mirror of https://github.com/kubernetes/kops.git
96 lines
2.6 KiB
Go
96 lines
2.6 KiB
Go
/*
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Copyright 2021 The Kubernetes Authors.
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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 nodetasks
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import (
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"fmt"
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"k8s.io/klog/v2"
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"k8s.io/kops/protokube/pkg/gossip/dns/hosts"
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"k8s.io/kops/upup/pkg/fi"
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"k8s.io/kops/upup/pkg/fi/nodeup/local"
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)
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// UpdateEtcHostsTask is responsible for updating /etc/hosts to set some DNS records, for gossip.
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type UpdateEtcHostsTask struct {
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// Name is a reference for our task
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Name string
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// Records holds the records that should be updated
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Records []HostRecord
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}
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// HostRecord holds an individual host's addresses.
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type HostRecord struct {
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fi.NodeupNotADependency
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// Hostname is the "DNS" name that we want to configure.
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Hostname string
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// Addresses holds the IP addresses to write.
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// Other IP addresses for the same Name will be removed.
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Addresses []string
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}
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var _ fi.NodeupTask = &UpdateEtcHostsTask{}
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func (e *UpdateEtcHostsTask) String() string {
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return fmt.Sprintf("UpdateEtcHostsTask: %s", e.Name)
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}
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var _ fi.HasName = &UpdateEtcHostsTask{}
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func (f *UpdateEtcHostsTask) GetName() *string {
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return &f.Name
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}
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func (e *UpdateEtcHostsTask) Find(c *fi.NodeupContext) (*UpdateEtcHostsTask, error) {
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// UpdateHostsFileWithRecords skips the update /etc/hosts if there are no changes,
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// so we don't check existing values here.
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return nil, nil
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}
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func (e *UpdateEtcHostsTask) Run(c *fi.NodeupContext) error {
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return fi.NodeupDefaultDeltaRunMethod(e, c)
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}
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func (_ *UpdateEtcHostsTask) CheckChanges(a, e, changes *UpdateEtcHostsTask) error {
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return nil
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}
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func (_ *UpdateEtcHostsTask) RenderLocal(t *local.LocalTarget, a, e, changes *UpdateEtcHostsTask) error {
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etcHostsPath := "/etc/hosts"
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mutator := func(existing []string) (*hosts.HostMap, error) {
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hostMap := &hosts.HostMap{}
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badLines := hostMap.Parse(existing)
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if len(badLines) != 0 {
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klog.Warningf("ignoring unexpected lines in /etc/hosts: %v", badLines)
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}
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for _, record := range e.Records {
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hostMap.ReplaceRecords(record.Hostname, record.Addresses)
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}
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return hostMap, nil
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}
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if err := hosts.UpdateHostsFileWithRecords(etcHostsPath, mutator); err != nil {
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return fmt.Errorf("failed to update /etc/hosts: %w", err)
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}
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return nil
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}
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