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KubeDB MySQL - Continuous Archiving and Point-in-time Recovery

Here, will show you how to use KubeDB to provision a MySQL to Archive continuously and Restore point-in-time.

Before You Begin

At first, you need to have a Kubernetes cluster, and the kubectl command-line tool must be configured to communicate with your cluster. If you do not already have a cluster, you can create one by using kind.

Now,install KubeDB operator in your cluster following the steps here.

To install KubeStash operator in your cluster following the steps here.

To install SideKick in your cluster following the steps here.

To install External-snapshotter in your cluster following the steps here.

To keep things isolated, this tutorial uses a separate namespace called demo throughout this tutorial.

$ kubectl create ns demo
namespace/demo created

Note: The yaml files used in this tutorial are stored in docs/guides/mysql/remote-replica/yamls folder in GitHub repository kubedb/docs.

continuous archiving

Continuous archiving involves making regular copies (or “archives”) of the MySQL transaction log files.To ensure continuous archiving to a remote location we need prepare BackupStorage,RetentionPolicy,MySQLArchiver for the KubeDB Managed MySQL Databases.

BackupStorage

BackupStorage is a CR provided by KubeStash that can manage storage from various providers like GCS, S3, and more.

apiVersion: storage.kubestash.com/v1alpha1
kind: BackupStorage
metadata:
  name: linode-storage
  namespace: demo
spec:
  storage:
    provider: s3
    s3:
      bucket: mehedi-mysql-wal-g
      endpoint: https://ap-south-1.linodeobjects.com
      region: ap-south-1
      prefix: backup
      secret: storage
  usagePolicy:
    allowedNamespaces:
      from: All
  default: true
  deletionPolicy: WipeOut

   $ kubectl apply -f backupstorage.yaml
   backupstorage.storage.kubestash.com/linode-storage created

secrets for backup-storage

apiVersion: v1
kind: Secret
type: Opaque
metadata:
  name: storage
  namespace: demo
stringData:
  AWS_ACCESS_KEY_ID: "*************26CX"
  AWS_SECRET_ACCESS_KEY: "************jj3lp"
  AWS_ENDPOINT: https://ap-south-1.linodeobjects.com

  $ kubectl apply -f storage-secret.yaml 
  secret/storage created

Retention policy

RetentionPolicy is a CR provided by KubeStash that allows you to set how long you’d like to retain the backup data.

apiVersion: storage.kubestash.com/v1alpha1
kind: RetentionPolicy
metadata:
  name: mysql-retention-policy
  namespace: demo
spec:
  maxRetentionPeriod: "30d"
  successfulSnapshots:
    last: 100
  failedSnapshots:
    last: 2

$ kubectl apply -f  https://github.com/kubedb/docs/raw/v2023.12.28/docs/guides/mysql/pitr/yamls/retention-policy.yaml 
retentionpolicy.storage.kubestash.com/mysql-retention-policy created

MySQLArchiver

MySQLArchiver is a CR provided by KubeDB for managing the archiving of MySQL binlog files and performing volume-level backups

apiVersion: archiver.kubedb.com/v1alpha1
kind: MySQLArchiver
metadata:
  name: mysqlarchiver-sample
  namespace: demo
spec:
  pause: false
  databases:
    namespaces:
      from: Selector
      selector:
        matchLabels:
         kubernetes.io/metadata.name: demo
    selector:
      matchLabels:
        archiver: "true"
  retentionPolicy:
    name: mysql-retention-policy
    namespace: demo
  encryptionSecret: 
    name: "encrypt-secret"
    namespace: "demo"  
  fullBackup:
    driver: "VolumeSnapshotter"
    task:
      params:
        volumeSnapshotClassName: "longhorn-snapshot-vsc"
    scheduler:
      successfulJobsHistoryLimit: 1
      failedJobsHistoryLimit: 1
      schedule: "/30 * * * *"
    sessionHistoryLimit: 2
  manifestBackup:
    scheduler:
      successfulJobsHistoryLimit: 1
      failedJobsHistoryLimit: 1 
      schedule: "/30 * * * *"
    sessionHistoryLimit: 2
  backupStorage:
    ref:
      name: "linode-storage"
      namespace: "demo"

EncryptionSecret

apiVersion: v1
kind: Secret
type: Opaque
metadata:
  name: encrypt-secret
  namespace: demo
stringData:
  RESTIC_PASSWORD: "changeit"

 $ kubectl create -f https://github.com/kubedb/docs/raw/v2023.12.28/docs/guides/mysql/pirt/yamls/mysqlarchiver.yaml
 mysqlarchiver.archiver.kubedb.com/mysqlarchiver-sample created
 $ kubectl create -f https://github.com/kubedb/docs/raw/v2023.12.28/docs/guides/mysql/pirt/yamls/encryptionSecret.yaml

Ensure volumeSnapshotClass

$ kubectl get volumesnapshotclasses
NAME                    DRIVER               DELETIONPOLICY   AGE
longhorn-snapshot-vsc   driver.longhorn.io   Delete           7d22h

If not any, try using longhorn or any other volumeSnapshotClass.

kind: VolumeSnapshotClass
apiVersion: snapshot.storage.k8s.io/v1
metadata:
  name: longhorn-snapshot-vsc
driver: driver.longhorn.io
deletionPolicy: Delete
parameters:
  type: snap

$ helm install longhorn longhorn/longhorn --namespace longhorn-system --create-namespace

$ kubectl apply -f volumesnapshotclass.yaml
  volumesnapshotclass.snapshot.storage.k8s.io/longhorn-snapshot-vsc unchanged

Deploy MySQL

So far we are ready with setup for continuously archive MySQL, We deploy a mysqlql referring the MySQL archiver object

apiVersion: kubedb.com/v1alpha2
kind: MySQL
metadata:
  name: mysql
  namespace: demo
  labels:
    archiver: "true"
spec:
  authSecret:
    name: my-auth
  version: "8.2.0"
  replicas: 3
  topology:
    mode: GroupReplication
  storageType: Durable
  storage:
    storageClassName: "longhorn"
    accessModes:
      - ReadWriteOnce
    resources:
      requests:
        storage: 10Gi
  archiver:
    ref:
      name: mysqlarchiver-sample
      namespace: demo
  terminationPolicy: WipeOut

$ kubectl get pod -n demo
NAME                                                     READY   STATUS      RESTARTS        AGE
mysql-0                                                  2/2     Running     0               28h
mysql-1                                                  2/2     Running     0               28h
mysql-2                                                  2/2     Running     0               28h
mysql-backup-config-full-backup-1703680982-vqf7c         0/1     Completed   0               28h
mysql-backup-config-manifest-1703680982-62x97            0/1     Completed   0               28h
mysql-sidekick                                           1/1     Running     0               28h

mysql-sidekick is responsible for uploading binlog files

mysql-backup-config-full-backup-1703680982-vqf7c are the pod of volumes levels backups for MySQL.

mysql-backup-config-manifest-1703680982-62x97 are the pod of the manifest backup related to MySQL object

validate BackupConfiguration and VolumeSnapshots


$ kubectl get backupconfigurations -n demo

NAME                    PHASE   PAUSED   AGE
mysql-backup-config   Ready            2m43s

$ kubectl get backupsession -n demo
NAME                                           INVOKER-TYPE          INVOKER-NAME            PHASE       DURATION   AGE
mysql-backup-config-full-backup-1702388088   BackupConfiguration   mysql-backup-config   Succeeded              74s
mysql-backup-config-manifest-1702388088      BackupConfiguration   mysql-backup-config   Succeeded              74s

kubectl get volumesnapshots -n demo
NAME                           READYTOUSE   SOURCEPVC                  SOURCESNAPSHOTCONTENT   RESTORESIZE   SNAPSHOTCLASS           SNAPSHOTCONTENT                                    CREATIONTIME   AGE
mysql-1702388096               true         data-mysql-1                                       1Gi           longhorn-snapshot-vsc   snapcontent-735e97ad-1dfa-4b70-b416-33f7270d792c   2m5s           2m5s

data insert and switch wal

After each and every wal switch the wal files will be uploaded to backup storage

$ kubectl exec -it -n demo  mysql-0 -- bash

bash-4.4$ mysql -uroot -p$MYSQL_ROOT_PASSWORD

mysql> create database hello;

mysql> use hello;

mysql> CREATE TABLE `demo_table`(
    ->     `id` BIGINT(20) NOT NULL,
    ->     `name` VARCHAR(255) DEFAULT NULL,
    ->     PRIMARY KEY (`id`)
    -> );

mysql> INSERT INTO `demo_table` (`id`, `name`)
    -> VALUES
    ->     (1, 'John'),
    ->     (2, 'Jane'),
    ->     (3, 'Bob'),
    ->     (4, 'Alice'),
    ->     (5, 'Charlie'),
    ->     (6, 'Diana'),
    ->     (7, 'Eve'),
    ->     (8, 'Frank'),
    ->     (9, 'Grace'),
    ->     (10, 'Henry');

mysql> select now();
+---------------------+
| now()               |
+---------------------+
| 2023-12-28 17:10:54 |mysql> select now();
+---------------------+
| now()               |
+---------------------+
| 2023-12-28 17:10:54 |
+---------------------+
+---------------------+

mysql> select count(*) from demo_table;
+----------+
| count(*) |
+----------+
|       10 |
+----------+

At this point We have 10 rows in our newly created table demo_table on database hello

Point-in-time Recovery

Point-In-Time Recovery allows you to restore a MySQL database to a specific point in time using the archived transaction logs. This is particularly useful in scenarios where you need to recover to a state just before a specific error or data corruption occurred. Let’s say accidentally our dba drops the the table tab_1 and we want to restore.

$ kubectl exec -it -n demo  mysql-0 -- bash

mysql> drop table demo_table;

mysql> flush logs;

We can’t restore from a full backup since at this point no full backup was perform. so we can choose a specific time in which time we want to restore.We can get the specfice time from the wal that archived in the backup storage . Go to the binlog file and find where to store. You can parse binlog-files using mysqlbinlog.

For the demo I will use the previous time we get form select now()

mysql> select now();
+---------------------+
| now()               |
+---------------------+
| 2023-12-28 17:10:54 |
+---------------------+

Restore MySQL

apiVersion: kubedb.com/v1alpha2
kind: MySQL
metadata:
  name: restore-mysql
  namespace: demo
spec:
  init:
    archiver:
      encryptionSecret:
        name: encrypt-secret
        namespace: demo
      fullDBRepository:
        name: mysql-repository
        namespace: demo
      recoveryTimestamp: "2023-12-28T17:10:54Z"
  version: "8.2.0"
  replicas: 3
  topology:
    mode: GroupReplication
  storageType: Durable
  storage:
    storageClassName: "longhorn"
    accessModes:
      - ReadWriteOnce
    resources:
      requests:
        storage: 10Gi
  terminationPolicy: WipeOut

$ kubectl apply -f restore.yaml
mysql.kubedb.com/restore-mysql created

check for Restored MySQL

$ kubectl get pod -n demo
restore-mysql-0                                          1/1     Running     0             44s
restore-mysql-1                                          1/1     Running     0             42s
restore-mysql-2                                          1/1     Running     0             41s
restore-mysql-restorer-z4brz                             0/2     Completed   0             113s
restore-mysql-restoresession-lk6jq                       0/1     Completed   0             2m6s

$ kubectl get mysql -n demo
NAME            VERSION   STATUS   AGE
mysql           8.2.0    Ready    28h
restore-mysql   8.2.0    Ready    5m37s

Validating data on Restored MySQL

$ kubectl exec -it -n demo restore-mysql-0 -- bash
bash-4.4$ mysql -uroot -p$MYSQL_ROOT_PASSWORD

mysql> use hello

mysql> select count(*) from demo_table;
+----------+
| count(*) |
+----------+
|       10 |
+----------+
1 row in set (0.00 sec)

so we are able to successfully recover from a disaster

Cleaning up

To cleanup the Kubernetes resources created by this tutorial, run:

$ kubectl delete -n demo mysql/mysql
$ kubectl delete -n demo mysql/restore-mysql
$ kubectl delete -n demo backupstorage
$ kubectl delete -n demo mysqlarchiver
$ kubectl delete ns demo

Next Steps

Learn about backup and restore MySQL database using Stash.
Learn about initializing MySQL with Script.
Learn about custom MySQLVersions.
Want to setup MySQL cluster? Check how to configure Highly Available MySQL Cluster
Monitor your MySQL database with KubeDB using built-in Prometheus.
Monitor your MySQL database with KubeDB using Prometheus operator.
Detail concepts of MySQL object.
Use private Docker registry to deploy MySQL with KubeDB.
Want to hack on KubeDB? Check our contribution guidelines.

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