How to Install KairosDB on OpenBSD

KairosDB is a distributed scalable time-series database that is designed to handle large amounts of time-stamped data. In this tutorial, we will learn how to install KairosDB on OpenBSD.

Prerequisites

  • OpenBSD installation
  • Root access to the system
  • Basic knowledge of OpenBSD commands

Step 1: Install Java

KairosDB requires Java to run. OpenBSD comes with OpenJDK as the default Java implementation. If not installed, run the following command to install OpenJDK:

$ doas pkg_add openjdk8

Step 2: Install Cassandra

KairosDB uses Apache Cassandra as the backend database. To install Cassandra, run the following command:

$ doas pkg_add apache-cassandra

Step 3: Install KairosDB

KairosDB is not available in the OpenBSD package repositories. Hence, we need to download it from the GitHub repository. Before downloading, make sure that the Git command is installed on the system. To install Git, run the following command:

$ doas pkg_add git

Once installed, clone the KairosDB repository from GitHub:

$ git clone https://github.com/kairosdb/kairosdb.git

Once downloaded, navigate to the KairosDB directory and build the project using the Gradle build tool:

$ cd kairosdb
$ ./gradlew build

Step 4: Configure KairosDB

KairosDB comes with a default configuration file named kairosdb.properties. Copy this configuration file to the /opt/kairosdb/conf directory as the main configuration file:

$ sudo mkdir -p /opt/kairosdb/conf
$ sudo cp conf/kairosdb.properties /opt/kairosdb/conf

Next, edit the configuration file to set the Cassandra hosts and ports. Open the kairosdb.properties file with a text editor:

$ sudo vi /opt/kairosdb/conf/kairosdb.properties

Set the following properties in the file:

kairosdb.datastore.cassandra.host_list = 127.0.0.1:9160
kairosdb.jetty.port = 8080

Save and close the file.

Step 5: Start KairosDB

To start KairosDB, navigate to the KairosDB directory and run the following command:

$ ./bin/kairosdb.sh start

This will start KairosDB as a background process.

Step 6: Verify the Installation

To verify the installation, open a web browser and navigate to http://<your-server-ip>:8080. You should see the KairosDB Web UI. Try creating a new metric and adding some data to it.

Conclusion

In this tutorial, we learned how to install KairosDB on OpenBSD. KairosDB is a powerful time-series database that can handle large amounts of data. With this installation, you can start building time-series applications on OpenBSD.