Tune the host OS for container workloads: kernel params, I/O, and cgroups.
Node-level tuning improves container density and latency. Focus on kernel, I/O, and cgroups.
# /etc/sysctl.d/99-kubernetes.conf
net.ipv4.ip_forward = 1
net.bridge.bridge-nf-call-iptables = 1
net.bridge.bridge-nf-call-ip6tables = 1
vm.max_map_count = 262144
fs.inotify.max_user_watches = 524288
Adjust per workload; document any custom values.
Tuning pays off most when combined with good app design and resource requests.
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