docker/docker-sink-pull/README.adoc

= Camel-Kafka-connector Docker Sink Pull

This is an example for Camel-Kafka-connector Docker Sink Pull

== Standalone

=== What is needed

- A Docker daemon

=== Running Kafka

[source]
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$KAFKA_HOME/bin/zookeeper-server-start.sh $KAFKA_HOME/config/zookeeper.properties
$KAFKA_HOME/bin/kafka-server-start.sh $KAFKA_HOME/config/server.properties
$KAFKA_HOME/bin/kafka-topics.sh --create --bootstrap-server localhost:9092 --replication-factor 1 --partitions 1 --topic mytopic
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=== Download the connector package

Download the connector package tar.gz and extract the content to a directory. In this example we'll use `/home/oscerd/connectors/`

[source]
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> cd /home/oscerd/connectors/
> wget https://repo1.maven.org/maven2/org/apache/camel/kafkaconnector/camel-docker-kafka-connector/0.11.5/camel-docker-kafka-connector-0.11.5-package.tar.gz
> untar.gz camel-docker-kafka-connector-0.11.5-package.tar.gz
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=== Configuring Kafka Connect

You'll need to set up the `plugin.path` property in your kafka

Open the `$KAFKA_HOME/config/connect-standalone.properties` and set the `plugin.path` property to your choosen location:

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...
plugin.path=/home/oscerd/connectors
...
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=== Setup the connectors

Open the Docker configuration file at `$EXAMPLES/docker/docker-sink-pull/config/CamelDockerSinkConnector.properties`

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name=CamelDockerSinkConnector
connector.class=org.apache.camel.kafkaconnector.docker.CamelDockerSinkConnector
tasks.max=1

key.converter=org.apache.kafka.connect.storage.StringConverter
value.converter=org.apache.kafka.connect.storage.StringConverter

topics=mytopic

camel.component.docker.host=/var/run/docker.sock
camel.component.docker.socket=true
camel.sink.path.operation=imagepull
camel.sink.endpoint.repository=memcached
camel.sink.endpoint.tag=latest
camel.sink.endpoint.username=<username>
camel.sink.endpoint.password=<password>
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In this case we are using local unix socket.

Add the correct information for username and password.

=== Running the example

Run the kafka connect with the Docker Source connector:

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$KAFKA_HOME/bin/connect-standalone.sh $KAFKA_HOME/config/connect-standalone.properties $EXAMPLES/docker/docker-sink-pull/config/CamelDockerSinkConnector.properties
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We just need to trigger the operation through a message

On a different terminal run the kafkacat producer

[source]
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> echo "test" | ./kafkacat -b localhost:9092 -t mytopic
% Auto-selecting Producer mode (use -P or -C to override)
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After a while we should get a new memcached image in our Docker

[source]
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> docker images
REPOSITORY                                                               TAG                 IMAGE ID            CREATED             SIZE
memcached                                                                latest              9f547b64a127        7 days ago          82.4MB
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You can use a different approach and define everything through headers. In this case the correct configuration for the connector would be

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name=CamelDockerSinkConnector
connector.class=org.apache.camel.kafkaconnector.docker.CamelDockerSinkConnector
tasks.max=1

key.converter=org.apache.kafka.connect.storage.StringConverter
value.converter=org.apache.kafka.connect.storage.StringConverter

topics=mytopic

camel.component.docker.host=/var/run/docker.sock
camel.component.docker.socket=true
camel.sink.path.operation=imagepull
camel.sink.endpoint.username=<username>
camel.sink.endpoint.password=<password>
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And then send the following message

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> echo "test" | ./kafkacat -b localhost:9092 -t mytopic -H "CamelHeader.CamelDockerRepository=openjdk" -H "CamelHeader.CamelDockerTag=15.0.2-jdk"
% Auto-selecting Producer mode (use -P or -C to override)
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After a while you should see

[source]
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> docker images
REPOSITORY                                                               TAG                 IMAGE ID            CREATED             SIZE
openjdk                                                                  15.0.2-jdk          84a383f5b038        13 hours ago        486MB
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