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容器内获取容器的完整ID

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作者： 耗子007

可以通过进程自己的cgroup的信息获取，cgroup中包含了docker容器的完整ID。在容器中运行cat /proc/self/cgroup得到如下结果：

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root@60dc9bc55a76:/home# cat /proc/self/cgroup
11:devices:/docker/60dc9bc55a76c81847d502d8ed432f03c6de131a85653c7a27dbe7db25b5945a
10:cpu,cpuacct:/docker/60dc9bc55a76c81847d502d8ed432f03c6de131a85653c7a27dbe7db25b5945a
9:blkio:/docker/60dc9bc55a76c81847d502d8ed432f03c6de131a85653c7a27dbe7db25b5945a
8:cpuset:/docker/60dc9bc55a76c81847d502d8ed432f03c6de131a85653c7a27dbe7db25b5945a
7:freezer:/docker/60dc9bc55a76c81847d502d8ed432f03c6de131a85653c7a27dbe7db25b5945a
6:hugetlb:/docker/60dc9bc55a76c81847d502d8ed432f03c6de131a85653c7a27dbe7db25b5945a
5:net_cls,net_prio:/docker/60dc9bc55a76c81847d502d8ed432f03c6de131a85653c7a27dbe7db25b5945a
4:memory:/docker/60dc9bc55a76c81847d502d8ed432f03c6de131a85653c7a27dbe7db25b5945a
3:pids:/docker/60dc9bc55a76c81847d502d8ed432f03c6de131a85653c7a27dbe7db25b5945a
2:perf_event:/docker/60dc9bc55a76c81847d502d8ed432f03c6de131a85653c7a27dbe7db25b5945a
1:name=systemd:/docker/60dc9bc55a76c81847d502d8ed432f03c6de131a85653c7a27dbe7db25b5945a

可以通过下面的命令，提前出来docker容器ID：

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cat /proc/self/cgroup | grep docker | grep -o -E ‘[0-9a-f]{64}’ | head -n 1

参考链接：https://github.com/docker/docker/issues/19698