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edgedns.go
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edgedns.go
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// Copyright 2021 FabEdge Team
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package agent
import (
"flag"
"os"
"path"
"text/template"
"github.com/coredns/caddy"
_ "github.com/coredns/coredns/plugin/bind"
_ "github.com/coredns/coredns/plugin/cache"
_ "github.com/coredns/coredns/plugin/debug"
_ "github.com/coredns/coredns/plugin/dns64"
_ "github.com/coredns/coredns/plugin/errors"
_ "github.com/coredns/coredns/plugin/forward"
_ "github.com/coredns/coredns/plugin/health"
_ "github.com/coredns/coredns/plugin/hosts"
_ "github.com/coredns/coredns/plugin/loadbalance"
_ "github.com/coredns/coredns/plugin/log"
_ "github.com/coredns/coredns/plugin/loop"
_ "github.com/coredns/coredns/plugin/metrics"
_ "github.com/coredns/coredns/plugin/pprof"
_ "github.com/coredns/coredns/plugin/ready"
_ "github.com/coredns/coredns/plugin/reload"
_ "github.com/coredns/coredns/plugin/rewrite"
_ "github.com/coredns/coredns/plugin/template"
_ "github.com/coredns/coredns/plugin/trace"
_ "github.com/coredns/coredns/plugin/whoami"
// use custom kubernetes plugin to cope with kubeedge issue
// https://github.com/kubeedge/kubeedge/issues/4582
_ "github.com/fabedge/fabedge/coredns/plugin/kubernetes"
)
const (
corefileTemplate = `
.:53 {
errors
{{ if .Debug -}}
log
debug
{{ end -}}
kubernetes {{ .ClusterDomain }} in-addr.arpa ip6.arpa {
endpoint http://127.0.0.1:10550
pods insecure
fallthrough in-addr.arpa ip6.arpa
}
forward . /etc/resolv.conf {
prefer_udp
}
{{ if .Probe -}}
health {
lameduck 5s
}
ready
{{ end -}}
cache 30
loop
reload
bind {{ .BindIP }}
}
`
)
func (m *Manager) ensureDummyDevice() error {
m.log.V(3).Info("ensure that the dummy interface exists")
if _, err := m.netLink.EnsureDummyDevice(m.DummyInterfaceName); err != nil {
m.log.Error(err, "failed to check or create dummy interface", "dummyInterface", m.DummyInterfaceName)
return err
}
if _, err := m.netLink.EnsureAddressBind(m.DNS.BindIP, m.DummyInterfaceName); err != nil {
m.log.Error(err, "failed to bind address", "address", m.DNS.BindIP)
return err
}
return nil
}
func (m *Manager) runCoreDNS() {
tpl, err := template.New("corefile").Parse(corefileTemplate)
if err != nil {
m.log.Error(err, "failed to create corefile template")
return
}
corefilePath := path.Join(m.Workdir, "Corefile")
file, err := os.OpenFile(corefilePath, os.O_RDWR|os.O_CREATE, 0644)
if err != nil {
m.log.Error(err, "failed to open corefile")
return
}
defer file.Close()
if err = tpl.Execute(file, m.DNS); err != nil {
m.log.Error(err, "failed to write config to Corefile")
return
}
if err = flag.Set("conf", corefilePath); err != nil {
m.log.Error(err, "failed to write config to Corefile")
return
}
// Get Corefile input
corefile, err := caddy.LoadCaddyfile("dns")
if err != nil {
m.log.Error(err, "failed to load caddy file")
return
}
instance, err := caddy.Start(corefile)
if err != nil {
m.log.Error(err, "failed to start caddy")
return
}
instance.Wait()
}