Linux系统查看端口常用命令

Linux系统查看端口常用命令:lsofnetstat

  • lsof

    lsof (list open files)是一个显示系统当前打开文件的工具。Linux系统的应用程序都会有自己的文件描述符,通过文件描述符与操作系统进行交互。可用此命令进行系统监控、网络信息查看等,本文主要介绍端口相关操作。
  1. 安装(CentOS)

    有些系统需要手动安装:

    [root@localhost ~]# yum install lsof
    
  2. 本机网络端口使用情况

    1.1 lsof -i
    列举当前所有端口连接信息,输出信息列表:

    COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME
    进程名称 进程标识符 用户 文件描述符 类型 指定磁盘名称 文件大小 文件在磁盘上的标识 打开文件确切名称(谁在访问)
    [root@localhost ~]# lsof -i
    COMMAND     PID  USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
    dhclient    707  root    6u  IPv4  12256      0t0  UDP *:bootpc 
    dhclient    707  root   20u  IPv4  12211      0t0  UDP *:52171 
    dhclient    707  root   21u  IPv6  12212      0t0  UDP *:cgms 
    ntpd        799   ntp   16u  IPv4  13267      0t0  UDP *:ntp 
    ntpd        799   ntp   17u  IPv6  13268      0t0  UDP *:ntp 
    ntpd        799   ntp   18u  IPv4  13273      0t0  UDP localhost:ntp 
    ntpd        799   ntp   19u  IPv4  13274      0t0  UDP localhost:ntp 
    AliYunDun  1053  root   21u  IPv4 307323      0t0  TCP localhost:43876->100.100.30.25:http (ESTABLISHED)
    sshd       1162  root    3u  IPv4  14660      0t0  TCP *:ssh (LISTEN)
    java      19680 nexus   82u  IPv4 300159      0t0  TCP localhost:40129 (LISTEN)
    java      19680 nexus  733u  IPv4 301293      0t0  TCP *:afs3-callback (LISTEN)
    sshd      31905  root    3u  IPv4 508853      0t0  TCP localhost:ssh->172.10.116.232:15966 (ESTABLISHED)
    sshd      32138  root    3u  IPv4 512855      0t0  TCP localhost:ssh->172.11.247.123:10033 (ESTABLISHED)
    sshd      32159  root    3u  IPv4 513093      0t0  TCP localhost:ssh->172.11.247.123:10106 (ESTABLISHED)
    

    1.2 按tcp查

    查看所有tcp端口情况

    [root@localhost ~]# lsof -i tcp
    COMMAND     PID  USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
    AliYunDun  1053  root   21u  IPv4 307323      0t0  TCP localhost:43876->100.100.30.25:http (ESTABLISHED)
    sshd       1162  root    3u  IPv4  14660      0t0  TCP *:ssh (LISTEN)
    java      19680 nexus   82u  IPv4 300159      0t0  TCP localhost:40129 (LISTEN)
    java      19680 nexus  733u  IPv4 301293      0t0  TCP *:afs3-callback (LISTEN)
    sshd      31905  root    3u  IPv4 508853      0t0  TCP localhost:ssh->172.10.116.232:15966 (ESTABLISHED)
    sshd      32138  root    3u  IPv4 512855      0t0  TCP localhost:ssh->172.11.247.123:10033 (ESTABLISHED)
    sshd      32159  root    3u  IPv4 513093      0t0  TCP localhost:ssh->172.11.247.123:10106 (ESTABLISHED)
    [root@localhost ~]# lsof -i tcp:7001
    COMMAND   PID  USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
    java    19680 nexus  733u  IPv4 301293      0t0  TCP *:afs3-callback (LISTEN)
    

    只查看7001端口情况

    [root@localhost ~]# lsof -i tcp:7001
    COMMAND   PID  USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
    java    19680 nexus  733u  IPv4 301293      0t0  TCP *:afs3-callback (LISTEN)
    

    1.3 按udp查

    与tcp一样的用法

    [root@localhost ~]# lsof -i udp
    COMMAND  PID USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
    dhclient 707 root    6u  IPv4  12256      0t0  UDP *:bootpc 
    dhclient 707 root   20u  IPv4  12211      0t0  UDP *:52171 
    dhclient 707 root   21u  IPv6  12212      0t0  UDP *:cgms 
    ntpd     799  ntp   16u  IPv4  13267      0t0  UDP *:ntp 
    ntpd     799  ntp   17u  IPv6  13268      0t0  UDP *:ntp 
    ntpd     799  ntp   18u  IPv4  13273      0t0  UDP localhost:ntp 
    ntpd     799  ntp   19u  IPv4  13274      0t0  UDP localhost:ntp 
    [root@localhost ~]# lsof -i udp:123
    COMMAND PID USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
    ntpd    799  ntp   16u  IPv4  13267      0t0  UDP *:ntp 
    ntpd    799  ntp   17u  IPv6  13268      0t0  UDP *:ntp 
    ntpd    799  ntp   18u  IPv4  13273      0t0  UDP localhost:ntp 
    ntpd    799  ntp   19u  IPv4  13274      0t0  UDP localhost:ntp
    

    1.4 按协议类型查

    ipv4或ipv6

    [root@localhost ~]# lsof -i 4
    COMMAND     PID  USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
    dhclient    707  root    6u  IPv4  12256      0t0  UDP *:bootpc 
    dhclient    707  root   20u  IPv4  12211      0t0  UDP *:52171 
    ntpd        799   ntp   16u  IPv4  13267      0t0  UDP *:ntp 
    ntpd        799   ntp   18u  IPv4  13273      0t0  UDP localhost:ntp 
    ntpd        799   ntp   19u  IPv4  13274      0t0  UDP localhost:ntp 
    AliYunDun  1053  root   21u  IPv4 307323      0t0  TCP localhost:43876->100.100.30.25:http (ESTABLISHED)
    sshd       1162  root    3u  IPv4  14660      0t0  TCP *:ssh (LISTEN)
    java      19680 nexus   82u  IPv4 300159      0t0  TCP localhost:40129 (LISTEN)
    java      19680 nexus  733u  IPv4 301293      0t0  TCP *:afs3-callback (LISTEN)
    sshd      31905  root    3u  IPv4 508853      0t0  TCP localhost:ssh->172.10.116.232:15966 (ESTABLISHED)
    sshd      32138  root    3u  IPv4 512855      0t0  TCP localhost:ssh->172.11.247.123:10033 (ESTABLISHED)
    sshd      32159  root    3u  IPv4 513093      0t0  TCP localhost:ssh->172.11.247.123:10106 (ESTABLISHED)
    [root@localhost ~]# lsof -i 6
    COMMAND  PID USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
    dhclient 707 root   21u  IPv6  12212      0t0  UDP *:cgms 
    ntpd     799  ntp   17u  IPv6  13268      0t0  UDP *:ntp
    

    1.5 按端口查

    如22端口

    [root@localhost ~]# lsof -i :22
    COMMAND   PID USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
    sshd     1162 root    3u  IPv4  14660      0t0  TCP *:ssh (LISTEN)
    sshd    31905 root    3u  IPv4 508853      0t0  TCP localhost:ssh->172.10.116.232:15966 (ESTABLISHED)
    sshd    32138 root    3u  IPv4 512855      0t0  TCP localhost:ssh->172.11.247.123:10033 (ESTABLISHED)
    sshd    32159 root    3u  IPv4 513093      0t0  TCP localhost:ssh->172.11.247.123:10106 (ESTABLISHED)
    

    没使用的端口没有查询信息

    [root@localhost ~]# lsof -i :8090
    [root@localhost ~]#
    

    1.6 按用户查

    如nexus用户

    [root@localhost ~]# lsof -a -u nexus -i
    COMMAND   PID  USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
    java    19680 nexus   82u  IPv4 300159      0t0  TCP localhost:40129 (LISTEN)
    java    19680 nexus  733u  IPv4 301293      0t0  TCP *:afs3-callback (LISTEN)
    

 

  • netstat

    netstat 命令用于显示网络状态,系统默认都装有该命令,下文主要介绍端口常用操作。

    1. netstat -anp | grep ":22"

    查看22端口

    [root@localhost ~]# netstat -anp | grep ":22"
    tcp        0      0 0.0.0.0:22              0.0.0.0:*                   LISTEN      1162/sshd           
    tcp        0      0 172.9.204.26:22        172.10.116.232:15966     ESTABLISHED 31905/sshd: root@pt 
    tcp        0      0 172.9.204.26:22        172.11.247.123:10106     ESTABLISHED 32159/sshd: root@pt 
    tcp        0     52 172.9.204.26:22        172.11.247.123:10033   ESTABLISHED 32138/sshd: root@pt
    
    1. netstat -tunplp

    所有端口

    [root@localhost ~]# netstat -tunplp
    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      1162/sshd           
    tcp        0      0 0.0.0.0:7001            0.0.0.0:*               LISTEN      19680/java          
    tcp        0      0 127.0.0.1:40129         0.0.0.0:*               LISTEN      19680/java          
    udp        0      0 0.0.0.0:52171           0.0.0.0:*                           707/dhclient        
    udp        0      0 0.0.0.0:68              0.0.0.0:*                           707/dhclient        
    udp        0      0 172.9.204.26:123       0.0.0.0:*                           799/ntpd            
    udp        0      0 127.0.0.1:123           0.0.0.0:*                           799/ntpd            
    udp        0      0 0.0.0.0:123             0.0.0.0:*                           799/ntpd            
    udp6       0      0 :::3003                 :::*                                707/dhclient        
    udp6       0      0 :::123                  :::*                                799/ntpd
    
    1. netstat -tunplp | grep ":22"

    22端口

    [root@localhost ~]# netstat -tunplp | grep ":22"
    tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      1162/sshd
    

 

posted @ 2020-06-18 00:56  别名  阅读(5138)  评论(0编辑  收藏  举报