做linux运维常常于见的问题！
Mar 21 21:25:02 VM_0_9_centos httpd: (98)Address already in use: AH00072: make_sock: could not bind to address [::]:80
Mar 21 21:25:02 VM_0_9_centos httpd: (98)Address already in use: AH00072: make_sock: could not bind to address 0.0.0.0:80
Mar 21 21:25:02 VM_0_9_centos httpd: no listening sockets available, shutting down
从日志文件可以明显的看出是端口问题
一、Linux如何查看端口和关闭某个端口
1、lsof -i:端口号 用于查看某一端口的占用情况，比如查看80端口使用情况，
[root@VM_0_9_centos html]# lsof -i:80
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
nginx 25352 root 6u IPv4 82362 0t0 TCP *:http (LISTEN)
nginx 25353 nginx 6u IPv4 82362 0t0 TCP *:http (LISTEN)
可以看到80端口已经被web服务程序nginx占用
关闭某个端口用 kill -9 pid
[root@VM_0_9_centos html]# kill -9 25352
[root@VM_0_9_centos html]# kill -9 25353
2、netstat -tunlp |grep 端口号，用于查看指定的端口号的进程情况，如查看8000端口的情况，netstat -tunlp |grep 8000
查看所有端口的使用情况
[root@VM_0_9_centos html]# netstat -tunlp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN 4814/rpcbind
tcp 0 0 0.0.0.0:5908 0.0.0.0:* LISTEN 25492/qemu-kvm
tcp 0 0 0.0.0.0:6996 0.0.0.0:* LISTEN 22065/lwfs
tcp 0 0 192.168.122.1:53 0.0.0.0:* LISTEN 38296/dnsmasq
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 5278/sshd
tcp 0 0 127.0.0.1:631 0.0.0.0:* LISTEN 5013/cupsd
tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN 5962/master
tcp 0 0 0.0.0.0:8666 0.0.0.0:* LISTEN 44868/lwfs
tcp 0 0 0.0.0.0:8000 0.0.0.0:* LISTEN 22065/lwfs
查看指定端口netstat -tunlp | grep 8000
[root@VM_0_9_centos html]# netstat -tunlp | grep 8000
tcp 0 0 0.0.0.0:8000 0.0.0.0:* LISTEN 22065/lwfs