如何使ansible等待端口准备好?

时间:2018-03-07 16:47:13

标签: ansible

我打算等待一个端口准备好如此使用" wait_for"

- name: Wait for service to be ready
  wait_for:
    host: 192.168.1.70
    port: 8080

然而它只等待300秒然后失败。

TASK [Wait for service to be ready] 
fatal: [localhost]: FAILED! => {"changed": false, "elapsed": 300, "msg": "Timeout when waiting for 192.168.1.70:8080"}

所以,我添加了一个"直到" :

- name: Wait for service to be ready
  wait_for:
    host: 192.168.1.70
    port: 8080
  register: port8080
  until: port8080.failed == "false"

相反,我收到错误:

TASK [Wait for ssh to be ready] 
fatal: [localhost]: FAILED! => {"msg": "The conditional check 'port8080.failed == \"false\"' failed. The error was: error while evaluating conditional (port8080.failed == \"false\"): 'dict object' has no attribute 'failed'"}

但如果我删除"直到"并添加一个调试语句,我可以看到 port8080.failed 按预期设置为true或false。

TASK [debug] ****************************************************************************************************************************
ok: [localhost] => {
  "port8080": {
     "changed": false, 
     "elapsed": 0, 
     "failed": false, 

第一个问题:这是一个安全的错误还是我做错了什么? 第二个问题:如何让我的脚本等待连接(超过300秒)?

(NB我实际上正在等待数据库启动,数据库启动300秒的时间太短。但我不想等待300秒,以防万一。 - 运行脚本并且DB已经在运行。)

1 个答案:

答案 0 :(得分:3)

尝试wait_for_connection例如,当您重新启动系统并希望等到可达/可用时,这将起作用:

- name: Something that may reboot
  shell: echo "true"
  register: should_reboot

- name: Rebooting ...
  shell: sleep 2 && /sbin/shutdown -r now "Reboot required"
  async: 1
  poll: 0
  ignore_errors: true
  register: rebooting
  when: should_reboot.stdout == "true"

- name: Wait for rebooted servers to come back
  wait_for_connection:
    connect_timeout: 20
    sleep: 5
    delay: 5
    timeout: 60
  when: rebooting|changed

如果检查/测试远程主机是否已启动,则可能有效:

- name: Wait for service to be ready
  wait_for:
    port: 8080
    host: 127.0.0.1
    connect_timeout: 3
    delay: 3
    timeout: 30

为了测试,我使用netcat创建了一个本地端口8080,例如:

nc -l 8080

如果端口没有打开,你会得到类似的东西:

fatal: [localhost]: FAILED! => {"changed": false, "elapsed": 30, "msg": "Timeout when waiting for localhost:8080"}

当端口打开时你运行playybook会注意到连接它的人也会退出,如果你想保持它永久使用的话:

nc -kl 8080