Install Percona server for MongoDB on Kubernetes

  1. Clone the percona-server-mongodb-operator repository:

    git clone -b v1.7.0 https://github.com/percona/percona-server-mongodb-operator
    cd percona-server-mongodb-operator
    

    Note

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

  2. The Custom Resource Definition for Percona Server for MongoDB should be created from the deploy/crd.yaml file. The Custom Resource Definition extends the standard set of resources which Kubernetes “knows” about with the new items, in our case these items are the core of the operator.

    $ kubectl apply -f deploy/crd.yaml
    

    This step should be done only once; the step does not need to be repeated with any other Operator deployments.

  3. Create a namespace and set the context for the namespace. The resource names must be unique within the namespace and provide a way to divide cluster resources between users spread across multiple projects.

    So, create the namespace and save it in the namespace context for subsequent commands 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 was modified.

  4. The role-based access control (RBAC) for Percona Server for MongoDB is configured with the deploy/rbac.yaml file. Role-based access is based on defined roles and the available actions which correspond to each role. The role and actions are defined for Kubernetes resources in the yaml file. Further 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-binding --clusterrole=cluster-admin --user=$(gcloud config get-value core/account)
    
  5. Start the operator within Kubernetes:

    $ kubectl apply -f deploy/operator.yaml
    
  6. Add the MongoDB Users secrets to Kubernetes. These secrets should be placed as plain text in the stringData section of the deploy/secrets.yaml file as login name and passwords for the user accounts (see Kubernetes documentation for details).

    After editing the yaml file, MongoDB Users secrets should be created using the following command:

    $ kubectl create -f deploy/secrets.yaml
    

    More details about secrets can be found in Users.

  7. 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.

  8. After the operator is started, Percona Server for MongoDB cluster can be created with the following command:

    $ kubectl apply -f deploy/cr.yaml
    

    The creation process may take some time. The process is over when all Pods have reached their Running status. You can check it with the following command:

    $ kubectl get pods
    

    The result should look as follows:

    NAME                                               READY   STATUS    RESTARTS   AGE
    my-cluster-name-cfg-0                              2/2     Running   0          11m
    my-cluster-name-cfg-1                              2/2     Running   1          10m
    my-cluster-name-cfg-2                              2/2     Running   1          9m
    my-cluster-name-mongos-55659468f7-2kvc2            1/1     Running   0          11m
    my-cluster-name-mongos-55659468f7-7jfqc            1/1     Running   0          11m
    my-cluster-name-mongos-55659468f7-dfwcj            1/1     Running   0          11m
    my-cluster-name-rs0-0                              2/2     Running   0          11m
    my-cluster-name-rs0-1                              2/2     Running   0          10m
    my-cluster-name-rs0-2                              2/2     Running   0          9m
    percona-server-mongodb-operator-6fc78d686d-26hdz   1/1     Running   0          37m
    
  9. Check connectivity to newly created cluster, using the login (which is userAdmin) and corresponding password from the secret:

    $ kubectl run -i --rm --tty percona-client --image=percona/percona-server-mongodb:4.4.3-5 --restart=Never -- bash -il
    percona-client:/$ mongo "mongodb://userAdmin:userAdmin123456@my-cluster-name-mongos.<namespace name>.svc.cluster.local/admin?ssl=false"
    

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