![]() If everything goes well, you’ll get the following output on the screen. conf/zoo.cfg is the zookeeper configuration file.QuorumPeerMain is the name of the main class that should be invoked to start the zookeeper.All these jar files comes with the zookeeper installation, and you don’t have to download them separately. This includes the zookeeper jar file, log4j, slf4j and slf4j-api jar files. Specify the jar files that should be included when zookeeper is started.On node1, execute the following command to start the single node zookeeper. We’ll modify this for our cluster setup later. cd $ZOOKEEPER_HOME/confįrom now on, we’ll use the zoo.cfg as our configuration file. On node1, use the zookeeper’s sample configuration file zoo_sample.cfg as baseline. This is using the latest zookeeper 3.4.9 version: ZOOKEEPER_HOME=/opt/zookeeper ![]() In this example, I’ve installed zookeeper under /opt/zookeeper directory. This way, we’ll isolate any non-cluster related issues and fix them first on the individual nodes. Verify: Start zookeeper in Standalone Mode for Testingīefore we start the zookeeper cluster, first start the zookeeper on the individual machine in a single node configuration (without cluster setup) to make sure it works properly. OpenJDK 64-Bit Server VM (build 25.91-b14, mixed mode) OpenJDK Runtime Environment (build 1.8.0_91-b14) Verify that the java is installed properly. The following will install the latest Java version on your system: JKD version 6 or above will work with Zookeeper. In this tutorial, we’ll setup zookeeper cluster with 3 node setup on the following servers: node1, node2, and node3.įor zookeeper, you should have java already installed on your system. For example, cluster with 3 nodes, or cluster with 5 nodes, etc. So, it is always recommended to run zookeeper cluster in odd number of servers. Zookeeper cluster is called as ensemble.įor a cluster to be always up and running, majority of the nodes in the cluster should be up. Now, let’s make the required changes in the zoo.cfg file as required in the next section.If you are running Apache zookeeper in your infrastructure, you should set it up to run in a cluster mode. Make a copy of the zoo_sample.cfg file present in the conf directory and rename it as zoo.cfg file. Now, let’s move into the conf directory in the extracted Zookeeper folder. Now, extract the downloaded ZooKeeper-3.4.6.tar.gz file on the system to start with ZooKeeper services. Once finished with downloading Zookeeper we can move on to the installation step. We can download the current stable version of ZooKeeper from any of the mirror website. This section covers the following topics, Highly reliable data registry − Availability of data even when one or a few nodes are down. ![]() This mechanism helps you in automatic fail recovery while connecting other distributed applications like Apache HBase. Locking and synchronization service − Locking the data while modifying it. ![]()
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