一, 使用 netstat 命令可查看端口使用情况
(1) 查看服务端口是否启用. 常用于查看服务器进程端口是否启动
- [[email protected] ~]# netstat -nlp |grep 21050
- tcp6 0 0 :::21050 :::* LISTEN 10859/impalad
(2) 查看端口连接情况
- [[email protected] ~]# netstat -nat|grep -i "21050" 不带进程号
- tcp6 0 0 :::21050 :::* LISTEN
- tcp6 0 0 192.168.11.124:21050 192.168.11.126:32474 ESTABLISHED
- tcp6 0 0 192.168.11.124:21050 192.168.11.126:64128 ESTABLISHED
- [[email protected] ~]# netstat -natp|grep -i "21050" 带进程号
- tcp6 0 0 :::21050 :::* LISTEN 6334/impalad
- tcp6 0 0 192.168.11.126:14792 192.168.11.124:21050 ESTABLISHED 24236/java
- tcp6 0 0 192.168.11.126:32566 192.168.11.124:21050 ESTABLISHED 15111/java
(3) 统计端口的连接数
- [[email protected] ~]# netstat -nat|grep -i "21050" |wc -l
- 63
二, netstat 命令 help
- [[email protected] ~]# netstat --help 查看命令帮助
- usage: netstat [-vWeenNcCF] [<Af>] -r netstat {-V|--version|-h|--help}
- netstat [-vWnNcaeol] [<Socket> ...]
- netstat { [-vWeenNac] -I[<Iface>] | [-veenNac] -i | [-cnNe] -M | -s [-6tuw] } [delay]
- -r, --route display routing table
- -I, --interfaces=<Iface> display interface table for <Iface>
- -i, --interfaces display interface table
- -g, --groups display multicast group memberships
- -s, --statistics display networking statistics (like SNMP)
- -M, --masquerade display masqueraded connections
- -v, --verbose be verbose
- -W, --wide don't truncate IP addresses
- -n, --numeric don't resolve names
- --numeric-hosts don't resolve host names
- --numeric-ports don't resolve port names
- --numeric-users don't resolve user names
- -N, --symbolic resolve hardware names
- -e, --extend display other/more information
-p, --programs display PID/Program name for sockets 显示进程号
- -o, --timers display timers
- -c, --continuous continuous listing
-l, --listening display listening server sockets 服务端 listen
-a, --all display all sockets (default: connected) 显示所有 sockets
- -F, --fib display Forwarding Information Base (default)
- -C, --cache display routing cache instead of FIB
- -Z, --context display SELinux security context for sockets
- <Socket>={-t|--tcp} {-u|--udp} {-U|--udplite} {-S|--sctp} {-w|--raw}
- ## {-x|--unix} --ax25 --ipx --netrom
来源: http://www.bubuko.com/infodetail-3115604.html