The Cassandra Launcher automates launching and stopping of Cassandra nodes. It watches a repository (HTTP directory) for changes of
the two files default.conf and hackation.jar. If the files were changed, the Cassandra node is shutdown and relaunched with new fetched
configuration and JAR. If one of the files is not available in the repository, the node is shutdown and waiting for a valid launch configuration.
The launcher tries to get a valid configuration every 2 seconds (default) until it is closed.
Ubuntu
sudo apt-get install openjdk-11-jre
Create an empty working directory first like mkdir -p ~/cassandra or mkdir -p /opt/cassandra.
Replace <url> with the url of the repository containing the launch configuration, and the JAR.
rm -f cassandra-launcher-1.0.1-all.jar \
&& wget https://github.com/fpieper/cassandra-launcher/releases/download/1.0.1/cassandra-launcher-1.0.1-all.jar \
&& java -jar cassandra-launcher-1.0.1-all.jar --repository <url> --console
git clone https://github.com/fpieper/cassandra-launcher.git
cd cassandra-launcher
sh gradlew build
java -jar build/libs/cassandra-launcher-1.0.1-all.jar --repository <url> --console
java -jar cassandra-launcher.jar --repository <url> --console
This is only required for adding/removing a Cassandra node configuration/version to the repository.
Every HTTP directory is a valid repository as long as the HTTP response contains the ETag or entity tag.
The launcher considers a repository as valid if default.conf and hackation.jar are found in that directory.