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cassandra: init service (#116)
* cassandra: init service * cassandra: add cassandra/conf files * cassandra_test: change package to cassandra_4 * update readiness_probe * update cassandra_test * cassandra: add doc * cassandra_4 doesn't require python-2 --------- Co-authored-by: shivaraj-bh <sbh69840@gmail.com>
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doc/cassandra.md
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31
doc/cassandra.md
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# Cassandra
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[Cassandra] is a free and open-source, distributed, wide-column store, NoSQL database management system designed to handle large amounts of data across many commodity servers, providing high availability with no single point of failure.
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[Cassandra]: https://cassandra.apache.org/_/index.html
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## Getting Started
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```nix
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# In `perSystem.process-compose.<name>`
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{
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services.cassandra."cass1".enable = true;
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}
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```
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{#tips}
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## Tips & Tricks
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{#change-port}
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### Change the default port
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By default, the Cassandra server is started on port `9042`. To change the port, we can use the following config:
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```nix
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{
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services.cassandra."cass1" = {
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enable = true;
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nativeTransportPort = 9043;
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};
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}
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```
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@ -19,6 +19,7 @@ short-title: Services
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- [x] [[grafana]]#
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- [X] [[prometheus]]#
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- [X] [[pgadmin]]#
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- [X] [[cassandra]]#
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- [ ] ...
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[gh]: https://github.com/juspay/services-flake
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nix/cassandra.nix
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nix/cassandra.nix
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# Based on https://github.com/cachix/devenv/blob/fa9a708e240c6174f9fc4c6eefbc6a89ce01c350/src/modules/services/cassandra.nix
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{ pkgs, lib, name, config, ... }:
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let
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inherit (lib) types;
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yamlFormat = pkgs.formats.yaml { };
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in
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{
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options = {
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enable = lib.mkEnableOption name;
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package = lib.mkPackageOption pkgs "cassandra" { };
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dataDir = lib.mkOption {
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type = types.str;
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default = "./data/${name}";
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description = "The cassandra data directory";
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};
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listenAddress = lib.mkOption {
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type = types.str;
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description = "Listen address";
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default = "127.0.0.1";
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example = "127.0.0.1";
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};
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nativeTransportPort = lib.mkOption {
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type = types.port;
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description = "port for the CQL native transport to listen for clients on";
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default = 9042;
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};
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seedAddresses = lib.mkOption {
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type = types.listOf types.str;
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default = [ "127.0.0.1" ];
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description = "The addresses of hosts designated as contact points of the cluster";
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};
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clusterName = lib.mkOption {
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type = types.str;
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default = "Test Cluster";
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description = "The name of the cluster";
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};
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allowClients = lib.mkOption {
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type = types.bool;
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default = true;
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description = ''
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Enables or disables the native transport server (CQL binary protocol)
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'';
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};
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extraConfig = lib.mkOption {
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type = yamlFormat.type;
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default = { };
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example =
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{
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commitlog_sync_batch_window_in_ms = 3;
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};
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description = ''
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Extra options to be merged into `cassandra.yaml` as nix attribute set.
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'';
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};
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jvmOpts = lib.mkOption {
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type = types.listOf types.str;
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default = [ ];
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description = "Options to pass to the JVM through the JVM_OPTS environment variable";
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};
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defaultExtraConfig = lib.mkOption {
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type = yamlFormat.type;
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internal = true;
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readOnly = true;
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default = {
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start_native_transport = config.allowClients;
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listen_address = config.listenAddress;
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native_transport_port = config.nativeTransportPort;
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commitlog_sync = "batch";
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commitlog_sync_batch_window_in_ms = 2;
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cluster_name = config.clusterName;
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partitioner = "org.apache.cassandra.dht.Murmur3Partitioner";
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endpoint_snitch = "SimpleSnitch";
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data_file_directories = [ "${config.dataDir}/data" ];
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commitlog_directory = "${config.dataDir}/commitlog";
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saved_caches_directory = "${config.dataDir}/saved_caches";
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hints_directory = "${config.dataDir}/hints";
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seed_provider = [
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{
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class_name = "org.apache.cassandra.locator.SimpleSeedProvider";
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parameters = [{ seeds = lib.concatStringsSep "," config.seedAddresses; }];
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}
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];
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};
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};
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outputs.settings = lib.mkOption {
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type = types.deferredModule;
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internal = true;
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readOnly = true;
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default = {
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processes = {
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"${name}" =
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let
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cassandraConfig = pkgs.stdenv.mkDerivation {
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name = "cassandra-config";
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cassandraYaml = yamlFormat.generate "cassandra.yaml" (
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lib.recursiveUpdate config.defaultExtraConfig config.extraConfig
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);
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buildCommand = ''
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mkdir -p $out
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for d in ${config.package}/conf/*; do ln -s "$d" $out/; done
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rm -rf $out/cassandra.y*ml
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ln -s "$cassandraYaml" "$out/cassandra.yaml"
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rm -rf $out/cassandra-env.sh
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cat ${config.package}/conf/cassandra-env.sh > $out/cassandra-env.sh
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LOCAL_JVM_OPTS="${lib.concatStringsSep " " config.jvmOpts}"
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echo "JVM_OPTS=\"\$JVM_OPTS $LOCAL_JVM_OPTS\"" >> $out/cassandra-env.sh
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'';
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};
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startScript = pkgs.writeShellScriptBin "start-cassandra" ''
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set -euo pipefail
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DATA_DIR="$(readlink -m ${config.dataDir})"
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if [[ ! -d "$DATA_DIR" ]]; then
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mkdir -p "$DATA_DIR"
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fi
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CASSANDRA_CONF="${cassandraConfig}"
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export CASSANDRA_CONF
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CASSANDRA_LOG_DIR="$DATA_DIR/log/"
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mkdir -p "$CASSANDRA_LOG_DIR"
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export CASSANDRA_LOG_DIR
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CASSANDRA_HOME="${config.package}"
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export CASSANDRA_HOME
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CLASSPATH="${config.package}/lib"
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export CLASSPATH
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export LOCAL_JMX="yes"
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exec ${config.package}/bin/cassandra -f
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'';
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in
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{
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command = startScript;
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readiness_probe = {
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exec.command = ''
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echo 'show version;' | CQLSH_HOST=${config.listenAddress} CQLSH_PORT=${toString config.nativeTransportPort} ${config.package}/bin/cqlsh
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'';
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initial_delay_seconds = 2;
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period_seconds = 10;
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timeout_seconds = 4;
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success_threshold = 1;
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failure_threshold = 5;
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};
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namespace = name;
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# https://github.com/F1bonacc1/process-compose#-auto-restart-if-not-healthy
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availability.restart = "on_failure";
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};
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};
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};
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};
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};
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}
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27
nix/cassandra_test.nix
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nix/cassandra_test.nix
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{ pkgs, config, ... }: {
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services.cassandra."cass1" = {
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enable = true;
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# support for aarch64-darwin was added in cassandra-4
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# https://github.com/apache/cassandra/blob/a87055d56a33a9b17606f14535f48eb461965b82/CHANGES.txt#L192
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package = pkgs.cassandra_4;
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};
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settings.processes.test =
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let
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cfg = config.services.cassandra."cass1";
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in
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{
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command = pkgs.writeShellApplication {
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runtimeInputs = [ cfg.package ];
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text = ''
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echo "show version;" | cqlsh
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echo "create keyspace test with replication = {'class': 'SimpleStrategy', 'replication_factor': 1};" | cqlsh
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echo "CREATE TABLE test.test_table(id int PRIMARY KEY, name text);" | cqlsh
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echo "insert into test.test_table (id, name) VALUES (1, 'hello');" | cqlsh
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echo "select * from test.test_table;" | cqlsh | grep hello
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'';
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name = "cassandra-test";
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};
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depends_on."cass1".condition = "process_healthy";
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};
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}
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./grafana.nix
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./prometheus.nix
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./pgadmin.nix
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./cassandra.nix
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];
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}
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"${inputs.services-flake}/nix/grafana_test.nix"
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"${inputs.services-flake}/nix/prometheus_test.nix"
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"${inputs.services-flake}/nix/pgadmin_test.nix"
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"${inputs.services-flake}/nix/cassandra_test.nix"
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]);
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};
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};
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