k3s/pkg/daemons/executor/etcd.go

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package executor
import (
"context"
"errors"
"os"
"path/filepath"
daemonconfig "github.com/k3s-io/k3s/pkg/daemons/config"
"github.com/k3s-io/k3s/pkg/version"
"github.com/sirupsen/logrus"
"go.etcd.io/etcd/server/v3/embed"
"go.etcd.io/etcd/server/v3/etcdserver/api/rafthttp"
)
type Embedded struct {
nodeConfig *daemonconfig.Node
}
func (e *Embedded) ETCD(ctx context.Context, args ETCDConfig, extraArgs []string) error {
configFile, err := args.ToConfigFile(extraArgs)
if err != nil {
return err
}
cfg, err := embed.ConfigFromFile(configFile)
if err != nil {
return err
}
etcd, err := embed.StartEtcd(cfg)
if err != nil {
return err
}
go func() {
select {
case err := <-etcd.Server.ErrNotify():
if errors.Is(err, rafthttp.ErrMemberRemoved) {
tombstoneFile := filepath.Join(args.DataDir, "tombstone")
if err := os.WriteFile(tombstoneFile, []byte{}, 0600); err != nil {
logrus.Fatalf("failed to write tombstone file to %s", tombstoneFile)
}
logrus.Infof("this node has been removed from the cluster please restart %s to rejoin the cluster", version.Program)
return
}
case <-ctx.Done():
logrus.Infof("stopping etcd")
etcd.Close()
case <-etcd.Server.StopNotify():
logrus.Fatalf("etcd stopped")
case err := <-etcd.Err():
logrus.Fatalf("etcd exited: %v", err)
}
}()
return nil
}