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nixos/cassandra: Add nixos conf for Java env

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This commit is contained in:
Daniel Schaefer 2019-04-07 06:30:26 +02:00
parent 746b82bd4a
commit f0031432ce
1 changed files with 86 additions and 7 deletions
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93
nixos/modules/services/databases/cassandra.nix
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@ -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 =