linux_Daemon system process instructions

Ubuntu

sudo service 服务 start/stop/status

Firewall

The original Linux firewall was iptables, which was thought to be too cumbersome, and almost every distribution has its own solution;

ubuntu firewall ufw (ubuntu firewalld)

centos firewall (firewalld)   

sodu service ufw start

sodu service ufw stop

sodu service ufw status

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CentOS

sudo systemctl 服务 start

sudo systemctl 服务 stop

sudo systemctl 服务 status 

sudo systemctl firewalld start

sudo systemctl firewalld stop

sudo systemctl firewalld status