liminix

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default.nix (1388B)

      1 ## Health check
      2 ##
      3 ## Runs a service and a separate periodic health process. When the
      4 ## health check starts failing over a period of time, kill the service.
      5 ## (Usually that means the supervisor will restart it, but you can
      6 ## have other behaviours by e.g. combining this service with a round-robin
      7 ## for failover)
      8 
      9 {
     10   lib,
     11   pkgs,
     12   config,
     13   ...
     14 }:
     15 let
     16   inherit (lib) mkOption types;
     17   inherit (pkgs) liminix;
     18 in
     19 #  inherit (pkgs.liminix.services) longrun;
     20 {
     21   options = {
     22     system.service.health-check = mkOption {
     23       description = "run a service while periodically checking it is healthy";
     24       type = liminix.lib.types.serviceDefn;
     25     };
     26   };
     27   config.system.service.health-check = config.system.callService ./service.nix {
     28     service = mkOption {
     29       type = liminix.lib.types.service;
     30     };
     31     interval = mkOption {
     32       description = "interval between checks, in seconds";
     33       type = types.int;
     34       default = 10;
     35       example = 10;
     36     };
     37     threshold = mkOption {
     38       description = "number of consecutive failures required for the service to be kicked";
     39       type = types.int;
     40       example = 3;
     41     };
     42     healthCheck = mkOption {
     43       description = "health check command or script. Expected to exit 0 if the service is healthy or any other exit status otherwise";
     44       type = types.path;
     45     };
     46   };
     47   config.programs.busybox.applets = [ "expr" ];
     48 }