85 lines
2.2 KiB
Markdown
85 lines
2.2 KiB
Markdown
---
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title: "Hut"
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description: "Control node"
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date: 2023-06-13T19:36:57+02:00
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---
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From the hut we monitor and control other nodes. It consist of one node only,
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which is available at `hut` or `xeon07`. It runs the following services:
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- Prometheus: to store the monitoring data.
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- Grafana: to plot the data in the web browser.
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- Slurmctld: to manage the SLURM nodes.
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- Gitlab runner: to run CI jobs from Gitlab.
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- Nix binary cache: to serve cached nix builds
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This node is prone to interruptions from all the services it runs, so it is not
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a good candidate for low noise executions.
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# Binary cache
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We provide a binary cache in `hut`, with the aim of avoiding unnecessary
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recompilation of packages.
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The cache should contain common packages from bsckpkgs, but we don't provide
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any guarantee that of what will be available in the cache, or for how long.
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We recommend following the latest version of the `jungle` flake to avoid cache
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misses.
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## Usage
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### From NixOS
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In NixOS, we can add the cache through the `nix.settings` option, which will
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enable it for all builds in the system.
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```nix
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{ ... }: {
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nix.settings = {
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substituters = [ "https://jungle.bsc.es" ];
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trusted-public-keys = [ "jungle.bsc.es:pEc7MlAT0HEwLQYPtpkPLwRsGf80ZI26aj29zMw/HH0=" ];
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};
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}
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```
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### Interactively
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The cache can also be specified in a per-command basis through the flags
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`--substituters` and `--trusted-public-keys`:
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```sh
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nix build --substituters "https://jungle.bsc.es/cache" --trusted-public-keys "jungle.bsc.es:pEc7MlAT0HEwLQYPtpkPLwRsGf80ZI26aj29zMw/HH0=" <...>
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```
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### Nix configuration file (non-nixos)
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If using nix outside of NixOS, you'll have to update `nix.conf`
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```bash
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echo "substituters = https://jungle.bsc.es" >> /etc/nix/nix.conf
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echo "trusted-public-keys = jungle.bsc.es:pEc7MlAT0HEwLQYPtpkPLwRsGf80ZI26aj29zMw/HH0=" >> /etc/nix/nix.conf
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```
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### Hint in flakes
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By adding the configuration below to a `flake.nix`, when someone uses the flake,
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`nix` will interactively ask to trust and use the provided binary cache:
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```nix
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{
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nixConfig = {
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extra-substituters = [
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"https://jungle.bsc.es/cache"
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];
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extra-trusted-public-keys = [
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"jungle.bsc.es:pEc7MlAT0HEwLQYPtpkPLwRsGf80ZI26aj29zMw/HH0="
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];
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};
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outputs = { ... }: {
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...
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};
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}
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```
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