How do I view the listen backlog of a TCP socket?

Solution Verified - Updated -

Issue

  • How do I view the size of the backlog of a tcp socket in "LISTEN" state?
  • How can I see the current and maximum count of handshaken TCP connections waiting in the listen() backlog of a socket waiting to have accept() called on them?
  • How can I tell if increasing net.core.somaxconn and listen(int sockfd, int backlog); has worked?

Environment

  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 6
  • TCP connections in LISTEN state

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