前言
Docker至今为止已经非常火了，不管是运维，还是后端开发都用得到。首先安装一版试试吧。
参考菜鸟教程进行安装，并解决一些可能遇到的问题。
环境
- 操作系统：CentOS 7.6
- 操作用户：root
- 安装时间：2020年5月21日
卸载旧版本
sudo yum remove docker \ docker-client \ docker-client-latest \ docker-common \ docker-latest \ docker-latest-logrotate \ docker-logrotate \ docker-engine
安装 Docker Engine-Community
使用 Docker 仓库进行安装
在新主机上首次安装 Docker Engine-Community 之前，需要设置 Docker 仓库。之后，您可以从仓库安装和更新 Docker。
设置仓库
安装所需的软件包。yum-utils 提供了 yum-config-manager ，并且 device mapper 存储驱动程序需要 device-mapper-persistent-data 和 lvm2。
sudo yum install -y yum-utils \ device-mapper-persistent-data \ lvm2
使用以下命令来设置稳定的仓库。
sudo yum-config-manager \ --add-repo \ https://download.docker.com/linux/centos/docker-ce.repo
安装 Docker Engine-Community
安装最新版本的 Docker Engine-Community 和 containerd：
sudo yum install docker-ce docker-ce-cli containerd.io
安装结果
[root@gxp5 default]# yum list installed |grep docker containerd.io.x86_64 1.2.13-3.2.el7 @docker-ce-stable docker-ce.x86_64 3:19.03.9-3.el7 @docker-ce-stable docker-ce-cli.x86_64 1:19.03.9-3.el7 @docker-ce-stable
启动 Docker。
sudo systemctl start docker
通过运行 hello-world 映像来验证是否正确安装了 Docker Engine-Community 。
sudo docker run hello-world WARNING: IPv4 forwarding is disabled. Networking will not work. Hello from Docker! This message shows that your installation appears to be working correctly. ...
安装遇到的问题
下载hello-world失败
[root@gxp5 docker]# sudo docker run hello-world Unable to find image 'hello-world:latest' locally ...
本地没有hello-world，且长时间下载不下来，报超时。通过添加稳定的国内docker源解决。
- 在 /etc/docker/daemon.json 中写入如下内容（如果文件不存在请新建该文件）：
{ "registry-mirrors": [ "https://dockerhub.azk8s.cn", "https://reg-mirror.qiniu.com", "https://registry.docker-cn.com" ] }
- 重启docker
sduo systemctl restart docker
配置文件/etc/sysconfig/docker不存在
- 修改service文件
vim /lib/systemd/system/docker.service
在[Service]中添加一行EnvironmentFile=/etc/sysconfig/docker
[Service] Type=notify EnvironmentFile=/etc/sysconfig/docker ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock ExecReload=/bin/kill -s HUP $MAINPID TimeoutSec=0 RestartSec=2 Restart=always
- 新增配置文件 vim /etc/sysconfig/docker
# /etc/sysconfig/docker # Modify these options if you want to change the way the docker daemon runs OPTIONS='-H tcp://0.0.0.0:4243 -H unix:///var/run/docker.sock' DOCKER_CERT_PATH=/etc/docker # If you want to add your own registry to be used for docker search and docker # pull use the ADD_REGISTRY option to list a set of registries, each prepended # with --add-registry flag. The first registry added will be the first registry # searched. # ADD_REGISTRY='--add-registry registry.access.redhat.com' # If you want to block registries from being used, uncomment the BLOCK_REGISTRY # option and give it a set of registries, each prepended with --block-registry # flag. For example adding docker.io will stop users from downloading images # from docker.io # BLOCK_REGISTRY='--block-registry' # If you have a registry secured with https but do not have proper certs # distributed, you can tell docker to not look for full authorization by # adding the registry to the INSECURE_REGISTRY line and uncommenting it. INSECURE_REGISTRY='--insecure-registry dl.dockerpool.com:5000' # On an SELinux system, if you remove the --selinux-enabled option, you # also need to turn on the docker_transition_unconfined boolean. # setsebool -P docker_transition_unconfined 1 # Location used for temporary files, such as those created by # docker load and build operations. Default is /var/lib/docker/tmp # Can be overriden by setting the following environment variable. # DOCKER_TMPDIR=/var/tmp # Controls the /etc/cron.daily/docker-logrotate cron job status. # To disable, uncomment the line below. # LOGROTATE=false
- 重启docker
systemctl daemon-reload systemctl restart docker
