mirror of https://github.com/k3s-io/k3s
85 lines
2.4 KiB
Go
85 lines
2.4 KiB
Go
/*
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Copyright 2015 The Kubernetes Authors All rights reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package kubelet
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import (
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"bytes"
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"net"
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"os/exec"
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"regexp"
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"github.com/golang/glog"
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)
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var cidrRegexp = regexp.MustCompile(`inet ([0-9a-fA-F.:]*/[0-9]*)`)
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func ensureCbr0(wantCIDR *net.IPNet) error {
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if !cbr0CidrCorrect(wantCIDR) {
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glog.V(2).Infof("Attempting to recreate cbr0 with address range: %s", wantCIDR)
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// delete cbr0
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if err := exec.Command("ip", "link", "set", "dev", "cbr0", "down").Run(); err != nil {
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glog.Error(err)
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return err
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}
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if err := exec.Command("brctl", "delbr", "cbr0").Run(); err != nil {
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glog.Error(err)
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return err
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}
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// recreate cbr0 with wantCIDR
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if err := exec.Command("brctl", "addbr", "cbr0").Run(); err != nil {
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glog.Error(err)
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return err
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}
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if err := exec.Command("ip", "addr", "add", wantCIDR.String(), "dev", "cbr0").Run(); err != nil {
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glog.Error(err)
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return err
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}
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if err := exec.Command("ip", "link", "set", "dev", "cbr0", "up").Run(); err != nil {
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glog.Error(err)
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return err
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}
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// restart docker
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if err := exec.Command("service", "docker", "restart").Run(); err != nil {
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glog.Error(err)
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// For now just log the error. The containerRuntime check will catch docker failures.
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// TODO (dawnchen) figure out what we should do for rkt here.
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}
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glog.V(2).Info("Recreated cbr0 and restarted docker")
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}
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return nil
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}
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func cbr0CidrCorrect(wantCIDR *net.IPNet) bool {
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output, err := exec.Command("ip", "addr", "show", "cbr0").Output()
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if err != nil {
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return false
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}
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match := cidrRegexp.FindSubmatch(output)
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if len(match) < 2 {
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return false
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}
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cbr0IP, cbr0CIDR, err := net.ParseCIDR(string(match[1]))
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if err != nil {
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glog.Errorf("Couldn't parse CIDR: %q", match[1])
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return false
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}
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cbr0CIDR.IP = cbr0IP
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glog.V(5).Infof("Want cbr0 CIDR: %s, have cbr0 CIDR: %s", wantCIDR, cbr0CIDR)
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return wantCIDR.IP.Equal(cbr0IP) && bytes.Equal(wantCIDR.Mask, cbr0CIDR.Mask)
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}
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