Tuning sysctl.conf

basiaclly just change the values and then run

/sbin/sysctl -p

For example

echo "# Enable TCP SYN Cookie Protection
net.ipv4.tcp_syncookies = 1" > /etc/sysctl.conf
/sbin/sysctl -p

 

Use the sysctl command to alter the settings:

"sysctl -w parameter=new value"

eg: If I want to increase the file descriptors limit, I would run:

sysctl -w fs.file-max=xxxxxx; where xxxxxx is the new value.

 

if I recall correctly that doesnt persist through a reboot though, so you would need to set it in sysctl.conf file if you wanted to make the change persist through a reboot - I could be wrong though, its been known to happen

 

Changes won't be lost upon reboot when you set the values using sysctl-w. But you need to make sure that the same values aren't mentioned in sysctl.conf file.

If you edit sysctl.conf file, run sysctl -p to reflect the changes without rebooting the server.