44 lines
1.3 KiB
Nix
44 lines
1.3 KiB
Nix
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## Health check
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##
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## Runs a service and a separate periodic health process. When the
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## health check starts failing over a period of time, kill the service.
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## (Usually that means the supervisor will restart it, but you can
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## have other behaviours by e.g. combining this service with a round-robin
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## for failover)
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{ lib, pkgs, config, ...}:
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let
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inherit (lib) mkOption types;
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inherit (pkgs) liminix;
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# inherit (pkgs.liminix.services) longrun;
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in {
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options = {
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system.service.health-check = mkOption {
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description = "run a service while periodically checking it is healthy";
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type = liminix.lib.types.serviceDefn;
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};
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};
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config.system.service.health-check = config.system.callService ./service.nix {
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service = mkOption {
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type = liminix.lib.types.service;
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};
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interval = mkOption {
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description = "interval between checks, in seconds";
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type = types.int;
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default = 10;
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example = 10;
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};
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threshold = mkOption {
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description = "number of consecutive failures required for the service to be kicked";
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type = types.int;
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example = 3;
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};
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healthCheck = mkOption {
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description = "health check command or script. Expected to exit 0 if the service is healthy or any other exit status otherwise";
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type = types.path;
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};
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};
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config.programs.busybox.applets = ["expr"];
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}
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