{"id":9027,"date":"2016-10-06T07:25:04","date_gmt":"2016-10-06T05:25:04","guid":{"rendered":"https:\/\/www.dbi-services.com\/blog\/running-a-cassandra-cluster-in-a-single-server\/"},"modified":"2016-10-06T07:25:04","modified_gmt":"2016-10-06T05:25:04","slug":"running-a-cassandra-cluster-in-a-single-server","status":"publish","type":"post","link":"https:\/\/www.dbi-services.com\/blog\/running-a-cassandra-cluster-in-a-single-server\/","title":{"rendered":"Running a Cassandra cluster in a single server"},"content":{"rendered":"<p>This blog post is about the configuration of Apache Cassandra for running a cluster of 3 instances on a single host. Basically C* is not really build to run in a multi instances environment, but for many cases and reasons you might run a C* cluster on a single server. The principal reason is for tests cases.<\/p>\n<h3>Context<\/h3>\n<p>The objective is to have a Cassandra ring of 3 instances on 1 host. For that, we will use:<\/p>\n<ul>\n<li>apache-cassandra-3.0.9 (community version)<\/li>\n<li>Separated disks for a segregation between binaries, data and logs: binaries, data and logs will be in separated mount points<\/li>\n<li>Multiple IPs interfaces for each instance (virtual interfaces in our case)<\/li>\n<li>Instances name: csd1, csd2, csd3<\/li>\n<li>Cluster name: dbitest<\/li>\n<\/ul>\n<h3>Binary installation<\/h3>\n<p>Download the binaries from the Apache website, http:\/\/www.apache.org\/dyn\/closer.lua\/cassandra\/3.0.9\/apache-cassandra-3.0.9-bin.tar.gz and install it. In this post we are going to install the 3.0.9 release.<\/p>\n<pre class=\"brush: bash; gutter: true; first-line: 1\">wget http:\/\/www.pirbot.com\/mirrors\/apache\/cassandra\/3.0.9\/apache-cassandra-3.0.9-bin.tar.gz<\/pre>\n<p>Extract it:<\/p>\n<pre class=\"brush: bash; gutter: true; first-line: 1\">tar -zxvf apache-cassandra-3.0.9-bin.tar.gz<\/pre>\n<p>Place the software into the product directory:<\/p>\n<pre class=\"brush: bash; gutter: true; first-line: 1\">cp \u2013r apache-cassandra-3.0.9 \/u00\/app\/cassandra\/product\/<\/pre>\n<h3><\/h3>\n<p>&nbsp;<\/p>\n<h3>Instances configuration<\/h3>\n<p>First, we will create the admin directory for each instance. The admin directory contains the following sub folders:<\/p>\n<ul>\n<li>\/u00\/app\/cassandra\/admin\/\n<ul>\n<li>\/backup: soft link to the backup mount point<\/li>\n<li>\/dump: soft link to the dump mount point<\/li>\n<li>\/etc: Cassandra configuration files, such as Cassandra.yaml, logback.xml and Cassandra-env.sh.<\/li>\n<li>\/log: soft link to the log file from the log mount point<\/li>\n<li>\/pid: contain the pid of the C* process<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>To create these directories, use the following loop.<\/p>\n<pre class=\"brush: bash; gutter: true; first-line: 1\">for i in 1 2 3 ;\ndo mkdir -p \/u00\/app\/cassandra\/admin\/csd$i &amp;&amp;\nmkdir \/u00\/app\/cassandra\/admin\/csd$i\/backup &amp;&amp;\nmkdir \/u00\/app\/cassandra\/admin\/csd$i\/dump &amp;&amp;\nmkdir \/u00\/app\/cassandra\/admin\/csd$i\/etc &amp;&amp;\nmkdir \/u00\/app\/cassandra\/admin\/csd$i\/log &amp;&amp;\nmkdir \/u00\/app\/cassandra\/admin\/csd$i\/pid &amp;&amp;\nmkdir \/u00\/app\/cassandra\/admin\/csd$i\/product;\ndone<\/pre>\n<p>Next copy the C* configuration files into each admin\/csd$i\/etc directory. Every instance has its own configuration files.<\/p>\n<pre class=\"brush: bash; gutter: true; first-line: 1\">for i in 1 2 3;\ndo cp -r \/u00\/app\/cassandra\/admin\/csd$i\/product\/apache-cassandra-3.0.9\/conf\/* \/u00\/app\/cassandra\/admin\/csd$i\/etc\/;\ndone<\/pre>\n<p>Now, create the three data directories for each instance.<\/p>\n<pre class=\"brush: bash; gutter: true; first-line: 1\">for i in 1 2 3;\ndo\nsudo mkdir -p \/u01\/cassandradata\/csd$i &amp;&amp;\nsudo chown -R cassandra:cassandra \/u01\/cassandradata\/csd$i;\ndone<\/pre>\n<p>Configure virtual network interfaces<\/p>\n<p>You must create additional virtual network interfaces for each C* instance, to use a different listen_address and rpc_address for each instance.<\/p>\n<pre class=\"brush: bash; gutter: true; first-line: 1\">sudo ifconfig enp0s3:0 192.168.56.105\nsudo ifconfig enp0s3:1 192.168.56.106<\/pre>\n<p>Then, you have 3 interfaces (default + 2 virtuals), for your C* instances.<\/p>\n<pre class=\"brush: bash; gutter: true; first-line: 1\">enp0s3: flags=4163&lt;UP,BROADCAST,RUNNING,MULTICAST&gt;\u00a0 mtu 1500\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 inet 192.168.56.104\u00a0 \u2026\n\nenp0s3:0: flags=4163&lt;UP,BROADCAST,RUNNING,MULTICAST&gt;\u00a0 mtu 1500\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 inet 192.168.56.105\u00a0 \u2026\n\nenp0s3:1: flags=4163&lt;UP,BROADCAST,RUNNING,MULTICAST&gt;\u00a0 mtu 1500\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 inet 192.168.56.106\u00a0 \u2026\n\nenp0s8: flags=4163&lt;UP,BROADCAST,RUNNING,MULTICAST&gt;\u00a0 mtu 1500\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u2026\n\nlo: flags=73&lt;UP,LOOPBACK,RUNNING&gt;\u00a0 mtu 65536\n\u2026<\/pre>\n<p>As all the required files are in place, we can now change the 3 main configuration files, to set up the three instances (csd1, csd2 and csd3).<\/p>\n<h4><span style=\"text-decoration: underline\">cassandra-env.sh:<\/span><\/h4>\n<p>Use a different \u201cJMX_PORT\u201d for each node. For instance: 7199 for csd1, 7299 for csd2 and 7399 for csd3.<\/p>\n<p>JMX will bind to the local host IP by default, you can use the default.<\/p>\n<h4><span style=\"text-decoration: underline\">cassandra.yaml<\/span><\/h4>\n<p>The central configuration file of Apache Cassandra. Change the following parameters:<\/p>\n<ul>\n<li>cluster_name: \u2018dbitest\u2019 All instances must have the same cluster name<\/li>\n<li>commitlog_directory: \/u01\/cassandradata\/csd$i\/commitlog<\/li>\n<li>data_file_directories:\/u01\/cassandradata\/csd$i\/data<\/li>\n<li>saved_caches_directory: \/u01\/cassandradata\/csd$i\/saved_caches<\/li>\n<li>listen_address: 192.168.56.104<\/li>\n<li>rpc_address: 192.168.56.104<\/li>\n<li>seeds: specify the list of IP of the seed nodes<\/li>\n<\/ul>\n<p><span style=\"text-decoration: underline\">logback.xml<\/span><\/p>\n<p>The configuration file for C* logs. Make the following changes:<\/p>\n<pre class=\"brush: bash; gutter: true; first-line: 1\">&lt;file&gt;${cassandra.logdir}\/system.log&lt;\/file&gt; to &lt;file&gt;\/u00\/app\/cassandra\/admin\/csd$i\/log\/system.log&lt;\/file&gt;\n\n&lt;fileNamePattern&gt;${cassandra.logdir}\/system.log.%i.zip&lt;\/fileNamePattern&gt; to \n&lt;fileNamePattern&gt;\/u00\/app\/cassandra\/admin\/csd$i\/log\/system.log.%i.zip&lt;\/fileNamePattern&gt;\n\n&lt;file&gt;${cassandra.logdir}\/debug.log&lt;\/file&gt; to &lt;file&gt;\/u00\/app\/cassandra\/admin\/csd$i\/debug.log&lt;\/file&gt;\n\n&lt;fileNamePattern&gt;${cassandra.logdir}\/debug.log.%i.zip&lt;\/fileNamePattern&gt; to\n&lt;fileNamePattern&gt;\/u00\/app\/cassandra\/admin\/csd1\/log\/debug.log.%i.zip&lt;\/fileNamePattern&gt;<\/pre>\n<p>Make the change for the three instances.<\/p>\n<h3>Starting the nodes<\/h3>\n<p>Before starting each node, you must dynamically set the environment variables for each of them.<\/p>\n<pre class=\"brush: bash; gutter: true; first-line: 1\">$CASSANDRA_HOME=\/u00\/app\/cassandra\/product\/apache-cassandra-3.0.9\n$CASSANDRA_CONF=\/u00\/app\/cassandra\/admin\/csd$i\/etc\/<\/pre>\n<p>After, setting the variables for each node you can start Apache Cassandra by command-line:<\/p>\n<pre class=\"brush: bash; gutter: true; first-line: 1\">.\/$CASSANDRA_HOME\/bin\/cassandra \u2013f<\/pre>\n<p>Execute the same command in a separated shell, for each node. Do not forget to set the environment variables $CASSANDRA_HOME and $CASSANDRA_CONF.<\/p>\n<h4>Cluster status<\/h4>\n<p>Verify the cluster status with nodetool utility. Check if all nodes are up and running.<\/p>\n<pre class=\"brush: bash; gutter: true; first-line: 1\">[cassandra@test bin]$ .\/nodetool status\n Datacenter: datacenter1\n =======================\n Status=Up\/Down|\/ State=Normal\/Leaving\/Joining\/Moving\n --\u00a0 Address\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Load\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Tokens\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Owns (effective)\u00a0 Host ID\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Rack\n UN\u00a0 192.168.56.104\u00a0 263.42 KB\u00a0 256\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 64.5%\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 cddee7f4-c0d5-4cba-9ddc-b773a08a9245\u00a0 rack1\n UN\u00a0 192.168.56.105\u00a0 212.19 KB\u00a0 256\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 67.5%\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 19cd17d2-1aeb-48e5-9299-7a0282c2e92e\u00a0 rack1\n UN\u00a0 192.168.56.106\u00a0 147.54 KB\u00a0 256\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 68.0%\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 f65d5b92-ed3b-4f68-b93d-72e6162eafca\u00a0 rack1<\/pre>\n<p>&nbsp;<\/p>\n<p>Enjoy \ud83d\ude09<\/p>\n","protected":false},"excerpt":{"rendered":"<p>This blog post is about the configuration of Apache Cassandra for running a cluster of 3 instances on a single host. Basically C* is not really build to run in a multi instances environment, but for many cases and reasons you might run a C* cluster on a single server. The principal reason is for [&hellip;]<\/p>\n","protected":false},"author":109,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[198],"tags":[946,947],"type_dbi":[],"class_list":["post-9027","post","type-post","status-publish","format-standard","hentry","category-database-management","tag-apache-cassandra","tag-nosql"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.2 (Yoast SEO v27.2) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Running a Cassandra cluster in a single server - dbi Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.dbi-services.com\/blog\/running-a-cassandra-cluster-in-a-single-server\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Running a Cassandra cluster in a single server\" \/>\n<meta property=\"og:description\" content=\"This blog post is about the configuration of Apache Cassandra for running a cluster of 3 instances on a single host. 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