linux系统开启指定端口
通常在linux系统运维的时候需要测试某端口是否可访问，也就是测试端口的连通性
操作方法
- 01
测试主机linux主机是否安装该命令工具，出现以下提示说明nc命令未安装 [root@localhost ~]# nc -l 8888 -bash: nc: command not found
- 02
安装nc命令 root@localhost ~]# yum install -y nc
- 03
查看当前启动的端口 [root@localhost ~]# netstat -luntp Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 1355/sshd tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN 2416/master tcp6 0 0 :::22 :::* LISTEN 1355/sshd tcp6 0 0 ::1:25 :::* LISTEN 2416/master udp 0 0 0.0.0.0:68 0.0.0.0:* 10838/dhclient udp 0 0 0.0.0.0:8561 0.0.0.0:* 10838/dhclient udp6 0 0 :::6388 :::* 10838/dhclient [root@localhost ~]# nc -l 8888
- 04
启动测试端口 [root@localhost ~]# nc -l 8888
- 05
确认端口是否已经有8888的端口 [root@localhost ~]# netstat -luntp Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 1355/sshd tcp 0 0 0.0.0.0:8888 0.0.0.0:* LISTEN 20289/nc tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN 2416/master tcp6 0 0 :::22 :::* LISTEN 1355/sshd tcp6 0 0 :::8888 :::* LISTEN 20289/nc tcp6 0 0 ::1:25 :::* LISTEN 2416/master udp 0 0 0.0.0.0:68 0.0.0.0:* 10838/dhclient udp 0 0 0.0.0.0:8561 0.0.0.0:* 10838/dhclient udp6 0 0 :::6388 :::* 10838/dhclient
- 06
好了现在可以进行其他相关测试了