apt源适用于debian和ubuntu系统，源文件地址是在：/etc/apt/sources.list
内容可以切换为以下内容：
ubuntu
cat > /etc/apt/sources.list<< EOF deb http://mirrors.aliyun.com/ubuntu/ xenial main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ xenial main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ xenial-security main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ xenial-security main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ xenial-proposed main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ xenial-proposed main restricted universe multiverse EOF
以上可以看到是阿里源
debian
cat >/etc/apt/sources.list <<EOF deb http://mirrors.aliyun.com/debian stable main bullseye non-free deb http://mirrors.aliyun.com/debian stable-proposed-updates main bullseye non-free deb http://mirrors.aliyun.com/debian stable-updates main bullseye non-free deb-src http://mirrors.aliyun.com/debian stable main bullseye non-free deb-src http://mirrors.aliyun.com/debian stable-proposed-updates main bullseye non-free deb-src http://mirrors.aliyun.com/debian stable-updates main bullseye non-free EOF
apk源适用于alpine和andriod系统，源文件是在：/etc/apk/repositories
可以用下面的命令进行切换：
sed -i's/dl-cdn.alpinelinux.org/mirrors.ustc.edu.cn/g' /etc/apk/repositories #切换为中科大源
sed -i's/dl-cdn.alpinelinux.org/mirrors.aliyun.com/g' /etc/apk/repositories #切换为阿里源
sed -i's/dl-cdn.alpinelinux.org/mirror.tuna.tsinghua.edu.cn/g' /etc/apk/repositories #切换为清华源
常用工具安装：
apt install dnsutils #nslookup apt install iputils-ping #安装ping命令 apt-get install net-tools #安装ifconfig命令 apt-get install iproute2 #安装ip 命令
