Nomad

出自Gea-Suan Lin's Wiki
於 2022年6月25日 (六) 14:39 由 Gslin留言 | 貢獻 所做的修訂 →‎安裝
(差異) ←上個修訂 | 最新修訂 (差異) | 下個修訂→ (差異)
跳至導覽 跳至搜尋

NomadHashiCorp推出的資源管理軟體。

架構

Nomad分成Server與Client架構:

  • Server負責協調與分配工作。
  • Client負責實際執行工作。

正式環境下Server建議至少三台機器,Client建議至少兩台機器。

安裝

Nomad server與Nomad client的安裝都相同(透過設定扮演不同的角色),這邊是安裝官方的apt repository:

curl https://apt.releases.hashicorp.com/gpg | sudo apt-key add -; sudo apt-add-repository "deb https://apt.releases.hashicorp.com $(lsb_release -cs) main"; sudo apt update && sudo apt install -y nomad

Nomad client建議再安裝Docker

設定

測試環境

單機同時跑server與client:

#
bind_addr = "0.0.0.0"
data_dir = "/opt/nomad/data"

client {
  enabled = true
  network_interface = "{{ Interfaces | limit 1 }}"
}

server {
  bootstrap_expect = 1
  enabled = true
}

正式環境

Nomad server的部份,依照官方的建議放到/etc/nomad.d/server.hcl

datacenter = "us-east-1a"
data_dir = "/srv/nomad"
enable_syslog = true
log_level = "INFO"
region = "us-east-1"
server {
    enabled = true
    bootstrap_expect = 3
    server_join {
        retry_join = ["10.1.1.10:4648", "10.1.1.11:4648", "10.1.1.12:4648"]
    }
}

Nomad client的部份,依照官方的建議放到/etc/nomad.d/client.hcl

datacenter = "us-east-1a"
data_dir = "/srv/nomad"
enable_syslog = true
log_level = "INFO"
region = "us-east-1"
client {
    enabled = true
    servers = ["10.1.1.10:4648", "10.1.1.11:4648", "10.1.1.12:4648"]

    chroot_env {
        "/bin" = "/bin"
        "/etc" = "/etc"
        "/lib32" = "/lib32"
        "/lib64" = "/lib64"
        "/lib" = "/lib"
        "/run/resolveconf" = "/run/resolveconf"
        "/run/systemd/resolve" = "/run/systemd/resolve"
        "/sbin" = "/sbin"
        "/usr" = "/usr"
    }
}
ports {
    http = 5656
}

設定完成後(無論是server或是client)都可以啟用:

sudo service nomad restart
sudo service nomad status

檔案

一份example.nomad檔案:

job "example" {
  datacenters = ["us-east-1a", "us-east-1b", "us-east-1c"]
  type = "batch"
  group "example" {
    count = 10
    task "example" {
      driver = "exec"
      config {
        command = "/usr/bin/curl"
        args = ["https://wiki.gslin.org/robots.txt"]
      }
    }
  }
}

常用指令

目前測試的情況下,所有的指令都接受NOMAD_ADDR環境變數。如果沒有設定環境的話,需要在命令列加上-address=http://a.b.c.d:4646參數:

export NOMAD_ADDR=http://nomad-server:4646

操作類性指令:

nomad alloc status <id>
nomad alloc logs <id>
nomad server members
nomad node status
nomad job run example.nomad
nomad job status
nomad job stop example

外部連結