列舉
列出本地主機上的鏡像
[running]jihite@:~$ docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
test/ubuntu v1 80e674d9a004 18 minutes ago 64.2MB 參數：
repository: 鏡像倉庫源
TAG: 标簽，版本概念，同一個鏡像可以對應多個tag
REPOSITORY:TAG 來定義不同的鏡像
擷取一個鏡像
docker pull ubuntu:13.10 下載下傳到本地後，可以用這個鏡像來建立容器
問題： 必須把鏡像下載下傳到本地才可以在本地執行容器？
查找
方式1：https://hub.docker.com/
方式2：指令
[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]
。。。 參數：STARTS 類似 Github 裡面的 star, AUTOMATED: 自動建構
删除
docker rmi hello-world 建立
方式1：更新
使用已有鏡像來建立一個容器
[running]jihite@:~$ docker run -t -i ubuntu:15.10 /bin/bash
root@8d4479f6e4b4:/#
上面的8d4479f6e4b4是容器的id
在運作的容器内使用 apt-get update 指令進行更新
docker commit -m="has update" -a="jihite" 8d4479f6e4b4 test/ubuntu:v2 此時在看鏡像清單，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：建構
建立一個Dockerfile檔案，内容
FROM centos:6.7
MAINTAINER Fisher "[email protected]"
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 每一個指令都會在鏡像上建立一個新的層，每一個指令的字首都必須是大寫的
第一條FROM，指定使用哪個鏡像源
RUN 指令告訴docker 在鏡像内執行指令，安裝了什麼
CMD類似RUN指令，用于運作程式；RUN在docker build時執行，CMD在docker run時執行
然後，我們使用 Dockerfile 檔案，通過 docker build 指令來建構一個鏡像
[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 "[email protected]"
---> 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 設定标簽
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 hours ago 191MB