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It seems these should go in the ${configDir}/jvm.options"} (/var/lib/elasticsearch/config/jvm.options ?) looking at the package at https://github.com/NixOS/nixpkgs/blob/master/nixos/modules/services/search/elasticsearch.nix

Possibly I could use the ES_JAVA_OPTS environment variable?

Using services.elasticsearch.extraJavaOptions does not work as it seems something is passing -Xms1g -Xmx1g by default:

Output from ps aux

elastic+ 21271 30.8 47.5 4456956 950968 ? Ssl 01:03 3:41 /nix/store/9c5a9fq2vd6qah77nmg87sjq5wbss1kj-openjdk-8u212-ga-jre/bin/java -Xms1g -Xmx1g -XX:+UseConcMarkSweepGC -XX:CMSInitiatingOccupancyFraction=75 -XX:+UseCMSInitiatingOccupancyOnly -XX:+AlwaysPreTouch -Xss1m -Djava.awt.headless=true -Dfile.encoding=UTF-8 -Djna.nosys=true -XX:-OmitStackTraceInFastThrow -Dio.netty.noUnsafe=true -Dio.netty.noKeySetOptimization=true -Dio.netty.recycler.maxCapacityPerThread=0 -Dlog4j.shutdownHookEnabled=false -Dlog4j2.disable.jmx=true -Djava.io.tmpdir=/tmp/elasticsearch.uQNUAfPs -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=data -XX:ErrorFile=logs/hs_err_pid%p.log -XX:+PrintGCDetails -XX:+PrintGCDateStamps -XX:+PrintTenuringDistribution -XX:+PrintGCApplicationStoppedTime -Xloggc:logs/gc.log -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=32 -XX:GCLogFileSize=64m -Xms512m -Xmx512m -Des.path.home=/var/lib/elasticsearch -Des.path.conf=/var/lib/elasticsearch/config -Des.distribution.flavor=default -Des.distribution.type=tar -cp /var/lib/elasticsearch/lib/* org.elasticsearch.bootstrap.Elasticsearch

  • Have you seen this, elastic.co/guide/en/elasticsearch/reference/current/… ? It is the first reference found by Googling elastisearch heap size. It contains the full answer to your question, including using an environment variable. – MariusMatutiae Feb 18 '19 at 8:49
  • I have - the difficulty is knowing how to integrate this ENVS / config with Nixos. – Chris Stryczynski Feb 18 '19 at 8:52
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    The jvm.options file is copied from the Nix store to /var/lib/elasticsearch/config/ every time ElasticSearch is started. Hence changes to the file would get overwritten. Assuming ES_JAVA_OPTS takes precedence over jvm.options, you can do something like services.elasticsearch.extraJavaOptions = [ "-Xms2g" "-Xmx2g" ] – Emmanuel Rosa Feb 18 '19 at 13:50
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Perhaps a bit overkill but I'm not too sure how to override a Nixos service's parameters.

Essentially the default options are in .../jvm.options so I copied the elasticsearch.nix from Github and modified the following:

        ${optionalString es6 "sed -i '/-Xms1g/d' ${configDir}/jvm.options"}
        ${optionalString es6 "sed -i '/-Xmx1g/d' ${configDir}/jvm.options"}

Along with changing the name of the service (otherwise I'd assume it would conflict). I then just included this nix expression into my config and it seems to be working with the appropriate values set in ES_JAVA_OPTS.

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