ubuntu16.04更新docker镜像仓库的坑

ubuntu16.04更新镜像仓库的坑

1.apt-get update更新失败，报错Some index files failed to download, they have been ignored, or old ones used instead，该报错有几种可能的情况：
a网络不通，
b.镜像源地址为国外的导致拉取失败
解决方法：
a.网络不通的时候配置interface中的域名解析地址，ping拉取镜像的仓库地址验证网络是否配置完成，网络是否畅通
b.在/etc/apt/lists/sources.list中配置镜像源地址，注意备份，清空/var/lib/apt/lists下的内容，注意备份，阿里镜像源地址如下

deb http://mirrors.aliyun.com/ubuntu/ xenial main restricted
deb http://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted
deb http://mirrors.aliyun.com/ubuntu/ xenial universe
deb http://mirrors.aliyun.com/ubuntu/ xenial-updates universe
deb http://mirrors.aliyun.com/ubuntu/ xenial multiverse
deb http://mirrors.aliyun.com/ubuntu/ xenial-updates multiverse
deb http://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ xenial-security main restricted
deb http://mirrors.aliyun.com/ubuntu/ xenial-security universe
deb http://mirrors.aliyun.com/ubuntu/ xenial-security multiverse
xenial 镜像源中的该内容和系统有关，使用cat /etc/os-release 查看，根据ubuntu版本自行选择，设置完成之后再进行apt-get update操作