To run Kafka in the background on Ubuntu, you can use the following steps:

 To run Kafka in the background on Ubuntu, you can use the following steps:

1. Open a terminal.

2. Navigate to the Kafka installation directory. For example, if you have installed Kafka in the `/opt/kafka` directory, use the following command:

```bash

cd /opt/kafka

```

3. Start ZooKeeper in the background:

```bash

nohup bin/zookeeper-server-start.sh config/zookeeper.properties > zookeeper.log 2>&1 &

```

The `nohup` command is used to run a command in the background and keep it running even if you close the terminal.

4. Start Kafka in the background:

```bash

nohup bin/kafka-server-start.sh config/server.properties > kafka.log 2>&1 &

```

This command starts Kafka in the background, and any output or error messages are redirected to `kafka.log`.

Now, Kafka is running in the background as a daemon process. To verify that it's running, you can check the contents of the log files:

```bash

tail -f zookeeper.log

tail -f kafka.log

```

The `tail -f` command allows you to continuously monitor the log files for any new output.

If you want to stop Kafka and ZooKeeper, you can use the following commands:

```bash

bin/kafka-server-stop.sh

bin/zookeeper-server-stop.sh

```

These commands will stop Kafka and ZooKeeper gracefully.

With Kafka running in the background, you can now produce and consume messages from your topics as needed, and the Kafka server will continue to run even if you close the terminal session.

For example, you can use the following command to check if the Kafka broker is up and running:

kafkacat -b 18.215.201.15:9092 -L