localhost:9092kafkalocalhost9092kafkaKAFKA_ADVERTISED_LISTENERSlocalhost9092brokerslocalhost . Using LoadBalancer services or using NodePort services. There are two ways of configuring external access. Many cloud providers differentiate between public and internal load balancers. For more complex networking, this might be an IP address associated with a given network interface on a machine. The default is 0.0.0.0, which means listening on all interfaces. But if you have a complex network, for example, consider if your cluster is on the cloud which has an internal network, and also external IP on which rest of the work can connect to your cluster, in that case, you have to set advertised.listeners property . ZooKeeper docker-compose up -d to setup project. For more complex networking, this might be an IP address associated with a given network interface on a machine. While working with the Kafka listeners, we need to set the "advertised.listeners" property. listeners KAFKA_LISTENERS is a comma-separated list of listeners and the host/IP and port to which Kafka binds to for listening. To disable the external access via load balancers: kubectl kudo . the initial connection occurs on 7000 but then Kafka reports back to the client that it should be using the PRIVATE listener and the traffic reconnects onto the 6000 Private port range (confirmed with tcpdump). The Kafka broker will receive the number of messages by the Kafka topics. We need to set the listener configuration correctly. Teams. Q&A for work. To configure an external listener that uses the NodePort access method, complete the following steps. /bin/kafka-console-consumer --topic topic-name --from . Edit the KafkaCluster custom resource. It changes only the port number used in the advertised.listeners Kafka broker configuration parameter.. Internal load balancers. listener.name.internal. Additionally, a specific service per kafka pod will be created. We can create a property file with all the . So for all internal cluster communication happens over what you set in listeners property. Then for each, it defines the port to listen to and the hostname to advertise in metadata responses. In order to access Kafka Brokers from outside the cluster, an additional listener and advertised listener must be configured. Learn more about Teams # Configure Kafka to advertise IP addresses instead of FQDN HOST_FQDN=$ (hostname -f) To enable the external access via node ports: kubectl kudo update --instance=kafka-instance \ -p EXTERNAL_ADVERTISED_LISTENER=true \ -p EXTERNAL_ADVERTISED_LISTENER_TYPE=NodePort. KAFKA_LISTENERS is a comma-separated list of listeners, and the host/ip and port to which Kafka binds to on which to listen. Using the NodePort access method, external listeners make Kafka brokers accessible through either the external IP of a Kubernetes cluster's node, or on an external IP that routes into the cluster. Next commands should be executed on the kafka container, so first log in into the container by typing: docker-compose exec kafka bash to enter kafka`. The default is 0.0.0.0, which means listening on all interfaces. listeners Since we will exposing our application to the public Internet, we need. This maps 2 names EXTERNAL and INTERNAL (you can use any name you like, I just reused names from your question) to the PLAINTEXT security protocol. To use the protocol, you must specify one of the four authentication methods supported by Apache Kafka: GSSAPI, Plain, SCRAM-SHA-256/512, or OAUTHBEARER. Just keep in mind that the advertisedPort option doesn't really change the port used in the load balancer itself. The default access method for external listeners is LoadBalancer, thus, in the example below, accessMethod: LoadBalancer. This is fine when you are connecting in from within an AWS account as that is what this port range and listener is for but from a . SASL-SSL (Simple Authentication and Security Layer) uses TLS encryption like SSL but differs in its authentication process. The public load balancers will get a public IP address and DNS name . /bin/kafka-topics --create --topic topic-name --bootstrap-server localhost:9092 - will create topic. can be omitted from the external listener config: listenersConfig: externalListeners: - type: "plaintext" name: "external1" externalStartingPort: 19090 containerPort: 9094 accessMethod: LoadBalancer. This allows users to switch on and off the nodeports access for an already running KUDO Kafka cluster. * properties are only applicable if you have INTERNAL:// as a listeners configuration, and you want to override the default. From docs. One of the main reasons you might choose SASL-SSL over SSL is . For the CLIENT listener example, the broker would first look for client.KafkaServer with a fallback to KafkaServer, if necessary. Otherwise, all listeners will use ssl.endpoint.identification.algorithm. listeners Instead of creating separate CGROUP for each Broker node in Kafka cluster, we can use kafka env to make it working. To configure Kafka to advertise FQDN and listening on all the IP addresses, add the following text to the bottom of the kafka-env-template. The default is 0.0.0.0, which means listening on all interfaces. KAFKA_LISTENERS is a comma-separated list of listeners and the host/IP and port to which Kafka binds to for listening. For more complex networking this might be an IP address associated with a given network interface on a machine. Connect and share knowledge within a single location that is structured and easy to search. Different security (SSL and SASL) settings can be configured for each listener by adding a normalised prefix (the listener name is lowercased) to the config name. We will extend this so that the broker first looks for an entry with a lowercased listener name followed by a dot as a prefix to the existing name. The Apache Kafka is nothing but a massaging protocol. In this post, we will do a step-by-step configuration of the strimzi-operator & use Openshift routes as an external listener with security: SASL_SSL. As Kafka distinguished the source of your connections (INTERNAL vs EXTERNAL) by port (e.g., in my case, any connection to the docker container port 9092 would be seen as internal and any connection to port 19092 would be seen as external), the advertised IP addressed will be the one that corresponds to the port (e.g., if you do a connection to . The broker currently looks for an entry named KafkaServer. To make Kafka accessible to external client applications, we added an external listener of type loadbalancer.
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