如何检查进程是否在docker容器中运行? [英] How to check if a process is running inside docker container?

问题描述

[Updated1]我有一个可以更改某些功能中的TCP内核参数的外壳，但是现在我需要使该外壳在Docker容器中运行，这意味着该外壳需要知道它在容器内运行并停止配置内核.

现在我不确定如何实现，这是容器内/proc/self/cgroup 的内容:

  9:hugetlb:/8:perf_event:/7:blkio:/6:冰柜:/5:设备:/4:内存:/3:cpuacct:/2:cpu:/docker/25ef774c390558ad8c4e9a859​​0b6a1956231aae404d6a7aba4dde320ff569b8b1:cpuset:/ 

我可以使用上面的任何标志来确定该过程是否在容器内运行吗?

[Updated2]:我还注意到确定某个进程是否在运行在lxc/Docker 内部，但在这种情况下似乎不起作用，我容器的/proc/1/cgroup 中的内容是:

  8:perf_event:/7:blkio:/6:冰柜:/5:设备:/4:内存:/3:cpuacct:/2:cpu:/docker/25ef774c390558ad8c4e9a859​​0b6a1956231aae404d6a7aba4dde320ff569b8b1:cpuset:/ 

否/lxc/containerid

解决方案

要检查Docker容器内部是否在Docker容器中，可以通过/proc/1/cgroup 完成.正如这篇文章建议您可以进行以下操作:

在docker容器外部，所有/proc/1/cgroup 中的条目都以/结尾，如下所示:

  vagrant @ ubuntu-13:〜$ cat/proc/1/cgroup11:名称=系统化的:/10:hugetlb:/9:perf_event:/8:blkio:/7:冰柜:/6:设备:/5:内存:/4:cpuacct:/3:CPU:/2:cpuset:/ 

在Docker容器中，某些控制组将属于Docker(或LXC):

  vagrant @ ubuntu-13:〜$ docker运行busybox cat/proc/1/cgroup11:名称=系统化的:/10:hugetlb:/9:perf_event:/8:blkio:/7:冰柜:/6:设备:/docker/3601745b3bd54d9780436faa5f0e4f72bb46231663bb99a6bb892764917832c25:内存:/4:cpuacct:/3:cpu:/docker/3601745b3bd54d9780436faa5f0e4f72bb46231663bb99a6bb892764917832c22:cpuset:/ 

[Updated1] I have a shell which will change TCP kernel parameters in some functions, but now I need to make this shell run in Docker container, that means, the shell need to know it is running inside a container and stop configuring the kernel.

Now I'm not sure how to achieve that, here is the contents of /proc/self/cgroup inside the container:

9:hugetlb:/
8:perf_event:/
7:blkio:/
6:freezer:/
5:devices:/
4:memory:/
3:cpuacct:/
2:cpu:/docker/25ef774c390558ad8c4e9a8590b6a1956231aae404d6a7aba4dde320ff569b8b
1:cpuset:/

Any flags above can I use to figure out if this process is running inside a container?

[Updated2]: I have also noticed Determining if a process runs inside lxc/Docker, but it seems not working in this case, the content in /proc/1/cgroup of my container is:

8:perf_event:/
7:blkio:/
6:freezer:/
5:devices:/
4:memory:/
3:cpuacct:/
2:cpu:/docker/25ef774c390558ad8c4e9a8590b6a1956231aae404d6a7aba4dde320ff569b8b
1:cpuset:/

No /lxc/containerid

解决方案

To check inside a Docker container if you are inside a Docker container or not can be done via /proc/1/cgroup. As this post suggests you can to the following:

Outside a docker container all entries in /proc/1/cgroup end on / as you can see here:

vagrant@ubuntu-13:~$ cat /proc/1/cgroup
11:name=systemd:/
10:hugetlb:/
9:perf_event:/
8:blkio:/
7:freezer:/
6:devices:/
5:memory:/
4:cpuacct:/
3:cpu:/
2:cpuset:/

Inside a Docker container some of the control groups will belong to Docker (or LXC):

vagrant@ubuntu-13:~$ docker run busybox cat /proc/1/cgroup
11:name=systemd:/
10:hugetlb:/
9:perf_event:/
8:blkio:/
7:freezer:/
6:devices:/docker/3601745b3bd54d9780436faa5f0e4f72bb46231663bb99a6bb892764917832c2
5:memory:/
4:cpuacct:/
3:cpu:/docker/3601745b3bd54d9780436faa5f0e4f72bb46231663bb99a6bb892764917832c2
2:cpuset:/

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