Docker无法拉取镜像的一个解决办法

在阿里云ECS上安装了docker，安装完成后，运行hello-world报连接docker仓库超时：

#docker run hello-world

Unable to find image 'hello-world:latest' locally

Pulling repository docker.io/library/hello-world

docker: Network timed out while trying to connect to https://index.docker.io/v1/repositories/library/hello-world/images. You may want to check your internet connection or if you are behind a proxy..

See 'docker run --help'.

查了好几种方法均无效的情况下，打开网卡配置文件，设置DNS，问题解决：

#vim /etc/sysconfig/network-scripts/ifcfg-eth0

DEVICE=eth0
ONBOOT=yes
BOOTPROTO=static
IPADDR=10.132.40.37
NETMASK=255.255.240.0

DNS1=8.8.8.8                #google的DNS
DNS2=114.114.114.114        #电信的DNS
~

# service network restart