centos7常用运维命令

• 立即关机 shutdown -h now
• 立即重启 shutdown -r now
• 查看剩余磁盘空间 df -lh
• 安装jdk 草考文章 https://www.cnblogs.com/Dylansuns/p/6974272.html
• 查看端口被哪个进程占用 netstat -tunlp|grep 8080
• systemctl start firewalld # 启动,
• systemctl enable firewalld # 开机启动
• systemctl stop firewalld # 关闭
• systemctl disable firewalld # 取消开机启动
• firewall-cmd –state 查看状态(此处两条’-‘)