解决方案 ："1月11日ECS Linux系统安装源（yum/deb/apt等）服务暂停与升级"

这里就是重点来了，如何解决本次的软件源暂时无法使用的问题呢？ 那就是提前换一个可以使用的软件源。
这里需要用到代码编辑器和SFTP软件，如果没有安装，建议参考： 【云计算的1024种玩法】ECS和轻量应用服务器的远程控制入门

RHEL、CentoS

修改 /etc/yum.repos.d/ 目录下的文件，例如：CentOS-Base.repo 、epel.repo 等，这里以修改 CentOS 7 本身的软件源文件 CentOS-Base.repo 为例：
将 CentOS-Base.repo 修改为 CentOS-Base.repo.old
然后创建一个新的 CentOS-Base.repo 文件，写入清华源的内容：

# CentOS-Base.repo
#
# The mirror system uses the connecting IP address of the client and the
# update status of each mirror to pick mirrors that are updated to and
# geographically close to the client.  You should use this for CentOS updates
# unless you are manually picking other mirrors.
#
# If the mirrorlist= does not work for you, as a fall back you can try the
# remarked out baseurl= line instead.
#
#

[base]
name=CentOS-$releasever - Base
baseurl=https://mirrors.tuna.tsinghua.edu.cn/centos/$releasever/os/$basearch/
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

#released updates
[updates]
name=CentOS-$releasever - Updates
baseurl=https://mirrors.tuna.tsinghua.edu.cn/centos/$releasever/updates/$basearch/
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

#additional packages that may be useful
[extras]
name=CentOS-$releasever - Extras
baseurl=https://mirrors.tuna.tsinghua.edu.cn/centos/$releasever/extras/$basearch/
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-$releasever - Plus
baseurl=https://mirrors.tuna.tsinghua.edu.cn/centos/$releasever/centosplus/$basearch/
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
然后运行 ：


yum makecache
更新软件源缓存即可。
等问题修复，将该文件删除并将 CentOS-Base.repo.old 重新命名回来并更新缓存即可。
其他 CentOS 版本可以参考： https://mirror.tuna.tsinghua.edu.cn/help/centos/



Debian、Ubuntu


修改 /etc/apt/sources.list 文件，重命名为 /etc/apt/sources.list.old
然后重新创建 /etc/apt/sources.list 文件，内容为：
# 默认注释了源码镜像以提高 apt update 速度，如有需要可自行取消注释
deb https://mirrors.tuna.tsinghua.edu.cn/OS/ CODE main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/OS/ CODE main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/OS/ CODE-updates main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/OS/ CODE-updates main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/OS/ CODE-backports main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/OS/ CODE-backports main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/OS/ CODE-security main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/OS/ CODE-security main restricted universe multiverse

# 预发布软件源，不建议启用
# deb https://mirrors.tuna.tsinghua.edu.cn/OS/ CODE-proposed main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/OS/ CODE-proposed main restricted universe multiverse

注： 其中， OS 代表 debian 或者 ubuntu， CODE 代表发型代号，例如 Ubuntu 18.04 是 artful，Debian 9 是 stretch
展示一下 Ubuntu 16.04 的清华源替换方式：


# 默认注释了源码镜像以提高 apt update 速度，如有需要可自行取消注释
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-updates main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-updates main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-backports main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-backports main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-security main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-security main restricted universe multiverse

# 预发布软件源，不建议启用
# deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-proposed main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-proposed main restricted universe multiverse

等问题修复，将该文件删除并将 /etc/apt/sources.list.old 重新命名回来并更新缓存即可。
使用阿里云提供的默认软件源的话，走的是 ECS 的内网速度更加的快而且走的公网也更加安全可靠。