[CentOS] Modify Parameters at system boot

Fri May 13 11:04:48 UTC 2011
Marian Marinov <mm at yuhu.biz>

On Friday 13 May 2011 07:04:33 Frederick Abrams wrote:
> Hi all.
> 
> i'm trying to modify some parameters but when system reboots it doesn't
> load. For the sysctl if I run sysctl -p then it changes
> 
> /etc/sysctl.conf
>      net.ipv4.netfilter.ip_conntrack_max = 1048576
> 
> /etc/modprobe.conf
>      options ip_conntrack hashsize=131072
> 
> after reboot results
> 
> cat /proc/sys/net/ipv4/netfilter/ip_conntrack_max
> 65536
> 
> cat /sys/module/nf_conntrack/parameters/hashsize
> 16384
> 
> expected results
> 
> cat /proc/sys/net/ipv4/netfilter/ip_conntrack_max
> 1048576
> 
> cat /sys/module/nf_conntrack/parameters/hashsize
> 131072
> 

It is possible that your iptables modules are loaded after the sysctl.conf is 
executed.
Keep in mind that sysctl.conf is loaded during network startup. 

About the options... at least with kernel  2.6.18.0194.el5 the right option 
is:

options ipt_hashsize 131072

Also keep in mind that you have to remove the '=' sign from modprobe.conf 

Marian
-- 
Best regards,
Marian Marinov
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