30 lines
1 KiB
Markdown
30 lines
1 KiB
Markdown
---
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title: How to use a non-default ssh port for a Nix distributed build host
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date: 2022-11-01
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tags: [nix]
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---
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I wanted to host my ssh server on a different port than the default `22`, this allows me to skip on some spam in the logs, as the default port gets scanned quite often.
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By changing that on the server I broke distributing my nix builds, as they were using the default port as well.
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It took me a while to figure out how to configure the port the builder would use so I thought I would share here.
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Here's an example of a *client-side* configuration - using a build server `buildHostName` with a user named `nix-builder`, connecting via ssh to port `1234`.
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```nix
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programs.ssh.extraConfig = ''
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Host buildHostName
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HostName buildHostName
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Port 1234
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StrictHostKeyChecking=accept-new
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'';
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nix.buildMachines = [{
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hostName = "buildHostName";
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sshUser = "nix-builder";
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sshKey = "/path/to/key";
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systems = [ "x86_64-linux" ];
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maxJobs = 2;
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speedFactor = 2;
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supportedFeatures = [ "kvm" ];
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mandatoryFeatures = [ ];
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}];
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```
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