ss的含义 Socket State
1 查看链接
[admin@v035114 ~]$ ss
State Recv-Q Send-Q Local Address:Port Peer Address:Port
ESTAB 0 0 10.232.35.114:43583 10.235.171.2:15888
ESTAB 0 0 10.232.35.114:1023 10.232.16.13:nfs
ESTAB 0 0 10.232.35.114:54487 10.232.36.75:ssh
ESTAB 0 0 10.232.35.114:33943 10.235.171.1:13888
SYN-SENT 0 1 10.232.35.114:37613 10.232.14.220:webcache
ESTAB 0 0 10.232.35.114:34337 10.232.17.73:ssh
ESTAB 0 0 10.232.35.114:44849 10.232.36.86:ssh
ESTAB 1392 0 10.232.35.114:59068 10.20.142.112:ssh
ESTAB 0 0 10.232.35.114:38479 10.232.36.88:ssh
ESTAB 0 0 10.232.35.114:60156 10.232.36.88:ssh
ESTAB 0 0 10.232.35.114:51222 10.232.36.86:ssh
ESTAB 0 0 ::ffff:10.232.35.114:ssh ::ffff:10.13.44.35:ccmad
ESTAB 0 0 ::ffff:10.232.35.114:ssh ::ffff:10.13.44.34:65432
ESTAB 0 0 ::ffff:10.232.35.114:ssh ::ffff:10.13.44.34:50906
ESTAB 0 0 ::ffff:10.232.35.114:ssh ::ffff:10.13.44.34:51239
ESTAB 0 0 ::ffff:10.232.35.114:ssh ::ffff:10.13.44.34:53277
ESTAB 0 0 ::ffff:10.232.35.114:ssh ::ffff:10.13.44.34:50813 第一列表示状态
第二列和第三列的Send-Q和Recv-Q含义
Send-Q 对方没有收到的数据或者说没有Ack的，还是本地缓冲区。
count of bytes not acknowledged by the remote host.
Recv -Q 数据已经在本地接收缓冲，但是还没有recv()
The count of bytes not copied by the user program connected to this socket.
2 选项-n表示不解析服务名
[admin@v035114 ~]$ ss -n
State Recv-Q Send-Q Local Address:Port Peer Address:Port
ESTAB 0 0 10.232.35.114:43583 10.235.171.2:15888
ESTAB 0 0 10.232.35.114:33943 10.235.171.1:13888
ESTAB 1392 0 10.232.35.114:59068 10.20.142.112:22
ESTAB 0 0 10.232.35.114:60156 10.232.36.88:22
ESTAB 0 0 10.232.35.114:51222 10.232.36.86:22
ESTAB 0 0 ::ffff:10.232.35.114:22 ::ffff:10.13.44.35:3114
ESTAB 0 0 ::ffff:10.232.35.114:22 ::ffff:10.13.44.34:50813 端口22对应ssh
3 ss -l 显示本地打开的所有监听端口
[admin@v035114 ~]$ ss -l
Recv-Q Send-Q Local Address:Port Peer Address:Port
0 0 127.0.0.1:15777 *:*
0 0 127.0.0.1:15778 *:*
0 0 127.0.0.1:smux *:*
0 0 *:50410 *:*
0 0 *:netbios-ssn *:*
0 0 *:sunrpc *:*
0 0 *:http *:*
0 0 *:43698 *:*
0 0 *:socks *:*
0 0 *:microsoft-ds *:*
0 0 :::ssh :::* 使用-n看看服务使用的端口
[admin@v035114 ~]$ ss -ln
Recv-Q Send-Q Local Address:Port Peer Address:Port
0 0 127.0.0.1:15777 *:*
0 0 127.0.0.1:15778 *:*
0 0 127.0.0.1:199 *:*
0 0 *:50410 *:*
0 0 *:139 *:*
0 0 *:111 *:*
0 0 *:80 *:*
0 0 *:43698 *:*
0 0 *:1080 *:*
0 0 *:445 *:*
0 0 :::22 :::* 22 对应ssh
80 对应http
111 对应sunrpc
139 对应netbios-ssn
4 -s 摘要
[admin@v035114 ~]$ ss -s
Total: 89 (kernel 114)
TCP: 44 (estab 9, closed 23, orphaned 0, synrecv 0, timewait 22/0), ports 80
Transport Total IP IPv6
* 114 - -
RAW 0 0 0
UDP 16 13 3
TCP 21 17 4
INET 37 30 7
FRAG 0 0 0 orphaned什么意思？
最后的 ports 80 什么意思？
RAW、INET、FRAG什么意思？
IPv6 那一 列有好几行数值不为0 设么意思？
5 -t 显示TCP连接
[admin@v035114 ~]$ ss -t
State Recv-Q Send-Q Local Address:Port Peer Address:Port
ESTAB 0 0 10.232.35.114:59861 10.235.144.41:ssh
ESTAB 0 0 10.232.35.114:43583 10.235.171.2:15888
ESTAB 0 0 10.232.35.114:33943 10.235.171.1:13888
ESTAB 1392 0 10.232.35.114:59068 10.20.142.112:ssh
ESTAB 0 0 10.232.35.114:60156 10.232.36.88:ssh
ESTAB 0 0 10.232.35.114:51222 10.232.36.86:ssh
ESTAB 0 0 ::ffff:10.232.35.114:ssh ::ffff:10.13.44.35:ccmad
ESTAB 0 0 ::ffff:10.232.35.114:ssh ::ffff:10.13.44.34:50813
ESTAB 0 0 ::ffff:10.232.35.114:ssh ::ffff:10.13.44.50:54354 6 -u显示UDP连接
[admin@v035114 ~]$ ss -t
State Recv-Q Send-Q Local Address:Port Peer Address:Port
ESTAB 0 0 10.232.35.114:59861 10.235.144.41:ssh
ESTAB 0 0 10.232.35.114:43583 10.235.171.2:15888
ESTAB 0 0 10.232.35.114:33943 10.235.171.1:13888
ESTAB 1392 0 10.232.35.114:59068 10.20.142.112:ssh
ESTAB 0 0 10.232.35.114:60156 10.232.36.88:ssh
ESTAB 0 0 10.232.35.114:51222 10.232.36.86:ssh
ESTAB 0 0 ::ffff:10.232.35.114:ssh ::ffff:10.13.44.35:ccmad
ESTAB 0 0 ::ffff:10.232.35.114:ssh ::ffff:10.13.44.34:50813
ESTAB 0 0 ::ffff:10.232.35.114:ssh ::ffff:10.13.44.50:54354 7 -p显示使用socket的pid，第一次使用这个命令就是利用-p选项找java的pid，然后jstack java进程， ss -p | grep "db-ip"
[admin@v035114 ~]$ ss -p
State Recv-Q Send-Q Local Address:Port Peer Address:Port
ESTAB 0 0 10.232.35.114:59861 10.235.144.41:ssh users:(("ssh",20182,3))
ESTAB 0 0 10.232.35.114:43583 10.235.171.2:15888
ESTAB 0 0 10.232.35.114:33943 10.235.171.1:13888
ESTAB 1392 0 10.232.35.114:59068 10.20.142.112:ssh users:(("ssh",19281,3))
SYN-SENT 0 1 10.232.35.114:46842 10.232.14.220:webcache
ESTAB 0 0 10.232.35.114:60156 10.232.36.88:ssh users:(("ssh",10249,3))
ESTAB 0 0 10.232.35.114:51222 10.232.36.86:ssh users:(("ssh",10346,3))
ESTAB 0 0 ::ffff:10.232.35.114:ssh ::ffff:10.13.44.35:ccmad
ESTAB 0 180 ::ffff:10.232.35.114:ssh ::ffff:10.13.44.34:50813
ESTAB 0 0 ::ffff:10.232.35.114:ssh ::ffff:10.13.44.50:54354 括号里面第3位不知道什么意思？
最后一行的::fffff:是什么意思？
8 -o显示定时器信息
[admin@v035114 ~]$ ss -o
State Recv-Q Send-Q Local Address:Port Peer Address:Port
ESTAB 0 0 10.232.35.114:59861 10.235.144.41:ssh timer:(keepalive,21min,0)
ESTAB 0 0 10.232.35.114:43583 10.235.171.2:15888
ESTAB 0 0 10.232.35.114:33943 10.235.171.1:13888 timer:(keepalive,6.248ms,0)
ESTAB 1392 0 10.232.35.114:59068 10.20.142.112:ssh timer:(keepalive,19min,0)
SYN-SENT 0 1 10.232.35.114:56005 10.232.14.220:webcache timer:(on,1.092ms,0)
ESTAB 0 0 10.232.35.114:60156 10.232.36.88:ssh timer:(keepalive,32min,0)
ESTAB 0 0 10.232.35.114:51222 10.232.36.86:ssh timer:(keepalive,30min,0)
ESTAB 0 0 ::ffff:10.232.35.114:ssh ::ffff:10.13.44.35:ccmad timer:(keepalive,11min,0)
ESTAB 0 0 ::ffff:10.232.35.114:ssh ::ffff:10.13.44.34:50813 timer:(keepalive,18min,0)
ESTAB 0 0 ::ffff:10.232.35.114:ssh ::ffff:10.13.44.50:54354 timer:(keepalive,21min,0)看到两个类型的timer，都不知道什么意思？
on
keepalive
9 -i 显示内部TCP信息，只打印后几列
[admin@v035114 ~]$ ss -i
Local Address:Port Peer Address:Port
10.232.35.114:59861 10.235.144.41:ssh rto:0.212 ato:0.04 cwnd:3 ssthresh:100 qack:11
10.232.35.114:43583 10.235.171.2:15888 rto:0.204 ato:0.04 cwnd:3 ssthresh:100
10.232.35.114:33943 10.235.171.1:13888 rto:0.212 ato:0.04 cwnd:3 ssthresh:100
10.232.35.114:59068 10.20.142.112:ssh rto:0.212 ato:0.04 cwnd:20 ssthresh:100
10.232.35.114:43376 10.232.14.220:webcache
10.232.35.114:60156 10.232.36.88:ssh rto:0.204 ato:0.04 ssthresh:100 bidir
10.232.35.114:51222 10.232.36.86:ssh rto:0.204 ato:0.04 cwnd:3 ssthresh:100
::ffff:10.232.35.114:ssh ::ffff:10.13.44.35:ccmad rto:0.256 ato:0.04 cwnd:3 ssthresh:3 qack:14
::ffff:10.232.35.114:ssh ::ffff:10.13.44.34:50813 rto:0.476 ato:0.04 cwnd:5 ssthresh:100 bidir
::ffff:10.232.35.114:ssh ::ffff:10.13.44.50:54354 rto:0.316 ato:0.04 cwnd:4 ssthresh:100 qack:1
rto
ato
cwnd
ssthresh 都是什么意思啊？
10 Filter过滤的例子
ss -o state established '( dport = :smtp or sport = :smtp )'
ss -o state established '( dport = :http or sport = :http )'
