列举
列出本地主机上的镜像
[running]jihite@:~$ docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
test/ubuntu v1 80e674d9a004 18 minutes ago 64.2MB
参数：
repository: 镜像仓库源
TAG: 标签，版本概念，同一个镜像可以对应多个tag
REPOSITORY:TAG 来定义不同的镜像
获取一个镜像
docker pull ubuntu:13.10
下载到本地后，可以用这个镜像来创建容器
问题： 必须把镜像下载到本地才可以在本地执行容器？
查找
方式1：https://hub.docker.com/
方式2：命令
[running]jihite@:~$ docker search ubuntu
NAME DESCRIPTION STARS OFFICIAL AUTOMATED
ubuntu Ubuntu is a Debian-based Linux operating sys… 10712 [OK]
dorowu/ubuntu-desktop-lxde-vnc Docker image to provide HTML5 VNC interface … 411 [OK]
rastasheep/ubuntu-sshd Dockerized SSH service, built on top of offi… 245 [OK]
consol/ubuntu-xfce-vnc Ubuntu container with "headless" VNC session… 212 [OK]
。。。
参数：STARTS 类似 Github 里面的 star, AUTOMATED: 自动构建
删除
docker rmi hello-world
创建
方式1：更新
使用已有镜像来创建一个容器
[running]jihite@:~$ docker run -t -i ubuntu:15.10 /bin/bash
root@8d4479f6e4b4:/#
上面的8d4479f6e4b4是容器的id
在运行的容器内使用 apt-get update 命令进行更新
docker commit -m="has update" -a="jihite" 8d4479f6e4b4 test/ubuntu:v2
此时在看镜像列表，已添加v2
[running]jihite@:~$ docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
test/ubuntu v2 c5535f23fb9e 5 minutes ago 137MB
test/ubuntu v1 80e674d9a004 55 minutes ago 64.2MB
方式2：构建
创建一个Dockerfile文件，内容
FROM centos:6.7
MAINTAINER Fisher "fisher@sudops.com"
RUN /bin/echo 'root:123456' |chpasswd
RUN useradd runoob
RUN /bin/echo 'runoob:123456' |chpasswd
RUN /bin/echo -e "LANG=\"en_US.UTF-8\"" >/etc/default/local
EXPOSE 22
EXPOSE 80
CMD /usr/sbin/sshd -D
每一个指令都会在镜像上创建一个新的层，每一个指令的前缀都必须是大写的
第一条FROM，指定使用哪个镜像源
RUN 指令告诉docker 在镜像内执行命令，安装了什么
CMD类似RUN命令，用于运行程序；RUN在docker build时执行，CMD在docker run时执行
然后，我们使用 Dockerfile 文件，通过 docker build 命令来构建一个镜像
[running]jihite@:~/soft/DOCKER$ docker build -t jihite/centos:6.7 .
Sending build context to Docker daemon 2.048kB
Step 1/9 : FROM centos:6.7
6.7: Pulling from library/centos
cbddbc0189a0: Pull complete
Digest: sha256:4c952fc7d30ed134109c769387313ab864711d1bd8b4660017f9d27243622df1
Status: Downloaded newer image for centos:6.7
---> 9f1de3c6ad53
Step 2/9 : MAINTAINER Fisher "jihite@163.com"
---> Running in 89692984b2d9
Removing intermediate container 89692984b2d9
---> 7877c81fcad7
Step 3/9 : RUN /bin/echo 'root:123456' |chpasswd
---> Running in 0045a6808289
Removing intermediate container 0045a6808289
---> e69b720625a7
Step 4/9 : RUN useradd runoob
---> Running in d6922cef70ff
Removing intermediate container d6922cef70ff
---> 34126187e790
Step 5/9 : RUN /bin/echo 'runoob:123456' |chpasswd
---> Running in 66ae11b70d74
Removing intermediate container 66ae11b70d74
---> 1910f1148a66
Step 6/9 : RUN /bin/echo -e "LANG=\"en_US.UTF-8\"" >/etc/default/local
---> Running in e3af343f786f
Removing intermediate container e3af343f786f
---> 1dde7508d315
Step 7/9 : EXPOSE 22
---> Running in bdb74d714320
Removing intermediate container bdb74d714320
---> cb9d1e155251
Step 8/9 : EXPOSE 80
---> Running in 5458130fc48a
Removing intermediate container 5458130fc48a
---> 8ed17c39c39e
Step 9/9 : CMD /usr/sbin/sshd -D
---> Running in a8133ae92d3a
Removing intermediate container a8133ae92d3a
---> f9f4b6664e1d
Successfully built f9f4b6664e1d
Successfully tagged jihite/centos:6.7
设置标签
docker tag f9f4b6664e1d jihite/centos:dev
再看
[running]jihite@:~/soft/DOCKER$ docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
jihite/centos 6.7 f9f4b6664e1d 2 hours ago 191MB
jihite/centos dev f9f4b6664e1d 2