关于docker启动不了如何重新安装而不会删除现有镜像和容器

1. 先备份一下docker的内容防止安装后被清除

cd /var/lib
mkdir /var/lib/docker1
cp -rf docker/* /var/lib/docker1/

2. 删除docker

sudo yum remove docker \
                  docker-client \
                  docker-client-latest \
                  docker-common \
                  docker-latest \
                  docker-latest-logrotate \
                  docker-logrotate \
                  docker-selinux \
                  docker-engine-selinux \
                  docker-engine

3. 使用脚本安装docker并启动

curl -fsSL get.docker.com -o get-docker.sh
sudo sh get-docker.sh --mirror Aliyun
sudo systemctl enable docker
sudo systemctl start docker

4. 查看容器都在，但是启动报错了
   
5. 执行以下命令重新启动docker

grep -rl 'docker-runc' /var/lib/docker/containers/ | xargs sed -i 's/docker-runc/runc/g'
systemctl stop docker
systemctl start docker

6. 再启动容器就正常了
   

7. 如果要换目录，需要修改/lib/systemd/system/docker.service
   

8. 重启docker

systemctl daemon-reload
 
systemctl restart docker