/
api_internal_recover.go
623 lines (517 loc) · 22.4 KB
/
api_internal_recover.go
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package main
import (
"context"
"encoding/json"
"errors"
"fmt"
"net/http"
"github.com/canonical/lxd/lxd/auth"
"github.com/canonical/lxd/lxd/backup"
backupConfig "github.com/canonical/lxd/lxd/backup/config"
"github.com/canonical/lxd/lxd/db"
dbCluster "github.com/canonical/lxd/lxd/db/cluster"
deviceConfig "github.com/canonical/lxd/lxd/device/config"
"github.com/canonical/lxd/lxd/instance"
"github.com/canonical/lxd/lxd/instance/instancetype"
"github.com/canonical/lxd/lxd/project"
"github.com/canonical/lxd/lxd/response"
"github.com/canonical/lxd/lxd/state"
storagePools "github.com/canonical/lxd/lxd/storage"
storageDrivers "github.com/canonical/lxd/lxd/storage/drivers"
"github.com/canonical/lxd/shared"
"github.com/canonical/lxd/shared/api"
"github.com/canonical/lxd/shared/entity"
"github.com/canonical/lxd/shared/logger"
"github.com/canonical/lxd/shared/osarch"
"github.com/canonical/lxd/shared/revert"
)
// Define API endpoints for recover actions.
var internalRecoverValidateCmd = APIEndpoint{
Path: "recover/validate",
Post: APIEndpointAction{Handler: internalRecoverValidate, AccessHandler: allowPermission(entity.TypeServer, auth.EntitlementCanEdit)},
}
var internalRecoverImportCmd = APIEndpoint{
Path: "recover/import",
Post: APIEndpointAction{Handler: internalRecoverImport, AccessHandler: allowPermission(entity.TypeServer, auth.EntitlementCanEdit)},
}
// init recover adds API endpoints to handler slice.
func init() {
apiInternal = append(apiInternal, internalRecoverValidateCmd, internalRecoverImportCmd)
}
// internalRecoverValidatePost is used to initiate a recovery validation scan.
type internalRecoverValidatePost struct {
Pools []api.StoragePoolsPost `json:"pools" yaml:"pools"`
}
// internalRecoverValidateVolume provides info about a missing volume that the recovery validation scan found.
type internalRecoverValidateVolume struct {
Name string `json:"name" yaml:"name"` // Name of volume.
Type string `json:"type" yaml:"type"` // Same as Type from StorageVolumesPost (container, custom or virtual-machine).
SnapshotCount int `json:"snapshotCount" yaml:"snapshotCount"` // Count of snapshots found for volume.
Project string `json:"project" yaml:"project"` // Project the volume belongs to.
Pool string `json:"pool" yaml:"pool"` // Pool the volume belongs to.
}
// internalRecoverValidateResult returns the result of the validation scan.
type internalRecoverValidateResult struct {
UnknownVolumes []internalRecoverValidateVolume // Volumes that could be imported.
DependencyErrors []string // Errors that are preventing import from proceeding.
}
// internalRecoverImportPost is used to initiate a recovert import.
type internalRecoverImportPost struct {
Pools []api.StoragePoolsPost `json:"pools" yaml:"pools"`
}
// internalRecoverScan provides the discovery and import functionality for both recovery validate and import steps.
func internalRecoverScan(s *state.State, userPools []api.StoragePoolsPost, validateOnly bool) response.Response {
var err error
var projects map[string]*api.Project
var projectProfiles map[string][]*api.Profile
var projectNetworks map[string]map[int64]api.Network
// Retrieve all project, profile and network info in a single transaction so we can use it for all
// imported instances and volumes, and avoid repeatedly querying the same information.
err = s.DB.Cluster.Transaction(context.TODO(), func(ctx context.Context, tx *db.ClusterTx) error {
// Load list of projects for validation.
ps, err := dbCluster.GetProjects(ctx, tx.Tx())
if err != nil {
return err
}
// Convert to map for lookups by name later.
projects = make(map[string]*api.Project, len(ps))
for i := range ps {
project, err := ps[i].ToAPI(ctx, tx.Tx())
if err != nil {
return err
}
projects[ps[i].Name] = project
}
// Load list of project/profile names for validation.
profiles, err := dbCluster.GetProfiles(ctx, tx.Tx())
if err != nil {
return err
}
// Convert to map for lookups by project name later.
projectProfiles = make(map[string][]*api.Profile)
for _, profile := range profiles {
if projectProfiles[profile.Project] == nil {
projectProfiles[profile.Project] = []*api.Profile{}
}
apiProfile, err := profile.ToAPI(ctx, tx.Tx())
if err != nil {
return err
}
projectProfiles[profile.Project] = append(projectProfiles[profile.Project], apiProfile)
}
// Load list of project/network names for validation.
projectNetworks, err = tx.GetCreatedNetworks(ctx)
if err != nil {
return err
}
return nil
})
if err != nil {
return response.SmartError(fmt.Errorf("Failed getting validate dependency check info: %w", err))
}
res := internalRecoverValidateResult{}
revert := revert.New()
defer revert.Fail()
// addDependencyError adds an error to the list of dependency errors if not already present in list.
addDependencyError := func(err error) {
errStr := err.Error()
if !shared.ValueInSlice(errStr, res.DependencyErrors) {
res.DependencyErrors = append(res.DependencyErrors, errStr)
}
}
// Used to store the unknown volumes for each pool & project.
poolsProjectVols := make(map[string]map[string][]*backupConfig.Config)
// Used to store a handle to each pool containing user supplied config.
pools := make(map[string]storagePools.Pool)
// Iterate the pools finding unknown volumes and perform validation.
for _, p := range userPools {
pool, err := storagePools.LoadByName(s, p.Name)
if err != nil {
if response.IsNotFoundError(err) {
// If the pool DB record doesn't exist, and we are clustered, then don't proceed
// any further as we do not support pool DB record recovery when clustered.
if s.ServerClustered {
return response.BadRequest(fmt.Errorf("Storage pool recovery not supported when clustered"))
}
// If pool doesn't exist in DB, initialise a temporary pool with the supplied info.
poolInfo := api.StoragePool{
Name: p.Name,
Driver: p.Driver,
Status: api.StoragePoolStatusCreated,
}
poolInfo.SetWritable(p.StoragePoolPut)
pool, err = storagePools.NewTemporary(s, &poolInfo)
if err != nil {
return response.SmartError(fmt.Errorf("Failed to initialise unknown pool %q: %w", p.Name, err))
}
// Populate configuration with default values.
err := pool.Driver().FillConfig()
if err != nil {
return response.SmartError(fmt.Errorf("Failed to evaluate the default configuration values for unknown pool %q: %w", p.Name, err))
}
err = pool.Driver().Validate(poolInfo.Config)
if err != nil {
return response.SmartError(fmt.Errorf("Failed config validation for unknown pool %q: %w", p.Name, err))
}
} else {
return response.SmartError(fmt.Errorf("Failed loading existing pool %q: %w", p.Name, err))
}
}
// Record this pool to be used during import stage, assuming validation passes.
pools[p.Name] = pool
// Try to mount the pool.
ourMount, err := pool.Mount()
if err != nil {
return response.SmartError(fmt.Errorf("Failed mounting pool %q: %w", pool.Name(), err))
}
// Unmount pool when done if not existing in DB after function has finished.
// This way if we are dealing with an existing pool or have successfully created the DB record then
// we won't unmount it. As we should leave successfully imported pools mounted.
if ourMount {
defer func() {
cleanupPool := pools[pool.Name()]
if cleanupPool != nil && cleanupPool.ID() == storagePools.PoolIDTemporary {
_, _ = cleanupPool.Unmount()
}
}()
revert.Add(func() {
cleanupPool := pools[pool.Name()]
_, _ = cleanupPool.Unmount() // Defer won't do it if record exists, so unmount on failure.
})
}
// Get list of unknown volumes on pool.
poolProjectVols, err := pool.ListUnknownVolumes(nil)
if err != nil {
if errors.Is(err, storageDrivers.ErrNotSupported) {
continue // Ignore unsupported storage drivers.
}
return response.SmartError(fmt.Errorf("Failed checking volumes on pool %q: %w", pool.Name(), err))
}
// Store for consumption after validation scan to avoid needing to reprocess.
poolsProjectVols[p.Name] = poolProjectVols
// Check dependencies are met for each volume.
for projectName, poolVols := range poolProjectVols {
// Check project exists in database.
projectInfo := projects[projectName]
// Look up effective project names for profiles and networks.
var profileProjectname string
var networkProjectName string
if projectInfo != nil {
profileProjectname = project.ProfileProjectFromRecord(projectInfo)
networkProjectName = project.NetworkProjectFromRecord(projectInfo)
} else {
addDependencyError(fmt.Errorf("Project %q", projectName))
continue // Skip further validation if project is missing.
}
for _, poolVol := range poolVols {
if poolVol.Container == nil {
continue // Skip dependency checks for non-instance volumes.
}
// Check that the instance's profile dependencies are met.
for _, poolInstProfileName := range poolVol.Container.Profiles {
foundProfile := false
for _, profile := range projectProfiles[profileProjectname] {
if profile.Name == poolInstProfileName {
foundProfile = true
}
}
if !foundProfile {
addDependencyError(fmt.Errorf("Profile %q in project %q", poolInstProfileName, projectName))
}
}
// Check that the instance's NIC network dependencies are met.
for _, devConfig := range poolVol.Container.ExpandedDevices {
if devConfig["type"] != "nic" {
continue
}
if devConfig["network"] == "" {
continue
}
foundNetwork := false
for _, n := range projectNetworks[networkProjectName] {
if n.Name == devConfig["network"] {
foundNetwork = true
break
}
}
if !foundNetwork {
addDependencyError(fmt.Errorf("Network %q in project %q", devConfig["network"], projectName))
}
}
}
}
}
// If in validation mode or if there are dependency errors, return discovered unknown volumes, along with
// any dependency errors.
if validateOnly || len(res.DependencyErrors) > 0 {
for poolName, poolProjectVols := range poolsProjectVols {
for projectName, poolVols := range poolProjectVols {
for _, poolVol := range poolVols {
var displayType, displayName string
var displaySnapshotCount int
// Build display fields for scan results.
if poolVol.Container != nil {
displayType = poolVol.Container.Type
displayName = poolVol.Container.Name
displaySnapshotCount = len(poolVol.Snapshots)
} else if poolVol.Bucket != nil {
displayType = "bucket"
displayName = poolVol.Bucket.Name
displaySnapshotCount = 0
} else {
displayType = "volume"
displayName = poolVol.Volume.Name
displaySnapshotCount = len(poolVol.VolumeSnapshots)
}
res.UnknownVolumes = append(res.UnknownVolumes, internalRecoverValidateVolume{
Pool: poolName,
Project: projectName,
Type: displayType,
Name: displayName,
SnapshotCount: displaySnapshotCount,
})
}
}
}
return response.SyncResponse(true, &res)
}
// If in import mode and no dependency errors, then re-create missing DB records.
for _, pool := range pools {
// Create missing storage pool DB record if neeed.
if pool.ID() == storagePools.PoolIDTemporary {
var instPoolVol *backupConfig.Config // Instance volume used for new pool record.
var poolID int64 // Pool ID of created pool record.
var poolVols []*backupConfig.Config
for _, value := range poolsProjectVols[pool.Name()] {
poolVols = append(poolVols, value...)
}
// Search unknown volumes looking for an instance volume that can be used to
// restore the pool DB config from. This is preferable over using the user
// supplied config as it will include any additional settings not supplied.
for _, poolVol := range poolVols {
if poolVol.Pool != nil && poolVol.Pool.Config != nil {
instPoolVol = poolVol
break // Stop search once we've found an instance with pool config.
}
}
if instPoolVol != nil {
// Create storage pool DB record from config in the instance.
logger.Info("Creating storage pool DB record from instance config", logger.Ctx{"name": instPoolVol.Pool.Name, "description": instPoolVol.Pool.Description, "driver": instPoolVol.Pool.Driver, "config": instPoolVol.Pool.Config})
poolID, err = dbStoragePoolCreateAndUpdateCache(s, instPoolVol.Pool.Name, instPoolVol.Pool.Description, instPoolVol.Pool.Driver, instPoolVol.Pool.Config)
if err != nil {
return response.SmartError(fmt.Errorf("Failed creating storage pool %q database entry: %w", pool.Name(), err))
}
} else {
// Create storage pool DB record from config supplied by user if not
// instance volume pool config found.
poolDriverName := pool.Driver().Info().Name
poolDriverConfig := pool.Driver().Config()
logger.Info("Creating storage pool DB record from user config", logger.Ctx{"name": pool.Name(), "driver": poolDriverName, "config": poolDriverConfig})
poolID, err = dbStoragePoolCreateAndUpdateCache(s, pool.Name(), "", poolDriverName, poolDriverConfig)
if err != nil {
return response.SmartError(fmt.Errorf("Failed creating storage pool %q database entry: %w", pool.Name(), err))
}
}
revert.Add(func() {
_ = dbStoragePoolDeleteAndUpdateCache(s, pool.Name())
})
// Set storage pool node to storagePoolCreated.
// Must come before storage pool is loaded from the database.
err = s.DB.Cluster.Transaction(context.TODO(), func(ctx context.Context, tx *db.ClusterTx) error {
return tx.StoragePoolNodeCreated(poolID)
})
if err != nil {
return response.SmartError(fmt.Errorf("Failed marking storage pool %q local status as created: %w", pool.Name(), err))
}
logger.Debug("Marked storage pool local status as created", logger.Ctx{"pool": pool.Name()})
newPool, err := storagePools.LoadByName(s, pool.Name())
if err != nil {
return response.SmartError(fmt.Errorf("Failed loading created storage pool %q: %w", pool.Name(), err))
}
// Record this newly created pool so that defer doesn't unmount on return.
pools[pool.Name()] = newPool
pool = newPool // Replace temporary pool handle with proper one from DB.
}
// Create any missing instance, storage volume, and storage bucket records.
for projectName, poolVols := range poolsProjectVols[pool.Name()] {
projectInfo := projects[projectName]
if projectInfo == nil {
// Shouldn't happen as we validated this above, but be sure for safety.
return response.SmartError(fmt.Errorf("Project %q not found", projectName))
}
profileProjectName := project.ProfileProjectFromRecord(projectInfo)
customStorageProjectName := project.StorageVolumeProjectFromRecord(projectInfo, dbCluster.StoragePoolVolumeTypeCustom)
// Recover unknown custom volumes (do this first before recovering instances so that any
// instances that reference unknown custom volume disk devices can be created).
for _, poolVol := range poolVols {
if poolVol.Container != nil || poolVol.Bucket != nil {
continue // Skip instance volumes and buckets.
} else if poolVol.Container == nil && poolVol.Volume == nil {
return response.SmartError(fmt.Errorf("Volume is neither instance nor custom volume"))
}
// Import custom volume and any snapshots.
cleanup, err := pool.ImportCustomVolume(customStorageProjectName, poolVol, nil)
if err != nil {
return response.SmartError(fmt.Errorf("Failed importing custom volume %q in project %q: %w", poolVol.Volume.Name, projectName, err))
}
revert.Add(cleanup)
}
// Recover unknown instance volumes.
for _, poolVol := range poolVols {
if poolVol.Container == nil && (poolVol.Volume != nil || poolVol.Bucket != nil) {
continue // Skip custom volumes, invalid volumes and buckets.
}
// Recover instance volumes and any snapshots.
profiles := make([]api.Profile, 0, len(poolVol.Container.Profiles))
for _, profileName := range poolVol.Container.Profiles {
for i := range projectProfiles[profileProjectName] {
if projectProfiles[profileProjectName][i].Name == profileName {
profiles = append(profiles, *projectProfiles[profileProjectName][i])
}
}
}
inst, cleanup, err := internalRecoverImportInstance(s, pool, projectName, poolVol, profiles)
if err != nil {
return response.SmartError(fmt.Errorf("Failed creating instance %q record in project %q: %w", poolVol.Container.Name, projectName, err))
}
revert.Add(cleanup)
// Recover instance volume snapshots.
for _, poolInstSnap := range poolVol.Snapshots {
profiles := make([]api.Profile, 0, len(poolInstSnap.Profiles))
for _, profileName := range poolInstSnap.Profiles {
for i := range projectProfiles[profileProjectName] {
if projectProfiles[profileProjectName][i].Name == profileName {
profiles = append(profiles, *projectProfiles[profileProjectName][i])
}
}
}
cleanup, err := internalRecoverImportInstanceSnapshot(s, pool, projectName, poolVol, poolInstSnap, profiles)
if err != nil {
return response.SmartError(fmt.Errorf("Failed creating instance %q snapshot %q record in project %q: %w", poolVol.Container.Name, poolInstSnap.Name, projectName, err))
}
revert.Add(cleanup)
}
// Recreate instance mount path and symlinks (must come after snapshot recovery).
cleanup, err = pool.ImportInstance(inst, poolVol, nil)
if err != nil {
return response.SmartError(fmt.Errorf("Failed importing instance %q in project %q: %w", poolVol.Container.Name, projectName, err))
}
revert.Add(cleanup)
// Reinitialise the instance's root disk quota even if no size specified (allows the storage driver the
// opportunity to reinitialise the quota based on the new storage volume's DB ID).
_, rootConfig, err := instancetype.GetRootDiskDevice(inst.ExpandedDevices().CloneNative())
if err == nil {
err = pool.SetInstanceQuota(inst, rootConfig["size"], rootConfig["size.state"], nil)
if err != nil {
return response.SmartError(fmt.Errorf("Failed reinitializing root disk quota %q for instance %q in project %q: %w", rootConfig["size"], poolVol.Container.Name, projectName, err))
}
}
}
// Recover unknown buckets.
for _, poolVol := range poolVols {
// Skip non bucket volumes.
if poolVol.Bucket == nil {
continue
}
// Import bucket.
cleanup, err := pool.ImportBucket(projectName, poolVol, nil)
if err != nil {
return response.SmartError(fmt.Errorf("Failed importing bucket %q in project %q: %w", poolVol.Bucket.Name, projectName, err))
}
revert.Add(cleanup)
}
}
}
revert.Success()
return response.EmptySyncResponse
}
// internalRecoverImportInstance recreates the database records for an instance and returns the new instance.
// Returns a revert fail function that can be used to undo this function if a subsequent step fails.
func internalRecoverImportInstance(s *state.State, pool storagePools.Pool, projectName string, poolVol *backupConfig.Config, profiles []api.Profile) (instance.Instance, revert.Hook, error) {
if poolVol.Container == nil {
return nil, nil, fmt.Errorf("Pool volume is not an instance volume")
}
// Add root device if needed.
if poolVol.Container.Devices == nil {
poolVol.Container.Devices = make(map[string]map[string]string, 0)
}
if poolVol.Container.ExpandedDevices == nil {
poolVol.Container.ExpandedDevices = make(map[string]map[string]string, 0)
}
internalImportRootDevicePopulate(pool.Name(), poolVol.Container.Devices, poolVol.Container.ExpandedDevices, profiles)
dbInst, err := backup.ConfigToInstanceDBArgs(s, poolVol, projectName, true)
if err != nil {
return nil, nil, err
}
if dbInst.Type < 0 {
return nil, nil, fmt.Errorf("Invalid instance type")
}
inst, instOp, cleanup, err := instance.CreateInternal(s, *dbInst, false)
if err != nil {
return nil, nil, fmt.Errorf("Failed creating instance record: %w", err)
}
defer instOp.Done(err)
return inst, cleanup, err
}
// internalRecoverImportInstance recreates the database records for an instance snapshot.
func internalRecoverImportInstanceSnapshot(s *state.State, pool storagePools.Pool, projectName string, poolVol *backupConfig.Config, snap *api.InstanceSnapshot, profiles []api.Profile) (revert.Hook, error) {
if poolVol.Container == nil || snap == nil {
return nil, fmt.Errorf("Pool volume is not an instance volume")
}
// Add root device if needed.
if snap.Devices == nil {
snap.Devices = make(map[string]map[string]string, 0)
}
if snap.ExpandedDevices == nil {
snap.ExpandedDevices = make(map[string]map[string]string, 0)
}
internalImportRootDevicePopulate(pool.Name(), snap.Devices, snap.ExpandedDevices, profiles)
arch, err := osarch.ArchitectureId(snap.Architecture)
if err != nil {
return nil, err
}
instanceType, err := instancetype.New(poolVol.Container.Type)
if err != nil {
return nil, err
}
_, snapInstOp, cleanup, err := instance.CreateInternal(s, db.InstanceArgs{
Project: projectName,
Architecture: arch,
BaseImage: snap.Config["volatile.base_image"],
Config: snap.Config,
CreationDate: snap.CreatedAt,
Type: instanceType,
Snapshot: true,
Devices: deviceConfig.NewDevices(snap.Devices),
Ephemeral: snap.Ephemeral,
LastUsedDate: snap.LastUsedAt,
Name: poolVol.Container.Name + shared.SnapshotDelimiter + snap.Name,
Profiles: profiles,
Stateful: snap.Stateful,
}, false)
if err != nil {
return nil, fmt.Errorf("Failed creating instance snapshot record %q: %w", snap.Name, err)
}
defer snapInstOp.Done(err)
return cleanup, err
}
// internalRecoverValidate validates the requested pools to be recovered.
func internalRecoverValidate(d *Daemon, r *http.Request) response.Response {
// Parse the request.
req := &internalRecoverValidatePost{}
err := json.NewDecoder(r.Body).Decode(&req)
if err != nil {
return response.BadRequest(err)
}
return internalRecoverScan(d.State(), req.Pools, true)
}
// internalRecoverImport performs the pool volume recovery.
func internalRecoverImport(d *Daemon, r *http.Request) response.Response {
// Parse the request.
req := &internalRecoverImportPost{}
err := json.NewDecoder(r.Body).Decode(&req)
if err != nil {
return response.BadRequest(err)
}
return internalRecoverScan(d.State(), req.Pools, false)
}