Shulou(Shulou.com)06/01 Report--

CentOS how to modify the size of the system HASHSIZE, many novices are not very clear about this, in order to help you solve this problem, the following small series will explain in detail for everyone, there are people who need this can learn, I hope you can gain something.

After starting CentOS, edit the/etc/modprobe.conf file directly and add a line to the *** side:

options ip_conntrack hashsize=100000

If you are using a CentOS system that is a previous version of Fedora or another Linux distribution, you may also need to add

options nf_conntrack hashsize=100000

This depends on whether the module name in your CentOS system is ip_conntrack or nf_conntrack, and I am confused by the different module names. Put Fedora's writing into CentOS, the result is how to restart HASHSIZE value is not changed, later after ELM reminder, you can also check the module list through lsmod to see whether your module is ip_conntrack or nf_conntrack, only to find that CentOS module called ip_conntrack, and in Fedora this module is called nf_conntrack.

[root@proxy proc]# lsmod | grep conn

ip_conntrack_netbios_ns 6977 0

ip_conntrack 53281 4 ip_conntrack_netbios_ns,iptable_nat,ip_nat,xt_state

nfnetlink 10713 2 ip_nat,ip_conntrack

Restart CentOS after the modification, and then you can see that your hashsize value has been changed.

[root@proxy proc]# more /proc/sys/net/ipv4/netfilter/ip_conntrack_buckets

100000

[root@proxy proc]# more /proc/sys/net/ipv4/netfilter/ip_conntrack_max

800000

After this modification, there is no need to modify the ip_conntrack_max value additionally. The ip_conntrack_max value will be automatically set to 8 times the HASHSIZE value.

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