docker安裝
yum install -y docker-io
[root@centos ~]# yum install -y docker-io
已加載插件：fastestmirror, langpacks
Loading mirror speeds from cached hostfile
* base: mirrors.163.com
* extras: mirrors.163.com
* updates: mirrors.163.com
正在解決依賴關系
--> 正在檢查事務
---> 軟件包 docker.x86_64.0.1.10.3-46.el7.centos.14 將被 安裝
--> 正在處理依賴關系 docker-common = 1.10.3-46.el7.centos.14，它被軟件包
.....
docker版本查詢
docker version
Client:
Version: 1.10.3
API version: 1.22
Package version: docker-common-1.10.3-46.el7.centos.14.x86_64
Go version: go1.6.3
Git commit: cb079f6-unsupported
Built: Fri Sep 16 13:24:25 2016
OS/Arch: linux/amd64
Server:
Version: 1.10.3
API version: 1.22
Package version: docker-common-1.10.3-46.el7.centos.14.x86_64
Go version: go1.6.3
Git commit: cb079f6-unsupported
Built: Fri Sep 16 13:24:25 2016
OS/Arch: linux/amd64
啟動docker
舊式語法
service docker start
centos7新式語法
systemctl start docker.service
配置開機啟動
舊式語法
chkconfig docker on
centos7新式語法
systemctl enable docker.service
###centos7 啟動docker失敗--selinux-enabled=false(時間2018-07-13) 當前新版本為1.13，默認安裝好后啟動失敗。 如不想做過多設置，可以關閉selinux-enabled=false，就可以正常啟動。 重新編輯docker配置文件： vi /etc/sysconfig/docker 找到以下這行 OPTIONS='--selinux-enabled --log-driver=journald --signature-verification=false' 將--selinux-enabled改為--selinux-enabled=false
配置加速器（阿里雲）
阿里雲的介紹：
配置Docker加速器
您可以使用如下的腳本將mirror的配置添加到docker daemon的啟動參數中。 系統要求 CentOS 7 以上，Docker 1.9 以上。 (其它linux請詳見阿里雲介紹)
sudo cp -n /lib/systemd/system/docker.service /etc/systemd/system/docker.service
sudo sed -i "s|ExecStart=/usr/bin/docker daemon|ExecStart=/usr/bin/docker daemon --registry-mirror=https://ir6ei990.mirror.aliyuncs.com|g" /etc/systemd/system/docker.service
sudo systemctl daemon-reload
sudo service docker restart
執行后不起作用，也許因為docker版本不一致，本人是手動修改成功的
找到這行
ExecStart=/usr/bin/docker-current daemon \
將自己的加速地址加進去，最后修改為
ExecStart=/usr/bin/docker-current daemon --registry-mirror=https://ir6ei990.mirror.aliyuncs.com \
然后重啟docker
systemctl daemon-reload
systemctl restart docker.service
下載鏡像（測試用，找個小的鏡像）
docker pull busybox
Using default tag: latest
Trying to pull repository docker.io/library/busybox ...
latest: Pulling from docker.io/library/busybox
56bec22e3559: Pull complete
Digest: sha256:29f5d56d12684887bdfa50dcd29fc31eea4aaf4ad3bec43daf19026a7ce69912
Status: Downloaded newer image for docker.io/busybox:latest
查看已下載的鏡像
docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
docker.io/busybox latest e02e811dd08f 4 weeks ago 1.093 MB
這就是剛才上面下載的busybox
啟動鏡像變為容器
docker run -d -it --name testbusybox busybox
44391ec69021707afbeba0c1dda7633c4b0507838fecdf37ae3ad56182754710
-d 后台啟動
-i, --interactive Keep STDIN open even if not attached
-t, --tty Allocate a pseudo-TTY
進行交互式操作（例如Shell腳本），那我們必須使用-i -t參數同容器進行數據交互。但是當通過管道同容器進行交互時，就不需要使用-t參數
--name 容器名稱（方便后續操作）
查看已經啟動的容器（鏡像）
docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
8d713216033b busybox "sh" 5 minutes ago Up 5 minutes testbusybox
進入運行中的容器
剛才啟動的容器為后台運行。我們可以通過一下命令進入啟動的容器中
docker exec -it testbusybox /bin/sh
/ # pwd
/
/ # ls
bin dev etc home proc root run sys tmp usr var
退出容器
exit
/ #
/ # exit
[root@centos ~]#
重啟or停止容器運行
docker restart testbusybox
[root@centos ~]# docker restart testbusybox
testbusybox
docker stop testbusybox
[root@centos ~]# docker stop testbusybox
testbusybox
[root@centos ~]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
發現容器關閉后docker ps 命令看不到了，默認顯示啟動的容器，我們可以通過加-a參數來顯示停止的docker容器
[root@centos ~]# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
8d713216033b busybox "sh" 22 hours ago Exited (137) About a minute ago testbusybox
44391ec69021 busybox "sh" 22 hours ago Exited (137) 22 hours ago trusting_wright
2810cbbefdbe busybox "sh" 22 hours ago Exited (0) 22 hours ago drunk_bell
ddf3b42c2970 c9bd19d022f6 "/entrypoint.sh /etc/" 2 days ago Exited (2) 2 days ago stoic_brattain
這些容器都是實際存在的。
以及啟動成容器的鏡像，無法再次run。除非刪除容器后再run。 我們拿windows的ghost打比方： 鏡像就是ghost光盤，容器就是已經裝入電腦后的系統，ghost光盤可以為一台機器安裝無限次，但是docker有點區別，已經裝了A鏡像的電腦，無法再次安裝A的鏡像。除非
1：刪除已安裝的容器，再次run A鏡像進行安裝。 2：換一個容器名字
[root@centos ~]# docker run -d -it --name testbusybox busybox
docker: Error response from daemon: Conflict. The name "/testbusybox" is already in use by container 8d713216033bd01610aa444647ce971e9d47786c81637e12b5a85659d0006b63. You have to remove (or rename) that container to be able to reuse that name..
See '/usr/bin/docker-current run --help'.
換了容器名后啟動成功
[root@centos ~]# docker run -d -it --name testbusybox1 busybox
3ec4539e98a82d07fa362c7d90ff1a27547130a642662a1b8904742ce4ed2419
刪除容器
docker rm -f testbusybox1
[root@centos ~]# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
3ec4539e98a8 busybox "sh" 57 seconds ago Up 56 seconds testbusybox1
8d713216033b busybox "sh" 22 hours ago Exited (137) 11 minutes ago testbusybox
44391ec69021 busybox "sh" 22 hours ago Exited (137) 22 hours ago trusting_wright
2810cbbefdbe busybox "sh" 22 hours ago Exited (0) 22 hours ago drunk_bell
ddf3b42c2970 c9bd19d022f6 "/entrypoint.sh /etc/" 2 days ago Exited (2) 2 days ago stoic_brattain
[root@centos ~]#
[root@centos ~]# docker rm -f testbusybox1
testbusybox1
[root@centos ~]# docker rm -f testbusybox
testbusybox
[root@centos ~]# docker rm -f trusting_wright
trusting_wright
[root@centos ~]# docker rm -f drunk_bell
drunk_bell
[root@centos ~]# docker rm -f stoic_brattain
stoic_brattain
[root@centos ~]# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
修改鏡像tag
docker tag busybox registry.cn-hangzhou.aliyuncs.com/wzgdxg/testbusybox:1.0.0
docker images
docker.io/busybox latest e02e811dd08f 4 weeks ago 1.093 MB
registry.cn-hangzhou.aliyuncs.com/wzgdxg/testbusybox 1.0.0 e02e811dd08f 4 weeks ago 1.093 MB
將busybox修改為 registry.cn-hangzhou.aliyuncs.com/wzgdxg/testbusybox:1.0.0
推送到阿里雲倉庫
前面已經修改了對應的阿里雲倉庫名/鏡像名：Tag
推送的時候就會發送到registry.cn-hangzhou.aliyuncs.com/wzgdxg/testbusybox這個倉庫中去。
具體阿里雲docker鏡像倉庫可以自行查閱阿里雲docker的幫助文檔，很簡單的。
發送前需要登錄阿里雲docker倉庫
docker login --username=wzgdxg registry.cn-hangzhou.aliyuncs.com
Password:
WARNING: login credentials saved in /root/.docker/config.json
Login Succeeded
推送
docker push registry.cn-hangzhou.aliyuncs.com/wzgdxg/testbusybox:1.0.0
The push refers to a repository [registry.cn-hangzhou.aliyuncs.com/wzgdxg/testbusybox]
e88b3f82283b: Pushed
1.0.0: digest: sha256:9393222c6789842b16bcf7306b6eb4b486d81a48d3b8b8f206589b5d1d5a6101 size: 505
刪除鏡像
docker rmi -f registry.cn-hangzhou.aliyuncs.com/wzgdxg/testbusybox:1.0.0
Untagged: registry.cn-hangzhou.aliyuncs.com/wzgdxg/testbusybox:1.0.0
[root@centos ~]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
docker.io/busybox latest e02e811dd08f 4 weeks ago 1.093 MB
從阿里雲docker倉庫拉取鏡像（剛才推送上去的鏡像）
docker pull registry.cn-hangzhou.aliyuncs.com/wzgdxg/testbusybox:1.0.0
Trying to pull repository registry.cn-hangzhou.aliyuncs.com/wzgdxg/testbusybox ...
1.0.0: Pulling from registry.cn-hangzhou.aliyuncs.com/wzgdxg/testbusybox
Digest: sha256:9393222c6789842b16bcf7306b6eb4b486d81a48d3b8b8f206589b5d1d5a6101
Status: Downloaded newer image for registry.cn-hangzhou.aliyuncs.com/wzgdxg/testbusybox:1.0.0
[root@centos ~]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
docker.io/busybox latest e02e811dd08f 4 weeks ago 1.093 MB
registry.cn-hangzhou.aliyuncs.com/wzgdxg/testbusybox 1.0.0 e02e811dd08f 4 weeks ago 1.093 MB