腾讯云CVM和轻量服务器操作

选择性开放防火墙端口，在服务器面板可以找到选择性打开（看你自己的需要）默认CVM开放，轻量不开放

1.卸载监控

莫怕直接用默认，干腾讯云监控&更换稳定源就行（操作如下）

#直接复制粘贴全部到SSH窗口即可
sudo -i
systemctl stop tat_agent
systemctl disable tat_agent
/usr/local/qcloud/stargate/admin/uninstall.sh
/usr/local/qcloud/YunJing/uninst.sh
/usr/local/qcloud/monitor/barad/admin/uninstall.sh
rm -f /etc/systemd/system/tat_agent.service
rm -rf /usr/local/qcloud
rm -rf /usr/local/sa
rm -rf /usr/local/agenttools
rm -rf /usr/local/qcloud
process=(sap100 secu-tcs-agent sgagent64 barad_agent agent agentPlugInD pvdriver )
for i in ${process[@]}
do
  for A in $(ps aux | grep $i | grep -v grep | awk \'{print $2}\')
  do
    kill -9 $A
  done
done

检验：TOP查看，控制面板监控仪表盘是否有记录，控制面板修改密码是否失效（失效就对了）同时也干掉腾讯云自家自带的监控报警功能（具体哪一个不知道，但是监控本身会互相唤醒守护...有点蛋疼）

2.更换清华稳定的源

（腾讯自家的一言难尽）官方的也行不过国内小鸡水土不服

#直接复制粘贴全部到SSH窗口即可
#批量修改源为清华
sources="/etc/apt/sources.list"
cat>"${sources}"<<EOF
#清华源
deb https://mirrors.tuna.tsinghua.edu.cn/debian/ buster main contrib non-free
deb https://mirrors.tuna.tsinghua.edu.cn/debian/ buster-updates main contrib non-free
deb https://mirrors.tuna.tsinghua.edu.cn/debian/ buster-backports main contrib non-free
deb https://mirrors.tuna.tsinghua.edu.cn/debian-security/ buster/updates main contrib non-free
deb-src https://mirrors.tuna.tsinghua.edu.cn/debian/ buster main contrib non-free
deb-src https://mirrors.tuna.tsinghua.edu.cn/debian/ buster-updates main contrib non-free
deb-src https://mirrors.tuna.tsinghua.edu.cn/debian/ buster-backports main contrib non-free
deb-src https://mirrors.tuna.tsinghua.edu.cn/debian-security/ buster/updates main contrib non-free
EOF

换完后记得可以更新下，update下一些软件包和系统本身

3.更换靠谱的公共DNS（自选）

#直接复制粘贴全部到SSH窗口即可
#大陆首选
sed -i \'$a\prepend domain-name-servers 223.5.5.5,119.29.29.29,223.5.5.5,183.60.83.19;\' /etc/dhcp/dhclient.conf
sed -i \'$a\dhclient\' /etc/dhcp/dhclient.conf

非大陆首选

#直接复制粘贴全部到SSH窗口即可
#非大陆首选
sed -i \'$a\prepend domain-name-servers 1.0.0.1,8.8.8.8,1.1.1.1,8.8.4.4;\' /etc/dhcp/dhclient.conf
sed -i \'$a\dhclient\' /etc/dhcp/dhclient.conf

完，有的话再记录！