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https://github.com/k3s-io/k3s.git
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2705431d96
* Add support for dual-stack cluster/service CIDRs and node addresses Signed-off-by: Brad Davidson <brad.davidson@rancher.com>
51 lines
1.4 KiB
Go
51 lines
1.4 KiB
Go
// +build !windows
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package syssetup
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import (
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"io/ioutil"
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"os"
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"os/exec"
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"github.com/sirupsen/logrus"
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)
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func loadKernelModule(moduleName string) {
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if _, err := os.Stat("/sys/module/" + moduleName); err == nil {
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logrus.Info("Module " + moduleName + " was already loaded")
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return
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}
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if err := exec.Command("modprobe", moduleName).Run(); err != nil {
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logrus.Warn("Failed to start " + moduleName + " module")
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}
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}
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func enableSystemControl(file string) {
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if err := ioutil.WriteFile(file, []byte("1"), 0640); err != nil {
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logrus.Warnf("Failed to write value 1 at "+file+": %v", err)
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}
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}
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func Configure(enableIPv6 bool) {
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loadKernelModule("overlay")
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loadKernelModule("nf_conntrack")
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loadKernelModule("br_netfilter")
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loadKernelModule("iptable_nat")
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if enableIPv6 {
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loadKernelModule("ip6table_nat")
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}
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// Kernel is inconsistent about how devconf is configured for
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// new network namespaces between ipv4 and ipv6. Make sure to
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// enable forwarding on all and default for both ipv4 and ipv6.
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enableSystemControl("/proc/sys/net/ipv4/conf/all/forwarding")
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enableSystemControl("/proc/sys/net/ipv4/conf/default/forwarding")
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enableSystemControl("/proc/sys/net/bridge/bridge-nf-call-iptables")
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if enableIPv6 {
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enableSystemControl("/proc/sys/net/ipv6/conf/all/forwarding")
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enableSystemControl("/proc/sys/net/ipv6/conf/default/forwarding")
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enableSystemControl("/proc/sys/net/bridge/bridge-nf-call-ip6tables")
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}
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}
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