Ansible playbook 執行流程
背景
超時主要分兩個場景，一個是建立 SSH 連線時，另外一個為通過 SSH 執行命令時的超時。前者主要依靠 SSH 命令的自帶引數 ConnectTimeout，後者則有一套 Ansible 自己的實現。
建立連線超時
ansible 2 -u root -m ping -T 30。底層實現使用 ssh -o ConnectTimeout=30。
執行命令超時（playbook）
在 playbook 的 task 中加入 async 和 poll 屬性。
async表示這個step的最長等待時長, 如果設定為0, 表示一直等待下去直到動作完成；poll表示檢查step操作結果的間隔時長，poll 設定為0, 表示不用等待執行結果, 該step執行成功。
測試用的 playbook 如下：
---
- hosts: "1"
vars:
http_port: 80
max_clients: 200
remote_user: root
tasks:
- name: Sleep30s
shell:
"sleep 30s"
async: 10
poll: 1
啟動命令如下：
ansible-playbook pb.yml
效果：
執行命令超時（playbook）的流程
在此 playbook 中，有一個 task，但是在執行上面定義的 task 之前，會執行一個 Gathering Facts 的 task，這裡將此不太相干的 task 去掉了。task Sleep30s 的執行日誌如下：
TASK [Sleep30s] ****************************************************************
task path: /Users/yangyu/pb.yml:8
<9.134.124.159> ESTABLISH SSH CONNECTION FOR USER: root
<9.134.124.159> SSH: EXEC ssh -C -o ControlMaster=auto -o ControlPersist=60s -o Port=36000 -o KbdInteractiveAuthentication=no -o PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey -o PasswordAuthentication=no -o 'User="root"' -o ConnectTimeout=10 -o ControlPath=/Users/yangyu/.ansible/cp/4846fe66a5 9.134.124.159 '/bin/sh -c '"'"'echo ~root && sleep 0'"'"''
<9.134.124.159> (0, b'/root\n', b'')
<9.134.124.159> ESTABLISH SSH CONNECTION FOR USER: root
<9.134.124.159> SSH: EXEC ssh -C -o ControlMaster=auto -o ControlPersist=60s -o Port=36000 -o KbdInteractiveAuthentication=no -o PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey -o PasswordAuthentication=no -o 'User="root"' -o ConnectTimeout=10 -o ControlPath=/Users/yangyu/.ansible/cp/4846fe66a5 9.134.124.159 '/bin/sh -c '"'"'( umask 77 && mkdir -p "` echo /root/.ansible/tmp `"&& mkdir "` echo /root/.ansible/tmp/ansible-tmp-1600333356.414965-42861-191307013081145 `" && echo ansible-tmp-1600333356.414965-42861-191307013081145="` echo /root/.ansible/tmp/ansible-tmp-1600333356.414965-42861-191307013081145 `" ) && sleep 0'"'"''
<9.134.124.159> (0, b'ansible-tmp-1600333356.414965-42861-191307013081145=/root/.ansible/tmp/ansible-tmp-1600333356.414965-42861-191307013081145\n', b'')
Using module file /Users/yangyu/projects/ansible/lib/ansible/modules/command.py
<9.134.124.159> PUT /Users/yangyu/.ansible/tmp/ansible-local-42839upbl7lkg/tmp_66m3nen TO /root/.ansible/tmp/ansible-tmp-1600333356.414965-42861-191307013081145/AnsiballZ_command.py
<9.134.124.159> SSH: EXEC sftp -b - -C -o ControlMaster=auto -o ControlPersist=60s -o Port=36000 -o KbdInteractiveAuthentication=no -o PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey -o PasswordAuthentication=no -o 'User="root"' -o ConnectTimeout=10 -o ControlPath=/Users/yangyu/.ansible/cp/4846fe66a5 '[9.134.124.159]'
<9.134.124.159> (0, b'sftp> put /Users/yangyu/.ansible/tmp/ansible-local-42839upbl7lkg/tmp_66m3nen /root/.ansible/tmp/ansible-tmp-1600333356.414965-42861-191307013081145/AnsiballZ_command.py\n', b'')
<9.134.124.159> PUT /Users/yangyu/.ansible/tmp/ansible-local-42839upbl7lkg/tmplmizhdvg TO /root/.ansible/tmp/ansible-tmp-1600333356.414965-42861-191307013081145/async_wrapper.py
<9.134.124.159> SSH: EXEC sftp -b - -C -o ControlMaster=auto -o ControlPersist=60s -o Port=36000 -o KbdInteractiveAuthentication=no -o PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey -o PasswordAuthentication=no -o 'User="root"' -o ConnectTimeout=10 -o ControlPath=/Users/yangyu/.ansible/cp/4846fe66a5 '[9.134.124.159]'
<9.134.124.159> (0, b'sftp> put /Users/yangyu/.ansible/tmp/ansible-local-42839upbl7lkg/tmplmizhdvg /root/.ansible/tmp/ansible-tmp-1600333356.414965-42861-191307013081145/async_wrapper.py\n', b'')
<9.134.124.159> ESTABLISH SSH CONNECTION FOR USER: root
<9.134.124.159> SSH: EXEC ssh -C -o ControlMaster=auto -o ControlPersist=60s -o Port=36000 -o KbdInteractiveAuthentication=no -o PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey -o PasswordAuthentication=no -o 'User="root"' -o ConnectTimeout=10 -o ControlPath=/Users/yangyu/.ansible/cp/4846fe66a5 9.134.124.159 '/bin/sh -c '"'"'chmod u+x /root/.ansible/tmp/ansible-tmp-1600333356.414965-42861-191307013081145/ /root/.ansible/tmp/ansible-tmp-1600333356.414965-42861-191307013081145/AnsiballZ_command.py /root/.ansible/tmp/ansible-tmp-1600333356.414965-42861-191307013081145/async_wrapper.py && sleep 0'"'"''
<9.134.124.159> (0, b'', b'')
<9.134.124.159> ESTABLISH SSH CONNECTION FOR USER: root
<9.134.124.159> SSH: EXEC ssh -C -o ControlMaster=auto -o ControlPersist=60s -o Port=36000 -o KbdInteractiveAuthentication=no -o PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey -o PasswordAuthentication=no -o 'User="root"' -o ConnectTimeout=10 -o ControlPath=/Users/yangyu/.ansible/cp/4846fe66a5 -tt 9.134.124.159 '/bin/sh -c '"'"'ANSIBLE_ASYNC_DIR='"'"'"'"'"'"'"'"'~/.ansible_async'"'"'"'"'"'"'"'"' /usr/bin/python /root/.ansible/tmp/ansible-tmp-1600333356.414965-42861-191307013081145/async_wrapper.py 48991476669 10 /root/.ansible/tmp/ansible-tmp-1600333356.414965-42861-191307013081145/AnsiballZ_command.py _ && sleep 0'"'"''
<9.134.124.159> (0, b'{"started": 1, "_ansible_suppress_tmpdir_delete": true, "finished": 0, "results_file": "/root/.ansible_async/48991476669.20840", "ansible_job_id": "48991476669.20840"}\r\n', b'Shared connection to 9.134.124.159 closed.\r\n')
<9.134.124.159> ESTABLISH SSH CONNECTION FOR USER: root
<9.134.124.159> SSH: EXEC ssh -C -o ControlMaster=auto -o ControlPersist=60s -o Port=36000 -o KbdInteractiveAuthentication=no -o PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey -o PasswordAuthentication=no -o 'User="root"' -o ConnectTimeout=10 -o ControlPath=/Users/yangyu/.ansible/cp/4846fe66a5 9.134.124.159 '/bin/sh -c '"'"'echo ~root && sleep 0'"'"''
<9.134.124.159> (0, b'/root\n', b'')
<9.134.124.159> ESTABLISH SSH CONNECTION FOR USER: root
<9.134.124.159> SSH: EXEC ssh -C -o ControlMaster=auto -o ControlPersist=60s -o Port=36000 -o KbdInteractiveAuthentication=no -o PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey -o PasswordAuthentication=no -o 'User="root"' -o ConnectTimeout=10 -o ControlPath=/Users/yangyu/.ansible/cp/4846fe66a5 9.134.124.159 '/bin/sh -c '"'"'( umask 77 && mkdir -p "` echo /root/.ansible/tmp `"&& mkdir "` echo /root/.ansible/tmp/ansible-tmp-1600333358.847193-42861-146017266031103 `" && echo ansible-tmp-1600333358.847193-42861-146017266031103="` echo /root/.ansible/tmp/ansible-tmp-1600333358.847193-42861-146017266031103 `" ) && sleep 0'"'"''
<9.134.124.159> (0, b'ansible-tmp-1600333358.847193-42861-146017266031103=/root/.ansible/tmp/ansible-tmp-1600333358.847193-42861-146017266031103\n', b'')
Using module file /Users/yangyu/projects/ansible/lib/ansible/modules/async_status.py
<9.134.124.159> PUT /Users/yangyu/.ansible/tmp/ansible-local-42839upbl7lkg/tmpgapz8kyp TO /root/.ansible/tmp/ansible-tmp-1600333358.847193-42861-146017266031103/AnsiballZ_async_status.py
<9.134.124.159> SSH: EXEC sftp -b - -C -o ControlMaster=auto -o ControlPersist=60s -o Port=36000 -o KbdInteractiveAuthentication=no -o PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey -o PasswordAuthentication=no -o 'User="root"' -o ConnectTimeout=10 -o ControlPath=/Users/yangyu/.ansible/cp/4846fe66a5 '[9.134.124.159]'
<9.134.124.159> (0, b'sftp> put /Users/yangyu/.ansible/tmp/ansible-local-42839upbl7lkg/tmpgapz8kyp /root/.ansible/tmp/ansible-tmp-1600333358.847193-42861-146017266031103/AnsiballZ_async_status.py\n', b'')
<9.134.124.159> ESTABLISH SSH CONNECTION FOR USER: root
<9.134.124.159> SSH: EXEC ssh -C -o ControlMaster=auto -o ControlPersist=60s -o Port=36000 -o KbdInteractiveAuthentication=no -o PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey -o PasswordAuthentication=no -o 'User="root"' -o ConnectTimeout=10 -o ControlPath=/Users/yangyu/.ansible/cp/4846fe66a5 9.134.124.159 '/bin/sh -c '"'"'chmod u+x /root/.ansible/tmp/ansible-tmp-1600333358.847193-42861-146017266031103/ /root/.ansible/tmp/ansible-tmp-1600333358.847193-42861-146017266031103/AnsiballZ_async_status.py && sleep 0'"'"''
<9.134.124.159> (0, b'', b'')
<9.134.124.159> ESTABLISH SSH CONNECTION FOR USER: root
<9.134.124.159> SSH: EXEC ssh -C -o ControlMaster=auto -o ControlPersist=60s -o Port=36000 -o KbdInteractiveAuthentication=no -o PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey -o PasswordAuthentication=no -o 'User="root"' -o ConnectTimeout=10 -o ControlPath=/Users/yangyu/.ansible/cp/4846fe66a5 -tt 9.134.124.159 '/bin/sh -c '"'"'/usr/bin/python /root/.ansible/tmp/ansible-tmp-1600333358.847193-42861-146017266031103/AnsiballZ_async_status.py && sleep 0'"'"''
<9.134.124.159> (0, b'\r\n{"started": 1, "invocation": {"module_args": {"jid": "48991476669.20840", "mode": "status", "_async_dir": "/root/.ansible_async"}}, "finished": 0, "ansible_job_id": "48991476669.20840"}\r\n', b'Shared connection to 9.134.124.159 closed.\r\n')
ASYNC POLL on 9.134.124.159: jid=48991476669.20840 started=1 finished=0
Using module file /Users/yangyu/projects/ansible/lib/ansible/modules/async_status.py
<9.134.124.159> PUT /Users/yangyu/.ansible/tmp/ansible-local-42839upbl7lkg/tmpph94rjs7 TO /root/.ansible/tmp/ansible-tmp-1600333358.847193-42861-146017266031103/AnsiballZ_async_status.py
<9.134.124.159> SSH: EXEC sftp -b - -C -o ControlMaster=auto -o ControlPersist=60s -o Port=36000 -o KbdInteractiveAuthentication=no -o PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey -o PasswordAuthentication=no -o 'User="root"' -o ConnectTimeout=10 -o ControlPath=/Users/yangyu/.ansible/cp/4846fe66a5 '[9.134.124.159]'
<9.134.124.159> (0, b'sftp> put /Users/yangyu/.ansible/tmp/ansible-local-42839upbl7lkg/tmpph94rjs7 /root/.ansible/tmp/ansible-tmp-1600333358.847193-42861-146017266031103/AnsiballZ_async_status.py\n', b'')
<9.134.124.159> ESTABLISH SSH CONNECTION FOR USER: root
<9.134.124.159> SSH: EXEC ssh -C -o ControlMaster=auto -o ControlPersist=60s -o Port=36000 -o KbdInteractiveAuthentication=no -o PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey -o PasswordAuthentication=no -o 'User="root"' -o ConnectTimeout=10 -o ControlPath=/Users/yangyu/.ansible/cp/4846fe66a5 9.134.124.159 '/bin/sh -c '"'"'chmod u+x /root/.ansible/tmp/ansible-tmp-1600333358.847193-42861-146017266031103/ /root/.ansible/tmp/ansible-tmp-1600333358.847193-42861-146017266031103/AnsiballZ_async_status.py && sleep 0'"'"''
<9.134.124.159> (0, b'', b'')
<9.134.124.159> ESTABLISH SSH CONNECTION FOR USER: root
<9.134.124.159> SSH: EXEC ssh -C -o ControlMaster=auto -o ControlPersist=60s -o Port=36000 -o KbdInteractiveAuthentication=no -o PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey -o PasswordAuthentication=no -o 'User="root"' -o ConnectTimeout=10 -o ControlPath=/Users/yangyu/.ansible/cp/4846fe66a5 -tt 9.134.124.159 '/bin/sh -c '"'"'/usr/bin/python /root/.ansible/tmp/ansible-tmp-1600333358.847193-42861-146017266031103/AnsiballZ_async_status.py && sleep 0'"'"''
<9.134.124.159> (0, b'\r\n{"started": 1, "invocation": {"module_args": {"jid": "48991476669.20840", "mode": "status", "_async_dir": "/root/.ansible_async"}}, "finished": 0, "ansible_job_id": "48991476669.20840"}\r\n', b'Shared connection to 9.134.124.159 closed.\r\n')
ASYNC POLL on 9.134.124.159: jid=48991476669.20840 started=1 finished=0
Using module file /Users/yangyu/projects/ansible/lib/ansible/modules/async_status.py
<9.134.124.159> PUT /Users/yangyu/.ansible/tmp/ansible-local-42839upbl7lkg/tmpia9_huhw TO /root/.ansible/tmp/ansible-tmp-1600333358.847193-42861-146017266031103/AnsiballZ_async_status.py
<9.134.124.159> SSH: EXEC sftp -b - -C -o ControlMaster=auto -o ControlPersist=60s -o Port=36000 -o KbdInteractiveAuthentication=no -o PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey -o PasswordAuthentication=no -o 'User="root"' -o ConnectTimeout=10 -o ControlPath=/Users/yangyu/.ansible/cp/4846fe66a5 '[9.134.124.159]'
<9.134.124.159> (0, b'sftp> put /Users/yangyu/.ansible/tmp/ansible-local-42839upbl7lkg/tmpia9_huhw /root/.ansible/tmp/ansible-tmp-1600333358.847193-42861-146017266031103/AnsiballZ_async_status.py\n', b'')
<9.134.124.159> ESTABLISH SSH CONNECTION FOR USER: root
<9.134.124.159> SSH: EXEC ssh -C -o ControlMaster=auto -o ControlPersist=60s -o Port=36000 -o KbdInteractiveAuthentication=no -o PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey -o PasswordAuthentication=no -o 'User="root"' -o ConnectTimeout=10 -o ControlPath=/Users/yangyu/.ansible/cp/4846fe66a5 9.134.124.159 '/bin/sh -c '"'"'chmod u+x /root/.ansible/tmp/ansible-tmp-1600333358.847193-42861-146017266031103/ /root/.ansible/tmp/ansible-tmp-1600333358.847193-42861-146017266031103/AnsiballZ_async_status.py && sleep 0'"'"''
<9.134.124.159> (0, b'', b'')
<9.134.124.159> ESTABLISH SSH CONNECTION FOR USER: root
<9.134.124.159> SSH: EXEC ssh -C -o ControlMaster=auto -o ControlPersist=60s -o Port=36000 -o KbdInteractiveAuthentication=no -o PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey -o PasswordAuthentication=no -o 'User="root"' -o ConnectTimeout=10 -o ControlPath=/Users/yangyu/.ansible/cp/4846fe66a5 -tt 9.134.124.159 '/bin/sh -c '"'"'/usr/bin/python /root/.ansible/tmp/ansible-tmp-1600333358.847193-42861-146017266031103/AnsiballZ_async_status.py && sleep 0'"'"''
<9.134.124.159> (0, b'\r\n{"started": 1, "invocation": {"module_args": {"jid": "48991476669.20840", "mode": "status", "_async_dir": "/root/.ansible_async"}}, "finished": 0, "ansible_job_id": "48991476669.20840"}\r\n', b'Shared connection to 9.134.124.159 closed.\r\n')
ASYNC POLL on 9.134.124.159: jid=48991476669.20840 started=1 finished=0
Using module file /Users/yangyu/projects/ansible/lib/ansible/modules/async_status.py
<9.134.124.159> PUT /Users/yangyu/.ansible/tmp/ansible-local-42839upbl7lkg/tmp0dw1l581 TO /root/.ansible/tmp/ansible-tmp-1600333358.847193-42861-146017266031103/AnsiballZ_async_status.py
<9.134.124.159> SSH: EXEC sftp -b - -C -o ControlMaster=auto -o ControlPersist=60s -o Port=36000 -o KbdInteractiveAuthentication=no -o PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey -o PasswordAuthentication=no -o 'User="root"' -o ConnectTimeout=10 -o ControlPath=/Users/yangyu/.ansible/cp/4846fe66a5 '[9.134.124.159]'
<9.134.124.159> (0, b'sftp> put /Users/yangyu/.ansible/tmp/ansible-local-42839upbl7lkg/tmp0dw1l581 /root/.ansible/tmp/ansible-tmp-1600333358.847193-42861-146017266031103/AnsiballZ_async_status.py\n', b'')
<9.134.124.159> ESTABLISH SSH CONNECTION FOR USER: root
<9.134.124.159> SSH: EXEC ssh -C -o ControlMaster=auto -o ControlPersist=60s -o Port=36000 -o KbdInteractiveAuthentication=no -o PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey -o PasswordAuthentication=no -o 'User="root"' -o ConnectTimeout=10 -o ControlPath=/Users/yangyu/.ansible/cp/4846fe66a5 9.134.124.159 '/bin/sh -c '"'"'chmod u+x /root/.ansible/tmp/ansible-tmp-1600333358.847193-42861-146017266031103/ /root/.ansible/tmp/ansible-tmp-1600333358.847193-42861-146017266031103/AnsiballZ_async_status.py && sleep 0'"'"''
<9.134.124.159> (0, b'', b'')
<9.134.124.159> ESTABLISH SSH CONNECTION FOR USER: root
<9.134.124.159> SSH: EXEC ssh -C -o ControlMaster=auto -o ControlPersist=60s -o Port=36000 -o KbdInteractiveAuthentication=no -o PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey -o PasswordAuthentication=no -o 'User="root"' -o ConnectTimeout=10 -o ControlPath=/Users/yangyu/.ansible/cp/4846fe66a5 -tt 9.134.124.159 '/bin/sh -c '"'"'/usr/bin/python /root/.ansible/tmp/ansible-tmp-1600333358.847193-42861-146017266031103/AnsiballZ_async_status.py && sleep 0'"'"''
<9.134.124.159> (0, b'\r\n{"started": 1, "invocation": {"module_args": {"jid": "48991476669.20840", "mode": "status", "_async_dir": "/root/.ansible_async"}}, "finished": 0, "ansible_job_id": "48991476669.20840"}\r\n', b'Shared connection to 9.134.124.159 closed.\r\n')
ASYNC POLL on 9.134.124.159: jid=48991476669.20840 started=1 finished=0
Using module file /Users/yangyu/projects/ansible/lib/ansible/modules/async_status.py
<9.134.124.159> PUT /Users/yangyu/.ansible/tmp/ansible-local-42839upbl7lkg/tmp640778bz TO /root/.ansible/tmp/ansible-tmp-1600333358.847193-42861-146017266031103/AnsiballZ_async_status.py
<9.134.124.159> SSH: EXEC sftp -b - -C -o ControlMaster=auto -o ControlPersist=60s -o Port=36000 -o KbdInteractiveAuthentication=no -o PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey -o PasswordAuthentication=no -o 'User="root"' -o ConnectTimeout=10 -o ControlPath=/Users/yangyu/.ansible/cp/4846fe66a5 '[9.134.124.159]'
<9.134.124.159> (0, b'sftp> put /Users/yangyu/.ansible/tmp/ansible-local-42839upbl7lkg/tmp640778bz /root/.ansible/tmp/ansible-tmp-1600333358.847193-42861-146017266031103/AnsiballZ_async_status.py\n', b'')
<9.134.124.159> ESTABLISH SSH CONNECTION FOR USER: root
<9.134.124.159> SSH: EXEC ssh -C -o ControlMaster=auto -o ControlPersist=60s -o Port=36000 -o KbdInteractiveAuthentication=no -o PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey -o PasswordAuthentication=no -o 'User="root"' -o ConnectTimeout=10 -o ControlPath=/Users/yangyu/.ansible/cp/4846fe66a5 9.134.124.159 '/bin/sh -c '"'"'chmod u+x /root/.ansible/tmp/ansible-tmp-1600333358.847193-42861-146017266031103/ /root/.ansible/tmp/ansible-tmp-1600333358.847193-42861-146017266031103/AnsiballZ_async_status.py && sleep 0'"'"''
<9.134.124.159> (0, b'', b'')
<9.134.124.159> ESTABLISH SSH CONNECTION FOR USER: root
<9.134.124.159> SSH: EXEC ssh -C -o ControlMaster=auto -o ControlPersist=60s -o Port=36000 -o KbdInteractiveAuthentication=no -o PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey -o PasswordAuthentication=no -o 'User="root"' -o ConnectTimeout=10 -o ControlPath=/Users/yangyu/.ansible/cp/4846fe66a5 -tt 9.134.124.159 '/bin/sh -c '"'"'/usr/bin/python /root/.ansible/tmp/ansible-tmp-1600333358.847193-42861-146017266031103/AnsiballZ_async_status.py && sleep 0'"'"''
<9.134.124.159> (0, b'\r\n{"started": 1, "invocation": {"module_args": {"jid": "48991476669.20840", "mode": "status", "_async_dir": "/root/.ansible_async"}}, "finished": 0, "ansible_job_id": "48991476669.20840"}\r\n', b'Shared connection to 9.134.124.159 closed.\r\n')
ASYNC POLL on 9.134.124.159: jid=48991476669.20840 started=1 finished=0
Using module file /Users/yangyu/projects/ansible/lib/ansible/modules/async_status.py
<9.134.124.159> PUT /Users/yangyu/.ansible/tmp/ansible-local-42839upbl7lkg/tmp_snd1eu9 TO /root/.ansible/tmp/ansible-tmp-1600333358.847193-42861-146017266031103/AnsiballZ_async_status.py
<9.134.124.159> SSH: EXEC sftp -b - -C -o ControlMaster=auto -o ControlPersist=60s -o Port=36000 -o KbdInteractiveAuthentication=no -o PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey -o PasswordAuthentication=no -o 'User="root"' -o ConnectTimeout=10 -o ControlPath=/Users/yangyu/.ansible/cp/4846fe66a5 '[9.134.124.159]'
<9.134.124.159> (0, b'sftp> put /Users/yangyu/.ansible/tmp/ansible-local-42839upbl7lkg/tmp_snd1eu9 /root/.ansible/tmp/ansible-tmp-1600333358.847193-42861-146017266031103/AnsiballZ_async_status.py\n', b'')
<9.134.124.159> ESTABLISH SSH CONNECTION FOR USER: root
<9.134.124.159> SSH: EXEC ssh -C -o ControlMaster=auto -o ControlPersist=60s -o Port=36000 -o KbdInteractiveAuthentication=no -o PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey -o PasswordAuthentication=no -o 'User="root"' -o ConnectTimeout=10 -o ControlPath=/Users/yangyu/.ansible/cp/4846fe66a5 9.134.124.159 '/bin/sh -c '"'"'chmod u+x /root/.ansible/tmp/ansible-tmp-1600333358.847193-42861-146017266031103/ /root/.ansible/tmp/ansible-tmp-1600333358.847193-42861-146017266031103/AnsiballZ_async_status.py && sleep 0'"'"''
<9.134.124.159> (0, b'', b'')
<9.134.124.159> ESTABLISH SSH CONNECTION FOR USER: root
<9.134.124.159> SSH: EXEC ssh -C -o ControlMaster=auto -o ControlPersist=60s -o Port=36000 -o KbdInteractiveAuthentication=no -o PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey -o PasswordAuthentication=no -o 'User="root"' -o ConnectTimeout=10 -o ControlPath=/Users/yangyu/.ansible/cp/4846fe66a5 -tt 9.134.124.159 '/bin/sh -c '"'"'/usr/bin/python /root/.ansible/tmp/ansible-tmp-1600333358.847193-42861-146017266031103/AnsiballZ_async_status.py && sleep 0'"'"''
<9.134.124.159> (0, b'\r\n{"started": 1, "invocation": {"module_args": {"jid": "48991476669.20840", "mode": "status", "_async_dir": "/root/.ansible_async"}}, "finished": 0, "ansible_job_id": "48991476669.20840"}\r\n', b'Shared connection to 9.134.124.159 closed.\r\n')
ASYNC POLL on 9.134.124.159: jid=48991476669.20840 started=1 finished=0
Using module file /Users/yangyu/projects/ansible/lib/ansible/modules/async_status.py
<9.134.124.159> PUT /Users/yangyu/.ansible/tmp/ansible-local-42839upbl7lkg/tmpk13c6mm6 TO /root/.ansible/tmp/ansible-tmp-1600333358.847193-42861-146017266031103/AnsiballZ_async_status.py
<9.134.124.159> SSH: EXEC sftp -b - -C -o ControlMaster=auto -o ControlPersist=60s -o Port=36000 -o KbdInteractiveAuthentication=no -o PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey -o PasswordAuthentication=no -o 'User="root"' -o ConnectTimeout=10 -o ControlPath=/Users/yangyu/.ansible/cp/4846fe66a5 '[9.134.124.159]'
<9.134.124.159> (0, b'sftp> put /Users/yangyu/.ansible/tmp/ansible-local-42839upbl7lkg/tmpk13c6mm6 /root/.ansible/tmp/ansible-tmp-1600333358.847193-42861-146017266031103/AnsiballZ_async_status.py\n', b'')
<9.134.124.159> ESTABLISH SSH CONNECTION FOR USER: root
<9.134.124.159> SSH: EXEC ssh -C -o ControlMaster=auto -o ControlPersist=60s -o Port=36000 -o KbdInteractiveAuthentication=no -o PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey -o PasswordAuthentication=no -o 'User="root"' -o ConnectTimeout=10 -o ControlPath=/Users/yangyu/.ansible/cp/4846fe66a5 9.134.124.159 '/bin/sh -c '"'"'chmod u+x /root/.ansible/tmp/ansible-tmp-1600333358.847193-42861-146017266031103/ /root/.ansible/tmp/ansible-tmp-1600333358.847193-42861-146017266031103/AnsiballZ_async_status.py && sleep 0'"'"''
<9.134.124.159> (0, b'', b'')
<9.134.124.159> ESTABLISH SSH CONNECTION FOR USER: root
<9.134.124.159> SSH: EXEC ssh -C -o ControlMaster=auto -o ControlPersist=60s -o Port=36000 -o KbdInteractiveAuthentication=no -o PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey -o PasswordAuthentication=no -o 'User="root"' -o ConnectTimeout=10 -o ControlPath=/Users/yangyu/.ansible/cp/4846fe66a5 -tt 9.134.124.159 '/bin/sh -c '"'"'/usr/bin/python /root/.ansible/tmp/ansible-tmp-1600333358.847193-42861-146017266031103/AnsiballZ_async_status.py && sleep 0'"'"''
<9.134.124.159> (0, b'\r\n{"started": 1, "invocation": {"module_args": {"jid": "48991476669.20840", "mode": "status", "_async_dir": "/root/.ansible_async"}}, "finished": 0, "ansible_job_id": "48991476669.20840"}\r\n', b'Shared connection to 9.134.124.159 closed.\r\n')
ASYNC POLL on 9.134.124.159: jid=48991476669.20840 started=1 finished=0
Using module file /Users/yangyu/projects/ansible/lib/ansible/modules/async_status.py
<9.134.124.159> PUT /Users/yangyu/.ansible/tmp/ansible-local-42839upbl7lkg/tmpfjdhm2l7 TO /root/.ansible/tmp/ansible-tmp-1600333358.847193-42861-146017266031103/AnsiballZ_async_status.py
<9.134.124.159> SSH: EXEC sftp -b - -C -o ControlMaster=auto -o ControlPersist=60s -o Port=36000 -o KbdInteractiveAuthentication=no -o PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey -o PasswordAuthentication=no -o 'User="root"' -o ConnectTimeout=10 -o ControlPath=/Users/yangyu/.ansible/cp/4846fe66a5 '[9.134.124.159]'
<9.134.124.159> (0, b'sftp> put /Users/yangyu/.ansible/tmp/ansible-local-42839upbl7lkg/tmpfjdhm2l7 /root/.ansible/tmp/ansible-tmp-1600333358.847193-42861-146017266031103/AnsiballZ_async_status.py\n', b'')
<9.134.124.159> ESTABLISH SSH CONNECTION FOR USER: root
<9.134.124.159> SSH: EXEC ssh -C -o ControlMaster=auto -o ControlPersist=60s -o Port=36000 -o KbdInteractiveAuthentication=no -o PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey -o PasswordAuthentication=no -o 'User="root"' -o ConnectTimeout=10 -o ControlPath=/Users/yangyu/.ansible/cp/4846fe66a5 9.134.124.159 '/bin/sh -c '"'"'chmod u+x /root/.ansible/tmp/ansible-tmp-1600333358.847193-42861-146017266031103/ /root/.ansible/tmp/ansible-tmp-1600333358.847193-42861-146017266031103/AnsiballZ_async_status.py && sleep 0'"'"''
<9.134.124.159> (0, b'', b'')
<9.134.124.159> ESTABLISH SSH CONNECTION FOR USER: root
<9.134.124.159> SSH: EXEC ssh -C -o ControlMaster=auto -o ControlPersist=60s -o Port=36000 -o KbdInteractiveAuthentication=no -o PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey -o PasswordAuthentication=no -o 'User="root"' -o ConnectTimeout=10 -o ControlPath=/Users/yangyu/.ansible/cp/4846fe66a5 -tt 9.134.124.159 '/bin/sh -c '"'"'/usr/bin/python /root/.ansible/tmp/ansible-tmp-1600333358.847193-42861-146017266031103/AnsiballZ_async_status.py && sleep 0'"'"''
<9.134.124.159> (0, b'\r\n{"started": 1, "invocation": {"module_args": {"jid": "48991476669.20840", "mode": "status", "_async_dir": "/root/.ansible_async"}}, "finished": 0, "ansible_job_id": "48991476669.20840"}\r\n', b'Shared connection to 9.134.124.159 closed.\r\n')
ASYNC POLL on 9.134.124.159: jid=48991476669.20840 started=1 finished=0
Using module file /Users/yangyu/projects/ansible/lib/ansible/modules/async_status.py
<9.134.124.159> PUT /Users/yangyu/.ansible/tmp/ansible-local-42839upbl7lkg/tmpzqpsa6hl TO /root/.ansible/tmp/ansible-tmp-1600333358.847193-42861-146017266031103/AnsiballZ_async_status.py
<9.134.124.159> SSH: EXEC sftp -b - -C -o ControlMaster=auto -o ControlPersist=60s -o Port=36000 -o KbdInteractiveAuthentication=no -o PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey -o PasswordAuthentication=no -o 'User="root"' -o ConnectTimeout=10 -o ControlPath=/Users/yangyu/.ansible/cp/4846fe66a5 '[9.134.124.159]'
<9.134.124.159> (0, b'sftp> put /Users/yangyu/.ansible/tmp/ansible-local-42839upbl7lkg/tmpzqpsa6hl /root/.ansible/tmp/ansible-tmp-1600333358.847193-42861-146017266031103/AnsiballZ_async_status.py\n', b'')
<9.134.124.159> ESTABLISH SSH CONNECTION FOR USER: root
<9.134.124.159> SSH: EXEC ssh -C -o ControlMaster=auto -o ControlPersist=60s -o Port=36000 -o KbdInteractiveAuthentication=no -o PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey -o PasswordAuthentication=no -o 'User="root"' -o ConnectTimeout=10 -o ControlPath=/Users/yangyu/.ansible/cp/4846fe66a5 9.134.124.159 '/bin/sh -c '"'"'chmod u+x /root/.ansible/tmp/ansible-tmp-1600333358.847193-42861-146017266031103/ /root/.ansible/tmp/ansible-tmp-1600333358.847193-42861-146017266031103/AnsiballZ_async_status.py && sleep 0'"'"''
<9.134.124.159> (0, b'', b'')
<9.134.124.159> ESTABLISH SSH CONNECTION FOR USER: root
<9.134.124.159> SSH: EXEC ssh -C -o ControlMaster=auto -o ControlPersist=60s -o Port=36000 -o KbdInteractiveAuthentication=no -o PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey -o PasswordAuthentication=no -o 'User="root"' -o ConnectTimeout=10 -o ControlPath=/Users/yangyu/.ansible/cp/4846fe66a5 -tt 9.134.124.159 '/bin/sh -c '"'"'/usr/bin/python /root/.ansible/tmp/ansible-tmp-1600333358.847193-42861-146017266031103/AnsiballZ_async_status.py && sleep 0'"'"''
<9.134.124.159> (0, b'\r\n{"started": 1, "invocation": {"module_args": {"jid": "48991476669.20840", "mode": "status", "_async_dir": "/root/.ansible_async"}}, "finished": 0, "ansible_job_id": "48991476669.20840"}\r\n', b'Shared connection to 9.134.124.159 closed.\r\n')
ASYNC POLL on 9.134.124.159: jid=48991476669.20840 started=1 finished=0
Using module file /Users/yangyu/projects/ansible/lib/ansible/modules/async_status.py
<9.134.124.159> PUT /Users/yangyu/.ansible/tmp/ansible-local-42839upbl7lkg/tmp_66e23_9 TO /root/.ansible/tmp/ansible-tmp-1600333358.847193-42861-146017266031103/AnsiballZ_async_status.py
<9.134.124.159> SSH: EXEC sftp -b - -C -o ControlMaster=auto -o ControlPersist=60s -o Port=36000 -o KbdInteractiveAuthentication=no -o PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey -o PasswordAuthentication=no -o 'User="root"' -o ConnectTimeout=10 -o ControlPath=/Users/yangyu/.ansible/cp/4846fe66a5 '[9.134.124.159]'
<9.134.124.159> (0, b'sftp> put /Users/yangyu/.ansible/tmp/ansible-local-42839upbl7lkg/tmp_66e23_9 /root/.ansible/tmp/ansible-tmp-1600333358.847193-42861-146017266031103/AnsiballZ_async_status.py\n', b'')
<9.134.124.159> ESTABLISH SSH CONNECTION FOR USER: root
<9.134.124.159> SSH: EXEC ssh -C -o ControlMaster=auto -o ControlPersist=60s -o Port=36000 -o KbdInteractiveAuthentication=no -o PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey -o PasswordAuthentication=no -o 'User="root"' -o ConnectTimeout=10 -o ControlPath=/Users/yangyu/.ansible/cp/4846fe66a5 9.134.124.159 '/bin/sh -c '"'"'chmod u+x /root/.ansible/tmp/ansible-tmp-1600333358.847193-42861-146017266031103/ /root/.ansible/tmp/ansible-tmp-1600333358.847193-42861-146017266031103/AnsiballZ_async_status.py && sleep 0'"'"''
<9.134.124.159> (0, b'', b'')
<9.134.124.159> ESTABLISH SSH CONNECTION FOR USER: root
<9.134.124.159> SSH: EXEC ssh -C -o ControlMaster=auto -o ControlPersist=60s -o Port=36000 -o KbdInteractiveAuthentication=no -o PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey -o PasswordAuthentication=no -o 'User="root"' -o ConnectTimeout=10 -o ControlPath=/Users/yangyu/.ansible/cp/4846fe66a5 -tt 9.134.124.159 '/bin/sh -c '"'"'/usr/bin/python /root/.ansible/tmp/ansible-tmp-1600333358.847193-42861-146017266031103/AnsiballZ_async_status.py && sleep 0'"'"''
<9.134.124.159> (0, b'\r\n{"started": 1, "invocation": {"module_args": {"jid": "48991476669.20840", "mode": "status", "_async_dir": "/root/.ansible_async"}}, "finished": 0, "ansible_job_id": "48991476669.20840"}\r\n', b'Shared connection to 9.134.124.159 closed.\r\n')
ASYNC POLL on 9.134.124.159: jid=48991476669.20840 started=1 finished=0
fatal: [9.134.124.159]: FAILED! => {
"changed": false,
"msg": "async task did not complete within the requested time - 10s"
}
PLAY RECAP *********************************************************************
9.134.124.159 : ok=1 changed=0 unreachable=0 failed=1 skipped=0 rescued=0 ignored=0
Process finished with exit code 2
主要分兩個步驟，先將任務在被控端跑起來，再在主控端定時輪訓任務狀態。第一個步驟與前文所述內容差不多，多了一份 py 程式碼 async_wrapper.py。
task Sleep30s 入口：
從 debug 資料可以看出，在 playbook 中設定的 async 和 poll 是作為是否開啟等待與輪訓任務狀態的開關。
完整流程
此部分的流程只包含
Sleep30sTask，無Gathering factsTask。
lib/ansible/plugins/action/command.py
此處通過判斷 task 的 async 的值來判斷是否進行 async 操作，此處為 10，即 playbook 中定義的 async 值為 10。
lib/ansible/plugins/action/__init__.py
_execute_module 方法
- self._make_tmp_path() 建立臨時目錄
- 獲取當前使用者的家目錄：
echo ~root && sleep 0 - 建立臨時目錄：
( umask 77 && mkdir -p "echo /root/.ansible/tmp"&& mkdir "echo /root/.ansible/tmp/ansible-tmp-1600668712.8156748-24387-134124052814278" && echo ansible-tmp-1600668712.8156748-24387-134124052814278="echo /root/.ansible/tmp/ansible-tmp-1600668712.8156748-24387-134124052814278" ) && sleep 0
至此，完成臨時目錄的建立。
- 獲取當前使用者的家目錄：
- 拷貝
AnsiballZ_command.py到/root/.ansible/tmp/ansible-tmp-1600668712.8156748-24387-134124052814278/目錄下。其功能如前文所述 wiki: #3685
- 定時輪訓邏輯（這是相比 #3685 多出來的流程）
這裡多出來的邏輯是拷貝了一個 async_wrapper.py 檔案到目標主機
其中 async_limit 為 task 中定義的 async 值，async_jid 為隨機數。
接著生成了一個 async_cmd，也就是通過 ssh 命令，呼叫目標主機上的 async_wrapper.py 檔案的命令。最終生成的命令為：
'ANSIBLE_ASYNC_DIR=\'~/.ansible_async\' /usr/bin/python /root/.ansible/tmp/ansible-tmp-1600668712.8156748-24387-134124052814278/async_wrapper.py 586569230138 10 /root/.ansible/tmp/ansible-tmp-1600668712.8156748-24387-134124052814278/AnsiballZ_command.py _'
其中 async_wrapper.py 檔案的內容如下：
#!/usr/bin/python
# -*- coding: utf-8 -*-
_ANSIBALLZ_WRAPPER = True # For test-module.py script to tell this is a ANSIBALLZ_WRAPPER
def _ansiballz_main():
import os
import os.path
import sys
import __main__
scriptdir = None
try:
scriptdir = os.path.dirname(os.path.realpath(__main__.__file__))
except (AttributeError, OSError):
pass
excludes = set(('', '.', scriptdir))
sys.path = [p for p in sys.path if p not in excludes]
import base64
import runpy
import shutil
import tempfile
import zipfile
if sys.version_info < (3,):
PY3 = False
else:
PY3 = True
ZIPDATA = """omitted..."""
def invoke_module(modlib_path, temp_path, json_params):
z = zipfile.ZipFile(modlib_path, mode='a')
sitecustomize = u'import sys\nsys.path.insert(0,"%s")\n' % modlib_path
sitecustomize = sitecustomize.encode('utf-8')
zinfo = zipfile.ZipInfo()
zinfo.filename = 'sitecustomize.py'
zinfo.date_time = ( 2020, 9, 21, 6, 26, 19)
z.writestr(zinfo, sitecustomize)
z.close()
sys.path.insert(0, modlib_path)
from ansible.module_utils import basic
basic._ANSIBLE_ARGS = json_params
runpy.run_module(mod_name='ansible.modules.async_wrapper', init_globals=None, run_name='__main__', alter_sys=True)
print('{"msg": "New-style module did not handle its own exit", "failed": true}')
sys.exit(1)
def debug(command, zipped_mod, json_params):
basedir = os.path.join(os.path.abspath(os.path.dirname(__file__)), 'debug_dir')
args_path = os.path.join(basedir, 'args')
if command == 'explode':
z = zipfile.ZipFile(zipped_mod)
for filename in z.namelist():
if filename.startswith('/'):
raise Exception('Something wrong with this module zip file: should not contain absolute paths')
dest_filename = os.path.join(basedir, filename)
if dest_filename.endswith(os.path.sep) and not os.path.exists(dest_filename):
os.makedirs(dest_filename)
else:
directory = os.path.dirname(dest_filename)
if not os.path.exists(directory):
os.makedirs(directory)
f = open(dest_filename, 'wb')
f.write(z.read(filename))
f.close()
f = open(args_path, 'wb')
f.write(json_params)
f.close()
print('Module expanded into:')
print('%s' % basedir)
exitcode = 0
elif command == 'execute':
sys.path.insert(0, basedir)
with open(args_path, 'rb') as f:
json_params = f.read()
from ansible.module_utils import basic
basic._ANSIBLE_ARGS = json_params
runpy.run_module(mod_name='ansible.modules.async_wrapper', init_globals=None, run_name='__main__', alter_sys=True)
print('{"msg": "New-style module did not handle its own exit", "failed": true}')
sys.exit(1)
else:
print('WARNING: Unknown debug command. Doing nothing.')
exitcode = 0
return exitcode
ANSIBALLZ_PARAMS = '{"ANSIBLE_MODULE_ARGS": {}}'
if PY3:
ANSIBALLZ_PARAMS = ANSIBALLZ_PARAMS.encode('utf-8')
try:
temp_path = tempfile.mkdtemp(prefix='ansible_ansible.legacy.async_wrapper_payload_')
zipped_mod = os.path.join(temp_path, 'ansible_ansible.legacy.async_wrapper_payload.zip')
with open(zipped_mod, 'wb') as modlib:
modlib.write(base64.b64decode(ZIPDATA))
if len(sys.argv) == 2:
exitcode = debug(sys.argv[1], zipped_mod, ANSIBALLZ_PARAMS)
else:
invoke_module(zipped_mod, temp_path, ANSIBALLZ_PARAMS)
finally:
try:
shutil.rmtree(temp_path)
except (NameError, OSError):
pass
sys.exit(exitcode)
if __name__ == '__main__':
_ansiballz_main()
與 AnsiballZ_command.py 中的邏輯類似，最終執行的程式碼來自 ZIP_DATA 中的資料，此處為 ansible.modules.async_wrapper 中的 main 函式，同理，此函式也可以在 ansible 的原始碼中找到，其內容如下：
➜ tree ansible
.
├── __init__.py
├── module_utils
│ ├── __init__.py
│ ├── _text.py
│ ├── basic.py
│ ├── common
│ │ ├── __init__.py
│ │ ├── _collections_compat.py
│ │ ├── _json_compat.py
│ │ ├── _utils.py
│ │ ├── collections.py
│ │ ├── file.py
│ │ ├── parameters.py
│ │ ├── process.py
│ │ ├── sys_info.py
│ │ ├── text
│ │ │ ├── __init__.py
│ │ │ ├── converters.py
│ │ │ └── formatters.py
│ │ ├── validation.py
│ │ └── warnings.py
│ ├── compat
│ │ ├── __init__.py
│ │ ├── _selectors2.py
│ │ └── selectors.py
│ ├── distro
│ │ ├── __init__.py
│ │ └── _distro.py
│ ├── parsing
│ │ ├── __init__.py
│ │ └── convert_bool.py
│ ├── pycompat24.py
│ └── six
│ └── __init__.py
└── modules
├── __init__.py
└── async_wrapper.py
8 directories, 29 files
其中 async_wrapper.py 在 ansible 中的位置為：lib/ansible/modules/async_wrapper.py。
- 實際執行任務。這裡執行的其實是 async_wrapper.py，通過 async_wrapper.py 來呼叫 AnsiballZ_command.py。
此處總共分成兩個步驟：
- 加許可權：
chmod u+x ~/.ansible/tmp/ansible-tmp-1600668712.8156748-24387-134124052814278/ ...AnsiballZ_command.py ...async_wrapper.py && sleep 0（路徑有省略） - 執行 async_wrapper.py：
python ...async_wrapper.py 586569230138 10 ...AnsiballZ_command.py _ && sleep 0（路徑有省略）
承接第3小點，此處最終執行的是 ansible/modules/async_wrapper.py 的程式碼邏輯
ansible/modules/async_wrapper.py
- 取出傳入的引數，即 async、command.py 等
- 確定實際要執行的命令（業務命令，也就是對使用者來說，相在目標機上執行的命令）
- 通過 os.fork() 剝離主程式與子程式，子程式執行 XXX_command.py，主程式返回結束。此處涉及大量的程式間通訊（IPC），程式碼邏輯有點繞，但是有如下幾點可以確認：
- 父（主）程式提前返回，也就是 ssh 命令執行完畢。
- 子程式在父程式退出後，變成孤兒程式，然後通過
daemonize_self()函式，將自己變成一個脫離父程式的新程式。
- 新程式會再次 fork，建立一個新子程式，並在新子程式中執行 XXX_command.py ，新程式會一直等待新子程式執行完畢。
經過上述步驟，ssh 命令已返回。
輪訓執行結果
執行完上述流程後，會返回一個 result，內容如下：
{
"started": 1,
"finished": 0,
"results_file": "/root/.ansible_async/732064027558.2514",
"ansible_job_id": "732064027558.2514",
"_ansible_parsed": true,
"changed": true,
"_ansible_no_log": false
}
可以看出，結果是存放在被控端的某個目錄下，並在 lib/ansible/executor/task_executor.py 中，通過對 task 中的 async 和 poll 值的判斷，來決定是否進行結果輪詢：
輪訓的流程與執行一條 ansible 命令類似，詳見 #3685 ，此處不再贅述，不同的地方在於：
-
上傳的檔案是
AnsiballZ_async_status.py -
通過 ssh 開始執行的檔案是
AnsiballZ_async_status.py，最終執行的是：lib/ansible/modules/async_status.py。
拿到被控機上面的 task log 後，會對 task 的執行狀態進行判斷：
如果在 async 秒內，沒有完成 task，此 task 將直接返回超時；
不過從此處來看，當 task 執行完畢後，可能還存在主控端去被控端輪詢 task 的情況。
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