Linux shell 的ss
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 )' 显示所有已建立的SMTP连接
ss -o state established '( dport = :http or sport = :http )' 显示所有已建立的HTTP连接