We are seeing below 3 symptoms very frequently in our platform. Any idea or thoughts why they occurring?
Issue 1: Feb 14 03:38:55 cae-ga2-004 systemd[1]: Starting Docker Application Container Engine... Feb 14 03:38:55 cae-ga2-004 docker-current[115776]: time="2017-02-14T03:38:55.028792370Z" level=fatal msg="can't create unix socket /var/run/docker.sock: is a directory" Feb 14 03:38:55 cae-ga2-004 systemd[1]: docker.service: main process exited, code=exited, status=1/FAILURE Feb 14 03:38:55 cae-ga2-004 systemd[1]: Failed to start Docker Application Container Engine. Feb 14 03:38:55 cae-ga2-004 systemd[1]: Unit docker.service entered failed state. Feb 14 03:38:55 cae-ga2-004 systemd[1]: docker.service failed. not sure why Docker socket is getting converted to folder. This is not expected behavior. Since Docker seeing a folder rather a socket file, it is failing to restart and throwing above error Fix: stop the Docker, remove the folder ( rm –rf /var/run/docker.socket) and start the Docker again Issue 2: Feb 13 23:43:08 cae-ga1-207 docker-current[50724]: time="2017-02-13T23:43:08.459633232Z" level=fatal msg="Error starting daemon: Error initializing network controller: Error creating default \"bridge\" network: Failed to Setup IP tables: Unable to enable SKIP DNAT rule: (iptables failed... Feb 13 23:43:08 cae-ga1-207 systemd[1]: docker.service: main process exited, code=exited, status=1/FAILURE Feb 13 23:43:08 cae-ga1-207 systemd[1]: Failed to start Docker Application Container Engine. Feb 13 23:43:08 cae-ga1-207 systemd[1]: Unit docker.service entered failed state. Feb 13 23:43:08 cae-ga1-207 systemd[1]: docker.service failed. This error appears less frequency then above error. Fix: Docker restart doesn’t work. We have to stop and start the Docker. Issue 3: Below errors are throwing at nodes console output when you login to nodes kernel:unregister_netdevice: waiting for lo to become free. Usage count = 1 kernel:unregister_netdevice: waiting for lo to become free. Usage count = 1 kernel:unregister_netdevice: waiting for lo to become free. Usage count = 1 -- Srinivas Kotaru
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