点滴记忆---观雨亭
【Linux 运维】查看网络连接状态信息之netstat和ss命令详解[转]
2020-7-28 eehello

转载自:https://www.cnblogs.com/yangleitao/p/9583280.html

一、netstat 常用命令详解

通过man netstat可以查看netstat的帮助信息:


[root@web129 ~]# netstat 选项
选项:
    -a:  列出系统中所有网络连接,包括已经连接的网络服务、监听的网络服务和Socket套接字        
    -t:  列出TCP数据    -u:  列出UDP数据
    -l:  列出正在监听的网络服务(不包含已经连接的网路服务)
    -n:  用端口显示服务,而不用服务名
    -p:  列出该服务的进程ID(PID)



示例一:netstat -tlunp


[root@web129 ~]# netstat -tlunp
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      1490/sshd           
tcp        0      0 127.0.0.1:25            0.0.0.0:*               LISTEN      1989/master         
tcp6       0      0 :::80                   :::*                    LISTEN      852/httpd           
tcp6       0      0 :::22                   :::*                    LISTEN      1490/sshd           
tcp6       0      0 ::1:25                  :::*                    LISTEN      1989/master         
udp        0      0 127.0.0.1:323           0.0.0.0:*                           524/chronyd         
udp6       0      0 ::1:323                 :::*                                524/chronyd         
[root@web129 ~]#

 




实例二:使用netstat -an

[root@web129 ~]# netstat -an
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address           Foreign Address         State      
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN     
tcp        0      0 127.0.0.1:25            0.0.0.0:*               LISTEN     
tcp        0      0 192.168.19.129:22       192.168.19.1:1108       ESTABLISHED
tcp        0      0 192.168.19.129:22       192.168.19.1:2301       ESTABLISHED
tcp6       0      0 :::80                   :::*                    LISTEN     
tcp6       0      0 :::22                   :::*                    LISTEN     
tcp6       0      0 ::1:25                  :::*                    LISTEN     
udp        0      0 127.0.0.1:323           0.0.0.0:*                          
udp        0      0 192.168.19.129:39366    85.199.214.101:123      ESTABLISHED
udp        0      0 192.168.19.129:39060    85.199.214.100:123      ESTABLISHED
udp6       0      0 ::1:323                 :::*                               
Active UNIX domain sockets (servers and established)
Proto RefCnt Flags       Type       State         I-Node   Path
unix  2      [ ACC ]     STREAM     LISTENING     25859    /run/docker/libnetwork/2607d31c4b65ff68cf08c24cc6d5e4687dad654f9ec402872e98f8dcc79f448f.sock
unix  2      [ ACC ]     STREAM     LISTENING     24960    private/rewrite



执行结果,除了上文的参数之外,还有Socket内容:


二、ss命令详解

ss是Socket Statistics的缩写

使用场景一:查看当前服务器的网络连接数

[root@web129 ~]# ss -s
Total: 580 (kernel 1020)
TCP:   8 (estab 2, closed 1, orphaned 0, synrecv 0, timewait 0/0), ports 0

Transport Total     IP        IPv6
*      1020      -         -        
RAW      0         0         0        
UDP      4         3         1        
TCP      7         4         3        
INET      11        7         4        
FRAG      0         0         0



使用场景2:查看所有打开的网络端口

[root@web129 ~]# ss -l
Netid State      Recv-Q Send-Q           Local Address:Port                            Peer Address:Port                
nl    UNCONN     0      0                         rtnl:1736442360                                  *                     
nl    UNCONN     768    0                         rtnl:dockerd/853                                 *                     
nl    UNCONN     0      0                         rtnl:kernel                                      *                     
nl    UNCONN     0      0                         rtnl:1736442360                                  *                     
nl    UNCONN     4352   0                      tcpdiag:ss/4865                                     *                     
nl    UNCONN     768    0                      tcpdiag:kernel                                      *                     
nl    UNCONN     0      0                         xfrm:kernel                                      *                     
nl    UNCONN     0      0                         xfrm:dockerd/853                                 *                     
nl    UNCONN     0      0                      selinux:kernel                                      *    
[root@web129 ~]# ss -pl  #列出具体的程序名字
Netid State      Recv-Q Send-Q           Local Address:Port                            Peer Address:Port                
nl    UNCONN     0      0                         rtnl:1736442360                                  *                     
nl    UNCONN     768    0                         rtnl:dockerd/853                                 *        
tcp LISTEN 0 128 :::http :::* users:(("httpd",pid=2493,fd=4),("httpd",pid=2492,fd=4),("httpd",pid=2491,fd=4),("httpd",pid=2490,fd=4),("httpd",pid=2489,fd=4),("httpd",pid=852,fd=4))
tcp   LISTEN     0      128                         :::ssh                                       :::*


使用场景3:查看这台服务器上所有的Socket 连接


[root@web129 ~]# ss -a   #列出所有网络连接
Netid State      Recv-Q Send-Q           Local Address:Port                            Peer Address:Port                
nl    UNCONN     0      0                         rtnl:1736442360                                  *                     
nl    UNCONN     768    0                         rtnl:dockerd/853                                 *                     
nl    UNCONN     0      0                         rtnl:kernel                                      *                     
nl    UNCONN     0      0                         rtnl:1736442360                                  *        
[root@web129 ~]# ss -ta   #查看TCP socket
State       Recv-Q Send-Q             Local Address:Port                              Peer Address:Port                
LISTEN      0      128                            *:ssh                                          *:*                    
LISTEN      0      100                    127.0.0.1:smtp                                         *:*                    
ESTAB       0      0                 192.168.19.129:ssh                               192.168.19.1:ratio-adp            
ESTAB       0      0                 192.168.19.129:ssh                               192.168.19.1:cpq-wbem             
LISTEN      0      128                           :::http                                        :::*                    
LISTEN      0      128                           :::ssh                                         :::*                    
LISTEN      0      100                          ::1:smtp                                        :::*                    
[root@web129 ~]# ss -ua   #查看UDP  Socket
State       Recv-Q Send-Q             Local Address:Port                              Peer Address:Port                
UNCONN      0      0                      127.0.0.1:323                                          *:*                    
ESTAB       0      0                 192.168.19.129:53193                            185.134.197.4:ntp                  
ESTAB       0      0                 192.168.19.129:55294                           193.228.143.12:ntp                  
ESTAB       0      0                 192.168.19.129:49316                           85.199.214.101:ntp                  
UNCONN      0      0                            ::1:323                                         :::*                    
[root@web129 ~]# 
[root@web129 ~]# ss -wa   #查看RAW socket
State       Recv-Q Send-Q             Local Address:Port                              Peer Address:Port      
[root@web129 ~]# ss -xa   #查看UNIX socket
Netid State      Recv-Q Send-Q           Local Address:Port                            Peer Address:Port                
u_str LISTEN     0      128    /run/docker/libnetwork/2607d31c4b65ff68cf08c24cc6d5e4687dad654f9ec402872e98f8dcc79f448f.sock 25859                                      * 0                    
u_str LISTEN     0      100            private/rewrite 24960                                      * 0                    
u_str LISTEN     0      100             private/bounce 24963                                      * 0                    
u_str LISTEN     0      100              private/defer 24966                                      * 0                    
u_str LISTEN     0      100              private/trace 24969                                      * 0


三、netstat和ss之间替换命令

1、命令替换

2、软件包替换





评论:
海安人才网
2020-08-19 17:07 回复
不错!我也保存下
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