// Module included in the following assemblies:
//
// deploying/assembly_deploy-kafka-mirror-maker.adoc

[id='deploying-kafka-mirror-maker-{context}']
= Deploying Kafka MirrorMaker

[role="_abstract"]
This procedure shows how to deploy a Kafka MirrorMaker 2 cluster to your Kubernetes cluster using the Cluster Operator.

The deployment uses a YAML file to provide the specification to create a `KafkaMirrorMaker2` resource.
MirrorMaker 2 is based on Kafka Connect and uses its configuration properties. 

Strimzi provides xref:config-examples-{context}[example configuration files].
In this procedure, we use the following example file:

* `examples/mirror-maker/kafka-mirror-maker-2.yaml`

WARNING: When deploying multiple Kafka MirrorMaker 2 clusters managed by the Cluster Operator, deploy each cluster into a separate namespace.
Deploying multiple clusters in the same namespace can lead to naming conflicts and resource collisions.

.Prerequisites

* Cluster Operator is deployed.
* Kafka cluster is running.
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This procedure assumes that the Kafka cluster was deployed using Strimzi.

.Procedure

. Edit the deployment file to configure connection details (if required). 
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In `examples/mirror-maker/kafka-mirror-maker-2.yaml`, add or update the following properties as needed: 
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* `spec.clusters[].bootstrapServers` to specify the Kafka bootstrap address for the source and target clusters.
* `spec.clusters[].alias` to specify a unique identifier for each cluster.
* `spec.clusters[].authentication` to specify the authentication type for each cluster as `tls`, `scram-sha-256`, `scram-sha-512`, `plain`, or `oauth`. +
See the link:{BookURLConfiguring}#type-KafkaMirrorMaker2ClusterSpec-schema-reference[`KafkaMirrorMaker2Spec` schema properties^] for configuration details.
* `spec.clusters[].tls.trustedCertificates` to configure the TLS certificate for each cluster. +
Use `[]` (an empty array) to trust the default Java CAs, or specify secrets containing trusted certificates. +
See the link:{BookURLConfiguring}#con-common-configuration-trusted-certificates-reference[`trustedCertificates` properties^] for configuration details.

. Configure the deployment for multiple MirrorMaker 2 clusters (if required).
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If you plan to run more than one MirrorMaker 2 cluster in the same environment, each instance must use unique internal topic names and a unique group ID.
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Update the `spec.clusters[].config` properties in `kafka-mirror-maker-2.yaml` to replace the default values.
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See xref:con-config-mm2-multiple-instances-{context}[Configuring multiple MirrorMaker 2 clusters] for details.

. Deploy Kafka MirrorMaker to your Kubernetes cluster:
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[source,shell]
----
kubectl apply -f examples/mirror-maker/kafka-mirror-maker-2.yaml
----

. Check the status of the deployment:
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[source,shell]
----
kubectl get pods -n <my_cluster_operator_namespace>
----
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.Output shows the deployment name and readiness
[source,shell]
----
NAME                                    READY  STATUS   RESTARTS
my-mm2-cluster-mirrormaker2-<pod_id>    1/1    Running  1
----
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In this example, `my-mm2-cluster` is the name of the Kafka MirrorMaker 2 cluster.
A pod ID identifies each created pod.
By default, the deployment creates a single MirrorMaker 2 pod.
`READY` shows the number of ready versus expected replicas. 
The deployment is successful when the `STATUS` is `Running`.

[role="_additional-resources"]
.Additional resources

* xref:con-config-mirrormaker2-str[Kafka MirrorMaker 2 cluster configuration]