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update minor version of MySQL Group Replication
This guide will show you how to use KubeDB Ops Manager to update the minor version of MySQL Group Replication.
Before You Begin
At first, you need to have a Kubernetes cluster, and the
kubectlcommand-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.Install
KubeDBin your cluster following the steps here.You should be familiar with the following
KubeDBconcepts:
To keep everything isolated, we are going to use a separate namespace called demo throughout this tutorial.
$ kubectl create ns demo
namespace/demo created
Note: YAML files used in this tutorial are stored in docs/guides/mysql/update-version/minorversion/group-replication/yamls directory of kubedb/docs repository.
Apply Version updating on Group Replication
Here, we are going to deploy a MySQL group replication using a supported version by KubeDB operator. Then we are going to apply updating on it.
Prepare Group Replication
At first, we are going to deploy a group replication using supported that MySQL version whether it is possible to update from this version to another. In the next two sections, we are going to find out the supported version and version update constraints.
Find supported MySQL Version:
When you have installed KubeDB, it has created MySQLVersion CR for all supported MySQL versions. Let’s check the supported MySQL versions,
$ kubectl get mysqlversion
NAME VERSION DISTRIBUTION DB_IMAGE DEPRECATED AGE
5.7.35-v1 5.7.35 Official mysql:5.7.35 13d
5.7.44 5.7.44 Official mysql:5.7.44 13d
8.0.17 8.0.17 Official mysql:8.0.17 13d
8.0.35 8.0.35 Official mysql:8.0.35 13d
8.0.31-innodb 8.0.35 MySQL mysql/mysql-server:8.0.35 13d
8.0.35 8.0.35 Official mysql:8.0.35 13d
8.0.3-v4 8.0.3 Official mysql:8.0.3 13d
The version above that does not show DEPRECATED true is supported by KubeDB for MySQL. You can use any non-deprecated version. Now, we are going to select a non-deprecated version from MySQLVersion for MySQL group replication that will be possible to update from this version to another version. In the next section, we are going to verify version update constraints.
Check update Constraints:
Database version update constraints is a constraint that shows whether it is possible or not possible to update from one version to another. Let’s check the version update constraints of MySQL 8.0.35,
$ kubectl get mysqlversion 8.0.35 -o yaml
apiVersion: catalog.kubedb.com/v1alpha1
kind: MySQLVersion
metadata:
annotations:
meta.helm.sh/release-name: kubedb-catalog
meta.helm.sh/release-namespace: kubedb
creationTimestamp: "2022-06-16T13:52:58Z"
generation: 1
labels:
app.kubernetes.io/instance: kubedb-catalog
app.kubernetes.io/managed-by: Helm
app.kubernetes.io/name: kubedb-catalog
app.kubernetes.io/version: v2022.03.28
helm.sh/chart: kubedb-catalog-v2022.03.28
name: 8.0.35
resourceVersion: "1092466"
uid: fa68b792-a8b3-47a3-a32e-66a47f79c177
spec:
coordinator:
image: kubedb/mysql-coordinator:v0.5.0
db:
image: mysql:8.0.35
distribution: Official
exporter:
image: kubedb/mysqld-exporter:v0.13.1
initContainer:
image: kubedb/mysql-init:8.0.26-v1
podSecurityPolicies:
databasePolicyName: mysql-db
replicationModeDetector:
image: kubedb/replication-mode-detector:v0.13.0
stash:
addon:
backupTask:
name: mysql-backup-8.0.21
restoreTask:
name: mysql-restore-8.0.21
updateConstraints:
denylist:
groupReplication:
- < 8.0.35
standalone:
- < 8.0.35
version: 8.0.35
The above spec.updateConstraints.denylist of 8.0.35 is showing that updating below version of 8.0.35 is not possible for both group replication and standalone. That means, it is possible to update any version above 8.0.35. Here, we are going to create a MySQL Group Replication using MySQL 8.0.35. Then we are going to update this version to 8.0.35.
Deploy MySQL Group Replication:
In this section, we are going to deploy a MySQL group replication with 3 members. Then, in the next section we will update the version of the members using updating. Below is the YAML of the MySQL cr that we are going to create,
apiVersion: kubedb.com/v1alpha2
kind: MySQL
metadata:
name: my-group
namespace: demo
spec:
version: "8.0.35"
replicas: 3
topology:
mode: GroupReplication
group:
name: "dc002fc3-c412-4d18-b1d4-66c1fbfbbc9b"
storageType: Durable
storage:
storageClassName: "standard"
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 1Gi
terminationPolicy: WipeOut
Let’s create the MySQL cr we have shown above,
$ kubectl create -f https://github.com/kubedb/docs/raw/v2023.12.21/docs/guides/mysql/update-version/minorversion/group-replication/yamls/group_replication.yaml
mysql.kubedb.com/my-group created
Wait for the cluster to be ready:
KubeDB operator watches for MySQL objects using Kubernetes API. When a MySQL object is created, KubeDB operator will create a new StatefulSet, Services, and Secrets, etc. A secret called my-group-auth (format: {mysql-object-name}-auth) will be created storing the password for mysql superuser.
Now, watch MySQL is going to Running state and also watch StatefulSet and its pod is created and going to Running state,
$ watch -n 3 kubectl get my -n demo my-group
NAME VERSION STATUS AGE
my-group 8.0.35 Ready 5m
$ watch -n 3 kubectl get sts -n demo my-group
NAME READY AGE
my-group 3/3 7m12s
$ watch -n 3 kubectl get pod -n demo -l app.kubernetes.io/name=mysqls.kubedb.com,app.kubernetes.io/instance=my-group
NAME READY STATUS RESTARTS AGE
my-group-0 2/2 Running 0 11m
my-group-1 2/2 Running 0 9m53s
my-group-2 2/2 Running 0 6m48s
Let’s verify the MySQL, the StatefulSet and its Pod image version,
$ kubectl get my -n demo my-group -o=jsonpath='{.spec.version}{"\n"}'
8.0.35
$ kubectl get sts -n demo -l app.kubernetes.io/name=mysqls.kubedb.com,app.kubernetes.io/instance=my-group -o json | jq '.items[].spec.template.spec.containers[1].image'
"mysql:8.0.35"
$ kubectl get pod -n demo -l app.kubernetes.io/name=mysqls.kubedb.com,app.kubernetes.io/instance=my-group -o json | jq '.items[].spec.containers[1].image'
"mysql:8.0.35"
"mysql:8.0.35"
"mysql:8.0.35"
Let’s also verify that the StatefulSet’s pods have joined into the group replication,
$ kubectl get secrets -n demo my-group-auth -o jsonpath='{.data.\username}' | base64 -d
root
$ kubectl get secrets -n demo my-group-auth -o jsonpath='{.data.\password}' | base64 -d
XbUHi_Cp&SLSXTmo
$ kubectl exec -it -n demo my-group-0 -c mysql -- mysql -u root --password='XbUHi_Cp&SLSXTmo' --host=my-group-0.my-group-pods.demo -e "select * from performance_schema.replication_group_members"
mysql: [Warning] Using a password on the command line interface can be insecure.
+---------------------------+--------------------------------------+-----------------------------------+-------------+--------------+-------------+----------------+----------------------------+
| CHANNEL_NAME | MEMBER_ID | MEMBER_HOST | MEMBER_PORT | MEMBER_STATE | MEMBER_ROLE | MEMBER_VERSION | MEMBER_COMMUNICATION_STACK |
+---------------------------+--------------------------------------+-----------------------------------+-------------+--------------+-------------+----------------+----------------------------+
| group_replication_applier | 6e7f3cc4-f84d-11ec-adcd-d23a2a3ef58a | my-group-1.my-group-pods.demo.svc | 3306 | ONLINE | SECONDARY | 8.0.35 | XCom |
| group_replication_applier | 70c60c5b-f84d-11ec-821b-4af781e22a9f | my-group-2.my-group-pods.demo.svc | 3306 | ONLINE | SECONDARY | 8.0.35 | XCom |
| group_replication_applier | 71fdc498-f84d-11ec-a6f3-b2ee89425e4f | my-group-0.my-group-pods.demo.svc | 3306 | ONLINE | PRIMARY | 8.0.35 | XCom |
+---------------------------+--------------------------------------+-----------------------------------+-------------+--------------+-------------+----------------+----------------------------+
We are ready to apply updating on this MySQL group replication.
UpdateVersion
Here, we are going to update the MySQL group replication from 8.0.35 to 8.0.35.
Create MySQLOpsRequest:
To update your database cluster, you have to create a MySQLOpsRequest cr with your desired version that supported by KubeDB. Below is the YAML of the MySQLOpsRequest cr that we are going to create,
apiVersion: ops.kubedb.com/v1alpha1
kind: MySQLOpsRequest
metadata:
name: my-update-minor-group
namespace: demo
spec:
type: UpdateVersion
databaseRef:
name: my-group
updateVersion:
targetVersion: "8.0.35"
Here,
spec.databaseRef.namespecifies that we are performing operation onmy-groupMySQL database.spec.typespecifies that we are going to performUpdateVersionon our database.spec.updateVersion.targetVersionspecifies expected version8.0.35after updating.
Let’s create the MySQLOpsRequest cr we have shown above,
$ kubectl apply -f https://github.com/kubedb/docs/raw/v2023.12.21/docs/guides/mysql/update-version/minorversion/group-replication/yamls/update_minor_version_group.yaml
mysqlopsrequest.ops.kubedb.com/my-update-minor-group created
Verify MySQL version updated successfully:
If everything goes well, KubeDB Ops Manager will update the image of MySQL, StatefulSet, and its Pod.
At first, we will wait for MySQLOpsRequest to be successful. Run the following command to watch MySQlOpsRequest cr,
$ watch -n 3 kubectl get myops -n demo my-update-minor-group
NAME TYPE STATUS AGE
my-update-minor-group UpdateVersion Successful 5m26s
You can see from the above output that the MySQLOpsRequest has succeeded. If we describe the MySQLOpsRequest, we shall see that the MySQL group replication is updated with the new version and the StatefulSet is created with a new image.
$ kubectl describe myops -n demo my-update-minor-group
Name: my-update-minor-group
Namespace: demo
Labels: <none>
Annotations: <none>
API Version: ops.kubedb.com/v1alpha1
Kind: MySQLOpsRequest
Metadata:
Creation Timestamp: 2022-06-30T08:26:36Z
Manager: kubedb-ops-manager
Operation: Update
Time: 2022-06-30T08:26:36Z
Resource Version: 1712998
UID: 3a84eb20-ba5f-4ec6-969a-bfdb7b072b5a
Spec:
Database Ref:
Name: my-group
Type: UpdateVersion
UpdateVersion:
TargetVersion: 8.0.35
Status:
Conditions:
Last Transition Time: 2022-06-30T08:26:36Z
Message: Controller has started to Progress the MySQLOpsRequest: demo/my-update-minor-group
Observed Generation: 1
Reason: OpsRequestProgressingStarted
Status: True
Type: Progressing
Last Transition Time: 2022-06-30T08:26:36Z
Message: MySQL version updateFunc stated for MySQLOpsRequest: demo/my-update-minor-group
Observed Generation: 1
Reason: DatabaseVersionupdatingStarted
Status: True
Type: updating
Last Transition Time: 2022-06-30T08:31:26Z
Message: Image successfully updated in MySQL: demo/my-group for MySQLOpsRequest: my-update-minor-group
Observed Generation: 1
Reason: SuccessfullyUpdatedDatabaseVersion
Status: True
Type: UpdateVersion
Last Transition Time: 2022-06-30T08:31:27Z
Message: Controller has successfully updated the MySQL demo/my-update-minor-group
Observed Generation: 1
Reason: OpsRequestProcessedSuccessfully
Status: True
Type: Successful
Observed Generation: 3
Phase: Successful
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal Starting 33m KubeDB Enterprise Operator Start processing for MySQLOpsRequest: demo/my-update-minor-group
Normal Starting 33m KubeDB Enterprise Operator Pausing MySQL databse: demo/my-group
Normal Successful 33m KubeDB Enterprise Operator Successfully paused MySQL database: demo/my-group for MySQLOpsRequest: my-update-minor-group
Normal Starting 33m KubeDB Enterprise Operator updating MySQL images: demo/my-group for MySQLOpsRequest: my-update-minor-group
Normal Starting 33m KubeDB Enterprise Operator Restarting Pod: my-group-1/demo
Normal Starting 32m KubeDB Enterprise Operator Restarting Pod: my-group-2/demo
Normal Starting 30m KubeDB Enterprise Operator Restarting Pod: my-group-0/demo
Normal Successful 29m KubeDB Enterprise Operator Image successfully updated in MySQL: demo/my-group for MySQLOpsRequest: my-update-minor-group
Normal Starting 29m KubeDB Enterprise Operator Resuming MySQL database: demo/my-group
Normal Successful 29m KubeDB Enterprise Operator Successfully resumed MySQL database: demo/my-group
Normal Successful 29m KubeDB Enterprise Operator Controller has Successfully updated the version of MySQL : demo/my-group
Now, we are going to verify whether the MySQL and StatefulSet and it’s Pod have updated with new image. Let’s check,
$ kubectl get my -n demo my-group -o=jsonpath='{.spec.version}{"\n"}'
5.7.44
$ kubectl get sts -n demo -l app.kubernetes.io/name=mysqls.kubedb.com,app.kubernetes.io/instance=my-group -o json | jq '.items[].spec.template.spec.containers[1].image'
"mysql:8.0.35"
$ kubectl get pod -n demo -l app.kubernetes.io/name=mysqls.kubedb.com,app.kubernetes.io/instance=my-group -o json | jq '.items[].spec.containers[1].image'
"mysql:8.0.35"
"mysql:8.0.35"
"mysql:8.0.35"
Let’s also check the StatefulSet pods have joined the MySQL group replication,
$ kubectl get secrets -n demo my-group-auth -o jsonpath='{.data.\username}' | base64 -d
root
$ kubectl get secrets -n demo my-group-auth -o jsonpath='{.data.\password}' | base64 -d
XbUHi_Cp&SLSXTmo
$ kubectl exec -it -n demo my-group-0 -c mysql -- mysql -u root --password='XbUHi_Cp&SLSXTmo' --host=my-group-0.my-group-pods.demo -e "select * from performance_schema.replication_group_members"
mysql: [Warning] Using a password on the command line interface can be insecure.
+---------------------------+--------------------------------------+-----------------------------------+-------------+--------------+-------------+----------------+----------------------------+
| CHANNEL_NAME | MEMBER_ID | MEMBER_HOST | MEMBER_PORT | MEMBER_STATE | MEMBER_ROLE | MEMBER_VERSION | MEMBER_COMMUNICATION_STACK |
+---------------------------+--------------------------------------+-----------------------------------+-------------+--------------+-------------+----------------+----------------------------+
| group_replication_applier | 6e7f3cc4-f84d-11ec-adcd-d23a2a3ef58a | my-group-1.my-group-pods.demo.svc | 3306 | ONLINE | PRIMARY | 8.0.35 | XCom |
| group_replication_applier | 70c60c5b-f84d-11ec-821b-4af781e22a9f | my-group-2.my-group-pods.demo.svc | 3306 | ONLINE | SECONDARY | 8.0.35 | XCom |
| group_replication_applier | 71fdc498-f84d-11ec-a6f3-b2ee89425e4f | my-group-0.my-group-pods.demo.svc | 3306 | ONLINE | SECONDARY | 8.0.35 | XCom |
+---------------------------+--------------------------------------+-----------------------------------+-------------+--------------+-------------+----------------+----------------------------+
You can see above that our MySQL group replication now has updated members. It verifies that we have successfully updated our cluster.
Cleaning Up
To clean up the Kubernetes resources created by this tutorial, run:
kubectl delete my -n demo my-group
kubectl delete myops -n demo my-update-minor-group