通过容器提交镜像(docker commit)以及推送镜像(docker push)笔记
在本地创建一个容器后,可以依据这个容器创建本地镜像,并可把这个镜像推送到Docker hub中,以便在网络上下载使用。
查看镜像 [root@docker-test1 ~]# docker images REPOSITORY TAG IMAGE ID CREATED SIZE docker.io/ubuntu 16.04 7aa3602ab41e 5 weeks ago 115 MB 创建一个名为myubuntu的容器 [root@docker-test1 ~]# docker run -ti --name myubuntu -d docker.io/ubuntu [root@docker-test1 ~]# docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 651a8541a47d docker.io/ubuntu "/bin/bash" 37 seconds ago Up 36 seconds myubuntu docker commit :从容器创建一个新的镜像。 # docker commit [OPTIONS] CONTAINER [REPOSITORY[:TAG]] -a :提交的镜像作者; -c :使用Dockerfile指令来创建镜像; -m :提交时的说明文字; -p :在commit时,将容器暂停。 根据这个myubuntu容器提交镜像 [root@docker-test1 ~]# docker commit -a "wangshibo" -m "this is test" 651a8541a47d myubuntu:v1 sha256:6ce4aedd12cda693d0bbb857cc443a56f9f569106e09ec61aa53563d0932ea4d 再次查看镜像,发现镜像myubuntu:v1已经提交到本地了 [root@docker-test1 ~]# docker images REPOSITORY TAG IMAGE ID CREATED SIZE myubuntu v1 6ce4aedd12cd 59 seconds ago 84.1 MB docker.io/ubuntu 16.04 7aa3602ab41e 5 weeks ago 115 MB 在mybuntu:v1镜像推送到docker hub仓库中去 # docker push [OPTIONS] NAME[:TAG] OPTIONS说明: --disable-content-trust :忽略镜像的校验,默认开启 首先是登录docker hub (用户名:wangshibo 密码:*******) [root@docker-test1 ~]# docker login Login with your Docker ID to push and pull images from Docker Hub. If you don't have a Docker ID, head over to https://hub.docker.com to create one. Username (wangshibo): wangshibo Password: Login Succeeded [root@docker-test1 ~]# docker push wangshibo/myubuntu:v1 The push refers to a repository [docker.io/wangshibo/myubuntu] An image does not exist locally with the tag: docker.io/wangshibo/myubuntu 这里需要将ubuntu:v1镜像改名,在名称前加上自己的docker hub的Docker ID,即wangshibo [root@docker-test1 ~]# docker tag 6ce4aedd12cd wangshibo/myubuntu:v1 [root@docker-test1 ~]# docker images REPOSITORY TAG IMAGE ID CREATED SIZE myubuntu v1 6ce4aedd12cd 6 minutes ago 84.1 MB wangshibo/myubuntu v1 6ce4aedd12cd 6 minutes ago 84.1 MB docker.io/ubuntu 16.04 7aa3602ab41e 5 weeks ago 115 MB 再次进行推送(注意:下面的v1的tag标签可以不打,默认是latest)。推送操作时间稍微会有一点长,耐心等待~ [root@docker-test1 ~]# docker push wangshibo/myubuntu:v1 The push refers to a repository [docker.io/wangshibo/myubuntu] b5948ba9486d: Pushed 8d7ea83e3c62: Mounted from library/ubuntu 6a061ee02432: Mounted from library/ubuntu f73b2816c52a: Mounted from library/ubuntu 6267b420796f: Mounted from library/ubuntu a30b835850bf: Mounted from library/ubuntu v1: digest: sha256:e9cd9075d262848a307c92751e1a5890d883b814a31abd118161442461a1ca2d size: 1564 最后登录自己的Docker Hub,即https://hub.docker.com/ 登录后,在Repositories里面就可以看到自己在上面推送的镜像wangshibo/myubuntu:v1了,这是个对外的镜像,可以在网络上下载。 在Docker hub上可以看到这个镜像的下载命令(注意下载时跟上tag标签,如果是latest的默认tag可以不跟) 也可以直接在Docker hub上删除这个镜像(Repositories-镜像-Settings-delete) 比如在另一台服务器上下载这个镜像 [root@kevin-test ~]# docker pull wangshibo/myubuntu Pulling repository wangshibo/myubuntu Repository not found 需要跟上tag标签 [root@kevin-test ~]# docker pull wangshibo/myubuntu:v1 v1: Pulling from wangshibo/myubuntu 68e2a091ef24: Pull complete 8f9dd35f6299: Pull complete a81a6171600b: Pull complete a211a2bc7010: Pull complete 9e71a0b4f83a: Pull complete 0cf75bb335aa: Pull complete c393a882769e: Pull complete Digest: sha256:845fa3dcc9d0de1b9c701e1009918995da35a29012015f6c297a05edc489e018 Status: Downloaded newer image for wangshibo/myubuntu:v1 [root@kevin-test ~]# docker images REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE wangshibo/myubuntu v1 c393a882769e 12 minutes ago 84.11 MB 在本机删除这个镜像 [root@docker-test1 ~]# docker images REPOSITORY TAG IMAGE ID CREATED SIZE myubuntu v1 6ce4aedd12cd 15 minutes ago 84.1 MB wangshibo/myubuntu v1 6ce4aedd12cd 15 minutes ago 84.1 MB docker.io/ubuntu 16.04 7aa3602ab41e 5 weeks ago 115 MB 注意上面有两个6ce4aedd12cd的镜像ID,此时直接使用这个镜像ID是删除不掉的 [root@docker-test1 ~]# docker rmi 6ce4aedd12cd Error response from daemon: conflict: unable to delete 6ce4aedd12cd (must be forced) - image is referenced in multiple repositories 应该先删除docker tag改名前的镜像,使用镜像名称删除。(一般在docker tag镜像改名后,最好删除改名前的镜像) [root@docker-test1 ~]# docker rmi myubuntu:v1 Untagged: myubuntu:v1 Untagged: wangshibo/myubuntu@sha256:e9cd9075d262848a307c92751e1a5890d883b814a31abd118161442461a1ca2d [root@docker-test1 ~]# docker images REPOSITORY TAG IMAGE ID CREATED SIZE wangshibo/myubuntu v1 6ce4aedd12cd 15 minutes ago 84.1 MB docker.io/ubuntu 16.04 7aa3602ab41e 5 weeks ago 115 MB 这个时候就可以删除镜像ID删除了 [root@docker-test1 ~]# docker rmi 6ce4aedd12cd Untagged: wangshibo/myubuntu:v1 Deleted: sha256:6ce4aedd12cda693d0bbb857cc443a56f9f569106e09ec61aa53563d0932ea4d Deleted: sha256:0ddeb6a16badd042914c2e72b9ef0331550c1cdcc4bdc6650a90cd9f57f1501b [root@docker-test1 ~]# docker images REPOSITORY TAG IMAGE ID CREATED SIZE docker.io/ubuntu 16.04 7aa3602ab41e 5 weeks ago 115 MB
=================================删除镜像失败一例分享==================================
[root@docker-test1 ~]# docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES [root@docker-test1 ~]# docker ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 打算删除掉docker的nginx镜像, 但是发现这个镜像就是删除不了,加了-f强制删除也不行,一直报Error: No such image的错误, 最后终于找到了办法直接删除文件! [root@docker-test1 ~]# docker images REPOSITORY TAG IMAGE ID CREATED SIZE nginx latest 62f816a209e6 7 days ago 109MB [root@docker-test1 ~]# docker rmi nginx Error: No such image: nginx [root@docker-test1 ~]# docker rmi 62f816a209e6 Error: No such image: 62f816a209e6 [root@docker-test1 ~]# docker rmi 62f816a209e6 -f Error: No such image: 62f816a209e6 如上,怎么都删除不掉nginx镜像!!!!! 处理办法: [root@docker-test1 ~]# systemctl stop docker [root@docker-test1 ~]# rm -rf /var/lib/docker rm: cannot remove ‘/var/lib/docker/containers’: Device or resource busy 删除不了的原因是: 在建立容器的时候做了相应目录的挂载,没有卸载,所以Device or resource busy 解决办法: 查找挂载的目录并卸载 [root@docker-test1 ~]# cat /proc/mounts | grep "docker" /dev/mapper/centos-root /var/lib/docker/containers xfs rw,relatime,attr2,inode64,noquota 0 0 proc /run/docker/netns/default proc rw,nosuid,nodev,noexec,relatime 0 0 proc /run/docker/netns/a0626c54fd03 proc rw,nosuid,nodev,noexec,relatime 0 0 proc /run/docker/netns/b18072de4224 proc rw,nosuid,nodev,noexec,relatime 0 0 proc /run/docker/netns/b5298f643455 proc rw,nosuid,nodev,noexec,relatime 0 0 proc /run/docker/netns/9f5e97637c98 proc rw,nosuid,nodev,noexec,relatime 0 0 [root@docker-test1 ~]# umount /var/lib/docker/containers [root@docker-test1 ~]# rm -rf /var/lib/docker [root@docker-test1 ~]# systemctl start docker 再次查看就没有这个镜像了 [root@docker-test1 ~]# docker images REPOSITORY TAG IMAGE ID CREATED SIZE
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