docker修改容器和镜像大小

  docker修改容器和镜像大小

参考 https://blog.csdn.net/weixin_34279579/article/details/92170119

1 容器在运行一段时间的时候会突然无法写入数据，报错

docker no space left on device

2 加上某哥们搞了个镜像16G ，死活导入不了。

Google之，发现原来是Base Device Size的问题，其默认值是10G，而容器经过一段时间的运行写入文件量早已超过10G，就造成无法写入数据的问题了。

1. dm.basesize 默认为10G，限制容器和镜像的大小
2. dm.loopdatasize 存储池大小，默认为100G
3. dm.loopmetadatasize 元数据大小，默认为2G

我的docker安装  docker(4)：docker的安装(centos7)和加速

# docker info
Client:
 Debug Mode: false

Server:
 Containers: 164
  Running: 88
  Paused: 0
  Stopped: 76
 Images: 180
 Server Version: 18.09.8
 Storage Driver: devicemapper
  Pool Name: docker-253:1-838868736-pool
  Pool Blocksize: 65.54kB
  Base Device Size: 10.74GB
  Backing Filesystem: xfs
  Udev Sync Supported: true
  Data file: /dev/loop0
  Metadata file: /dev/loop1
  Data loop file: /var/lib/docker/devicemapper/devicemapper/data
  Metadata loop file: /var/lib/docker/devicemapper/devicemapper/metadata
  Data Space Used: 31.58GB
  Data Space Total: 107.4GB
  Data Space Available: 66.25GB
  Metadata Space Used: 58.82MB
  Metadata Space Total: 2.147GB
  Metadata Space Available: 2.089GB
  Thin Pool Minimum Free Space: 10.74GB
...

 

• 调整docker服务端启动参数

# vim /usr/lib/systemd/system/docker.service
[root@k8s-master ~]# grep "ExecStart=" /usr/lib/systemd/system/docker.service
ExecStart=/usr/bin/dockerd  -H fd:// --containerd=/run/containerd/containerd.sock -s=devicemapper --storage-opt dm.basesize=60G --storage-opt dm.loopmetadatasize=20G

• 重启docker

systemctl daemon-reload
systemctl restart docker

 

• 查看调整

# ps -ef | grep docker|grep /usr/bin/dockerd|grep -v grep
root     31409     1  4 12:14 ?        00:00:11 /usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock -s=devicemapper --storage-opt dm.basesize=60G --storage-opt dm.loopmetadatasize=20G

 

# docker info
....
 Storage Driver: devicemapper
  Pool Name: docker-253:1-503320265-pool
  Pool Blocksize: 65.54kB
  Base Device Size: 64.42GB
  Backing Filesystem: xfs
  Udev Sync Supported: true
  Data file: /dev/loop0
  Metadata file: /dev/loop1
  Data loop file: /var/lib/docker/devicemapper/devicemapper/data
  Metadata loop file: /var/lib/docker/devicemapper/devicemapper/metadata
  Data Space Used: 2.064GB
  Data Space Total: 107.4GB
  Data Space Available: 29.91GB
  Metadata Space Used: 22.07MB
  Metadata Space Total: 17.05GB
  Metadata Space Available: 17.02GB
  Thin Pool Minimum Free Space: 10.74GB
....