docker - 如何知道docker下有进程正在运行？

Question

我可能会问一个非常初级的问题，但我需要一种方法来区分 docker 下的进程和盒子中非 docker 下的进程。 “ps”命令的输出给我一种感觉，进程正在 Linux 盒子中运行，无法确认是否在 docker 的引擎盖下运行。

在相同的上下文中，docker下的进程是否可以使用docker根文件系统启动。

同样可行吗？还有其他解决方案吗？

Answer 1

您可以通过 Docker 主机上的进程树(如果使用 docker for mac/windows，则在虚拟机上)识别 Docker 进程

2924(haproxy)的父进程是2902
2902(haproxy-start)的父进程是2881
第2881章

要以树格式查看进程列表，请使用 ps -ejH 或 pstree(在 psmisc 软件包中提供)

获取 dockerd 下正在运行的内容的快速列表

/ # pstree $(pgrep dockerd)
dockerd-+-docker-containe-+-docker-containe-+-java---17*[{java}]
        |                 |                 `-8*[{docker-containe}]
        |                 |-docker-containe-+-sinopia-+-4*[{V8 WorkerThread}]
        |                 |                 |         |-{node}
        |                 |                 |         `-4*[{sinopia}]
        |                 |                 `-8*[{docker-containe}]
        |                 |-docker-containe-+-node-+-4*[{V8 WorkerThread}]
        |                 |                 |      `-{node}
        |                 |                 `-8*[{docker-containe}]
        |                 |-docker-containe-+-tinydns
        |                 |                 `-8*[{docker-containe}]
        |                 |-docker-containe-+-dnscache
        |                 |                 `-8*[{docker-containe}]
        |                 |-docker-containe-+-apt-cacher-ng
        |                 |                 `-8*[{docker-containe}]
        |                 `-20*[{docker-containe}]
        |-2*[docker-proxy---6*[{docker-proxy}]]
        |-docker-proxy---5*[{docker-proxy}]
        |-2*[docker-proxy---4*[{docker-proxy}]]
        |-docker-proxy---8*[{docker-proxy}]
        `-28*[{dockerd}]

显示 PID 的父级 (-s)

/ # pstree -aps 3744 
init,1      
  `-dockerd,1721 --pidfile=/run/docker.pid -H unix:///var/run/docker.sock --swarm-default-advertise-addr=eth0
      `-docker-containe,1728 -l unix:///var/run/docker/libcontainerd/docker-containerd.sock --shim docker-containerd-shim ...
          `-docker-containe,3711 8d923b3235eb963b735fda847b745d5629904ccef1245d4592cc986b3b9b384a...
              `-java,3744 -Dzookeeper.log.dir=. -Dzookeeper.root.logger=INFO,CONSOLE -cp/zookeeper/bin/../build/cl
                  |-{java},4174
                  |-{java},4175
                  |-{java},4176
                  |-{java},4177
                  |-{java},4190
                  |-{java},4208
                  |-{java},4209
                  |-{java},4327
                  |-{java},4328
                  |-{java},4329
                  |-{java},4330
                  |-{java},4390
                  |-{java},4416
                  |-{java},4617
                  |-{java},4625
                  |-{java},4629
                  `-{java},4632

显示 docker 的所有子级，包括命名空间更改 (-S):

/ # pstree -apS $(pgrep dockerd) 
dockerd,1721 --pidfile=/run/docker.pid -H unix:///var/run/docker.sock --swarm-default-advertise-addr=eth0
  |-docker-containe,1728 -l unix:///var/run/docker/libcontainerd/docker-containerd.sock --shim docker-containerd-shim ...
  |   |-docker-containe,3711 8d923b3235eb963b735fda847b745d5629904ccef1245d4592cc986b3b9b384a...
  |   |   |-java,3744,ipc,mnt,net,pid,uts -Dzookeeper.log.dir=. -Dzookeeper.root.logger=INFO,CONSOLE -cp/zookeeper/bin/../build/cl
  |   |   |   |-{java},4174
  |   |   |   |-{java},4175
  |   |   |   |-{java},4629
  |   |   |   `-{java},4632
  |   |   |-{docker-containe},3712
  |   |   `-{docker-containe},4152
  |   |-docker-containe,3806 49125f8274242a5ae244ffbca121f354c620355186875617d43876bcde619732...
  |   |   |-sinopia,3841,ipc,mnt,net,pid,uts                                                           
  |   |   |   |-{V8 WorkerThread},4063
  |   |   |   |-{V8 WorkerThread},4064
  |   |   |   |-{V8 WorkerThread},4065
  |   |   |   |-{V8 WorkerThread},4066
  |   |   |   |-{node},4062
  |   |   |   |-{sinopia},4333
  |   |   |   |-{sinopia},4334
  |   |   |   |-{sinopia},4335
  |   |   |   `-{sinopia},4336
  |   |   |-{docker-containe},3814
  |   |   `-{docker-containe},4038
  |   |-docker-containe,3846 2a756d94c52d934ba729927b0354014f11da6319eff4d35880a30e72e033c05d...
  |   |   |-node,3910,ipc,mnt,net,pid,uts lib/dnsd.js
  |   |   |   |-{V8 WorkerThread},4204
  |   |   |   |-{V8 WorkerThread},4205
  |   |   |   |-{V8 WorkerThread},4206
  |   |   |   |-{V8 WorkerThread},4207
  |   |   |   `-{node},4203