Chapter 2. Starting the services

Procedure

1. In your OpenShift 4.x cluster, create a new project:

   $ oc new-project cdc-tutorial

2. Change to the directory where you downloaded the AMQ Streams 1.4 OpenShift installation and example files.

3. Deploy the AMQ Streams Cluster Operator.

   The Cluster Operator is responsible for deploying and managing Kafka clusters within an OpenShift cluster. This command deploys the Cluster Operator to watch just the project that you created:

   $ sed -i 's/namespace: .*/namespace: cdc-tutorial/' install/cluster-operator/*RoleBinding*.yaml
   
   $ oc apply -f install/cluster-operator -n cdc-tutorial

4. Verify that the Cluster Operator is running.

   This command shows that the Cluster Operator is running, and that all of the Pods are ready:

   $ oc get pods
   NAME                                       READY   STATUS    RESTARTS   AGE
   strimzi-cluster-operator-5c6d68c54-l4gdz   1/1     Running   0          46s

5. Deploy the Kafka cluster.

   This command uses the kafka-ephemeral-single.yaml Custom Resource to create an ephemeral Kafka cluster with three ZooKeeper nodes and one Kafka node:

   $ oc apply -f examples/kafka/kafka-ephemeral-single.yaml

6. Verify that the Kafka cluster is running.

   This command shows that the Kafka cluster is running, and that all of the Pods are ready:

   $ oc get pods
   NAME                                          READY   STATUS    RESTARTS   AGE
   my-cluster-entity-operator-5b5d4f7c58-8gnq5   3/3     Running   0          41s
   my-cluster-kafka-0                            2/2     Running   0          70s
   my-cluster-zookeeper-0                        2/2     Running   0          107s
   my-cluster-zookeeper-1                        2/2     Running   0          107s
   my-cluster-zookeeper-2                        2/2     Running   0          107s
   strimzi-cluster-operator-5c6d68c54-l4gdz      1/1     Running   0          8m53s

Procedure

1. Deploy the Kafka Connect Source-to-Image (S2I) service:

   This command deploys the Kafka Connect S2I service using the example YAML file for a single-node Kafka cluster:

   $ oc apply -f examples/kafka-connect/kafka-connect-s2i-single-node-kafka.yaml

2. Verify that the Kafka Connect service is running.

   This command shows that the Kafka Connect service is running, and that the Pod is ready:

   $ oc get pods -l strimzi.io/name=my-connect-cluster-connect
   NAME                                          READY   STATUS      RESTARTS   AGE
   my-connect-cluster-connect-1-dxcs9            1/1     Running     0          7m

3. Start a new build of the Kafka Connect image using the Debezium MySQL Connector plugin.

   This command uses the Debezium MySQL Connector plugin that you previously downloaded:

   $ oc start-build my-connect-cluster-connect --from-dir ./my-plugins/

4. Verify that the build has completed.

   This command shows that the new build is complete (my-connect-cluster-connect-2). The Debezium MySQL Connector is installed:

   $ oc get build
   NAME                           TYPE     FROM     STATUS     STARTED         DURATION
   my-connect-cluster-connect-1   Source            Complete   9 minutes ago   2m10s
   my-connect-cluster-connect-2   Source   Binary   Complete   4 minutes ago   2m2s

Procedure

1. Start a MySQL database.

   This command starts a MySQL database server preconfigured with an example inventory database:

   $ oc new-app --name=mysql debezium/example-mysql:1.0

2. Configure credentials for the MySQL database.

   This command updates the deployment configuration for the MySQL database to add the user name and password:

   $ oc set env dc/mysql MYSQL_ROOT_PASSWORD=debezium  MYSQL_USER=mysqluser MYSQL_PASSWORD=mysqlpw

3. Verify that the MySQL database is running.

   This command shows that the MySQL database is running, and that the Pod is ready:

   $ oc get pods -l app=mysql
   NAME            READY   STATUS    RESTARTS   AGE
   mysql-1-2gzx5   1/1     Running   1          23s

4. Open a new terminal and log into the sample inventory database.

   This command opens a MySQL command line client in the Pod that is running the MySQL database. It uses the user name and password that you previously configured:

   $ oc exec mysql-1-2gzx5 -it -- mysql -u mysqluser -p mysqlpw inventory
   mysql: [Warning] Using a password on the command line interface can be insecure.
   Reading table information for completion of table and column names
   You can turn off this feature to get a quicker startup with -A
   
   Welcome to the MySQL monitor.  Commands end with ; or \g.
   Your MySQL connection id is 7
   Server version: 5.7.29-log MySQL Community Server (GPL)
   
   Copyright (c) 2000, 2020, Oracle and/or its affiliates. All rights reserved.
   
   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>

5. List the tables in the inventory database.

   mysql> show tables;
   +---------------------+
   | Tables_in_inventory |
   +---------------------+
   | addresses           |
   | customers           |
   | geom                |
   | orders              |
   | products            |
   | products_on_hand    |
   +---------------------+
   6 rows in set (0.00 sec)

6. Explore the database and view the pre-loaded data.

   This example shows the customers table:

   mysql> select * from customers;
   +------+------------+-----------+-----------------------+
   | id   | first_name | last_name | email                 |
   +------+------------+-----------+-----------------------+
   | 1001 | Sally      | Thomas    | sally.thomas@acme.com |
   | 1002 | George     | Bailey    | gbailey@foobar.com    |
   | 1003 | Edward     | Walker    | ed@walker.com         |
   | 1004 | Anne       | Kretchmar | annek@noanswer.org    |
   +------+------------+-----------+-----------------------+
   4 rows in set (0.00 sec)