无法运行Docker容器因为设备映射程序错误

Question

我再也不能在Docker中创建和运行新的容器了。但同时，可以运行以前创建的容器。

当我试图做这样的事情时：

[user@host ~ ] docker run --name=fpm-5.3 debian:jessie
2014/07/12 07:34:08 Error: Error running DeviceCreate (createSnapDevice) dm_task_run failed

来自docker.log

2014/07/12 05:57:11 POST /v1.12/containers/create?name=fpm-5.3
[f56fcb6f] +job create(fpm-5.3)
Error running DeviceCreate (createSnapDevice) dm_task_run failed
[f56fcb6f] -job create(fpm-5.3) = ERR (1)
[error] server.go:1025 Error: Error running DeviceCreate (createSnapDevice) dm_task_run failed
[error] server.go:90 HTTP Error: statusCode=500 Error running DeviceCreate (createSnapDevice) dm_task_run failed

dmsetup状态

docker-8:1-1210426-pool: 0 209715200 thin-pool 352 2510/524288 205173/1638400 - ro discard_passdown queue_if_no_space 

但它们在磁盘上有很大的空闲空间。

dmsetup

Name:              docker-8:1-1210426-pool
State:             ACTIVE
Read Ahead:        256
Tables present:    LIVE
Open count:        1
Event number:      1
Major, minor:      252, 0
Number of targets: 1

码头信息

Containers: 4
Images: 65
Storage Driver: devicemapper
 Pool Name: docker-8:1-1210426-pool
 Data file: /var/lib/docker/devicemapper/devicemapper/data
 Metadata file: /var/lib/docker/devicemapper/devicemapper/metadata
 Data Space Used: 12823.3 Mb
 Data Space Total: 102400.0 Mb
 Metadata Space Used: 9.9 Mb
 Metadata Space Total: 2048.0 Mb
Execution Driver: native-0.2
Kernel Version: 3.14.4

码头版

Client version: 1.0.0
Client API version: 1.12
Go version (client): go1.2.2
Git commit (client): 63fe64c
Server version: 1.0.0
Server API version: 1.12
Go version (server): go1.2.2
Git commit (server): 63fe64c

Answer 1

下面是一个Fedora/RHEL系统，所以你需要调整一下Debian.

# systemctl stop docker.service
# thin_check /var/lib/docker/devicemapper/devicemapper/metadata

如果没有错误，那么继续进行：

# thin_check --clear-needs-check-flag /var/lib/docker/devicemapper/devicemapper/metadata
# systemctl start docker.service
# docker run --name=fpm-5.3 debian:jessie

要安装thin_check命令，请运行：

# apt-get install -y thin-provisioning-tools

Answer 2

在重新启动之后，当停靠分区已填充且停靠器将不再启动时，我遇到了以下情况：

# thin_check /var/lib/docker/devicemapper/devicemapper/metadata
examining superblock
examining devices tree
  missing devices: [0, -]
    bad checksum in btree node
examining mapping tree
  thin device 72 is missing mappings [137494, 137594]
    bad checksum in btree node
  thin device 72 is missing mappings [137721, -]
    bad checksum in btree nodebad checksum in btree nodebad checksum in btree nodebad checksum in btree nodebad checksum in btree nodebad checksum in btree nodebad checksum in btree nodebad checksum in btree nodebad checksum in btree nodebad checksum in btree nodebad checksum in btree nodebad checksum in btree nodebad checksum in btree nodebad checksum in btree node

我能够用这个程序进行修复：

# thin_dump -r /var/lib/docker/devicemapper/devicemapper/metadata -o /tmp/metadata.xml
# thin_restore -i /tmp/metadata.xml -o /var/lib/docker/devicemapper/devicemapper/metadata

Answer 3

在我们的例子中，只需要启动和停止服务。

取决于您的系统，您可以运行：

service docker stop
service docker start

或者：

sudo systemctl stop docker.service
sudo systemctl start docker.service

或者：

sudo /etc/init.d/docker restart