a12d7e1115
Nixpkgs now includes Colmena starting with 21.11 and is now the preferred method to obtain Colmena. The `stable` branch will continue to be updated for each stable release. Fixes #41.
206 lines
6.9 KiB
Markdown
206 lines
6.9 KiB
Markdown
# Colmena
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[](https://zhaofengli.github.io/colmena/stable)
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[](https://zhaofengli.github.io/colmena/unstable)
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[](https://github.com/zhaofengli/colmena/actions/workflows/build.yml)
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Colmena is a simple, stateless [NixOS](https://nixos.org) deployment tool modeled after [NixOps](https://github.com/NixOS/nixops) and [morph](https://github.com/DBCDK/morph), written in Rust.
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It's a thin wrapper over Nix commands like `nix-instantiate` and `nix-copy-closure`, and supports parallel deployment.
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Now with 100% more flakes! See *Tutorial with Flakes* below.
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<pre>
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$ <b>colmena apply --on @tag-a</b>
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[INFO ] Enumerating nodes...
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[INFO ] Selected 7 out of 45 hosts.
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(...) ✅ 0s Build successful
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<b>sigma</b> 🕗 7s copying path '/nix/store/h6qpk8rwm3dh3zsl1wlj1jharzf8aw9f-unit-haigha-agent.service' to 'ssh://root@sigma.redacted'...
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<b>theta</b> ✅ 7s Activation successful
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<b>gamma</b> 🕘 8s Starting...
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<b>alpha</b> ✅ 1s Activation successful
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<b>epsilon</b> 🕗 7s copying path '/nix/store/fhh4rfixny8b21l6jqzk7nqwxva5k20h-nixos-system-epsilon-20.09pre-git' to 'ssh://root@epsilon.redacted'...
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<b>beta</b> 🕗 7s removing obsolete file /boot/kernels/z28ayg10kpnlrz0s2qrb9pzv82lc20s2-initrd-linux-5.4.89-initrd
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<b>kappa</b> ✅ 2s Activation successful
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</pre>
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## Installation
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`colmena` is included in Nixpkgs beginning with 21.11.
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Use the following command to enter a shell environment with the `colmena` command:
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```bash
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nix-shell -p colmena
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```
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### Unstable Version
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To install the latest development version to your user profile:
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```bash
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nix-env -if https://github.com/zhaofengli/colmena/tarball/main
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```
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Alternatively, if you have a local clone of the repo:
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```bash
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nix-env -if default.nix
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```
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A public binary cache is available at https://colmena.cachix.org, courtesy of Cachix.
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This binary cache contains unstable versions of Colmena built by [GitHub Actions](https://github.com/zhaofengli/colmena/actions).
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## Tutorial
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*See Tutorial with Flakes for usage with Nix Flakes.*
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Colmena should work with your existing NixOps and morph configurations with minimal modification.
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Here is a sample `hive.nix` with two nodes, with some common configurations applied to both nodes:
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```nix
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{
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meta = {
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# Override to pin the Nixpkgs version (recommended). This option
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# accepts one of the following:
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# - A path to a Nixpkgs checkout
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# - The Nixpkgs lambda (e.g., import <nixpkgs>)
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# - An initialized Nixpkgs attribute set
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nixpkgs = <nixpkgs>;
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# You can also override Nixpkgs by node!
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nodeNixpkgs = {
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node-b = ./another-nixos-checkout;
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};
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# If your Colmena host has nix configured to allow for remote builds
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# (for nix-daemon, your user being included in trusted-users)
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# you can set a machines file that will be passed to the underlying
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# nix-store command during derivation realization as a builders option.
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# For example, if you support multiple orginizations each with their own
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# build machine(s) you can ensure that builds only take place on your
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# local machine and/or the machines specified in this file.
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# machinesFile = ./machines.client-a;
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};
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defaults = { pkgs, ... }: {
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# This module will be imported by all hosts
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environment.systemPackages = with pkgs; [
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vim wget curl
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];
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# By default, Colmena will replace unknown remote profile
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# (unknown means the profile isn't in the nix store on the
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# host running Colmena) during apply (with the default goal,
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# boot, and switch).
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# If you share a hive with others, or use multiple machines,
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# and are not careful to always commit/push/pull changes
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# you can accidentaly overwrite a remote profile so in those
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# scenarios you might want to change this default to false.
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# deployment.replaceUnknownProfiles = true;
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};
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host-a = { name, nodes, ... }: {
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# The name and nodes parameters are supported in Colmena,
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# allowing you to reference configurations in other nodes.
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networking.hostName = name;
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time.timeZone = nodes.host-b.config.time.timeZone;
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boot.loader.grub.device = "/dev/sda";
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fileSystems."/" = {
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device = "/dev/sda1";
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fsType = "ext4";
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};
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};
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host-b = {
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# Like NixOps and morph, Colmena will attempt to connect to
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# the remote host using the attribute name by default. You
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# can override it like:
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deployment.targetHost = "host-b.mydomain.tld";
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# It's also possible to override the target SSH port.
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# For further customization, use the SSH_CONFIG_FILE
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# environment variable to specify a ssh_config file.
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deployment.targetPort = 1234;
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# Override the default for this target host
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deployment.replaceUnknownProfiles = false;
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# You can filter hosts by tags with --on @tag-a,@tag-b.
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# In this example, you can deploy to hosts with the "web" tag using:
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# colmena apply --on @web
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# You can use globs in tag matching as well:
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# colmena apply --on '@infra-*'
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deployment.tags = [ "web" "infra-lax" ];
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time.timeZone = "America/Los_Angeles";
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boot.loader.grub.device = "/dev/sda";
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fileSystems."/" = {
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device = "/dev/sda1";
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fsType = "ext4";
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};
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};
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}
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```
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The full set of options can be found in [the manual](https://zhaofengli.github.io/colmena/unstable/reference).
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Run `colmena build` in the same directory to build the configuration, or do `colmena apply` to build and deploy it to all nodes.
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## Tutorial with Flakes
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To use with Nix Flakes, create `outputs.colmena` in your `flake.nix`.
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Here is a short example:
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```nix
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{
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inputs = {
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nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
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};
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outputs = { nixpkgs, ... }: {
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colmena = {
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meta = {
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nixpkgs = import nixpkgs {
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system = "x86_64-linux";
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};
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};
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# Also see the non-Flakes hive.nix example above.
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host-a = { name, nodes, pkgs, ... }: {
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boot.isContainer = true;
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time.timeZone = nodes.host-b.config.time.timeZone;
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};
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host-b = {
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deployment = {
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targetHost = "somehost.tld";
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targetPort = 1234;
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targetUser = "luser";
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};
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boot.isContainer = true;
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time.timeZone = "America/Los_Angeles";
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};
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};
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};
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}
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```
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The full set of options can be found in [the manual](https://zhaofengli.github.io/colmena/unstable/reference).
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Run `colmena build` in the same directory to build the configuration, or do `colmena apply` to build and deploy it to all nodes.
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## Manual
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Read [the Colmena Manual](https://zhaofengli.github.io/colmena).
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## Environment Variables
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- `SSH_CONFIG_FILE`: Path to a `ssh_config` file
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## Current Limitations
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- It's required to use SSH keys to log into the remote hosts, and interactive authentication will not work.
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- Error reporting is lacking.
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## Licensing
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Colmena is available under the MIT License.
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