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如何设置 ansible playbook 来重新启动服务器

tag-icon • tag-icon linux reboot ansible jenkins
如何设置 ansible playbook 来重新启动服务器

我希望能够编写一本剧本来更新不同环境（阶段和产品）中的所有服务器。我不想每次内核更新时都重新启动这些服务器，我只想每两个月重新启动一次。

有没有办法将重新启动变量传递给 ansible 命令，以仅在我想要重新启动时触发所有服务器的重新启动？

我将使用 Jenkins 来触发更新作业。

示例代码如下：

- hosts: all
  become: yes
  tasks:  
    - name: Making changes to the yum.conf file
      shell: sudo sed "s/exclude=kernel/#exclude=kernel/g" /etc/yum.conf
      args:
        executable: /bin/bash

    - name: Performing yum update
      yum:
        update_cache: yes
        name: '*'
        state: latest
        update_cache: yes

    - name: Checking for reboot
      shell: LAST_KERNEL=$(rpm -q --last kernel | awk 'NR==1{sub(/kernel-/,""); print $1}'); CURRENT_KERNEL=$(uname -r); if [ $LAST_KERNEL != $CURRENT_KERNEL ]; then echo 'reboot'; else echo 'no'; fi
      ignore_errors: true
      register: reboot_hint

    - name: Rebooting servers now ...
      command: shutdown -r now "Reboot required for updated kernel"
      async: 0
      poll: 0
      sudo: true
      ignore_errors: true
      when: reboot_hint.stdout.find("reboot") != -1
      register: rebooting

    - name: Taking a nap while servers reboot...
      pause: seconds=200
      when: rebooting is changed

    - name: Confirming servers are back online
      wait_for:
        host: "{{ ansible_ssh_host | default(inventory_hostname) }}"
        delay: 30
        state: started
        search_regex: OpenSSH
        port: 22
      become: false
      when: reboot is changed
      delegate_to: localhost

答案1

您可以通过运行将额外的变量传递给 ansible playbooks

ansible-playbook --limit whatever myplaybook.yml --extra-vars reboot=now

修改剧本的顶部：

- hosts: all
  become: yes
  vars:
    reboot: notnow

重启任务变为：

- name: Rebooting servers now ...
  command: shutdown -r now "Reboot required for updated kernel"
  async: 0
  poll: 0
  sudo: true
  ignore_errors: true
  when: reboot == "now"
  register: rebooting

当您不传递 extra-vars 参数时，var 的值为“notnow”，然后when条件将不会得到满足。

答案2

现在有一个模块可以简单地重新启动机器：https://docs.ansible.com/ansible/latest/modules/reboot_module.html

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