commit

docker commit [OPTIONS] CONTAINER [REPOSITORY[:TAG]]

Option	Short	Default	Description
--author	-a		Author (e.g., John Hannibal Smith <hannibal@a-team.com>)
--change	-c		Apply Dockerfile instruction to the created image
--message	-m		Commit message
--pause	-p	true	Pause container during commit

example:

#创建容器
tom@tom-virtual-machine:~$ sudo docker run --rm --name my_nginx -d -p 80:80 nginx
e5a46ddf376cea6f362cd8b6de6460fe0971f4cdf515d9e4897bb52df55dc9d3
tom@tom-virtual-machine:~$ sudo docker ps -a
CONTAINER ID   IMAGE     COMMAND                  CREATED         STATUS         PORTS                               NAMES
e5a46ddf376c   nginx     "/docker-entrypoint.…"   9 seconds ago   Up 7 seconds   0.0.0.0:80->80/tcp, :::80->80/tcp   my_nginx
tom@tom-virtual-machine:~$ sudo docker exec -it my_nginx /bin/bash
root@e5a46ddf376c:/# ls
bin  boot  dev	docker-entrypoint.d  docker-entrypoint.sh  etc	home  lib  lib64  media  mnt  opt  proc  root  run  sbin  srv  sys  tmp  usr  var
root@e5a46ddf376c:/# cd usr/share/doc
doc/      doc-base/ 
root@e5a46ddf376c:/# cd usr/share/doc
doc/      doc-base/ 
root@e5a46ddf376c:/# cd usr/share/doc
doc/      doc-base/ 
root@e5a46ddf376c:/# cd usr/share/nginx/html/
root@e5a46ddf376c:/usr/share/nginx/html# 
root@e5a46ddf376c:/usr/share/nginx/html# ls
50x.html  index.html
#修改inde.html的内容
root@e5a46ddf376c:/usr/share/nginx/html# echo '<h1>hello,this is my nginx!!!' > index.html 
root@e5a46ddf376c:/usr/share/nginx/html# exit 
exit
#commit image
tom@tom-virtual-machine:~$ sudo docker commit -a szy -m 'This is my nginx image' my_nginx mynginx:1
sha256:d6eba235464994c8bc5ed86e1a24d8745629519516b1d51cf68fa3982ae05dd0
tom@tom-virtual-machine:~$ sudo docker image ls
REPOSITORY   TAG       IMAGE ID       CREATED          SIZE
mynginx      1         d6eba2354649   11 seconds ago   141MB
nginx        latest    605c77e624dd   23 months ago    141MB
centos       latest    5d0da3dc9764   2 years ago      231MB
tom@tom-virtual-machine:~$ sudo docker stop e
e
tom@tom-virtual-machine:~$ sudo docker ps -a
CONTAINER ID   IMAGE     COMMAND   CREATED   STATUS    PORTS     NAMES
#使用mynigx镜像创建容器
tom@tom-virtual-machine:~$ sudo docker run --rm --name mynginx -d -p 80:80 mynginx:1
888eb2cc3cfae09c9b090ead7058ca34c7ea0ae36b4dbaa72e52d497879ad172

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