Install Percona XtraDB Cluster on Kubernetes

Install Percona XtraDB Cluster on Kubernetes

1. First of all, clone the percona-xtradb-cluster-operator repository:

   git clone -b release-0.2.0 https://github.com/Percona-Lab/percona-xtradb-cluster-operator
   cd percona-xtradb-cluster-operator
   

   Note: It is crucial to specify the right branch with -b option while cloning the code on this step. Please be careful.

2. Now Custom Resource Definition for PXC should be created from the deploy/crd.yaml file. Custom Resource Definition extends the standard set of resources which Kubernetes “knows” about with the new items (in our case ones which are the core of the operator).

   This step should be done only once; it does not need to be repeated with the next Operator deployments, etc.

   $ kubectl apply -f deploy/crd.yaml
   

3. The next thing to do is to add the pxc namespace to Kubernetes, not forgetting to set the correspondent context for further steps:

   $ kubectl create namespace pxc
   $ kubectl config set-context $(kubectl config current-context) --namespace=pxc
   

4. Now RBAC (role-based access control) for PXC should be set up from the deploy/rbac.yamlfile. Briefly speaking, role-based access is based on specifically defined roles and actions corresponding to them, allowed to be done on specific Kubernetes resources (details about users and roles can be found in Kubernetes documentation).

   $ kubectl apply -f deploy/rbac.yaml
   

   Note: Setting RBAC requires your user to have cluster-admin role privileges. For example, those using Google Kubernetes Engine can grant user needed privileges with the following command: $ kubectl create clusterrolebinding cluster-admin-binding1 --clusterrole=cluster-admin --user=<myname@example.org>

   Finally it’s time to start the operator within Kubernetes:

   $ kubectl apply -f deploy/operator.yaml
   

5. Now that’s time to add the PXC Users secrets to Kubernetes. They should be placed in the data section of the deploy/secrets.yaml file as base64-encoded logins and passwords for the user accounts (see Kubernetes documentation for details).

   Note: the following command can be used to get base64-encoded password from a plain text string: $ echo -n 'plain-text-password' | base64

   After editing is finished, users secrets should be created (or updated with the new passwords) using the following command:

   $ kubectl apply -f deploy/secrets.yaml
   

   More details about secrets can be found in a separate section.

6. Optionally you can use deploy/configmap.yaml file to set Percona XtraDB Cluster configuration options. ConfigMap allows Kubernetes to pass configuration data inside the containerized application. If there were any changes, updated file can be applied with the following command:

      $ kubectl apply -f deploy/configmap.yaml
   

7. After the operator is started and user secrets are added, Percona XtraDB Cluster can be created at any time with the following command:

   $ kubectl apply -f deploy/cr.yaml
   

   Creation process will take some time. The process is over when both operator and replica set pod have reached their Running status:

   $ kubectl get pods
   NAME                                              READY   STATUS    RESTARTS   AGE
   cluster1-pxc-node-0                               1/1     Running   0          5m
   cluster1-pxc-node-1                               1/1     Running   0          4m
   cluster1-pxc-node-2                               1/1     Running   0          2m
   cluster1-pxc-proxysql-0                           1/1     Running   0          5m
   percona-xtradb-cluster-operator-dc67778fd-qtspz   1/1     Running   0          6m
   

8. Check connectivity to newly created cluster

   $ kubectl run -i --rm --tty percona-client --image=percona:5.7 --restart=Never -- bash -il
   percona-client:/$ mysql -h cluster1-pxc-proxysql -uroot -proot_password