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Solr running with Tomcat on Docker

Automated SolrCloud Bootstrap with Solr 4.10.0 running on Apache Tomcat 7.0.59 and cluster managed with ZooKeeper 3.4.6.

sudo is required for native Linux docker installations. sudo docker pull tampakis/solr_tomcat

Adapted from raycoding/piggybank-solr-tomcat with orangelight-specific configuration.. The zookeeper image which manages the SolrCloud cluster is defined at tampakis/zookeeper.

This image is linked on Docker Hub and Github under images/solr_tomcat. There are additional config files and scripts located there required for the build.

Starting SolrCloud

  • Start zookeeper
    • sudo docker run --name zookeeper -dit -p 8383:8383 -p 2181:2181 -p 2888:2888 -p 3888:3888 -e HOSTNAME=127.0.0.1 tampakis/zookeeper
  • For the first Nodes, we will simultaneously also upload the solr configuration into ZooKeeper using Zookeeper Command Line Interface tools shipped with Solr and is available in this docker image at /solr-zk-cli
    • sudo docker run --link zookeeper:ZK --name=nodeA -dit -p 8984:8080 -e 'SOLR_OPTS="-DzkHost=$ZK_PORT_2181_TCP_ADDR:$ZK_PORT_2181_TCP_PORT"' tampakis/solr_tomcat:4.10.0 /bin/bash -c 'java -classpath .:/solr-zk-cli/* org.apache.solr.cloud.ZkCLI -cmd upconfig -zkhost $ZK_PORT_2181_TCP_ADDR:$ZK_PORT_2181_TCP_PORT -confdir /solr-home/blacklight-core/conf -confname example ; /usr/lib/apache-tomcat-7.0.59/bin/catalina.sh run'
  • In the above step we reference zookeeper container as created in step 1 as ZK in our new container for running tomcat and solr node. ZK_* environment variables in the container are used to locate the ZooKeeper container with zkHost params. We only need to upload solr configuration once to ZooKeeper.
  • Second Node, sudo docker run --link zookeeper:ZK --name=nodeB -dit -p 8985:8080 -e 'SOLR_OPTS="-DzkHost=$ZK_PORT_2181_TCP_ADDR:$ZK_PORT_2181_TCP_PORT"' tampakis/solr_tomcat:4.10.0 /bin/bash -c '/usr/lib/apache-tomcat-7.0.59/bin/catalina.sh run'
  • Third Node, sudo docker run --link zookeeper:ZK --name=nodeC -dit -p 8986:8080 -e 'SOLR_OPTS="-DzkHost=$ZK_PORT_2181_TCP_ADDR:$ZK_PORT_2181_TCP_PORT"' tampakis/solr_tomcat:4.10.0 /bin/bash -c '/usr/lib/apache-tomcat-7.0.59/bin/catalina.sh run'
  • Now that we have uploaded our solr configurations and three nodes are ready to serve, we can create a new collection in Solr Cloud
    • From you local host machine run curl "http://localhost:8984/solr/admin/collections?action=CREATE&name=orangelight&numShards=3&replicationFactor=2&maxShardsPerNode=2" or paste the same in browser.
  • Voila you have Solr Cloud setup! http://localhost:8984/solr, http://localhost:8985/solr, http://localhost:8986/solr

Tomcat/Solr Port and Memory Management

The tomcat defualt port 8080 is used on the individual solr instances. This can be changed by uncommenting the RUN sed -i s/8080/8983/g /usr/lib/$TOMCAT/conf/server.xml line in the Dockerfile. That command would change the port to 8983. The port would also need to be changed in the SOLR_OPTS set in the apache_tomcat_setenv.sh file located in the Github repository along with this image. That file also will be where we can tweak the memory options for the server.

Changing Versions of Solr or Tomcat

To change the versions of Solr and Tomcat, set the desired version in the appropriate SOLR_VERSION and TOMCAT_VERSION environment variables in the Dockerfile. The $TOMCAT_HOME/conf/Catalina/localhost/solr.xml file needs to be updated with the correct Tomcat version in the echo command in setting the Orangelight-specific config of the Dockerfile. The Tomcat version would also need to be updated in the docker commands listed above for starting the SolrCloud (apache-tomcat-$TOMCAT_VERSION).

The locations of the Solr and Tomcat distributions would also need to be updated in the apache_tomcat_setenv.sh file if they are changed in the Dockerfile.

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