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cmd.go
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cmd.go
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/*
Copyright The CloudNativePG Contributors
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 join implements the "instance join" subcommand of the operator
package join
import (
"context"
"os"
"github.com/spf13/cobra"
ctrl "sigs.k8s.io/controller-runtime/pkg/client"
apiv1 "github.com/cloudnative-pg/cloudnative-pg/api/v1"
"github.com/cloudnative-pg/cloudnative-pg/internal/management/controller"
"github.com/cloudnative-pg/cloudnative-pg/internal/management/istio"
"github.com/cloudnative-pg/cloudnative-pg/internal/management/linkerd"
"github.com/cloudnative-pg/cloudnative-pg/pkg/management"
"github.com/cloudnative-pg/cloudnative-pg/pkg/management/log"
"github.com/cloudnative-pg/cloudnative-pg/pkg/management/postgres"
"github.com/cloudnative-pg/cloudnative-pg/pkg/management/postgres/webserver/metricserver"
)
// NewCmd creates the new "join" command
func NewCmd() *cobra.Command {
var pgData string
var pgWal string
var parentNode string
var podName string
var clusterName string
var namespace string
cmd := &cobra.Command{
Use: "join [options]",
PreRunE: func(cmd *cobra.Command, _ []string) error {
return management.WaitKubernetesAPIServer(cmd.Context(), ctrl.ObjectKey{
Name: clusterName,
Namespace: namespace,
})
},
RunE: func(cmd *cobra.Command, _ []string) error {
ctx := cmd.Context()
instance := postgres.NewInstance()
// The following are needed to correctly
// download the secret containing the TLS
// certificates
instance.Namespace = namespace
instance.PodName = podName
instance.ClusterName = clusterName
info := postgres.InitInfo{
PgData: pgData,
PgWal: pgWal,
ParentNode: parentNode,
PodName: podName,
}
return joinSubCommand(ctx, instance, info)
},
PostRunE: func(cmd *cobra.Command, _ []string) error {
if err := istio.TryInvokeQuitEndpoint(cmd.Context()); err != nil {
return err
}
return linkerd.TryInvokeShutdownEndpoint(cmd.Context())
},
}
cmd.Flags().StringVar(&pgData, "pg-data", os.Getenv("PGDATA"), "The PGDATA to be created")
cmd.Flags().StringVar(&pgWal, "pg-wal", "", "the PGWAL to be created")
cmd.Flags().StringVar(&parentNode, "parent-node", "", "The origin node")
cmd.Flags().StringVar(&podName, "pod-name", os.Getenv("POD_NAME"), "The name of this pod, to "+
"be checked against the cluster state")
cmd.Flags().StringVar(&namespace, "namespace", os.Getenv("NAMESPACE"), "The namespace of "+
"the cluster and of the Pod in k8s")
cmd.Flags().StringVar(&clusterName, "cluster-name", os.Getenv("CLUSTER_NAME"), "The name of "+
"the current cluster in k8s, used to download TLS certificates")
return cmd
}
func joinSubCommand(ctx context.Context, instance *postgres.Instance, info postgres.InitInfo) error {
err := info.VerifyPGData()
if err != nil {
return err
}
client, err := management.NewControllerRuntimeClient()
if err != nil {
log.Error(err, "Error creating Kubernetes client")
return err
}
metricServer, err := metricserver.New(instance)
if err != nil {
return err
}
// Let's download the crypto material from the cluster
// secrets.
reconciler := controller.NewInstanceReconciler(instance, client, metricServer)
if err != nil {
log.Error(err, "Error creating reconciler to download certificates")
return err
}
var cluster apiv1.Cluster
err = reconciler.GetClient().Get(ctx,
ctrl.ObjectKey{Namespace: instance.Namespace, Name: instance.ClusterName},
&cluster)
if err != nil {
log.Error(err, "Error while getting cluster")
return err
}
reconciler.RefreshSecrets(ctx, &cluster)
err = info.Join(&cluster)
if err != nil {
log.Error(err, "Error joining node")
return err
}
return nil
}