Hi folks,
I have here a database node running
# rpm -qa | grep mysql-server
mysql55-mysql-server-5.5.52-1.el6.x86_64
on
# virt-what
vmware
that seems to have a connection problem:
# dmesg |grep SYN |tail -5
possible SYN flooding on port 3306. Sending cookies.
possible SYN flooding on port 3306. Sending cookies.
possible SYN flooding on port 3306. Sending cookies.
possible SYN flooding on port 3306. Sending cookies.
possible SYN flooding on port 3306. Sending cookies.
I adapted already following:
# sysctl -a |grep -E 'maxconn|syn_backlog'
net.core.somaxconn = 2048
net.ipv4.tcp_max_syn_backlog = 2048
but ListenOverflows and ListenDrops values are still high
# cat /proc/net/netstat | awk '{print $21 "-" $22 }'
ListenOverflows-ListenDrops
13568-13568
any suggestion?
--
Thanks,
LF
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