Ansible register注册变量

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Ansible register注册变量

有时候，task中的脚本或命令输出需要回传其结果，此时就可以使用register来注册结果为一个变量，配置debug在下一个task中输出结果。从这里也可以看出register注册的变量可以被该task后的任意task使用，从而实现task间的变量传递

register基本样例

使用shell获取bash的version

没有使用register时

[root@manager project]# cat test-shell.yaml
---
 - hosts: node
   remote_user: root
   tasks:
     - name: Get bash version
       shell: rpm -qa bash
       args:
         warn: no

[root@manager project]# ansible-playbook -i hosts test-shell.yaml

PLAY [node] *************************************************************************************************************************************************

TASK [Gathering Facts] **************************************************************************************************************************************
ok: [10.100.235.196]
ok: [10.100.235.221]
ok: [10.100.235.222]

TASK [Get bash version] *************************************************************************************************************************************
changed: [10.100.235.222]
changed: [10.100.235.196]
changed: [10.100.235.221]

PLAY RECAP **************************************************************************************************************************************************
10.100.235.196             : ok=2    changed=1    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0
10.100.235.221             : ok=2    changed=1    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0
10.100.235.222             : ok=2    changed=1    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0

增加register注册变量，以及多一个debug输出

[root@manager project]# cat test-shell.yaml
---
 - hosts: node
   remote_user: root
   tasks:
   - name: Get bash version
     shell: rpm -qa bash
     args:
       warn: no
     register: bash_version

   - name: Out put bash_version
     debug:
       msg: "{{ bash_version }}"

此时运行playbook的输出：

[root@manager project]# ansible-playbook -i hosts test-shell.yaml

PLAY [node] *************************************************************************************************************************************************

TASK [Gathering Facts] **************************************************************************************************************************************
ok: [10.100.235.196]
ok: [10.100.235.222]
ok: [10.100.235.221]

TASK [Get bash version] *************************************************************************************************************************************
changed: [10.100.235.222]
changed: [10.100.235.221]
changed: [10.100.235.196]

TASK [Out put bash_version] *********************************************************************************************************************************
ok: [10.100.235.221] => {
    "msg": {
        "changed": true,
        "cmd": "rpm -qa bash",
        "delta": "0:00:00.991182",
        "end": "2019-03-21 13:51:25.902800",
        "failed": false,
        "rc": 0,
        "start": "2019-03-21 13:51:24.911618",
        "stderr": "",
        "stderr_lines": [],
        "stdout": "bash-4.2.46-31.el7.x86_64",
        "stdout_lines": [
            "bash-4.2.46-31.el7.x86_64"
        ]
    }
}
ok: [10.100.235.196] => {
    "msg": {
        "changed": true,
        "cmd": "rpm -qa bash",
        "delta": "0:00:00.993291",
        "end": "2019-03-21 13:51:25.903275",
        "failed": false,
        "rc": 0,
        "start": "2019-03-21 13:51:24.909984",
        "stderr": "",
        "stderr_lines": [],
        "stdout": "bash-4.2.46-31.el7.x86_64",
        "stdout_lines": [
            "bash-4.2.46-31.el7.x86_64"
        ]
    }
}
ok: [10.100.235.222] => {
    "msg": {
        "changed": true,
        "cmd": "rpm -qa bash",
        "delta": "0:00:00.988145",
        "end": "2019-03-21 13:51:25.896126",
        "failed": false,
        "rc": 0,
        "start": "2019-03-21 13:51:24.907981",
        "stderr": "",
        "stderr_lines": [],
        "stdout": "bash-4.2.46-31.el7.x86_64",
        "stdout_lines": [
            "bash-4.2.46-31.el7.x86_64"
        ]
    }
}

PLAY RECAP **************************************************************************************************************************************************
10.100.235.196             : ok=3    changed=1    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0
10.100.235.221             : ok=3    changed=1    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0
10.100.235.222             : ok=3    changed=1    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0

可以看到register注册的bash_version似乎不仅仅只是命令的执行输出，而是该task的执行信息，而该信息中的stdout中才是我们shell模块的执行结果！

ok: [10.100.235.221] => {
    "msg": {
        "changed": true,                        # 变化状态，shell永远都是true
        "cmd": "rpm -qa bash",                  # 执行的命令
        "delta": "0:00:00.991182",
        "end": "2019-03-21 13:51:25.902800",    # task结束时间
        "failed": false,                        # 运行状态是否失败               
        "rc": 0,                                # return code, 0则为task运行成功
        "start": "2019-03-21 13:51:24.911618",  # task开始时间
        "stderr": "",                           # 标准错误输出
        "stderr_lines": [],
        "stdout": "bash-4.2.46-31.el7.x86_64",  # 标准输出
        "stdout_lines": [
            "bash-4.2.46-31.el7.x86_64"
        ]
    }
}

上面有很多信息我们不需要，我们只需要stdout，则可以这样写

[root@manager project]# cat test-shell.yaml
---
 - hosts: node
   remote_user: root
   tasks:
   - name: Get bash version
     shell: rpm -qa bash
     args:
       warn: no
     register: get_bash_version_info

   - name: Out put get_bash_version_info.stdout
     debug:
       msg: "{{ get_bash_version_info.stdout }}"

最终运行结果

[root@manager project]# ansible-playbook -i hosts test-shell.yaml

PLAY [node] *************************************************************************************************************************************************

TASK [Gathering Facts] **************************************************************************************************************************************
ok: [10.100.235.221]
ok: [10.100.235.196]
ok: [10.100.235.222]

TASK [Get bash version] *************************************************************************************************************************************
changed: [10.100.235.222]
changed: [10.100.235.196]
changed: [10.100.235.221]

TASK [Out put get_bash_version_info.stdout] *****************************************************************************************************************
ok: [10.100.235.221] => {
    "msg": "bash-4.2.46-31.el7.x86_64"
}
ok: [10.100.235.196] => {
    "msg": "bash-4.2.46-31.el7.x86_64"
}
ok: [10.100.235.222] => {
    "msg": "bash-4.2.46-31.el7.x86_64"
}

PLAY RECAP **************************************************************************************************************************************************
10.100.235.196             : ok=3    changed=1    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0
10.100.235.221             : ok=3    changed=1    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0
10.100.235.222             : ok=3    changed=1    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0

注意：不是所有task输出都有stdout，不同模块的task执行的输出信息可能不同，所以一般都编写playbook任务会用register先注册整个任务的输出情况，在认为锁定需要的字段，比如下边的yum模块的task输出

TASK [Out put get_yum_install_cronie_info] ******************************************************************************************************************
ok: [10.100.235.221] => {
    "msg": {
        "changed": false,
        "msg": "All items completed",
        "results": [
            {
                "ansible_loop_var": "item",
                "changed": false,
                "failed": false,
                "invocation": {
                    "module_args": {
                        "allow_downgrade": false,
                        "autoremove": false,
                        "bugfix": false,
                        "conf_file": null,
                        "disable_excludes": null,
                        "disable_gpg_check": false,
                        "disable_plugin": [],
                        "disablerepo": [],
                        "download_dir": null,
                        "download_only": false,
                        "enable_plugin": [],
                        "enablerepo": [],
                        "exclude": [],
                        "install_repoquery": true,
                        "install_weak_deps": true,
                        "installroot": "/",
                        "list": null,
                        "lock_timeout": 30,
                        "name": [
                            "cronie"
                        ],
                        "releasever": null,
                        "security": false,
                        "skip_broken": false,
                        "state": "present",
                        "update_cache": false,
                        "update_only": false,
                        "use_backend": "auto",
                        "validate_certs": true
                    }
                },
                "item": [
                    "cronie"
                ],
                "msg": "",
                "rc": 0,
                "results": [
                    "cronie-1.4.11-24.el7_9.x86_64 providing cronie is already installed"
                ]
            }
        ]
    }
}

正文完
ansible devops
发表至： Ansible DevOps
2019-03-21
 
xadocker
版权声明：本站原创文章，由 xadocker 2019-03-21发表，共计6805字。
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