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
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 [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
1 2 3 4 5 6 7 8 9 10 11 12 13 14 [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：
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 [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！
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 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
1 2 3 4 5 6 7 8 9 10 11 12 13 14 [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
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 [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
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 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" ] } ] } }
