Docker命令不再响应

Question

大多数停靠命令永远不会结束。我必须用CTRL+C手动中断它们，甚至像docker ps或docker info这样的简单命令也不会响应。

然而，docker help和docker version仍然有效。

我认为与特定容器的死锁类似，因此与容器相关的命令不会完成。

如何处理这种情况？

我的码头版本是1.12.3。我不使用群集模式。docker logs命令也不起作用。使用dmesg，我可以看到很多I/O错误，但我不知道它是否与我的问题有关：

[12898.121287] loop: Write error at byte offset 8882749440, length 4096.
[12898.122837] loop: Write error at byte offset 8883666944, length 4096.
[12898.124685] loop: Write error at byte offset 8882814976, length 4096.
[12898.126459] loop: Write error at byte offset 8883404800, length 4096.
[12898.128201] loop: Write error at byte offset 8883470336, length 4096.
[12898.129921] loop: Write error at byte offset 8883535872, length 4096.
[12898.131774] loop: Write error at byte offset 8883601408, length 4096.
[12898.133594] loop: Write error at byte offset 8883732480, length 4096.
[12917.269786] loop: Write error at byte offset 8883798016, length 4096.
[12917.270331] quiet_error: 632 callbacks suppressed
[12917.270334] Buffer I/O error on device dm-6, logical block 1313320
[12917.270540] lost page write due to I/O error on dm-6
[12917.270543] Buffer I/O error on device dm-6, logical block 1313321
[12917.270740] lost page write due to I/O error on dm-6
[12917.270742] Buffer I/O error on device dm-6, logical block 1313322
[12917.270957] lost page write due to I/O error on dm-6
[12917.270959] Buffer I/O error on device dm-6, logical block 1313323
[12917.271177] lost page write due to I/O error on dm-6
[12917.271179] Buffer I/O error on device dm-6, logical block 1313324
[12917.271377] lost page write due to I/O error on dm-6
[12917.271379] Buffer I/O error on device dm-6, logical block 1313325
[12917.271573] lost page write due to I/O error on dm-6
[12917.301759] loop: Write error at byte offset 8883863552, length 4096.
[12917.312038] loop: Write error at byte offset 8883929088, length 4096.
[12917.312396] Buffer I/O error on device dm-6, logical block 1313328
[12917.312635] lost page write due to I/O error on dm-6
[12917.312638] Buffer I/O error on device dm-6, logical block 1313329
[12917.312867] lost page write due to I/O error on dm-6
[12917.312869] Buffer I/O error on device dm-6, logical block 1313330
[12917.313121] lost page write due to I/O error on dm-6
[12917.313123] Buffer I/O error on device dm-6, logical block 1313331
[12917.313346] lost page write due to I/O error on dm-6
[13090.853726] INFO: task kworker/u8:0:17212 blocked for more than 120 seconds.
[13090.854055] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.

使用命令sudo systemctl status -l docker，将打印以下消息，但我无法判断它们是否相关：

dockerd[1344]: time="2016-11-24T17:49:01.184874648+01:00" level=warning msg="libcontainerd: container c9f35af1836bf856001ca6156663f713c1217a697e8d2451927c67797fb5a770 restart canceled"
dockerd[1344]: time="2016-11-24T17:49:02.627116016+01:00" level=info msg="No non-localhost DNS nameservers are left in resolv.conf. Using default external servers : [nameserver 8.8.8.8 nameserver 8.8.4.4]"
dockerd[1344]: time="2016-11-24T17:49:02.627152661+01:00" level=info msg="IPv6 enabled; Adding default IPv6 external servers : [nameserver 2001:4860:4860::8888 nameserver 2001:4860:4860::8844]"
dockerd[1344]: time="2016-11-24T18:19:51.472701647+01:00" level=warning msg="libcontainerd: container c9f35af1836bf856001ca6156663f713c1217a697e8d2451927c67797fb5a770 restart canceled"
dockerd[1344]: time="2016-11-24T18:19:56.712126199+01:00" level=info msg="No non-localhost DNS nameservers are left in resolv.conf. Using default external servers : [nameserver 8.8.8.8 nameserver 8.8.4.4]"
dockerd[1344]: time="2016-11-24T18:19:56.712159759+01:00" level=info msg="IPv6 enabled; Adding default IPv6 external servers : [nameserver 2001:4860:4860::8888 nameserver 2001:4860:4860::8844]"
dockerd[1344]: time="2016-11-24T18:34:24.301786606+01:00" level=info msg="No non-localhost DNS nameservers are left in resolv.conf. Using default external servers : [nameserver 8.8.8.8 nameserver 8.8.4.4]"
dockerd[1344]: time="2016-11-24T18:34:24.302208751+01:00" level=info msg="IPv6 enabled; Adding default IPv6 external servers : [nameserver 2001:4860:4860::8888 nameserver 2001:4860:4860::8844]"

Answer 1

在我删除了一个容器后，Docker命令挂起了错误。

守护进程dockerd处于异常状态:在停止后(sudo service docker start)无法启动(service docker stop)。

# sudo service docker start
Redirecting to /bin/systemctl start docker.service
Job for docker.service failed because the control process exited with error code. See "systemctl status docker.service" and "journalctl -xe" for details.

# journalctl -xe
kernel: device-mapper: ioctl: unable to remove open device docker-253:0-19468577-d6f74dd67f106d6bfa483df4ee534dd9545dc8ca
...
systemd[1]: docker.service: main process exited, code=exited, status=1/FAILURE
systemd[1]: Failed to start Docker Application Container Engine.
systemd[1]: Unit docker.service entered failed state.
systemd[1]: docker.service failed.
polkitd[896]: Unregistered Authentication Agent for unix-process:22551:34177094 (system bus name :1.290, object path /org
ESCESC
kernel: dev_remove: 41 callbacks suppressed
kernel: device-mapper: ioctl: unable to remove open device docker-253:0-19468577-fc63401af903e22d05a4518e02504527f0d7883f9d997d7d97fdfe72ba789863
...
dockerd[22566]: time="2016-11-28T10:18:09.840268573+01:00" level=fatal msg="Error starting daemon: timeout"
systemd[1]: docker.service: main process exited, code=exited, status=1/FAILURE
systemd[1]: Failed to start Docker Application Container Engine.

此外，使用ps -eax | grep docker (在"STAT“列中存在"Z”)可以观察到许多僵尸码头进程，例如坞代理。

在重新启动服务器并重新启动Docker之后，僵尸进程消失，Docker命令再次工作。

Answer 2

我也有过类似的问题。重新启动服务器对我不起作用。我遇到了这个问题，因为我刚刚安装了一个带有某种错误的新容器。之后，大多数Docker命令都没有响应。我通过执行以下命令修复了它：

docker system prune -a

这将移除所有未使用的容器。在我的例子中，也是我刚才添加的容器。更多信息：

prune/

Answer 3

我也有同样的问题(命令没有响应)，我通过增加分配给Docker的资源来解决这个问题。

码头桌面->首选项->高级

就我而言，我增加了：

• 内存从2GB到8GB
• 从1GB交换到2GB

根据您的机器尝试不同的值。