loki.nomad

variable "loki_version" {
  type    = string
  default = "v2.7.5"
}

job "loki" {
  datacenters = ["dc1"]
  type        = "service"
  name        = "loki"
  priority    = 80
  meta {
    auto-backup      = true
    backup-schedule  = "@hourly"
    backup-target-db = "postgres"
  }

  update {
    max_parallel      = 2
    health_check      = "checks"
    min_healthy_time  = "5s"
    healthy_deadline  = "300s"
    progress_deadline = "10m"
    auto_revert       = true
    auto_promote      = true
    canary            = 1
  }

  reschedule {
    interval       = "30m"
    delay          = "30s"
    delay_function = "exponential"
    max_delay      = "1200s"
    unlimited      = true
  }

  migrate {
    max_parallel     = 2
    health_check     = "checks"
    min_healthy_time = "10s"
    healthy_deadline = "5m"
  }

  group "log-server" {
    count = 1

    network {
      port "http" {}
      port "grpc" {}
    }
    service {
      name      = "loki-http-server"
      tags      = ["urlprefix-/loki strip=/loki"]
      port      = "http"
      on_update = "require_healthy"

      check {
        name     = "loki_ready"
        type     = "http"
        path     = "/ready"
        port     = "http"
        interval = "10s"
        timeout  = "3s"
      }
    }

    service {
      name = "loki-grpc"
      port = "grpc"
    }

    task "server" {
      driver = "exec"
      vault {
        // policies      = ["read-only"]
        change_mode   = "signal"
        change_signal = "SIGHUP"
      }
      config {
        command = "loki"
        args = [
          "-config.file=local/loki.yml"
        ]
      }
      resources {
        cpu    = 1000
        memory = 200
      }
      template {
        data        = file("loki.yml.tpl")
        destination = "local/loki.yml"
        change_mode = "restart"
      }
      artifact {
        source = "https://github.com/grafana/loki/releases/download/${var.loki_version}/loki-linux-${attr.cpu.arch}.zip"
        options { # checksum depends on the cpu arch
        }
        destination = "local/loki"
        mode        = "file"
      }
    }
  }
}