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Editorial Team
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Asked: 2026-06-01T15:06:14+00:00

If we must connect the db (redis)every time we need to write to or

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If we must connect the db (redis)every time we need to write to or read from the db .After some operates then close the connection . Because the connect is frequently (assume the case must connect and then close) .As a result ,Too many TIME_WAIT state socket stay in kernel.
some thing like :

`netstat -vatnl | grep 6379

tcp        0      0 127.0.0.1:6379              0.0.0.0:*                   LISTEN         
tcp        0      0 127.0.0.1:36476             127.0.0.1:6379              TIME_WAIT   
tcp        0      0 127.0.0.1:37193             127.0.0.1:6379            ESTABLISHED 
tcp        0      0 127.0.0.1:36480             127.0.0.1:6379              TIME_WAIT   
tcp        0      0 127.0.0.1:36479             127.0.0.1:6379              TIME_WAIT   
tcp        0      0 127.0.0.1:36472             127.0.0.1:6379              TIME_WAIT   
tcp        0      0 127.0.0.1:36457             127.0.0.1:6379              TIME_WAIT   
tcp        0      0 127.0.0.1:36460             127.0.0.1:6379              TIME_WAIT   
tcp        0      0 127.0.0.1:36481             127.0.0.1:6379              TIME_WAIT `
  1. Can we reuse the port in client ? such call bind() before connect() with the sock opt SO_REUSEPORT
  2. sysctl -w net.ipv4.tcp_timestamps=1
    sysctl -w net.ipv4.tcp_tw_recycle=1    <
    This way indeed help a lot .But I can still see many TIME_WAIT state
  3. Set socket opt SO_LINGER l_onoff=0 ; l_liger=1
    or some other ways?
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  1. Editorial Team

    TIME_WAITs are part of tcp protocol tear-down processes. They ensure that packets of old-connection aren’t accepted as part of new-connection. So unless there are 1000s of them should leave them as it is.

    Having said that as source/dest are localhost there shouldn’t be a situation where packets of old-connection can be considered as new-connection’s. Among your proposed solutions 1 can be used. Solutions 2 & 3 may have wider implications, so please check before applying them.

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