diff options
author | Daniel Schaefer <git@danielschaefer.me> | 2019-04-07 06:30:26 +0200 |
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committer | Daniel Schaefer <git@danielschaefer.me> | 2019-06-13 04:36:40 +0200 |
commit | f0031432ce0c350f8e44072471f6838ee24a21a8 (patch) | |
tree | 197cf3afcaa6f99985d37e5943281925967a937b /nixos/modules | |
parent | 746b82bd4a6226f40b89d97856576fcaa117cb5c (diff) |
nixos/cassandra: Add nixos conf for Java env
Diffstat (limited to 'nixos/modules')
-rw-r--r-- | nixos/modules/services/databases/cassandra.nix | 93 |
1 files changed, 86 insertions, 7 deletions
diff --git a/nixos/modules/services/databases/cassandra.nix b/nixos/modules/services/databases/cassandra.nix index ee6c092f0a45..f51bf824a5e2 100644 --- a/nixos/modules/services/databases/cassandra.nix +++ b/nixos/modules/services/databases/cassandra.nix @@ -40,8 +40,11 @@ let mkdir -p "$out" echo "$cassandraYaml" > "$out/cassandra.yaml" - ln -s "$cassandraEnvPkg" "$out/cassandra-env.sh" ln -s "$cassandraLogbackConfig" "$out/logback.xml" + + cp "$cassandraEnvPkg" "$out/cassandra-env.sh" + # Delete default JMX Port, otherwise we can't set it using env variable + sed -i '/JMX_PORT="7199"/d' "$out/cassandra-env.sh" ''; }; in { @@ -237,20 +240,91 @@ in { Options passed through to the incremental repair command. ''; }; + maxHeapSize = mkOption { + type = types.nullOr types.string; + default = null; + example = "4G"; + description = '' + Must be left blank or set together with heapNewSize. + If left blank a sensible value for the available amount of RAM and CPU + cores is calculated. + + Override to set the amount of memory to allocate to the JVM at + start-up. For production use you may wish to adjust this for your + environment. MAX_HEAP_SIZE is the total amount of memory dedicated + to the Java heap. HEAP_NEWSIZE refers to the size of the young + generation. + + The main trade-off for the young generation is that the larger it + is, the longer GC pause times will be. The shorter it is, the more + expensive GC will be (usually). + ''; + }; + heapNewSize = mkOption { + type = types.nullOr types.string; + default = null; + example = "800M"; + description = '' + Must be left blank or set together with heapNewSize. + If left blank a sensible value for the available amount of RAM and CPU + cores is calculated. + + Override to set the amount of memory to allocate to the JVM at + start-up. For production use you may wish to adjust this for your + environment. HEAP_NEWSIZE refers to the size of the young + generation. + + The main trade-off for the young generation is that the larger it + is, the longer GC pause times will be. The shorter it is, the more + expensive GC will be (usually). + + The example HEAP_NEWSIZE assumes a modern 8-core+ machine for decent pause + times. If in doubt, and if you do not particularly want to tweak, go with + 100 MB per physical CPU core. + ''; + }; + mallocArenaMax = mkOption { + type = types.nullOr types.int; + default = null; + example = 4; + description = '' + Set this to control the amount of arenas per-thread in glibc. + ''; + }; + remoteJmx = mkOption { + type = types.bool; + default = false; + description = '' + Cassandra ships with JMX accessible *only* from localhost. + To enable remote JMX connections set to true. + + Be sure to also enable authentication and/or TLS. + See: https://wiki.apache.org/cassandra/JmxSecurity + ''; + }; + jmxPort = mkOption { + type = types.int; + default = 7199; + description = '' + Specifies the default port over which Cassandra will be available for + JMX connections. + For security reasons, you should not expose this port to the internet. + Firewall it if needed. + ''; + }; }; config = mkIf cfg.enable { assertions = - [ { assertion = - (cfg.listenAddress == null || cfg.listenInterface == null) - && !(cfg.listenAddress == null && cfg.listenInterface == null); + [ { assertion = (cfg.listenAddress == null) != (cfg.listenInterface == null); message = "You have to set either listenAddress or listenInterface"; } - { assertion = - (cfg.rpcAddress == null || cfg.rpcInterface == null) - && !(cfg.rpcAddress == null && cfg.rpcInterface == null); + { assertion = (cfg.rpcAddress == null) != (cfg.rpcInterface == null); message = "You have to set either rpcAddress or rpcInterface"; } + { assertion = (cfg.maxHeapSize == null) == (cfg.heapNewSize == null); + message = "If you set either of maxHeapSize or heapNewSize you have to set both"; + } ]; users = mkIf (cfg.user == defaultUser) { extraUsers."${defaultUser}" = @@ -269,6 +343,11 @@ in { environment = { CASSANDRA_CONF = "${cassandraEtc}"; JVM_OPTS = builtins.concatStringsSep " " cfg.jvmOpts; + MAX_HEAP_SIZE = toString cfg.maxHeapSize; + HEAP_NEWSIZE = toString cfg.heapNewSize; + MALLOC_ARENA_MAX = toString cfg.mallocArenaMax; + LOCAL_JMX = if cfg.remoteJmx then "no" else "yes"; + JMX_PORT = toString cfg.jmxPort; }; wantedBy = [ "multi-user.target" ]; serviceConfig = |