为什么云init进程在服务器创建后很久才运行？

Question

我正在编制一个新的Ubuntu18.04云服务器，并使用cloud-init安装码头。我可以看到，通过检查cloud-init文件，/var/log/cloud-init-output.log进程运行并显然完成得很好。但是我发现有几个cloud-init进程在此之后仍然运行很长时间，并且耗尽了CPU：

这些cloud-init进程每30秒左右出现在top列表上，然后放下，然后再返回。任何进一步诊断的方法..。为什么cloud-init在显然完成之后才运行，为什么有那么多进程？

我还看到一个CPU跟踪，它的规则峰值似乎遵循相同的模式：

查看/var/log/cloud-init.log，我发现它每30秒左右就会疯狂一次，输出以下内容，并一次又一次地重复少量行：

2021-11-13 19:21:25,927 - hotplug_hook.py[DEBUG]: hotplug-hook called with the following arguments: {hotplug_action: query, subsystem: net, udevaction: None, devpath: None}
2021-11-13 19:21:25,928 - handlers.py[DEBUG]: start: hotplug-hook: Handle reconfiguration on hotplug events
2021-11-13 19:21:25,928 - hotplug_hook.py[DEBUG]: Fetching datasource
2021-11-13 19:21:25,928 - handlers.py[DEBUG]: start: hotplug-hook/check-cache: attempting to read from cache [trust]
2021-11-13 19:21:25,928 - util.py[DEBUG]: Reading from /var/lib/cloud/instance/obj.pkl (quiet=False)
2021-11-13 19:21:25,928 - util.py[DEBUG]: Read 18131 bytes from /var/lib/cloud/instance/obj.pkl
2021-11-13 19:21:25,931 - util.py[DEBUG]: Reading from /run/cloud-init/.instance-id (quiet=False)
2021-11-13 19:21:25,932 - util.py[DEBUG]: Read 9 bytes from /run/cloud-init/.instance-id
2021-11-13 19:21:25,932 - stages.py[DEBUG]: restored from cache with run check: DataSourceHetzner
2021-11-13 19:21:25,932 - handlers.py[DEBUG]: finish: hotplug-hook/check-cache: SUCCESS: restored from cache with run check: DataSourceHetzner
2021-11-13 19:21:25,932 - hotplug_hook.py[DEBUG]: hotplug not supported for event of type net
2021-11-13 19:21:25,932 - handlers.py[DEBUG]: finish: hotplug-hook: SUCCESS: Handle reconfiguration on hotplug events
2021-11-13 19:21:25,932 - hotplug_hook.py[DEBUG]: Exiting hotplug handler
2021-11-13 19:21:25,932 - util.py[DEBUG]: Reading from /proc/uptime (quiet=False)
2021-11-13 19:21:25,932 - util.py[DEBUG]: Read 17 bytes from /proc/uptime
2021-11-13 19:21:25,932 - util.py[DEBUG]: cloud-init mode 'hotplug-hook' took 0.058 seconds (0.06)
2021-11-13 19:21:26,035 - hotplug_hook.py[DEBUG]: hotplug-hook called with the following arguments: {hotplug_action: query, subsystem: net, udevaction: None, devpath: None}
2021-11-13 19:21:26,035 - handlers.py[DEBUG]: start: hotplug-hook: Handle reconfiguration on hotplug events
2021-11-13 19:21:26,035 - hotplug_hook.py[DEBUG]: Fetching datasource
2021-11-13 19:21:26,035 - handlers.py[DEBUG]: start: hotplug-hook/check-cache: attempting to read from cache [trust]
2021-11-13 19:21:26,036 - util.py[DEBUG]: Reading from /var/lib/cloud/instance/obj.pkl (quiet=False)
2021-11-13 19:21:26,036 - util.py[DEBUG]: Read 18131 bytes from /var/lib/cloud/instance/obj.pkl
2021-11-13 19:21:26,039 - util.py[DEBUG]: Reading from /run/cloud-init/.instance-id (quiet=False)
2021-11-13 19:21:26,039 - util.py[DEBUG]: Read 9 bytes from /run/cloud-init/.instance-id
2021-11-13 19:21:26,039 - stages.py[DEBUG]: restored from cache with run check: DataSourceHetzner
2021-11-13 19:21:26,039 - handlers.py[DEBUG]: finish: hotplug-hook/check-cache: SUCCESS: restored from cache with run check: DataSourceHetzner
2021-11-13 19:21:26,039 - hotplug_hook.py[DEBUG]: hotplug not supported for event of type net
2021-11-13 19:21:26,040 - handlers.py[DEBUG]: finish: hotplug-hook: SUCCESS: Handle reconfiguration on hotplug events
2021-11-13 19:21:26,040 - hotplug_hook.py[DEBUG]: Exiting hotplug handler
2021-11-13 19:21:26,040 - util.py[DEBUG]: Reading from /proc/uptime (quiet=False)
2021-11-13 19:21:26,040 - util.py[DEBUG]: Read 17 bytes from /proc/uptime
2021-11-13 19:21:26,040 - util.py[DEBUG]: cloud-init mode 'hotplug-hook' took 0.054 seconds (0.06)
2021-11-13 19:21:26,054 - hotplug_hook.py[DEBUG]: hotplug-hook called with the following arguments: {hotplug_action: query, subsystem: net, udevaction: None, devpath: None}
2021-11-13 19:21:26,054 - handlers.py[DEBUG]: start: hotplug-hook: Handle reconfiguration on hotplug events
2021-11-13 19:21:26,054 - hotplug_hook.py[DEBUG]: Fetching datasource
2021-11-13 19:21:26,054 - handlers.py[DEBUG]: start: hotplug-hook/check-cache: attempting to read from cache [trust]
2021-11-13 19:21:26,055 - util.py[DEBUG]: Reading from /var/lib/cloud/instance/obj.pkl (quiet=False)
2021-11-13 19:21:26,055 - util.py[DEBUG]: Read 18131 bytes from /var/lib/cloud/instance/obj.pkl
2021-11-13 19:21:26,058 - util.py[DEBUG]: Reading from /run/cloud-init/.instance-id (quiet=False)
2021-11-13 19:21:26,058 - util.py[DEBUG]: Read 9 bytes from /run/cloud-init/.instance-id
2021-11-13 19:21:26,058 - stages.py[DEBUG]: restored from cache with run check: DataSourceHetzner
2021-11-13 19:21:26,058 - handlers.py[DEBUG]: finish: hotplug-hook/check-cache: SUCCESS: restored from cache with run check: DataSourceHetzner
2021-11-13 19:21:26,058 - hotplug_hook.py[DEBUG]: hotplug not supported for event of type net
2021-11-13 19:21:26,058 - handlers.py[DEBUG]: finish: hotplug-hook: SUCCESS: Handle reconfiguration on hotplug events
2021-11-13 19:21:26,059 - hotplug_hook.py[DEBUG]: Exiting hotplug handler
2021-11-13 19:21:26,059 - util.py[DEBUG]: Reading from /proc/uptime (quiet=False)
2021-11-13 19:21:26,059 - util.py[DEBUG]: Read 17 bytes from /proc/uptime
2021-11-13 19:21:26,059 - util.py[DEBUG]: cloud-init mode 'hotplug-hook' took 0.057 seconds (0.05)

Answer 1

从一个有用的聊天#云init IRC频道，显然这与21.4的云init版本21.3的问题有关，该版本将在几天后发布。

在此之前，一个解决办法是：

rm -f /lib/udev/rules.d/10-cloud-init-hook-hotplug.rules
sudo udevadm control --reload-rules