Install Percona Server for MySQL on Google Kubernetes Engine (GKE)¶

This guide shows you how to deploy Percona Operator for MySQL on Google Kubernetes Engine (GKE). The document assumes some experience with the platform. For more information on the GKE, see the Kubernetes Engine Quickstart .

Prerequisites¶

All commands from this guide can be run either in the Google Cloud shell or in your local shell.

To use Google Cloud shell, you need nothing but a modern web browser.

If you would like to use your local shell, install the following:

gcloud . This tool is part of the Google Cloud SDK. To install it, select your operating system on the official Google Cloud SDK documentation page and then follow the instructions.
kubectl . It is the Kubernetes command-line tool you will use to manage and deploy applications. To install the tool, run the following command:
```
$ gcloud auth login
$ gcloud components install kubectl
```

Create and configure the GKE cluster¶

You can configure the settings using the gcloud tool. You can run it either in the Cloud Shell or in your local shell (if you have installed Google Cloud SDK locally on the previous step). The following command will create a cluster named cluster1:

$ gcloud container clusters create cluster1 --project <project ID> --zone us-central1-a --cluster-version 1.29 --machine-type n1-standard-4 --num-nodes=3

Note

You must edit the above command and other command-line statements to replace the <project ID> placeholder with your project ID (see available projects with gcloud projects list command). You may also be required to edit the zone location, which is set to us-central1-a in the above example. Other parameters specify that we are creating a cluster with 3 nodes and with machine type of 4 vCPUs.

You may wait a few minutes for the cluster to be generated.

When the process is over, you can see it listed in the Google Cloud console

Select Kubernetes Engine → Clusters in the left menu panel:

Now you should configure the command-line access to your newly created cluster to make kubectl be able to use it.

In the Google Cloud Console, select your cluster and then click the Connect shown on the above image. You will see the connect statement which configures the command-line access. After you have edited the statement, you may run the command in your local shell:

$ gcloud container clusters get-credentials cluster1 --zone us-central1-a --project <project name>

Finally, use your Cloud Identity and Access Management (Cloud IAM) to control access to the cluster. The following command will give you the ability to create Roles and RoleBindings:

$ kubectl create clusterrolebinding cluster-admin-binding --clusterrole cluster-admin --user $(gcloud config get-value core/account)

Expected output

clusterrolebinding.rbac.authorization.k8s.io/cluster-admin-binding created

Install the Operator and deploy your MySQL cluster¶

Deploy the Operator. By default deployment will be done in the default namespace. If that’s not the desired one, you can create a new namespace and/or set the context for the namespace as follows (replace the <namespace name> placeholder with some descriptive name):

$ kubectl create namespace <namespace name>
$ kubectl config set-context $(kubectl config current-context) --namespace=<namespace name>

At success, you will see the message that namespace/<namespace name> was created, and the context (gke_<project name>_<zone location>_<cluster name>) was modified.

Deploy the Operator using the following command:

$ kubectl apply -f https://raw.githubusercontent.com/percona/percona-server-mysql-operator/v0.8.0/deploy/bundle.yaml

Expected output

customresourcedefinition.apiextensions.k8s.io/perconaservermysqlbackups.ps.percona.com created
customresourcedefinition.apiextensions.k8s.io/perconaservermysqlrestores.ps.percona.com created
customresourcedefinition.apiextensions.k8s.io/perconaservermysqls.ps.percona.com created
serviceaccount/percona-server-mysql-operator created
role.rbac.authorization.k8s.io/percona-server-mysql-operator-leaderelection created
role.rbac.authorization.k8s.io/percona-server-mysql-operator created
rolebinding.rbac.authorization.k8s.io/percona-server-mysql-operator-leaderelection created
rolebinding.rbac.authorization.k8s.io/percona-server-mysql-operator created
configmap/percona-server-mysql-operator-config created
deployment.apps/percona-server-mysql-operator created

The operator has been started, and you can deploy your MySQL cluster:
```
$ kubectl apply -f https://raw.githubusercontent.com/percona/percona-server-mysql-operator/v0.8.0/deploy/cr.yaml
```
Expected output
```
perconaservermysql.ps.percona.com/cluster1 created
```
Note

This deploys default MySQL cluster configuration. Please see deploy/cr.yaml and Custom Resource Options for the configuration options. You can clone the repository with all manifests and source code by executing the following command:
```
$ git clone -b v0.8.0 https://github.com/percona/percona-server-mysql-operator
```
After editing the needed options, apply your modified deploy/cr.yaml file as follows:
```
$ kubectl apply -f deploy/cr.yaml
```
The creation process may take some time. When the process is over your cluster will obtain the ready status. You can check it with the following command:
```
$ kubectl get ps
```
Expected output
```
NAME       REPLICATION   ENDPOINT                   STATE   MYSQL   ORCHESTRATOR   HAPROXY   ROUTER   AGE
cluster1   async         cluster1-haproxy.default   ready   3       3              3                  5m50s
```

You can also track the creation process in Google Cloud console via the Object Browser

When the creation process is finished, it will look as follows:

Verifying the cluster operation¶

It may take ten minutes to get the cluster started. When kubectl get ps command finally shows you the cluster status as ready, you can try to connect to the cluster.

To connect to Percona Server for MySQL you will need the password for the root user. Passwords are stored in the Secrets object, which was generated during the previous steps.

Here’s how to get it:

List the Secrets objects.
```
$ kubectl get secrets
```
It will show you the list of Secrets objects (by default the Secrets object you are interested in has cluster1-secrets name).
Use the following command to get the password of the root user. Substitute cluster1 with your value, if needed:
```
$ kubectl get secret cluster1-secrets -o yaml
```
The command returns the YAML file with generated Secrets, including the root password, which should look as follows:
```
...
data:
  ...
  root: <base64-encoded-password>
```
The actual password is base64-encoded. Use the following command to bring it back to a human-readable form:
```
$ echo '<base64-encoded-password>' | base64 --decode
```
Run a container with mysql tool and connect its console output to your terminal. The following command will do this, naming the new Pod percona-client:
```
$ kubectl run -i --rm --tty percona-client --image=percona:8.0 --restart=Never -- bash -il
```
It may require some time to execute the command and deploy the correspondent Pod.

Now run mysql tool in the percona-client command shell using the password obtained from the Secret instead of the <root password> placeholder. The command will look different depending on whether the cluster uses load balancing with HAProxy (the default behavior) or uses MySQL Router (can be used with Group Replication clusters):

If using HAProxy (default)If using MySQL Router

$ mysql -h cluster1-haproxy -uroot -p<root password>

$ mysql -h cluster1-router -uroot -p<root password>

Expected output

mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 4065
Server version: 8.0.29-21 Percona Server (GPL), Release 21, Revision c59f87d2854

Copyright (c) 2009-2022 Percona LLC and/or its affiliates
Copyright (c) 2000, 2022, Oracle and/or its affiliates.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql>

The following example uses the MySQL prompt to check the max_connections variable:

mysql> SHOW VARIABLES LIKE "max_connections";

Expected output

+-----------------+-------+
| Variable_name   | Value |
+-----------------+-------+
| max_connections | 158   |
+-----------------+-------+
1 row in set (0.02 sec)

mysql>

Troubleshooting¶

If kubectl get ps command doesn’t show ready status too long, you can check the creation process with the kubectl get pods command:

$ kubectl get pods

Expected output

NAME                                            READY   STATUS    RESTARTS      AGE
cluster1-haproxy-0                              2/2     Running   0             44m
cluster1-haproxy-1                              2/2     Running   0             44m
cluster1-haproxy-2                              2/2     Running   0             44m
cluster1-mysql-0                                3/3     Running   0             46m
cluster1-mysql-1                                3/3     Running   2 (44m ago)   45m
cluster1-mysql-2                                3/3     Running   2 (42m ago)   43m
cluster1-orc-0                                  2/2     Running   0             46m
cluster1-orc-1                                  2/2     Running   0             45m
cluster1-orc-2                                  2/2     Running   0             44m
percona-server-mysql-operator-7c984f7c9-mgwh4   1/1     Running   0             47m

If the command output had shown some errors, you can examine the problematic Pod with the kubectl describe <pod name> command as follows:

$ kubectl describe pod cluster1-mysql-2

Review the detailed information for Warning statements and then correct the configuration. An example of a warning is as follows:

Warning FailedScheduling 68s (x4 over 2m22s) default-scheduler 0/1 nodes are available: 1 node(s) didn’t match pod affinity/anti-affinity, 1 node(s) didn’t satisfy existing pods anti-affinity rules.

Alternatively, you can examine your Pods via the object browser

The errors will look as follows:

Clicking the problematic Pod will bring you to the details page with the same warning:

Removing the GKE cluster¶

There are several ways that you can delete the cluster.

You can clean up the cluster with the gcloud container clusters delete <cluster name> --zone <zone location> command. The return statement requests your confirmation of the deletion. Type y to confirm.

$ gcloud container clusters delete cluster1 --zone us-central1-a --project <project ID>

The return statement requests your confirmation of the deletion. Type y to confirm.

Also, you can delete your cluster via the Google Cloud console

Just click the Delete popup menu item in the clusters list:

The cluster deletion may take time.

Warning

After deleting the cluster, all data stored in it will be lost!

Get expert help¶

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Last update: 2024-10-29