Method WithSysctls

pkg/model/resources/nodeup.go:536–546

By setting some sysctls early, we avoid broken configurations that prevent nodeup download. See https://github.com/kubernetes/kops/issues/10206 for details.

()

// By setting some sysctls early, we avoid broken configurations that prevent nodeup download.
// See https://github.com/kubernetes/kops/issues/10206 for details.
func (s *NodeUpScript) WithSysctls() {
	var b bytes.Buffer

	// Based on https://github.com/kubernetes/kops/issues/10206#issuecomment-766852332
	b.WriteString("sysctl -w net.core.rmem_max=16777216 || true\n")
	b.WriteString("sysctl -w net.core.wmem_max=16777216 || true\n")
	b.WriteString("sysctl -w net.ipv4.tcp_rmem='4096 87380 16777216' || true\n")
	b.WriteString("sysctl -w net.ipv4.tcp_wmem='4096 87380 16777216' || true\n")

	s.SetSysctls = b.String()
}