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Configuring Conntrack

A common problem on Linux systems is running out of space in the conntrack table, which can cause poor iptables performance. This can happen if you run a lot of workloads on a given host, or if your workloads create a lot of TCP connections or bidirectional UDP streams.

To avoid this becoming a problem, we recommend increasing the conntrack table size. To do so, run the following commands:

sysctl -w net.netfilter.nf_conntrack_max=1000000
echo "net.netfilter.nf_conntrack_max=1000000" >> /etc/sysctl.conf