployment.targetPort = 1234;
# Override the default for this target host
deployment.replaceUnknownProfiles = false;
# You can filter hosts by tags with --on @tag-a,@tag-b.
# In this example, you can deploy to hosts with the "web" tag using:
# colmena apply --on @web
# You can use globs in tag matching as well:
# colmena apply --on '@infra-*'
deployment.tags = [ "web" "infra-lax" ];
time.timeZone = "America/Los_Angeles";
boot.loader.grub.device = "/dev/sda";
fileSystems."/" = {
device = "/dev/sda1";
fsType = "ext4";
};
};
}
The full set of deployment options can be found here.
Now you are ready to use Colmena! To build the configuration:
colmena build
To build and deploy to all nodes:
colmena apply
Next Steps
- Head to the Features section to see what else Colmena can do.
- Read more about options available in Colmena in the Reference section.
Usage with Flakes
Installation
colmena is included in Nixpkgs beginning with 21.11.
For this tutorial, use the following command to enter an ephemeral environment with the colmena command:
nix shell nixpkgs#colmena
If you are interested in trying out the bleeding-edge version of Colmena, Read the unstable version of the Manual for instructions.
Basic Configuration
Colmena reads the colmena output in your Flake.
Here is a short example:
{
inputs = {
nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
};
outputs = { nixpkgs, ... }: {
colmena = {
meta = {
nixpkgs = import nixpkgs {
system = "x86_64-linux";
overlays = [];
};
};
host-a = { name, nodes, pkgs, ... }: {
boot.isContainer = true;
time.timeZone = nodes.host-b.config.time.timeZone;
};
host-b = {
deployment = {
targetHost = "somehost.tld";
targetPort = 1234;
targetUser = "luser";
};
boot.isContainer = true;
time.timeZone = "America/Los_Angeles";
};
};
};
}
The full set of deployment options can be found here.
You can also check out the example in the main tutorial for some inspiration.
Now you are ready to use Colmena! To build the configuration:
colmena build
To build and deploy to all nodes:
colmena apply
Next Steps
- Head to the Features section to see what else Colmena can do.
- Read more about options available in Colmena in the Reference section.
Migrating from NixOps/morph
Colmena should work with existing NixOps and morph configurations with minimal modification. That said, there are a few things to look out for:
Colmena deploys to existing NixOS hosts
Unlike NixOps which can be configured to manage the entire lifecycles of NixOS machines (e.g., spinning up AWS EC2 instances), Colmena can only deploy to hosts already running NixOS.
network vs meta
Colmena accepts a set of options to configure the deployment itself as meta.
For NixOps compatibility, it also accepts network as an alias so you don't have to change your existing configuration.
Pinning Nixpkgs
You can pin the nixpkgs version by setting meta.nixpkgs (or network.nixpkgs if you use the alias).
This is required if you use Flakes.
The options accepts one of the following:
- Path to a Nixpkgs checkout (not supported in Flakes)
- Example:
./nixpkgs
- Example:
- The Nixpkgs lambda returned by importing its
default.nix(not supported in Flakes)- Example:
import ./nixpkgs
- Example:
- A fully initialized Nixpkgs attribute set
- Example:
import ./nixpkgs { system = "x86_64-linux"; }
- Example:
Features
This section introduces the main features in Colmena:
- Node Tagging - Deploying to a subset of tagged nodes
- Local Deployment - Deploying to the host running Colmena itself
- Secrets - Deploying sensitive files separate from the main configuration
- Ad Hoc Evaluation - Evaluating a Nix expression with access to your configuration
- Parallelism - Controlling how Colmena parallelizes the deployment process
- Remote Builds - Building system profiles on remote machines
Node Tagging
With node tags, you can quickly select a subset of nodes for deployment.
You can specify tags using the deployment.tags option:
{
alpha = { pkgs, ... }: {
deployment.tags = [ "web" "infra-lax" ];
# ... Rest of configuration ...
};
beta = { pkgs, ... }: {
deployment.tags = [ "infra-sfo" ];
# ... Rest of configuration ...
};
}
You can filter hosts by tags or names with --on, which accepts a comma-separated list of node names or @tags.
To select all nodes with web:
$ colmena apply --on @web
Wildcards are supported as well.
To select all nodes with a tag beginning with infra-:
$ colmena apply --on '@infra-*'
(Note the quotes around the argument)
Local Deployment
For some machines, you may still want to stick with the manual nixos-rebuild-type of workflow.
Colmena allows you to build and activate configurations on the host running Colmena itself, provided that:
- The node must be running NixOS.
- The node must have
deployment.allowLocalDeploymentset totrue. - The node's attribute name must match the hostname of the machine.
If you invoke apply-local with --sudo, Colmena will attempt to elevate privileges with sudo if it's not run as root.
You may also find it helpful to set deployment.targetHost to null if you don't intend to deploy to the host via SSH.
As an example, the following hive.nix includes a node (laptop) that is meant to be only deployed with apply-local:
{
meta = {
nixpkgs = ./deps/nixpkgs-stable;
# I'd like to use the unstable version of Nixpkgs on
# my desktop machines.
nodeNixpkgs = {
laptop = ./deps/nixpkgs-unstable;
};
};
# This attribute name must match the output of `hostname` on your machine
laptop = { name, nodes, ... }: {
networking.hostName = "laptop";
deployment = {
# Allow local deployment with `colmena apply-local`
allowLocalDeployment = true;
# Disable SSH deployment. This node will be skipped in a
# normal`colmena apply`.
targetHost = null;
};
# ... Rest of configuration ...
};
server-a = { pkgs, ... }: {
# This node will use the default Nixpkgs checkout specified
# in `meta.nixpkgs`.
# ... Rest of configuration ...
};
}
On laptop, run colmena apply-local --sudo to activate the configuration.
Secrets
Colmena allows you to upload secret files that will not be stored in the Nix store to nodes.
It implements a subset of the deployment.keys options supported by NixOps.
For example, to deploy DNS-01 credentials for use with security.acme:
{
shared-box = {
security.acme.certs."my-site.tld".credentialsFile = "/run/keys/acme-credentials.secret";
deployment.keys."acme-credentials.secret" = {
# Alternatively, `text` (string) or `keyFile` (path to file)
# may be specified.
keyCommand = [ "vault" "read" "-field=env" "secret/dns01" ];
destDir = "/run/keys"; # Default: /run/keys
user = "acme"; # Default: root
group = "nginx"; # Default: root
permissions = "0640"; # Default: 0600
uploadAt = "pre-activation"; # Default: pre-activation, Alternative: post-activation
};
# Rest of configuration...
};
}
Take note that if you use the default path (/run/keys), the secret files are only stored in-memory and will not survive reboots.
To upload your secrets without performing a full deployment, use colmena upload-keys.
Key Services
For each secret file deployed using deployment.keys, a systemd service with the name of ${name}-key.service is created (acme-credentials.secret-key.service for the example above).
This unit is only active when the corresponding file is present, allowing you to set up dependencies for services requiring secret files to function.
Key Permissions
The /run/keys directory is owned by the keys group. If you are using a
systemd service running as a non-root user, you will likely need to add:
SupplementaryGroups = [ "keys" ];
to your service configuration.
Flakes
If you are using flakes, Nix will copy the entire flake (everything tracked by git) into the Nix store during evaluation.
This means that all files as checked out by git are world-readable, including the ones managed by filter-based encryption tools like git-crypt.
To use deployment.keys.<name>.keyFile with flakes without having the secrets copied to the Nix store, a quoted absolute path can be used.
Ad Hoc Evaluation
Sometimes you may want to extract values from your Hive configuration for consumption in another program (e.g., OctoDNS).
To do that, create a .nix file with a lambda:
{ nodes, pkgs, lib, ... }:
# Feels like a NixOS module - But you can return any JSON-serializable value
lib.attrsets.mapAttrs (k: v: v.config.deployment.targetHost) nodes
Then you can obtain a JSON output with:
$ colmena eval target-hosts.nix
{"alpha":"fd12:3456::1","beta":"fd12:3456::2"}
You can also specify an expression directly on the command line:
$ colmena eval -E '{ nodes, pkgs, lib, ... }: ...'
Instantiation
You may directly instantiate an expression that evaluates to a derivation:
$ colmena eval --instantiate -E '{ nodes, ... }: nodes.alpha.config.boot.kernelPackages.kernel'
/nix/store/7ggmhnwvywrqcd1z2sdpan8afz55sw7z-linux-5.14.14.drv
Interactive REPL
To explore the configurations interactively, start a REPL session with colmena repl:
$ colmena repl
[INFO ] Using flake: git+file:///home/user/cluster
Welcome to Nix 2.10.3. Type :? for help.
Loading installable ''...
Added 3 variables.
nix-repl> nodes.alpha.config.deployment.targetHost
"fd12:3456::1"
Parallelism
Colmena is built from the ground up to support parallel deployments. Evaluation, build, and deployment of node configurations can happen at the same time.
Configuration
The parallelism of Colmena can be controlled through two flags:
--limit <number>
Number of hosts to deploy at once in the final step (pushing closures and activating new profiles). The default value is 10.
--eval-node-limit <number>
By default, Colmena will automatically determine the maximum number of nodes to evaluate at the same time according to available RAM. This flag allows you to set the limit to a predetermined value.
Parallel Evaluation (Experimental)
By default, Colmena evaluates nodes in batches according to available RAM using Nix's built-in single-threaded evaluator. Experimental support is available for using nix-eval-jobs as the evaluator.
When nix-eval-jobs is enabled via --evaluator streaming, evaluation is parallelized with deployment processes kicked off as individual nodes finish evaluating.
Remote Builds
If the host running Colmena is not powerful enough, consider offloading the actual builds to remote machines. Colmena supports two ways to achieve this:
Using Colmena's deployment.buildOnTarget
If you set deployment.buildOnTarget = true; for a node, then the actual build process will be initiated on the node itself.
Colmena will evaluate the configuration locally before copying the derivations to the target node.
You can temporarily enable this for all nodes by passing --build-on-target on the command line, or disable it with --no-build-on-target.
This is most useful in scenarios where the machine running Colmena is bandwidth-constrained, or it's inconvenient to configure designated builders beforehand. With this method, the build results will not be copied back to the local machine or otherwise shared across the target nodes. If you have custom packages used on multiple nodes, the work required to build those packages will be duplicated across the nodes.
Using the native distributed build feature in Nix
When distributed build is enabled, Nix will transparently forward builds to the configured builders. After the builds are done, Nix will copy the results back to the local machine.
Builders can either be configured globally or in your configuration with meta.machinesFile.
Examples
This section contains examples of setups people commonly use:
- Multi-Architecture Deployments - Deploying to hosts running a foreign architecture
Multi-Architecture Deployments
You can deploy to hosts running different architectures with a single configuration. There are two ways to achieve this:
Using binfmt Emulation
On Linux hosts, you can run builds through transparent binary emulation using QEMU and binfmt-misc.
This following example sets up binfmt, allowing an X86-64 host (laptop) to build derivations for an AArch64 host (rpi) through QEMU:
{
# The NixOS machine you are running Colmena on (x86_64-linux)
laptop = { pkgs, ... }: {
# Enable binfmt emulation for aarch64-linux
boot.binfmt.emulatedSystems = [ "aarch64-linux" ];
# ... Rest of configuration ...
};
# The remote machine running a foreign architecture (aarch64-linux)
rpi = { pkgs, ... }: {
# Override nixpkgs architecture
nixpkgs.system = "aarch64-linux";
# ... Rest of configuration ...
};
}
(For Flake users, the above attribute set is the value of outputs.colmena)
First, deploy the local configuration with colmena apply-local --sudo.
For more information on what is required on the local system, see Local Deployment.
After the new configuration is activated, binfmt emulation will be set up on the local machine.
You can then deploy to the rpi node with colmena apply --on rpi.
Building Remotely
If the remote nodes are powerful enough, you may also execute builds on them directly. See Remote Builds for more details.
Reference
This section contains detailed listings of options and parameters accepted by Colmena:
Deployment Options
Colmena adds a set of extra options that can be used in your NixOS configurations under the deployment prefix.
deployment.allowLocalDeployment
Allow the configuration to be applied locally on the host running Colmena.
For local deployment to work, all of the following must be true:
- The node must be running NixOS.
- The node must have deployment.allowLocalDeployment set to true.
- The node’s networking.hostName must match the hostname.
To apply the configurations locally, run colmena apply-local.
You can also set deployment.targetHost to null if the nost is not
accessible over SSH (only local deployment will be possible).
Type: boolean
Default:
false
deployment.buildOnTarget
Whether to build the system profiles on the target node itself.
When enabled, Colmena will copy the derivation to the target
node and initiate the build there. This avoids copying back the
build results involved with the native distributed build
feature. Furthermore, the build goal will be equivalent to
the push goal. Since builds happen on the target node, the
results are automatically “pushed” and won’t exist in the local
Nix store.
You can temporarily override per-node settings by passing
--build-on-target (enable for all nodes) or
--no-build-on-target (disable for all nodes) on the command
line.
Type: boolean
Default:
false
deployment.keys
A set of secrets to be deployed to the node.
Secrets are transferred to the node out-of-band and never ends up in the Nix store.
Type: attribute set of (submodule)
Default:
{ }
deployment.keys.<name>.destDir
Destination directory on the host.
Type: path
Default:
"/run/keys"
deployment.keys.<name>.group
The group that will own the file.
Type: string
Default:
"root"
deployment.keys.<name>.keyCommand
Command to run to generate the key.
One of text, keyCommand and keyFile must be set.
Type: null or (list of string)
Default:
null
deployment.keys.<name>.keyFile
Path of the local file to read the key from.
One of text, keyCommand and keyFile must be set.
Type: null or path
Default:
null
deployment.keys.<name>.name
File name of the key.
Type: string
Default:
"‹name›"
deployment.keys.<name>.permissions
Permissions to set for the file.
Type: string
Default:
"0600"
deployment.keys.<name>.text
Content of the key.
One of text, keyCommand and keyFile must be set.
Type: null or string
Default:
null
deployment.keys.<name>.uploadAt
When to upload the keys.
- pre-activation (default): Upload the keys before activating the new system profile.
- post-activation: Upload the keys after successfully activating the new system profile.
For colmena upload-keys, all keys are uploaded at the same time regardless of the configuration here.
Type: one of “pre-activation”, “post-activation”
Default:
"pre-activation"
deployment.keys.<name>.user
The group that will own the file.
Type: string
Default:
"root"
deployment.privilegeEscalationCommand
Command to use to elevate privileges when activating the new profiles on SSH hosts.
This is used on SSH hosts when deployment.targetUser is not root.
The user must be allowed to use the command non-interactively.
Type: list of string
Default:
[
"sudo"
"-H"
"--"
]
deployment.replaceUnknownProfiles
Allow a configuration to be applied to a host running a profile we have no knowledge of. By setting this option to false, you reduce the likelyhood of rolling back changes made via another Colmena user.
Unknown profiles are usually the result of either:
- The node had a profile applied, locally or by another Colmena.
- The host running Colmena garbage-collecting the profile.
To force profile replacement on all targeted nodes during apply,
use the flag --force-replace-unknown-profiles.
Type: boolean
Default:
true
deployment.tags
A list of tags for the node.
Can be used to select a group of nodes for deployment.
Type: list of string
Default:
[ ]
deployment.targetHost
The target SSH node for deployment.
By default, the node’s attribute name will be used. If set to null, only local deployment will be supported.
Type: null or string
Default:
"nixos"
deployment.targetPort
The target SSH port for deployment.
By default, the port is the standard port (22) or taken from your ssh_config.
Type: null or unsigned integer, meaning >=0
Default:
null
deployment.targetUser
The user to use to log into the remote node. If set to null, the target user will not be specified in SSH invocations.
Type: null or string
Default:
"root"
Meta Options
The following is a list of options that can be added to the meta attribute set.
For compatibility with NixOps, you may name it network instead of meta.
However, you cannot specify both at the same time.
allowApplyAll
Whether to allow deployments without a node filter set.
If set to false, a node filter must be specified with --on when
deploying.
It helps prevent accidental deployments to the entire cluster
when tags are used (e.g., @production and @staging).
Type: boolean
Default:
true
description
A short description for the configuration.
Type: string
Default:
"A Colmena Hive"
machinesFile
Use the machines listed in this file when building this hive configuration.
If your Colmena host has nix configured to allow for remote builds (for nix-daemon, your user being included in trusted-users) you can set a machines file that will be passed to the underlying nix-store command during derivation realization as a builders option. For example, if you support multiple orginizations each with their own build machine(s) you can ensure that builds only take place on your local machine and/or the machines specified in this file.
See https://nixos.org/manual/nix/stable/#chap-distributed-builds for the machine specification format.
This option is ignored when builds are initiated on the remote nodes
themselves via deployment.buildOnTarget or --build-on-target. To
still use the Nix distributed build functionality, configure the
builders on the target nodes with nix.buildMachines.
Type: null or path
Default:
null
name
The name of the configuration.
Type: string
Default:
"hive"
nixpkgs
The pinned Nixpkgs package set. Accepts one of the following:
- A path to a Nixpkgs checkout
- The Nixpkgs lambda (e.g., import <nixpkgs>)
- An initialized Nixpkgs attribute set
This option must be specified when using Flakes.
Type: unspecified value
Default:
null
nodeNixpkgs
Node-specific Nixpkgs pins.
Type: attribute set of unspecified value
Default:
{ }
nodeSpecialArgs
Node-specific special args.
Type: attribute set of unspecified value
Default:
{ }
specialArgs
A set of special arguments to be passed to NixOS modules.
This will be merged into the specialArgs used to evaluate
the NixOS configurations.
Type: attribute set of unspecified value
Default:
{ }
Command Line Options
The following are the help messages that will be printed when you invoke any sub-command with --help:
colmena
NixOS deployment tool Colmena helps you deploy to multiple hosts running NixOS. For more details, read the manual at <https://colmena.cli.rs/0.4>. Usage: colmena [OPTIONS] [COMMAND] Commands: apply Apply configurations on remote machines apply-local Apply configurations on the local machine build Build configurations but not push to remote machines eval Evaluate an expression using the complete configuration upload-keys Upload keys to remote hosts exec Run a command on remote machines repl Start an interactive REPL with the complete configuration nix-info Show information about the current Nix installation help Print this message or the help of the given subcommand(s) Options: --show-trace Passes --show-trace to Nix commands --impure Passes --impure to Nix commands --nix-option <NAME> <VALUE> Passes arbitrary options to Nix commands This only works when building locally. -f, --config <CONFIG> If this argument is not specified, Colmena will search upwards from the current working directory for a file named "flake.nix" or "hive.nix". This behavior is disabled if --config/-f is given explicitly. For a sample configuration, check the manual at <https://colmena.cli.rs/0.4>. [default: hive.nix] -h, --help Print help (see a summary with '-h') -V, --version Print version --color <WHEN> When to colorize the output. By default, Colmena enables colorized output when the terminal supports it. It's also possible to specify the preference using environment variables. See <https://bixense.com/clicolors>. [default: auto] [possible values: auto, always, never]
colmena apply
Apply configurations on remote machines Usage: colmena apply [OPTIONS] [goal] Arguments: [goal] The goal of the deployment. Same as the targets for switch-to-configuration, with the following extra pseudo-goals: - build: Only build the system profiles - push: Only copy the closures to remote nodes - keys: Only upload the keys to the remote nodes `switch` is the default goal unless `--reboot` is passed, in which case `boot` is the default. [default: switch] [possible values: build, push, switch, boot, test, dry-activate, keys] Options: --eval-node-limit <LIMIT> Limits the maximum number of hosts to be evaluated at once. The evaluation process is RAM-intensive. The default behavior is to limit the maximum number of host evaluated at the same time based on naive heuristics. Set to 0 to disable the limit. [default: auto] -p, --parallel <LIMIT> Limits the maximum number of hosts to be deployed in parallel. Set to 0 to disable parallemism limit. [default: 10] --show-trace Passes --show-trace to Nix commands --impure Passes --impure to Nix commands --keep-result Create GC roots for built profiles. The built system profiles will be added as GC roots so that they will not be removed by the garbage collector. The links will be created under .gcroots in the directory the Hive configuration is located. --nix-option <NAME> <VALUE> Passes arbitrary options to Nix commands This only works when building locally. -v, --verbose Deactivates the progress spinner and prints every line of output. --no-keys Do not upload secret keys set in `deployment.keys`. By default, Colmena will upload keys set in `deployment.keys` before deploying the new profile on a node. To upload keys without building or deploying the rest of the configuration, use `colmena upload-keys`. --reboot Reboots nodes after activation and waits for them to come back up. --no-substitute Disables the use of substituters when copying closures to the remote host. --no-gzip Disables the use of gzip when copying closures to the remote host. --build-on-target Build the system profiles on the target nodes themselves. If enabled, the system profiles will be built on the target nodes themselves, not on the host running Colmena itself. This overrides per-node perferences set in `deployment.buildOnTarget`. To temporarily disable remote build on all nodes, use `--no-build-on-target`. --force-replace-unknown-profiles If `deployment.replaceUnknownProfiles` is set for a target, using this switch will treat deployment.replaceUnknownProfiles as though it was set true and perform unknown profile replacement. --evaluator <evaluator> If set to `chunked` (default), evaluation of nodes will happen in batches. If set to `streaming`, the experimental streaming evaluator (nix-eval-jobs) will be used and nodes will be evaluated in parallel. This is an experimental feature. [default: chunked] [possible values: chunked, streaming] --on <NODES> Select a list of nodes to deploy to. The list is comma-separated and globs are supported. To match tags, prepend the filter by @. Valid examples: - host1,host2,host3 - edge-* - edge-*,core-* - @a-tag,@tags-can-have-* -f, --config <CONFIG> If this argument is not specified, Colmena will search upwards from the current working directory for a file named "flake.nix" or "hive.nix". This behavior is disabled if --config/-f is given explicitly. For a sample configuration, check the manual at <https://colmena.cli.rs/0.4>. [default: hive.nix] -h, --help Print help (see a summary with '-h') --color <WHEN> When to colorize the output. By default, Colmena enables colorized output when the terminal supports it. It's also possible to specify the preference using environment variables. See <https://bixense.com/clicolors>. [default: auto] [possible values: auto, always, never]
colmena apply-local
Apply configurations on the local machine Usage: colmena apply-local [OPTIONS] [goal] Arguments: [goal] Same as the targets for switch-to-configuration. "push" is noop in apply-local. [default: switch] [possible values: push, switch, boot, test, dry-activate, keys] Options: --sudo Attempt to escalate privileges if not run as root --show-trace Passes --show-trace to Nix commands -v, --verbose Deactivates the progress spinner and prints every line of output. --impure Passes --impure to Nix commands --no-keys Do not deploy secret keys set in `deployment.keys`. By default, Colmena will deploy keys set in `deployment.keys` before activating the profile on this host. --nix-option <NAME> <VALUE> Passes arbitrary options to Nix commands This only works when building locally. --node <NODE> Override the node name to use -f, --config <CONFIG> If this argument is not specified, Colmena will search upwards from the current working directory for a file named "flake.nix" or "hive.nix". This behavior is disabled if --config/-f is given explicitly. For a sample configuration, check the manual at <https://colmena.cli.rs/0.4>. [default: hive.nix] -h, --help Print help (see a summary with '-h') --color <WHEN> When to colorize the output. By default, Colmena enables colorized output when the terminal supports it. It's also possible to specify the preference using environment variables. See <https://bixense.com/clicolors>. [default: auto] [possible values: auto, always, never]
colmena build
Build configurations but not push to remote machines This subcommand behaves as if you invoked `apply` with the `build` goal. Usage: colmena build [OPTIONS] Options: --eval-node-limit <LIMIT> Limits the maximum number of hosts to be evaluated at once. The evaluation process is RAM-intensive. The default behavior is to limit the maximum number of host evaluated at the same time based on naive heuristics. Set to 0 to disable the limit. [default: auto] -p, --parallel <LIMIT> Limits the maximum number of hosts to be deployed in parallel. Set to 0 to disable parallemism limit. [default: 10] --show-trace Passes --show-trace to Nix commands --impure Passes --impure to Nix commands --keep-result Create GC roots for built profiles. The built system profiles will be added as GC roots so that they will not be removed by the garbage collector. The links will be created under .gcroots in the directory the Hive configuration is located. --nix-option <NAME> <VALUE> Passes arbitrary options to Nix commands This only works when building locally. -v, --verbose Deactivates the progress spinner and prints every line of output. --no-keys Do not upload secret keys set in `deployment.keys`. By default, Colmena will upload keys set in `deployment.keys` before deploying the new profile on a node. To upload keys without building or deploying the rest of the configuration, use `colmena upload-keys`. --reboot Reboots nodes after activation and waits for them to come back up. --no-substitute Disables the use of substituters when copying closures to the remote host. --no-gzip Disables the use of gzip when copying closures to the remote host. --build-on-target Build the system profiles on the target nodes themselves. If enabled, the system profiles will be built on the target nodes themselves, not on the host running Colmena itself. This overrides per-node perferences set in `deployment.buildOnTarget`. To temporarily disable remote build on all nodes, use `--no-build-on-target`. --force-replace-unknown-profiles If `deployment.replaceUnknownProfiles` is set for a target, using this switch will treat deployment.replaceUnknownProfiles as though it was set true and perform unknown profile replacement. --evaluator <evaluator> If set to `chunked` (default), evaluation of nodes will happen in batches. If set to `streaming`, the experimental streaming evaluator (nix-eval-jobs) will be used and nodes will be evaluated in parallel. This is an experimental feature. [default: chunked] [possible values: chunked, streaming] --on <NODES> Select a list of nodes to deploy to. The list is comma-separated and globs are supported. To match tags, prepend the filter by @. Valid examples: - host1,host2,host3 - edge-* - edge-*,core-* - @a-tag,@tags-can-have-* -f, --config <CONFIG> If this argument is not specified, Colmena will search upwards from the current working directory for a file named "flake.nix" or "hive.nix". This behavior is disabled if --config/-f is given explicitly. For a sample configuration, check the manual at <https://colmena.cli.rs/0.4>. [default: hive.nix] -h, --help Print help (see a summary with '-h') --color <WHEN> When to colorize the output. By default, Colmena enables colorized output when the terminal supports it. It's also possible to specify the preference using environment variables. See <https://bixense.com/clicolors>. [default: auto] [possible values: auto, always, never]
colmena upload-keys
Upload keys to remote hosts This subcommand behaves as if you invoked `apply` with the pseudo `keys` goal. Usage: colmena upload-keys [OPTIONS] Options: --eval-node-limit <LIMIT> Limits the maximum number of hosts to be evaluated at once. The evaluation process is RAM-intensive. The default behavior is to limit the maximum number of host evaluated at the same time based on naive heuristics. Set to 0 to disable the limit. [default: auto] -p, --parallel <LIMIT> Limits the maximum number of hosts to be deployed in parallel. Set to 0 to disable parallemism limit. [default: 10] --show-trace Passes --show-trace to Nix commands --impure Passes --impure to Nix commands --keep-result Create GC roots for built profiles. The built system profiles will be added as GC roots so that they will not be removed by the garbage collector. The links will be created under .gcroots in the directory the Hive configuration is located. --nix-option <NAME> <VALUE> Passes arbitrary options to Nix commands This only works when building locally. -v, --verbose Deactivates the progress spinner and prints every line of output. --no-keys Do not upload secret keys set in `deployment.keys`. By default, Colmena will upload keys set in `deployment.keys` before deploying the new profile on a node. To upload keys without building or deploying the rest of the configuration, use `colmena upload-keys`. --reboot Reboots nodes after activation and waits for them to come back up. --no-substitute Disables the use of substituters when copying closures to the remote host. --no-gzip Disables the use of gzip when copying closures to the remote host. --build-on-target Build the system profiles on the target nodes themselves. If enabled, the system profiles will be built on the target nodes themselves, not on the host running Colmena itself. This overrides per-node perferences set in `deployment.buildOnTarget`. To temporarily disable remote build on all nodes, use `--no-build-on-target`. --force-replace-unknown-profiles If `deployment.replaceUnknownProfiles` is set for a target, using this switch will treat deployment.replaceUnknownProfiles as though it was set true and perform unknown profile replacement. --evaluator <evaluator> If set to `chunked` (default), evaluation of nodes will happen in batches. If set to `streaming`, the experimental streaming evaluator (nix-eval-jobs) will be used and nodes will be evaluated in parallel. This is an experimental feature. [default: chunked] [possible values: chunked, streaming] --on <NODES> Select a list of nodes to deploy to. The list is comma-separated and globs are supported. To match tags, prepend the filter by @. Valid examples: - host1,host2,host3 - edge-* - edge-*,core-* - @a-tag,@tags-can-have-* -f, --config <CONFIG> If this argument is not specified, Colmena will search upwards from the current working directory for a file named "flake.nix" or "hive.nix". This behavior is disabled if --config/-f is given explicitly. For a sample configuration, check the manual at <https://colmena.cli.rs/0.4>. [default: hive.nix] -h, --help Print help (see a summary with '-h') --color <WHEN> When to colorize the output. By default, Colmena enables colorized output when the terminal supports it. It's also possible to specify the preference using environment variables. See <https://bixense.com/clicolors>. [default: auto] [possible values: auto, always, never]
colmena eval
Evaluate an expression using the complete configuration Your expression should take an attribute set with keys `pkgs`, `lib` and `nodes` (like a NixOS module) and return a JSON-serializable value. For example, to retrieve the configuration of one node, you may write something like: { nodes, ... }: nodes.node-a.config.networking.hostName Usage: colmena eval [OPTIONS] [FILE] Arguments: [FILE] The .nix file containing the expression Options: -E <EXPRESSION> The Nix expression --instantiate Actually instantiate the expression --show-trace Passes --show-trace to Nix commands --impure Passes --impure to Nix commands --nix-option <NAME> <VALUE> Passes arbitrary options to Nix commands This only works when building locally. -f, --config <CONFIG> If this argument is not specified, Colmena will search upwards from the current working directory for a file named "flake.nix" or "hive.nix". This behavior is disabled if --config/-f is given explicitly. For a sample configuration, check the manual at <https://colmena.cli.rs/0.4>. [default: hive.nix] -h, --help Print help (see a summary with '-h') --color <WHEN> When to colorize the output. By default, Colmena enables colorized output when the terminal supports it. It's also possible to specify the preference using environment variables. See <https://bixense.com/clicolors>. [default: auto] [possible values: auto, always, never]
colmena exec
Run a command on remote machines Usage: colmena exec [OPTIONS] <COMMAND>... Arguments: <COMMAND>... Command to run It's recommended to use -- to separate Colmena options from the command to run. For example: colmena exec --on @routers -- tcpdump -vni any ip[9] == 89 Options: -p, --parallel <LIMIT> Limits the maximum number of hosts to run the command in parallel. In `colmena exec`, the parallelism limit is disabled (0) by default. [default: 0] --show-trace Passes --show-trace to Nix commands -v, --verbose Deactivates the progress spinner and prints every line of output. --impure Passes --impure to Nix commands --on <NODES> Select a list of nodes to deploy to. The list is comma-separated and globs are supported. To match tags, prepend the filter by @. Valid examples: - host1,host2,host3 - edge-* - edge-*,core-* - @a-tag,@tags-can-have-* --nix-option <NAME> <VALUE> Passes arbitrary options to Nix commands This only works when building locally. -f, --config <CONFIG> If this argument is not specified, Colmena will search upwards from the current working directory for a file named "flake.nix" or "hive.nix". This behavior is disabled if --config/-f is given explicitly. For a sample configuration, check the manual at <https://colmena.cli.rs/0.4>. [default: hive.nix] -h, --help Print help (see a summary with '-h') --color <WHEN> When to colorize the output. By default, Colmena enables colorized output when the terminal supports it. It's also possible to specify the preference using environment variables. See <https://bixense.com/clicolors>. [default: auto] [possible values: auto, always, never]
colmena nix-info
Show information about the current Nix installation Usage: colmena nix-info [OPTIONS] Options: --show-trace Passes --show-trace to Nix commands --impure Passes --impure to Nix commands --nix-option <NAME> <VALUE> Passes arbitrary options to Nix commands This only works when building locally. -f, --config <CONFIG> If this argument is not specified, Colmena will search upwards from the current working directory for a file named "flake.nix" or "hive.nix". This behavior is disabled if --config/-f is given explicitly. For a sample configuration, check the manual at <https://colmena.cli.rs/0.4>. [default: hive.nix] -h, --help Print help (see a summary with '-h') --color <WHEN> When to colorize the output. By default, Colmena enables colorized output when the terminal supports it. It's also possible to specify the preference using environment variables. See <https://bixense.com/clicolors>. [default: auto] [possible values: auto, always, never]
colmena repl
Start an interactive REPL with the complete configuration In the REPL, you can inspect the configuration interactively with tab completion. The node configurations are accessible under the `nodes` attribute set. Usage: colmena repl [OPTIONS] Options: --show-trace Passes --show-trace to Nix commands --impure Passes --impure to Nix commands --nix-option <NAME> <VALUE> Passes arbitrary options to Nix commands This only works when building locally. -f, --config <CONFIG> If this argument is not specified, Colmena will search upwards from the current working directory for a file named "flake.nix" or "hive.nix". This behavior is disabled if --config/-f is given explicitly. For a sample configuration, check the manual at <https://colmena.cli.rs/0.4>. [default: hive.nix] -h, --help Print help (see a summary with '-h') --color <WHEN> When to colorize the output. By default, Colmena enables colorized output when the terminal supports it. It's also possible to specify the preference using environment variables. See <https://bixense.com/clicolors>. [default: auto] [possible values: auto, always, never]
Release Notes
Release 0.4.0 (2023/05/14)
- Flake evaluation is now actually pure by default. To enable impure expressions, pass
--impure. --rebootis added to trigger a reboot and wait for the node to come back up.- The target user is no longer explicitly set when
deployment.targetUseris null (#91). - In
apply-local, we now only escalate privileges during activation (#85). - Impure overlays are no longer imported by default if a path is specified in
meta.nixpkgs(#39) - GC roots are now created right after the builds are complete, as opposed to after activation.
- The
meta.allowApplyAlloption has been added. If set to false, deployments without a node filter (--on) are disallowed (#95). - The
--no-substitutesoption under theapplysubcommand has been renamed to--no-substitute(#59). - The
meta.nodeSpecialArgsoption has been added. It allows specifying node-specificspecialArgspassed to NixOS modules (#100). - The
replsubcommand has been added. It allows you to start an interactive REPL with access to the complete node configurations. - The default goal for
colmena applyis nowbootif--rebootis specified, andswitchotherwise (#113). - Post-activation keys are now uploaded after the reboot if
--rebootis specified (#113). - Flake-enabled deployments now use the new SSH store protocol (
ssh-ng://).
Release 0.3.2 (2022/09/29)
- Fixed: Key services were using the deprecated
inotifyToolsalias removed fromnixos-unstable(NixOS/nixpkgs#192681).
Release 0.3.1 (2022/08/18)
- Fixed: Streaming evaluation fails for node names containing periods (#92)
- Fixed: Streaming evaluation fails in non-flake deployments with relative paths (#107)
- Fixed:
colmena apply-localreturning non-zero exit code when successful (#111)
Release 0.3.0 (2022/04/27)
- Remote builds are now supported (#33).
- Streaming evaluation powered by nix-eval-jobs is now available as an experimental feature (
--evaluator streaming). - Colmena can now run on macOS to deploy to NixOS hosts using remote building.
- It's now possible to configure output colorization via the CLI and environment variables. Colmena follows the clicolors standard.
- A systemd unit (
${name}-key.service) is now created for each secret file deployed usingdeployment.keys(#48). - Node enumeration is now faster if you do not filter against tags with
--on @tag-name. - The main deployment logic has been rewritten to be cleaner and easier to follow.
- There are now end-to-end tests to ensure that the development branch is actually functional as a whole at all times.
Release 0.2.2 (2022/03/08)
This bugfix release fixes NixOS detection so apply-local works with the latest changes in nixos-unstable (#63). Additionally, --no-keys was fixed in apply-local.
Release 0.2.1 (2022/01/26)
This bugfix release fixes the issue (#50) where sandboxed documentation builds fail when using the unstable Nixpkgs channel.
Release 0.2.0 (2021/11/18)
This is release 0.2.0, the first stable release of Colmena!
Colmena is a simple, stateless NixOS deployment tool modeled after NixOps and morph, built from the ground up to support parallel deployments.
This release contains the following features:
- Node Tagging
- Local Deployment
- Secrets
- Ad Hoc Evaluation
- Nix Flakes Support
- Parallelism
We now have a User Manual at https://colmena.cli.rs/0.2 containing tutorials, sample configurations as well as a complete listing of supported deployment options.
Contributing
Contributions are welcome!
Code
You can checkout the source code and submit pull requests at the GitHub repo.
By contributing code to Colmena, you agree that your contributions will be available under the MIT License.
Issues & Feature Requests
Bumped into a problem? We would like to fix it! Please open a new issue at the GitHub repo.