问题一 docker search error
描述：使用docker 搜索镜像时出现错误，错误信息如下：
[root@ ~]# docker search mongo
Error response from daemon: Get https://index.docker.io/v1/search?q=mongo&n=25: dial tcp: lookup index.docker.io on [240e:40:8000::11]:53: read udp [240e:82:1d01:ff40:d250:8fae:4a4a:c555]:52774->[240e:40:8000::11]:53: i/o timeout
问题原因：
dns解析问题，修改网络配置文件，加入dns，重启网络即可
vi /etc/sysconfig/network-scripts/ifcfg-*
#add dns
DNS1=8.8.8.8
DNS2=114.114.114.114
#save & exit
service network restart
问题排查：
起初怀疑是docker配置的加速器问题，修改/etc/docker/daemon.json后重启dockers失败
问题二 docker start error
描述：Job for docker.service failed because the control process exited with error code. See "systemctl status docker.service" and "journalctl -xe" for details.
[root@ docker]# vi daemon.json
[root@ docker]# systemctl daemon-reload
[root@ docker]# systemctl restart docker
Job for docker.service failed because the control process exited with error code. See "systemctl status docker.service" and "journalctl -xe" for details.
解决办法：
1、删除/etc/docker/daemon.json文件
2、修改此文件，然后重新执行以上命令，直到不出现错误为止