Tuesday, May 31, 2016

How to setup Elasticsearch Custer in Centos

I have followed these steps in order to setup Elastic search in production.

# OS Requirements: Centos 6+ & Java 1.8+    

Installing Java --------------- Download JDK from : http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html tar xzvf jdk.tar.gz sudo mkdir /usr/local/java sudo mv jdk1.8.0_45 /usr/local/java/ sudo ln -s /usr/local/java/jdk1.8.0_45 /usr/local/java/jdk export PATH="$PATH:/usr/local/java/jdk/bin" export JAVA_HOME=/usr/local/java/jdk1.8.0_91/jre sudo sh -c "echo export JAVA_HOME=/usr/local/java/jdk1.8.0_91/jre >> /etc/environment"
Step2: ----- -----
Installing Elasticsearch ------------------------ wget https://download.elastic.co/elasticsearch/release/org/elasticsearch/distribution/rpm/elasticsearch/2.3.3/elasticsearch-2.3.3.rpm sudo rpm -ivh elasticsearch-2.3.3.rpm
Step 3: ------- -------
Configure Elasticsearch ----------------------- sudo vi /etc/elasticsearch/elasticsearch.yml [cluster name. common name given to all elasticsearch servers to join the same cluster] cluster.name: cluster_name # node.name: hostname-31 #[servername] node.master: false #[set true only for master node] node.data: true #[set true for all nodes, except for dedicated master node] # This is the path where all data is stored. Give one or multiple paths. # Directories must have permsission to user elasticsearch # chown elasticsearch:elasticsearch /home/es/ path.data: ["/home/es/data/es"] #This is the path where all log files are stored. # Directories must have permission to user elasticsearch #chown elasticsearch:elasticsearch /var/logs/es path.logs: /var/logs/es path.work: /home/es/work bootstrap.mlockall: true #[This setting is must for production] network.host: "hostname.com" #http.port: 9200 [9200 is default port. if needed modify this] #Enter all master nodes discovery.zen.ping.unicast.hosts: ["hostname.com"] # calculate by formula (total number of nodes / 2 + 1) discovery.zen.minimum_master_nodes: 3 # required for production node.max_local_storage_nodes: 1 # -------------------------------- Threads ------------------ threadpool.index.type: fixed threadpool.index.size: 40 threadpool.index.queue_size: 10000 threadpool.search.type: fixed threadpool.search.size: 40 threadpool.search.queue_size: 10000 threadpool.bulk.type: fixed threadpool.bulk.size: 40 threadpool.bulk.queue_size: 30000 #------------------ allocate memory for write -------------- indices.memory.index_buffer_size: 30% #------------------ shard -------------- cluster.routing.allocation.same_shard.host: true
Step 4: ------- -------
Configure Elasticsearch System Level Setting -------------------------------------------- # (Important setting) sudo vi /etc/sysconfig/elasticsearch #setheap size to maximum 32GB or Half of the RAM size ES_HEAP_SIZE=32g MAX_OPEN_FILES=65535 MAX_LOCKED_MEMORY=unlimited MAX_MAP_COUNT=262144
Step 5: ------- -------
Change number of open files -------------------------------------------- Change ulimit Setting: [http://stackoverflow.com/a/36142698/453486] ------------------------------------------------------------------- sudo vi /etc/security/limits.conf #add line: elasticsearch - nofile 65535
Step 6: ------- -------
disable swap ------------ sudo vi /etc/sysctl.conf #add lines: vm.swappiness=0 vm.max_map_count=262144
Step 7: ------- -------
Installing plugins for monitoring cluster ----------------------------------------- sudo /usr/share/elasticsearch/bin/plugin install mobz/elasticsearch-head sudo /usr/share/elasticsearch/bin/plugin install lmenezes/elasticsearch-kopf # reboot system for the system level settings to work. /sbin/reboot
Step 8: ------- -------
To Start/Stop/Restart Elasticsearch ------------------------------------ sudo /etc/init.d/elasticsearch start sudo /etc/init.d/elasticsearch stop sudo /etc/init.d/elasticsearch restart

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