大話命令之—ss
ss是Socket Statistics的縮寫。顧名思義,ss命令可以用來獲取socket統計信息,它可以顯示和netstat類似的內容。
優勢:
(1)顯示更多更詳細的有關TCP和連接狀態的信息,(2)比netstat更快速更高效。
1 格式
格式:ss [option]… [filter]
netstat 通過遍歷proc來或許socket信息,ss使用netlink與內核tcp_diag模塊通信獲取socket信息
2 選項
-t:tcp 協議相關
-u:udp協議相關
-w:裸套接字相關
-l:listen狀態的連接
-a:所有
-n:數字格式
-p:相關的程序和PID
-e:擴展的信息
-m:內存用量
-o:計時器信息
3 實例
(1)ss -l 顯示本地打開的所有端口
[root@CentOS68 ~]# ss -l State Recv-Q Send-Q Local Address:Port Peer Address:Port LISTEN 0 128 *:60455 *:* LISTEN 0 128 :::sunrpc :::* LISTEN 0 128 *:sunrpc *:* LISTEN 0 128 :::http :::* LISTEN 0 128 :::ssh :::* LISTEN 0 128 *:ssh *:* LISTEN 0 128 127.0.0.1:ipp *:* LISTEN 0 128 ::1:ipp :::* LISTEN 0 100 ::1:smtp :::* LISTEN 0 100 127.0.0.1:smtp *:* LISTEN 0 128 :::39546 :::* [root@CentOS68 ~]#
(2)ss –pl 顯示每個進程具體打開的socket
[root@CentOS68 ~]# ss -pl State Recv-Q Send-Q Local Address:Port Peer Address:Port LISTEN 0 128 *:60455 *:* users:(("rpc.statd",1644,9)) LISTEN 0 128 :::sunrpc :::* users:(("rpcbind",1601,11)) LISTEN 0 128 *:sunrpc *:* users:(("rpcbind",1601,8)) LISTEN 0 128 *:ssh *:* users:(("sshd",1841,3)) LISTEN 0 128 127.0.0.1:ipp *:* users:(("cupsd",1679,7)) LISTEN 0 128 ::1:ipp :::* users:(("cupsd",1679,6)) LISTEN 0 100 ::1:smtp :::* users:(("master",1955,13)) LISTEN 0 100 127.0.0.1:smtp *:* users:(("master",1955,12)) LISTEN 0 128 :::39546 :::* users:(("rpc.statd",1644,11))
(3)-t -a 顯示所有tcp socket
[root@CentOS68 ~]# ss -t -a State Recv-Q Send-Q Local Address:Port Peer Address:Port LISTEN 0 128 *:60455 *:* LISTEN 0 128 :::sunrpc :::* LISTEN 0 128 *:sunrpc *:* LISTEN 0 128 :::http :::* LISTEN 0 128 :::ssh :::* LISTEN 0 128 *:ssh *:* LISTEN 0 128 127.0.0.1:ipp *:* LISTEN 0 128 ::1:ipp :::* LISTEN 0 100 ::1:smtp :::* LISTEN 0 100 127.0.0.1:smtp *:* LISTEN 0 128 :::39546 :::* ESTAB 0 64 192.168.29.68:ssh 192.168.29.1:50541
(4)-u -a 顯示所有的udp socket
[root@CentOS68 ~]# ss -u -a State Recv-Q Send-Q Local Address:Port Peer Address:Port UNCONN 0 0 *:sunrpc *:* UNCONN 0 0 *:39797 *:* UNCONN 0 0 *:ipp *:* UNCONN 0 0 *:928 *:* UNCONN 0 0 *:bootpc *:* UNCONN 0 0 127.0.0.1:972 *:* UNCONN 0 0 :::59503 :::* UNCONN 0 0 :::sunrpc :::* UNCONN 0 0 :::928 :::*
(5)ss -o 顯示所有已建立的連接
[root@CentOS68 ~]# ss -o State Recv-Q Send-Q Local Address:Port Peer Address:Port ESTAB 0 64 192.168.29.68:ssh 192.168.29.1:50541 timer:(on,442ms,0)
原創文章,作者:linux is not unix,如若轉載,請注明出處:http://www.www58058.com/75700