通过容器提交镜像（docker commit）以及推送镜像（docker push）

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 "navysummer" -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：navysummer    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 (navysummer): navysummer
Password:
Login Succeeded
 
[root@docker-test1 ~]# docker push navysummer/myubuntu:v1
The push refers to a repository [docker.io/navysummer/myubuntu]
An image does not exist locally with the tag: docker.io/navysummer/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navysummer
 
[root@docker-test1 ~]# docker tag 6ce4aedd12cd navysummer/myubuntu:v1
[root@docker-test1 ~]# docker images
REPOSITORY           TAG                 IMAGE ID            CREATED             SIZE
myubuntu             v1                  6ce4aedd12cd        6 minutes ago       84.1 MB
navysummer/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 navysummer/myubuntu:v1           
The push refers to a repository [docker.io/navysummer/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navysummer/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 navysummer/myubuntu
Pulling repository navysummer/myubuntu
Repository not found
 
需要跟上tag标签
[root@kevin-test ~]# docker pull navysummer/myubuntu:v1
v1: Pulling from navysummer/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 navysummer/myubuntu:v1
[root@kevin-test ~]# docker  images
REPOSITORY           TAG                 IMAGE ID            CREATED             VIRTUAL SIZE
navysummer/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
navysummer/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: navysummer/myubuntu@sha256:e9cd9075d262848a307c92751e1a5890d883b814a31abd118161442461a1ca2d
 
[root@docker-test1 ~]# docker images
REPOSITORY           TAG                 IMAGE ID            CREATED             SIZE
navysummer/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: navysummer/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