{{tag>Brouillon Réseau Web}}

= Linux pile TCP/IP TIME_WAIT Apache

Voir 
* ''man netstat''
* mode Prefork Vs Worker

<code bash>
ps -efL |grep http | wc -l
</code>

<code bash>
netstat -nat |sed '2d' | awk '{print $6}' | sort | uniq -c | sort -n
</code>

<code ->
      1 Foreign
      4 SYN_RECV
     12 LISTEN
    131 ESTABLISHED
    191 CLOSE_WAIT
    270 TIME_WAIT
</code>

Source: https://www.skyminds.net/serveur-dedie-reduire-les-connexions-time_wait-des-sockets-et-optimiser-tcp/

Ou mieux
<code ->
# ss -s
Total: 281 (kernel 3060)
TCP:   10 (estab 4, closed 0, orphaned 0, synrecv 0, timewait 0/0), ports 0

Transport Total     IP        IPv6
*         3060      -         -
RAW       0         0         0
UDP       2         2         0
TCP       10        7         3
INET      12        9         3
FRAG      0         0         0
</code>


Voir commande **ss**
<code bash>
ss -t4 state time-wait
ss -t4 state established
</code>

Pile TCP/IP
<code ->
cat /proc/sys/net/ipv4/tcp_fin_timeout
0
cat /proc/sys/net/ipv4/tcp_tw_recycle
0
cat /proc/sys/net/ipv4/tcp_tw_reuse
60
</code>

<code bash>
echo 30 > /proc/sys/net/ipv4/tcp_fin_timeout 
echo 1 > /proc/sys/net/ipv4/tcp_tw_recycle
echo 1 > /proc/sys/net/ipv4/tcp_tw_reuse
</code>

<code ->
      1 Foreign
      1 SYN_RECV
     12 LISTEN
     29 CLOSE_WAIT
     58 ESTABLISHED
    217 TIME_WAIT
</code>