Docker 遇到 device-mapper problem、cookie dm_task_set_cookie failed

Docker 遇到無法啟動,於 /var/log/syslog 看到下述訊息:

  • msg="devmapper: Usage of loopback devices is strongly discouraged for production use. Please use `--storage-opt dm.thinpooldev` or use `man docker` to refer to dm.thinpooldev section."
  • msg="[graphdriver] prior storage driver devicemapper failed: devmapper: Base Device UUID and Filesystem verification failed: devicemapper: Can't set cookie dm_task_setcookie failed"
  • Error starting daemon: error initializing graphdriver: devmapper: Base Device UUID and Filesystem verification failed: devicemapper: Can't set cookie dm_task_set_cookie failed
  • docker.service: Main process exited, code=exited, status=1/FAILURE
  • Failed to start Docker Application Container Engine.

要怎麼在不重新開機的情況讓 Docker 啟動呢?

Docker 遇到 device-mapper problem、cookie dm_task_set_cookie failed

由錯誤訊息查看,主要錯誤訊息在這邊:

  • prior storage driver devicemapper failed: devmapper: Base Device UUID and Filesystem verification failed: devicemapper: Can't set cookie dm_task_set_cookie failed"

由此篇文章 Unable to start Docker due device-mapper problem "Can't set cookie dm_task_set_cookie failed" 想要將 device 先 umount 掉,也是失敗,如下述:

  1. for i in /dev/mapper/docker-; do umount $i; dmsetup remove $i; done # 失敗
  2. mv /var/lib/docker/ /var/lib/docker.backup # 會自動建立 /var/lib/docker,但是一樣無法啟動
  3. rm -fr /var/lib/docker # 還原
  4. mv /var/lib/docker.backup/ /var/lib/docker # 還原

所以 device-mapper 不是主要問題,從下述錯誤訊息的角度來查:

  • Unable to start Docker due device-mapper problem "Can't set cookie dm_task_set_cookie failed"

查到此篇文章:devicemapper: Can't set cookie dm_task_set_cookie failed

註:以下都是用 root 執行,用 $ 開頭是命令列

  1. $ ipcs # 超過 128個 (wc -l)
    ------ Semaphore Arrays --------
    key semid owner perms nsems
    0x0d4d3358 238977024 root 600 1
    0x0d4d0ec9 270172161 root 600 1
    0x0d4dc02e 281640962 root 600 1
    0x0d4db8d2 291045379 root 600 1
  2. $ cat /proc/sys/kernel/sem # 查看 semaphore 的設定值 250 32000 32 128
  3. $ echo 250 32000 32 1024 > /proc/sys/kernel/sem # 先給比較大的值
  4. $ sudo systemctl restart docker.service # 就可以啟動了,應該是 semaphore leaks
  5. $ echo 250 32000 32 128 > /proc/sys/kernel/sem # 還原回原始設定
  6. $ echo 32000 1024000000 500 32000 > /proc/sys/kernel/sem # 還原回原始設定
  7. $ sudo systemctl stop docker.service # 先關掉
  8. $ dmsetup udevcomplete_all # 清掉所有 leaks,重點在這行
  9. $ ipcs # Semaphore Arrays 都清空了
  10. $ sudo systemctl start docker.service # 就可以啟動了

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