Linux ss(Socket Statistics)

ss命令可以用来获取socket统计信息，它可以显示和netstat类似的内容。但ss的优势在于它能够显示更多更详细的有关TCP和连接状态的信息，而且比netstat更快速更高效。

Socket类型:

  1. DCCP Socket : Datagram Congestion Control Protocol (DCCP).
  2. Raw Socket : (Raw IP sockets), typically available in routers and other network equipment. Here the transport layer is bypassed, and the packet headers are made accessible to the application
  3. Unix domain socket : A Unix domain socket or IPC socket (inter-process communication socket) is a data communications endpoint for exchanging data between processes executing on the same host operating system. Like named pipes, Unix domain sockets support transmission of a reliable stream of bytes (SOCK_STREAM, compare to TCP). In addition, they support ordered and reliable transmission of datagrams (SOCK_SEQPACKET), or unordered and unreliable transmission of datagrams (SOCK_DGRAM, compare to UDP). The Unix domain socket facility is a standard component of POSIX operating systems.
  4. 查看各种状态的TCP连接数量和 netstat -aonp | grep tcp| wc -l

ss -ta | wc -l

References

  1. 每天一个linux命令（57）：ss命令
  2. ss man page

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