docker system命令集合的使用
目录
- docker system df
- docker system prune
- docker systemc info (docker info)
docker system 目前拥有四个子命令,分别是:
docker system df
docker system events
docker system info
docker system prune
docker system 其中最重要的一个命令就是 docker system prune 命令,清理没有使用的数据,包括镜像数据,已经停止的容器
查看 docker system 帮助
[root@localhost ~]# docker system --help Usage: docker system COMMAND Manage Docker Options: --help Print usage Commands: df Show docker disk usage events Get real time events from the server info Display system-wide information prune Remove unused data Run 'docker system COMMAND --help' for more information on a command. [root@localhost ~]#
docker system df
提供Docker整体磁盘使用率的概况,包括镜像、容器和(本地)volume。所以我们现在随时都可以查看Docker使用了多少资源。
[root@localhost ~]# docker system df TYPE TOTAL ACTIVE SIZE RECLAIMABLE Images 10 6 2.652GB 1.953GB (73%) Containers 6 6 6.922MB 0B (0%) Local Volumes 0 0 0B 0B [root@localhost ~]#
docker system prune
如果之前的命令展示出 docker 已经占用了太多空间,我们会开始清理。有一个包办一切的命令:
[root@localhost ~]# docker system prune WARNING! This will remove: - all stopped containers # 清理停止的容器 - all networks not used by at least one container #清理没有使用的网络 - all dangling images #清理废弃的镜像 - all build cache #清理构建缓存 Are you sure you want to continue? [y/N] y Total reclaimed space: 0B [root@localhost ~]#
根据警告信息可知,这个命令会删除所有关闭的容器以及dangling镜像。示例中,含有3个1GB随机文件的镜像的名称被占用了,名称为:,为dangling镜像,因此会被删除。同时,所有的中间镜像也会被删除。
更进一步,使用-a选项可以做深度清理。这时我们会看到更加严重的WARNING信息:
$ docker system prune -a WARNING! This will remove: - all stopped containers - all volumes not used by at least one container - all networks not used by at least one container - all images without at least one container associated to them Are you sure you want to continue? [y/N] y Deleted Images: untagged: test:latest deleted: sha256:c515ebfa2... deleted: sha256:07302c011... deleted: sha256:37c0c6474... deleted: sha256:5cc2b6bc4... deleted: sha256:b283b9c35... deleted: sha256:8a8b9bd8b... untagged: alpine:latest untagged: alpine@sha256:58e1a1bb75db1... deleted: sha256:4a415e366... deleted: sha256:23b9c7b43... Total reclaimed space: 2.151GB
这个命令将清理整个系统,并且只会保留真正在使用的镜像,容器,数据卷以及网络,因此需要格外谨慎。比如,我们不能在生产环境中运行prune -a命令,因为一些备用镜像(用于备份,回滚等)有时候需要用到,如果这些镜像被删除了,则运行容器时需要重新下载。
此时,所有未绑定容器的镜像将会被删除。由于第一次prune命令删除了所有容器,因此所有镜像(它们没有绑定任何容器)都会被删除。
docker systemc info (docker info)
这个命令的缩写docker info相信大家都很熟悉
[root@localhost ~]# docker system info Containers: 6 Running: 6 Paused: 0 Stopped: 0 Images: 49 Server Version: 17.06.2-ce Storage Driver: overlay Backing Filesystem: xfs Supports d_type: true Logging Driver: json-file Cgroup Driver: cgroupfs Plugins: Volume: local Network: bridge host macvlan null overlay Log: awslogs fluentd gcplogs gelf journald json-file logentries splunk syslog Swarm: inactive Runtimes: runc Default Runtime: runc Init Binary: docker-init containerd version: 6e23458c129b551d5c9871e5174f6b1b7f6d1170 runc version: 810190ceaa507aa2727d7ae6f4790c76ec1【本文由:日本cn2服务器 http://www.558idc.com/jap.html提供 转载请保留URL】50bd2 init version: 949e6fa Security Options: seccomp Profile: default Kernel Version: 3.10.0-514.26.2.el7.x86_64 Operating System: CentOS Linux 7 (Core) OSType: linux Architecture: x86_64 CPUs: 24 Total Memory: 31.21GiB Name: localhost.localdomain ID: YTL2:6RWX:IZK6:X4XC:XKMO:WVXD:LXPR:E5GN:GEJB:WIUX:L5YH:PDFB Docker Root Dir: /var/lib/docker Debug Mode (client): false Debug Mode (server): false Registry: https://index.docker.io/v1/ Experimental: false Insecure Registries: 127.0.0.0/8 Registry Mirrors: http://9zkjjecg.mirror.aliyuncs.com/ https://docker.mirrors.ustc.edu.cn/ Live Restore Enabled: false [root@localhost ~]#
详细的解释
元字符
描述
等同于 docker info
例如 docker system info
例如 docker system info | grep Images
等同于 docker events
例如:docker system events –until 1499305500
// 截止到 2017.7.6 01:45:00的操作
例如:docker system events –since 1499305500
// 从 2017.7.6 01:45:00之后的操作
例如:docker system df
例如:docker system df -v
例如:docker system prune
#包括清理以下的四种,即容器、镜像、数据卷、网络
– all stopped containers
– all volumes not used by at least one container
– all networks not used by at least one container
– all dangling images
例如:docker system prune -a
#包括以下的四种情况,主要和上比较
– all stopped containers
– all volumes not used by at least one container
– all networks not used by at least one container
– all images without at least one container associated to them
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