Install Percona XtraDB Cluster on Kubernetes¶
First of all, clone the percona-xtradb-cluster-operator repository:
git clone -b v1.4.0 https://github.com/percona/percona-xtradb-cluster-operator cd percona-xtradb-cluster-operator
It is crucial to specify the right branch with
-boption while cloning the code on this step. Please be careful.
Now Custom Resource Definition for PXC should be created from the
deploy/crd.yamlfile. 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
The next thing to do is to add the
pxcnamespace 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
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
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-binding --clusterrole=cluster-admin --user=$(gcloud config get-value core/account)
Finally it’s time to start the operator within Kubernetes:
$ kubectl apply -f deploy/operator.yaml
Now that’s time to add the PXC Users secrets to Kubernetes. They should be placed in the data section of the
deploy/secrets.yamlfile as logins and base64-encoded passwords for the user accounts (see Kubernetes documentation for details).
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 Users.
Now certificates should be generated. By default, the Operator generates certificates automatically, and no actions are required at this step. Still, you can generate and apply your own certificates as secrets according to the TLS instructions.
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-0 1/1 Running 0 5m cluster1-pxc-1 1/1 Running 0 4m cluster1-pxc-2 1/1 Running 0 2m cluster1-proxysql-0 1/1 Running 0 5m percona-xtradb-cluster-operator-dc67778fd-qtspz 1/1 Running 0 6m
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-proxysql -uroot -proot_password