Beta Branch revised TCP tuning for nf_conntrack max and hash size in 123.09beta01

revised TCP tuning for nf_conntrack max and hash size in 123.09beta01

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dynamic tuning based on server environment memory installed & cpu cache size detection

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123.09beta01 branch

• Branch: https://github.com/centminmod/centminmod/tree/123.09beta01
• Commit History: https://github.com/centminmod/centminmod/commits/123.09beta01

 

these changes don't effect csf settings

But right now, updating 123.09beta01 won't sync the changes with your existing install. You could trigger these changes by doing either of the following

for CentOS 7

1. save locally a backup copy of /etc/sysctl.d/101-sysctl.conf
2. delete /etc/sysctl.d/101-sysctl.conf
3. edit /etc/rc.local and remove hardcoded lined if it exists
   Code (Text):

   echo 65536 > /sys/module/nf_conntrack/parameters/hashsize

4. re-run updated 123.09beta01's centmin.sh
5. verify that /etc/sysctl.d/101-sysctl.conf is re-created and you can compare with backup copy with updated /etc/sysctl.d/101-sysctl.conf
6. verify /etc/rc.local has new updated line for /sys/module/nf_conntrack/parameters/hashsize (note it's only added if /sys/module/nf_conntrack/parameters/hashsize actually exists)
7. if you added any custom settings in /etc/sysctl.d/101-sysctl.conf or /etc/sysctl.conf, re-add them back from backup copy to system /etc/sysctl.d/101-sysctl.conf

for CentOS 6

1. save locally a backup copy of /etc/sysctl.conf
2. edit /etc/sysctl.conf and remove lines starting and inclusive from centminmod added line
3. edit /etc/rc.local and remove hardcoded lined if it exists
   Code (Text):

   echo 65536 > /sys/module/nf_conntrack/parameters/hashsize

   
   
4. re-run updated 123.09beta01's centmin.sh
5. verify in /etc/sysctl.conf that new lines have been added and compare to backup /etc/sysctl.conf
6. verify /etc/rc.local has new updated line for /sys/module/nf_conntrack/parameters/hashsize (note it's only added if /sys/module/nf_conntrack/parameters/hashsize actually exists)
7. if you added any custom settings in /etc/sysctl.conf, re-add them back from backup copy to system /etc/sysctl.conf