Shulou(Shulou.com)06/01 Report--

In TIME_WAIT, the bind port will fail after modifying the socket option, even if you are using SO_REUSEADDR or SO_REUSEPORT mode

* *

Tcp 0 0 127.0.0.1:81 127.0.0.1:56850 TIME_WAIT

* *

Tcp 0 0 127.0.0.1:81 127.0.0.1:56850 TIME_WAIT

* *

Tcp 0 0 127.0.0.1:81 127.0.0.1:56850 TIME_WAIT

* *

Tcp 0 0 127.0.0.1:81 127.0.0.1:56850 TIME_WAIT

As mentioned above, after the process exits, as long as TIME_WAIT still exists (only disappears after 2MSL), switching the socket option to the bind port will not be successful, such as SO_REUSEADDR and SO_REUSEPORT mode change.

The solution is to set all three variables of tcp_timestamp,tcp_reuse,tcp_recycle to 1 so that TIME_WAIT can be quickly recycled after the process exits.

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