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<title>Deploying Debezium on Google Kubernetes Engine - Justin Naldzin</title>
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<h1>Overview</h1>
<p><a href="https://cloud.google.com/kubernetes-engine/">Google Kubernetes Engine</a> provides a managed environment for deploying, managing, and scaling your containerized applications using Google infrastructure. The environment Kubernetes Engine provides consists of multiple machines (specifically, Google Compute Engine instances) grouped together to form a container cluster.</p>
<p align="center">
<img src="images/logos/gcp_containerengine.png" alt="Google Cloud Platform" hspace="50">
</p>
<p><a href="http://debezium.io">Debezium</a> is an open source distributed platform for <a href="https://en.wikipedia.org/wiki/Change_data_capture">change data capture</a>. Start it up, point it at your databases, and your apps can start responding to all of the inserts, updates, and deletes that other apps commit to your databases. Debezium is durable and fast, so your apps can respond quickly and never miss an event, even when things go wrong.</p>
<h2>Setup</h2>
<p>The following assumes you have already followed the instructions for <a href="configuring-gcloud">configuring gcloud</a>.</p>
<h4>Activate gcloud configuration</h4>
<div class="highlight"><pre><span></span>gcloud config configurations list
gcloud config configurations activate default
</pre></div>
<h4>Create a Kubernetes cluster</h4>
<div class="highlight"><pre><span></span><span class="nv">PROJECT_ID</span><span class="o">=</span>my-project_id
<span class="nv">CLUSTER_NAME</span><span class="o">=</span>test-cluster1
gcloud container clusters create <span class="nv">$CLUSTER_NAME</span> <span class="se">\</span>
--machine-type <span class="s2">"n1-standard-2"</span> <span class="se">\</span>
--cluster-version <span class="s2">"1.8.8-gke.0"</span> <span class="se">\</span>
--project <span class="nv">$PROJECT_ID</span>
</pre></div>
<p>Creating a cluster on Google Kubernetes Engine generates a kubeconfig entry and automatically switches to that context.</p>
<h4>Show kubectl contexts</h4>
<div class="highlight"><pre><span></span>kubectl config get-contexts
kubectl config use-context <gke_project_region_cluster>
</pre></div>
<h4>Manual kubectl configuration</h4>
<p>If you created a cluster using GCP Console or using gcloud on a different machine, you need to make the cluster's credentials available to <code>kubectl</code> in your current environment.</p>
<p>To pass the cluster's credentials to <code>kubectl</code>, run the following command:</p>
<div class="highlight"><pre><span></span>gcloud container clusters get-credentials <span class="nv">$CLUSTER_NAME</span>
</pre></div>
<p>This also automatically switches to that context.</p>
<h4>Show kubectl contexts</h4>
<div class="highlight"><pre><span></span>kubectl config get-contexts
kubectl config use-context <gke_project_region_cluster>
</pre></div>
<h4>View cluster info</h4>
<div class="highlight"><pre><span></span>kubectl cluster-info
</pre></div>
<h4>Clone Debezium Kubernetes repo</h4>
<div class="highlight"><pre><span></span>git clone https://github.com/debezium/debezium-kubernetes.git
<span class="nb">cd</span> debezium-kubernetes
</pre></div>
<blockquote>
<p>NOTE: The <code>debezium-kubernetes</code> repo uses outdated docker images and an outdated fabric8 version. Need to update each <code>pom.xml</code> file:</p>
</blockquote>
<ul>
<li>Change the docker images from <code>0.1-SNAPSHOT</code> to <code>0.8-SNAPSHOT</code></li>
</ul>
<div class="highlight"><pre><span></span><span class="nt"><groupId></span>io.debezium<span class="nt"></groupId></span>
<span class="nt"><version></span>0.8-SNAPSHOT<span class="nt"></version></span>
</pre></div>
<ul>
<li>Change the fabric 8 version from <code>2.2.115</code> to <code>2.2.215</code></li>
</ul>
<div class="highlight"><pre><span></span><span class="nt"><fabric8.version></span>2.2.215<span class="nt"></fabric8.version></span>
</pre></div>
<h4>Build with Maven</h4>
<div class="highlight"><pre><span></span>mvn clean install
</pre></div>
<h4>Deploy with Maven</h4>
<div class="highlight"><pre><span></span>mvn fabric8:apply
</pre></div>
<h4>Get pod details</h4>
<div class="highlight"><pre><span></span>kubectl get pods
kubectl describe pods
</pre></div>
<h2>Kafka</h2>
<h4>Create a <code>schema-changes</code> topic for Debezium's MySQL connector</h4>
<div class="highlight"><pre><span></span><span class="nv">DB_NAME</span><span class="o">=</span>ticketmonster
<span class="nv">TOPIC</span><span class="o">=</span>schema-changes.<span class="nv">$DB_NAME</span>
<span class="nv">KAFKA_POD_NAME</span><span class="o">=</span><span class="k">$(</span>kubectl get pod <span class="p">|</span> grep -i running <span class="p">|</span> grep ^kafka-0 <span class="p">|</span> awk <span class="s1">'{ print $1 }'</span><span class="k">)</span>
kubectl <span class="nb">exec</span> <span class="nv">$KAFKA_POD_NAME</span> -- /usr/bin/kafka-topics --create --zookeeper zk-0.zk-svc.default.svc.cluster.local:2181 --replication-factor <span class="m">3</span> --partitions <span class="m">1</span> --topic <span class="nv">$TOPIC</span>
</pre></div>
<h2>MySQL</h2>
<h4>Connect to the MySQL command line</h4>
<div class="highlight"><pre><span></span><span class="nv">MYSQL_POD_NAME</span><span class="o">=</span><span class="k">$(</span>kubectl get pod <span class="p">|</span> grep Running <span class="p">|</span> grep ^mysql-0 <span class="p">|</span> awk <span class="s1">'{ print $1 }'</span><span class="k">)</span>
<span class="nv">MYSQL_POD_IP</span><span class="o">=</span><span class="k">$(</span>kubectl describe pod <span class="nv">$MYSQL_POD_NAME</span> <span class="p">|</span> grep IP <span class="p">|</span> awk <span class="s1">'{ print $2 }'</span><span class="k">)</span>
kubectl <span class="nb">exec</span> -it <span class="nv">$MYSQL_POD_NAME</span> -- /opt/rh/rh-mysql56/root/usr/bin/mysql -h<span class="nv">$MYSQL_POD_IP</span> -P3306 -uroot -padmin
</pre></div>
<h4>Execute SQL</h4>
<p>Skip this (see note below)</p>
<div class="highlight"><pre><span></span>#kubectl exec -it $MYSQL_POD_NAME -- bash -c "curl -s -L https://gist.github.com/christian-posta/e20ddb5c945845b4b9f6eba94a98af09/raw | /opt/rh/rh-mysql56/root/usr/bin/mysql -h$MYSQL_POD_IP -P3306 -uroot -padmin"
</pre></div>
<blockquote>
<p>NOTE: The <code>GRANT</code> statements from the above script breaks replication. Also this script references a different <code>inventory</code> database than the <code>ticketmonster</code> database that the <code>mysql56</code> image includes.</p>
</blockquote>
<p>Instead use these statements that work</p>
<div class="highlight"><pre><span></span><span class="k">GRANT</span> <span class="k">SELECT</span><span class="p">,</span> <span class="n">RELOAD</span><span class="p">,</span> <span class="k">SHOW</span> <span class="n">DATABASES</span><span class="p">,</span> <span class="n">REPLICATION</span> <span class="n">SLAVE</span><span class="p">,</span> <span class="n">REPLICATION</span> <span class="n">CLIENT</span> <span class="k">ON</span> <span class="o">*</span><span class="p">.</span><span class="o">*</span> <span class="k">TO</span> <span class="s1">'replicator'</span> <span class="n">IDENTIFIED</span> <span class="k">BY</span> <span class="s1">'replpass'</span><span class="p">;</span>
<span class="k">GRANT</span> <span class="k">ALL</span> <span class="k">PRIVILEGES</span> <span class="k">ON</span> <span class="n">ticketmonster</span><span class="p">.</span><span class="o">*</span> <span class="k">TO</span> <span class="s1">'ticket'</span><span class="o">@</span><span class="s1">'%'</span><span class="p">;</span>
<span class="n">USE</span> <span class="n">ticketmonster</span><span class="p">;</span>
</pre></div>
<p>Proceed with the rest of the SQL script located <a href="https://gist.github.com/christian-posta/e20ddb5c945845b4b9f6eba94a98af09/raw">here</a>.</p>
<h2>Start Kafka Connect and Debezium</h2>
<h4>Expose API</h4>
<h6>In a new shell</h6>
<p>Expose the API for the Kafka Connect cluster via pod port-forwarding (forward the pod's 8083 port to our local machine)</p>
<div class="highlight"><pre><span></span><span class="nv">CONNECT_POD_NAME</span><span class="o">=</span><span class="k">$(</span>kubectl get pod <span class="p">|</span> grep -i running <span class="p">|</span> grep ^connect-0 <span class="p">|</span> awk <span class="s1">'{ print $1 }'</span><span class="k">)</span>
kubectl port-forward <span class="nv">$CONNECT_POD_NAME</span> <span class="m">8083</span>:8083
</pre></div>
<h4>View Kafka Connect logs</h4>
<h6>In a new shell</h6>
<div class="highlight"><pre><span></span><span class="nv">CONNECT_POD_NAME</span><span class="o">=</span><span class="k">$(</span>kubectl get pod <span class="p">|</span> grep -i running <span class="p">|</span> grep ^connect-0 <span class="p">|</span> awk <span class="s1">'{ print $1 }'</span><span class="k">)</span>
kubectl logs -f <span class="nv">$CONNECT_POD_NAME</span>
</pre></div>
<h4>Create a Debezium connector using the Kafka Connect service's REST API</h4>
<div class="highlight"><pre><span></span>curl -i -X POST -H <span class="s2">"Accept:application/json"</span> -H <span class="s2">"Content-Type:application/json"</span> http://localhost:8083/connectors/ -d <span class="s1">'{ "name": "ticketmonster-connector", "config": { "connector.class": "io.debezium.connector.mysql.MySqlConnector", "tasks.max": "1", "database.hostname": "'</span><span class="s2">"</span><span class="nv">$MYSQL_POD_IP</span><span class="s2">"</span><span class="s1">'", "database.port": "3306", "database.user": "replicator", "database.password": "replpass", "database.server.id": "184054", "database.server.name": "mysql-server-1", "database.binlog": "mysql-bin.000001", "database.whitelist": "ticketmonster", "database.history.kafka.bootstrap.servers": "kafka-0.kafka-svc.default.svc.cluster.local:9093", "database.history.kafka.topic": "schema-changes.ticketmonster" } }'</span>
</pre></div>
<h4>Consume all event streams from the Kafka topic</h4>
<div class="highlight"><pre><span></span><span class="nv">KAFKA_POD_NAME</span><span class="o">=</span><span class="k">$(</span>kubectl get pod <span class="p">|</span> grep -i running <span class="p">|</span> grep ^kafka-0 <span class="p">|</span> awk <span class="s1">'{ print $1 }'</span><span class="k">)</span>
kubectl <span class="nb">exec</span> <span class="nv">$KAFKA_POD_NAME</span> -- /usr/bin/kafka-console-consumer --bootstrap-server kafka-0.kafka-svc.default.svc.cluster.local:9093 --topic mysql-server-1.ticketmonster.customers --from-beginning --property print.key<span class="o">=</span><span class="nb">true</span>
kubectl <span class="nb">exec</span> <span class="nv">$KAFKA_POD_NAME</span> -- /usr/bin/kafka-console-consumer --bootstrap-server kafka-1.kafka-svc.default.svc.cluster.local:9093 --topic mysql-server-1.ticketmonster.customers --from-beginning --property print.key<span class="o">=</span><span class="nb">true</span>
</pre></div>
<h4>List Kafka topics</h4>
<div class="highlight"><pre><span></span>kubectl <span class="nb">exec</span> <span class="nv">$KAFKA_POD_NAME</span> -- /usr/bin/kafka-topics --list --zookeeper zk-0.zk-svc.default.svc.cluster.local:2181
</pre></div>
<h4>Delete connector</h4>
<div class="highlight"><pre><span></span>curl -X DELETE http://localhost:8083/connectors/ticketmonster-connector
</pre></div>
<h2>Cleanup</h2>
<h4>Delete all resources</h4>
<div class="highlight"><pre><span></span>kubectl delete configmaps,statefulsets,services,deployments,pods,secrets,serviceaccounts,roles,rolebindings,pvc --all
</pre></div>
<h4>Delete the cluster</h4>
<p>Delete the Kubernetes Engine container cluster using the gcloud command-line tool</p>
<div class="highlight"><pre><span></span>gcloud container clusters delete <span class="nv">$CLUSTER_NAME</span>
</pre></div>
<p>This also deletes the entries in the <code>kubectl</code> configuration.</p>
<h4>Manually delete kubectl configuration</h4>
<p>To delete the <code>kubectl</code> entries manually, delete the cluster and context and unset the user from <code>kubectl</code> config</p>
<div class="highlight"><pre><span></span>kubectl config delete-cluster <gke_project_region_cluster>
kubectl config delete-context <gke_project_region_cluster>
kubectl config <span class="nb">unset</span> users.<gke_project_region_cluster>
</pre></div>
<h4>Check kubectl configuration</h4>
<div class="highlight"><pre><span></span>cat ~/.kube/config
</pre></div>
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