一、安装docker
###1.安装docker
yum install docker
###2.启动docker
service docker start
###3.设置docker自启动
chkconfig docker on
验证:
二、建镜像仓库
Registry的部署
#运行下面命令获取registry镜像,
$ sudo docker pull registry:2.1.1
#然后启动一个容器,
$ sudo docker run -d -v /opt/registry:/var/lib/registry -p 5000:5000 --restart=always --name registry registry:2.1.1
Registry服务默认会将上传的镜像保存在容器的/var/lib/registry,我们将主机的/opt/registry目录挂载到该目录,即可实现将镜像保存到主机的/opt/registry目录了。
运行docker ps看一下容器情况
Notebook-PC ~ $ sudo docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
f3766397a458 registry:2.1.1 "/bin/registry /etc/d" 46 seconds ago Up 45 seconds 0.0.0.0:5000->5000/tcp registry
说明我们已经启动了registry服务,打开浏览器输入http://127.0.0.1:5000/v2,出现下面情况说明registry运行正常,
三、验证
现在我们通过将镜像push到registry来验证一下。
我的机器上有个hello-world的镜像,我们要通过docker tag将该镜像标志为要推送到私有仓库,
$ sudo docker tag hello-world 127.0.0.1:5000/hello-world
然后查看以下本地的镜像,
Notebook-PC ~ $ sudo docker images
REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE
registry 2.1.1 b91f745cd233 5 days ago 220.1 MB
ubuntu 14.04 a5a467fddcb8 6 days ago 187.9 MB
hello-world latest 975b84d108f1 2 weeks ago 960 B
127.0.0.1:5000/hello-world latest 975b84d108f1 2 weeks ago 960 B
接下来,我们运行docker push将hello-world镜像push到我们的私有仓库中,
$ sudo docker push 127.0.0.1:5000/hello-world
The push refers to a repository [127.0.0.1:5000/hello-world] (len: 1)
975b84d108f1: Image successfully pushed
3f12c794407e: Image successfully pushed
latest: digest: sha256:1c7adb1ac65df0bebb40cd4a84533f787148b102684b74cb27a1982967008e4b size: 2744
现在我们可以查看我们本地/opt/registry目录下已经有了刚推送上来的hello-world。我们也在浏览器中输入http://127.0.0.1:5000/v2/_catalog,如下图所示,
现在我们可以先将我们本地的127.0.0.1:5000/hello-world和hello-world先删除掉,
$ sudo docker rmi hello-world
$ sudo docker rmi 127.0.0.1:5000/hello-world
然后使用docker pull从我们的私有仓库中获取hello-world镜像,
Notebook-PC ~ $ sudo docker pull 127.0.0.1:5000/hello-world
Using default tag: latest
latest: Pulling from hello-world
b901d36b6f2f: Pull complete
0a6ba66e537a: Pull complete
Digest: sha256:1c7adb1ac65df0bebb40cd4a84533f787148b102684b74cb27a1982967008e4b
Status: Downloaded newer image for 127.0.0.1:5000/hello-world:latest
lienhua34@lienhua34-Compaq-Presario-CQ35-Notebook-PC ~ $ sudo docker images
四、可能问题
1、可能会出现无法push镜像到私有仓库的问题。这是因为我们启动的registry服务不是安全可信赖的。这是我们需要修改docker的配置文件/etc/default/docker,添加下面的内容,
DOCKER_OPTS="--insecure-registry xxx.xxx.xxx.xxx:5000"
然后重启docker后台进程,
$ sudo service docker restart
2、Get https://10.17.33.70:4400/v1/_ping(https://10.17.33.70:4400/v1/_ping): http: server gave HTTP response to HTTPS client
修改/etc/docker/daemon.json
vi /etc/docker/daemon.json
加入:"insecure-registries":["10.17.33.70:4400"]
{
"live-restore": true ,
"insecure-registries":["10.17.33.70:4400"]
}