func (dfs *DistributedFilesystem) Restore(filename string) error {
// fail if any services are running
dfs.log("Checking running services")
svcs, err := dfs.facade.GetServices(datastore.Get(), dao.ServiceRequest{})
if err != nil {
glog.Errorf("Could not acquire the list of all services: %s", err)
return err
}
for _, svc := range svcs {
conn, err := zzk.GetLocalConnection(zzk.GeneratePoolPath(svc.PoolID))
if err != nil {
glog.Errorf("Could not acquire connection to coordinator (%s): %s", svc.PoolID, err)
return err
}
if states, err := zkservice.GetServiceStates(conn, svc.ID); err != nil {
glog.Errorf("Could not look up running instances for %s (%s): %s", svc.Name, svc.ID, err)
return err
} else if running := len(states); running > 0 {
err := fmt.Errorf("service %s (%s) has %d running instances", svc.Name, svc.ID, running)
glog.Errorf("Cannot restore to %s: %s", filename, err)
return err
}
}
var reloadLogstashContainer bool
defer func() {
if reloadLogstashContainer {
go facade.LogstashContainerReloader(datastore.Get(), dfs.facade) // don't block main thread
}
}()
dirpath := filepath.Join(utils.BackupDir(dfs.varpath), "restore")
if err := os.RemoveAll(dirpath); err != nil {
glog.Errorf("Could not remove %s: %s", dirpath, err)
return err
}
if err := mkdir(dirpath); err != nil {
glog.Errorf("Could neither find nor create %s: %s", dirpath, err)
return err
}
defer func() {
if err := os.RemoveAll(dirpath); err != nil {
glog.Warningf("Could not remove %s: %s", dirpath, err)
}
}()
dfs.log("Extracting backup file %s", filename)
if err := importTGZ(dirpath, filename); err != nil {
glog.Errorf("Could not expand %s to %s: %s", filename, dirpath, err)
return err
}
var metadata metadata
if err := importJSON(filepath.Join(dirpath, meta), &metadata); err != nil {
glog.Errorf("Could not import %s: %s", meta, err)
return err
} else if metadata.FSType != dfs.fsType {
err = fmt.Errorf("this backup can only be run on %s", metadata.FSType)
glog.Errorf("Could not extract backup %s: %s", filename, err)
return err
}
var pools []pool.ResourcePool
if err := importJSON(filepath.Join(dirpath, poolJSON), &pools); err != nil {
glog.Errorf("Could not read resource pools from %s: %s", filename, err)
return err
}
// restore the resource pools (and virtual ips)
dfs.log("Loading resource pools")
for _, pool := range pools {
pool.DatabaseVersion = 0
glog.V(1).Infof("Restoring resource pool %s", pool.ID)
var err error
if err = dfs.facade.AddResourcePool(datastore.Get(), &pool); err == facade.ErrPoolExists {
err = dfs.facade.UpdateResourcePool(datastore.Get(), &pool)
}
if err != nil {
glog.Errorf("Could not restore resource pool %s: %s", pool.ID, err)
return err
}
}
dfs.log("Resource pool load successful")
var hosts []host.Host
if err := importJSON(filepath.Join(dirpath, hostJSON), &hosts); err != nil {
glog.Errorf("Could not read hosts from %s: %s", filename, err)
return err
}
// restore the hosts (add it if it doesn't exist; assume hosts don't need to be updated from backup)
dfs.log("Loading static ips")
for _, host := range hosts {
host.DatabaseVersion = 0
glog.V(1).Infof("Restoring host %s (%s)", host.ID, host.IPAddr)
if exists, err := dfs.facade.HasIP(datastore.Get(), host.PoolID, host.IPAddr); err != nil {
glog.Errorf("Could not check IP %s for pool %s: %s", host.IPAddr, host.PoolID, err)
return err
} else if exists {
glog.Warningf("Could not restore host %s (%s): ip already exists", host.ID, host.IPAddr)
} else if err := dfs.facade.AddHost(datastore.Get(), &host); err != nil {
glog.Errorf("Could not add host %s: %s", host.ID, err)
return err
}
}
dfs.log("Static ip load successful")
var templates map[string]servicetemplate.ServiceTemplate
if err := importJSON(filepath.Join(dirpath, templateJSON), &templates); err != nil {
glog.Errorf("Could not read templates from %s: %s", filename, err)
return err
}
// restore the service templates
dfs.log("Loading service templates")
for templateID, template := range templates {
template.DatabaseVersion = 0
glog.V(1).Infof("Restoring service template %s", templateID)
template.ID = templateID
if err := dfs.facade.UpdateServiceTemplate(datastore.Get(), template); err != nil {
glog.Errorf("Could not restore template %s: %s", templateID, err)
return err
}
reloadLogstashContainer = true
}
dfs.log("Service template load successful")
// Get the tenant of all the services to be restored
snapshotFiles, err := ls(filepath.Join(dirpath, snapshotDir))
tenantIDs := make(map[string]struct{})
for _, f := range snapshotFiles {
tenantIDs[strings.TrimSuffix(f, ".tgz")] = struct{}{}
}
// restore docker images
dfs.log("Loading docker images")
var images []imagemeta
if err := importJSON(filepath.Join(dirpath, imageJSON), &images); err != nil {
glog.Errorf("Could not read images from %s: %s", filename, err)
return err
}
if err := dfs.importImages(filepath.Join(dirpath, imageDir), images, tenantIDs); err != nil {
glog.Errorf("Could not import images from %s: %s", filename, err)
return err
}
dfs.log("Docker image load successful")
// restore snapshots
glog.V(1).Infof("Restoring services and snapshots")
for _, f := range snapshotFiles {
dfs.log("Loading %s", f)
if err := dfs.loadSnapshots(strings.TrimSuffix(f, ".tgz"), filepath.Join(dirpath, snapshotDir, f)); err != nil {
glog.Errorf("Could not import snapshot from %s: %s", f, err)
return err
}
dfs.log("Successfully loaded %s", f)
}
glog.Infof("Restore succeeded with fsType:%s from file:%s", dfs.fsType, filename)
return nil
}
// ListBackups lists all the backups in a given directory
func (dfs *DistributedFilesystem) ListBackups(dirpath string) ([]dao.BackupFile, error) {
backups := make([]dao.BackupFile, 0)
if dirpath = strings.TrimSpace(dirpath); dirpath == "" {
dirpath = utils.BackupDir(dfs.varpath)
} else {
dirpath = filepath.Clean(dirpath)
}
// Validate the path
if fp, err := os.Stat(dirpath); os.IsNotExist(err) {
// Directory not found means no backups yet
return backups, nil
} else if err != nil {
glog.Errorf("Error looking up path %s: %s", dirpath, err)
return nil, err
} else if !fp.IsDir() {
return nil, fmt.Errorf("path is not a directory")
}
// Get the list of files
files, err := ioutil.ReadDir(dirpath)
if err != nil {
return nil, err
}
// Get the ip address
hostIP, err := utils.GetIPAddress()
if err != nil {
return nil, err
}
// Filter backup files
filemap := make(map[string]dao.BackupFile)
for _, file := range files {
if file.IsDir() {
// If it is a directory, it could be the directory file for a
// backup tgz, so mark the file as InProgress
backup := filemap[file.Name()]
backup.InProgress = true
filemap[file.Name()] = backup
} else if ext := filepath.Ext(file.Name()); ext == ".tgz" {
// Create the backup file object
abspath := filepath.Join(dirpath, file.Name())
name := strings.TrimSuffix(file.Name(), ext)
backup := filemap[name]
backup.FullPath = fmt.Sprintf("%s:%s", hostIP, abspath)
backup.Name = abspath
backup.Size = file.Size()
backup.Mode = file.Mode()
backup.ModTime = file.ModTime()
filemap[name] = backup
}
}
// Clean up non-backups
for _, backup := range filemap {
if backup.FullPath != "" {
// Directories without a related backup file get filtered
backups = append(backups, backup)
}
}
return backups, nil
}
// Backup backs up serviced, saving the last n snapshots
func (dfs *DistributedFilesystem) Backup(dirpath string, last int) (string, error) {
dfs.log("Starting backup")
// get the full path of the backup
name := time.Now().Format("backup-2006-01-02-150405")
if dirpath = strings.TrimSpace(dirpath); dirpath == "" {
dirpath = utils.BackupDir(dfs.varpath)
}
filename := filepath.Join(dirpath, fmt.Sprintf("%s.tgz", name))
dirpath = filepath.Join(dirpath, name)
if err := mkdir(dirpath); err != nil {
glog.Errorf("Could neither find nor create %s: %v", dirpath, err)
return "", err
}
defer func() {
if err := os.RemoveAll(dirpath); err != nil {
glog.Errorf("Could not remove %s: %v", dirpath, err)
}
}()
if err := exportJSON(filepath.Join(dirpath, meta), &metadata{dfs.fsType}); err != nil {
glog.Errorf("Could not export %s: %s", meta, err)
return "", err
}
for _, dir := range []string{imageDir, snapshotDir} {
p := filepath.Join(dirpath, dir)
if err := mkdir(p); err != nil {
glog.Errorf("Could not create %s: %s", p, err)
return "", err
}
}
// retrieve services
svcs, err := dfs.facade.GetServices(datastore.Get(), dao.ServiceRequest{})
if err != nil {
glog.Errorf("Could not get services: %s", err)
return "", err
}
// export pools (and virtual ips)
dfs.log("Exporting resource pools")
pools, err := dfs.facade.GetResourcePools(datastore.Get())
if err != nil {
glog.Errorf("Could not get resource pools: %s", err)
return "", err
}
if err := exportJSON(filepath.Join(dirpath, poolJSON), pools); err != nil {
glog.Errorf("Could not export resource pools: %s", err)
return "", err
}
dfs.log("Resource pool export successful")
// export hosts
dfs.log("Exporting hosts")
hosts, err := dfs.facade.GetHosts(datastore.Get())
if err != nil {
glog.Errorf("Could not get hosts: %s", err)
return "", err
}
if err := exportJSON(filepath.Join(dirpath, hostJSON), hosts); err != nil {
glog.Errorf("Could not export hosts: %s", err)
return "", err
}
dfs.log("Host export successful")
// export all template definitions
dfs.log("Exporting template definitions")
templates, err := dfs.facade.GetServiceTemplates(datastore.Get())
if err != nil {
glog.Errorf("Could not get service templates: %s", err)
return "", err
}
if err := exportJSON(filepath.Join(dirpath, templateJSON), templates); err != nil {
glog.Errorf("Could not export service templates: %s", err)
return "", err
}
dfs.log("Template definition export successful")
// export snapshots
var snapshots []string
for _, svc := range svcs {
if svc.ParentServiceID == "" {
dfs.log("Exporting snapshots for %s (%s)", svc.Name, svc.ID)
_, labels, err := dfs.saveSnapshots(svc.ID, filepath.Join(dirpath, snapshotDir), last)
if err != nil {
glog.Errorf("Could not export snapshot for %s (%s): %s", svc.Name, svc.ID, err)
return "", err
}
snapshots = append(snapshots, labels...)
dfs.log("Exporting of %s (%s) snapshots successful", svc.Name, svc.ID)
}
}
// export all of the docker images
dfs.log("Exporting docker images")
imageTags, err := dfs.exportImages(filepath.Join(dirpath, imageDir), templates, svcs, snapshots)
if err != nil {
glog.Errorf("Could not export docker images: %s", err)
return "", err
}
if err := exportJSON(filepath.Join(dirpath, imageJSON), &imageTags); err != nil {
glog.Errorf("Could not export images: %s", err)
return "", err
}
dfs.log("Docker image export successful")
dfs.log("Writing backup file")
if err := exportTGZ(dirpath, filename); err != nil {
glog.Errorf("Could not write backup file %s: %s", filename, err)
return "", err
}
dfs.log("Backup file created: %s", filename)
glog.Infof("Backup succeeded with fsType:%s saved to file:%s", dfs.fsType, filename)
return filename, nil
}