// handleBackup handles a request that intends to do a backup.
func handleBackup(c *cli.Context) {
srcSnap := path.Join(c.String("data-dir"), "member", "snap")
destSnap := path.Join(c.String("backup-dir"), "member", "snap")
srcWAL := path.Join(c.String("data-dir"), "member", "wal")
destWAL := path.Join(c.String("backup-dir"), "member", "wal")
if err := os.MkdirAll(destSnap, 0700); err != nil {
log.Fatalf("failed creating backup snapshot dir %v: %v", destSnap, err)
}
ss := snap.New(srcSnap)
snapshot, err := ss.Load()
if err != nil && err != snap.ErrNoSnapshot {
log.Fatal(err)
}
var walsnap walpb.Snapshot
if snapshot != nil {
walsnap.Index, walsnap.Term = snapshot.Metadata.Index, snapshot.Metadata.Term
newss := snap.New(destSnap)
if err := newss.SaveSnap(*snapshot); err != nil {
log.Fatal(err)
}
}
w, err := wal.OpenForRead(srcWAL, walsnap)
if err != nil {
log.Fatal(err)
}
defer w.Close()
wmetadata, state, ents, err := w.ReadAll()
switch err {
case nil:
case wal.ErrSnapshotNotFound:
fmt.Printf("Failed to find the match snapshot record %+v in wal %v.", walsnap, srcWAL)
fmt.Printf("etcdctl will add it back. Start auto fixing...")
default:
log.Fatal(err)
}
var metadata etcdserverpb.Metadata
pbutil.MustUnmarshal(&metadata, wmetadata)
idgen := idutil.NewGenerator(0, time.Now())
metadata.NodeID = idgen.Next()
metadata.ClusterID = idgen.Next()
neww, err := wal.Create(destWAL, pbutil.MustMarshal(&metadata))
if err != nil {
log.Fatal(err)
}
defer neww.Close()
if err := neww.Save(state, ents); err != nil {
log.Fatal(err)
}
if err := neww.SaveSnapshot(walsnap); err != nil {
log.Fatal(err)
}
}
func startNode(cfg *ServerConfig, cl *cluster, ids []types.ID) (id types.ID, n raft.Node, s *raftStorage, w *wal.WAL) {
var err error
member := cl.MemberByName(cfg.Name)
metadata := pbutil.MustMarshal(
&pb.Metadata{
NodeID: uint64(member.ID),
ClusterID: uint64(cl.ID()),
},
)
if err := os.MkdirAll(cfg.SnapDir(), privateDirMode); err != nil {
plog.Fatalf("create snapshot directory error: %v", err)
}
if w, err = wal.Create(cfg.WALDir(), metadata); err != nil {
plog.Fatalf("create wal error: %v", err)
}
peers := make([]raft.Peer, len(ids))
for i, id := range ids {
ctx, err := json.Marshal((*cl).Member(id))
if err != nil {
plog.Panicf("marshal member should never fail: %v", err)
}
peers[i] = raft.Peer{ID: uint64(id), Context: ctx}
}
id = member.ID
plog.Infof("starting member %s in cluster %s", id, cl.ID())
s = newRaftStorage()
c := &raft.Config{
ID: uint64(id),
ElectionTick: cfg.ElectionTicks,
HeartbeatTick: 1,
Storage: s,
MaxSizePerMsg: maxSizePerMsg,
MaxInflightMsgs: maxInflightMsgs,
}
n = raft.StartNode(c, peers)
raftStatus = n.Status
advanceTicksForElection(n, c.ElectionTick)
return
}