nixpkgs/nixos/modules/services/databases/cassandra.nix
2017-04-11 18:18:53 +02:00

449 lines
14 KiB
Nix

{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.cassandra;
cassandraPackage = cfg.package.override {
jre = cfg.jre;
};
cassandraUser = {
name = cfg.user;
home = "/var/lib/cassandra";
description = "Cassandra role user";
};
cassandraRackDcProperties = ''
dc=${cfg.dc}
rack=${cfg.rack}
'';
cassandraConf = ''
cluster_name: ${cfg.clusterName}
num_tokens: 256
auto_bootstrap: ${boolToString cfg.autoBootstrap}
hinted_handoff_enabled: ${boolToString cfg.hintedHandOff}
hinted_handoff_throttle_in_kb: ${builtins.toString cfg.hintedHandOffThrottle}
max_hints_delivery_threads: 2
max_hint_window_in_ms: 10800000 # 3 hours
authenticator: ${cfg.authenticator}
authorizer: ${cfg.authorizer}
permissions_validity_in_ms: 2000
partitioner: org.apache.cassandra.dht.Murmur3Partitioner
data_file_directories:
${builtins.concatStringsSep "\n" (map (v: " - "+v) cfg.dataDirs)}
commitlog_directory: ${cfg.commitLogDirectory}
disk_failure_policy: stop
key_cache_size_in_mb:
key_cache_save_period: 14400
row_cache_size_in_mb: 0
row_cache_save_period: 0
saved_caches_directory: ${cfg.savedCachesDirectory}
commitlog_sync: ${cfg.commitLogSync}
commitlog_sync_period_in_ms: ${builtins.toString cfg.commitLogSyncPeriod}
commitlog_segment_size_in_mb: 32
seed_provider:
- class_name: org.apache.cassandra.locator.SimpleSeedProvider
parameters:
- seeds: "${builtins.concatStringsSep "," cfg.seeds}"
concurrent_reads: ${builtins.toString cfg.concurrentReads}
concurrent_writes: ${builtins.toString cfg.concurrentWrites}
memtable_flush_queue_size: 4
trickle_fsync: false
trickle_fsync_interval_in_kb: 10240
storage_port: 7000
ssl_storage_port: 7001
listen_address: ${cfg.listenAddress}
start_native_transport: true
native_transport_port: 9042
start_rpc: true
rpc_address: ${cfg.rpcAddress}
rpc_port: 9160
rpc_keepalive: true
rpc_server_type: sync
thrift_framed_transport_size_in_mb: 15
incremental_backups: ${boolToString cfg.incrementalBackups}
snapshot_before_compaction: false
auto_snapshot: true
column_index_size_in_kb: 64
in_memory_compaction_limit_in_mb: 64
multithreaded_compaction: false
compaction_throughput_mb_per_sec: 16
compaction_preheat_key_cache: true
read_request_timeout_in_ms: 10000
range_request_timeout_in_ms: 10000
write_request_timeout_in_ms: 10000
cas_contention_timeout_in_ms: 1000
truncate_request_timeout_in_ms: 60000
request_timeout_in_ms: 10000
cross_node_timeout: false
endpoint_snitch: ${cfg.snitch}
dynamic_snitch_update_interval_in_ms: 100
dynamic_snitch_reset_interval_in_ms: 600000
dynamic_snitch_badness_threshold: 0.1
request_scheduler: org.apache.cassandra.scheduler.NoScheduler
server_encryption_options:
internode_encryption: ${cfg.internodeEncryption}
keystore: ${cfg.keyStorePath}
keystore_password: ${cfg.keyStorePassword}
truststore: ${cfg.trustStorePath}
truststore_password: ${cfg.trustStorePassword}
client_encryption_options:
enabled: ${boolToString cfg.clientEncryption}
keystore: ${cfg.keyStorePath}
keystore_password: ${cfg.keyStorePassword}
internode_compression: all
inter_dc_tcp_nodelay: false
preheat_kernel_page_cache: false
streaming_socket_timeout_in_ms: ${toString cfg.streamingSocketTimoutInMS}
'';
cassandraLog = ''
log4j.rootLogger=${cfg.logLevel},stdout
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] %d{HH:mm:ss,SSS} %m%n
'';
cassandraConfFile = pkgs.writeText "cassandra.yaml" cassandraConf;
cassandraLogFile = pkgs.writeText "log4j-server.properties" cassandraLog;
cassandraRackFile = pkgs.writeText "cassandra-rackdc.properties" cassandraRackDcProperties;
cassandraEnvironment = {
CASSANDRA_HOME = cassandraPackage;
JAVA_HOME = cfg.jre;
CASSANDRA_CONF = "/etc/cassandra";
};
in {
###### interface
options.services.cassandra = {
enable = mkOption {
description = "Whether to enable cassandra.";
default = false;
type = types.bool;
};
package = mkOption {
description = "Cassandra package to use.";
default = pkgs.cassandra;
defaultText = "pkgs.cassandra";
type = types.package;
};
jre = mkOption {
description = "JRE package to run cassandra service.";
default = pkgs.jre;
defaultText = "pkgs.jre";
type = types.package;
};
user = mkOption {
description = "User that runs cassandra service.";
default = "cassandra";
type = types.string;
};
group = mkOption {
description = "Group that runs cassandra service.";
default = "cassandra";
type = types.string;
};
envFile = mkOption {
description = "path to cassandra-env.sh";
default = "${cassandraPackage}/conf/cassandra-env.sh";
defaultText = "\${cassandraPackage}/conf/cassandra-env.sh";
type = types.path;
};
clusterName = mkOption {
description = "set cluster name";
default = "cassandra";
example = "prod-cluster0";
type = types.string;
};
commitLogDirectory = mkOption {
description = "directory for commit logs";
default = "/var/lib/cassandra/commit_log";
type = types.string;
};
savedCachesDirectory = mkOption {
description = "directory for saved caches";
default = "/var/lib/cassandra/saved_caches";
type = types.string;
};
hintedHandOff = mkOption {
description = "enable hinted handoff";
default = true;
type = types.bool;
};
hintedHandOffThrottle = mkOption {
description = "hinted hand off throttle rate in kb";
default = 1024;
type = types.int;
};
commitLogSync = mkOption {
description = "commitlog sync method";
default = "periodic";
type = types.str;
example = "batch";
};
commitLogSyncPeriod = mkOption {
description = "commitlog sync period in ms ";
default = 10000;
type = types.int;
};
envScript = mkOption {
default = "${cassandraPackage}/conf/cassandra-env.sh";
defaultText = "\${cassandraPackage}/conf/cassandra-env.sh";
type = types.path;
description = "Supply your own cassandra-env.sh rather than using the default";
};
extraParams = mkOption {
description = "add additional lines to cassandra-env.sh";
default = [];
example = [''JVM_OPTS="$JVM_OPTS -Dcassandra.available_processors=1"''];
type = types.listOf types.str;
};
dataDirs = mkOption {
type = types.listOf types.path;
default = [ "/var/lib/cassandra/data" ];
description = "Data directories for cassandra";
};
logLevel = mkOption {
type = types.str;
default = "INFO";
description = "default logging level for log4j";
};
internodeEncryption = mkOption {
description = "enable internode encryption";
default = "none";
example = "all";
type = types.str;
};
clientEncryption = mkOption {
description = "enable client encryption";
default = false;
type = types.bool;
};
trustStorePath = mkOption {
description = "path to truststore";
default = ".conf/truststore";
type = types.str;
};
keyStorePath = mkOption {
description = "path to keystore";
default = ".conf/keystore";
type = types.str;
};
keyStorePassword = mkOption {
description = "password to keystore";
default = "cassandra";
type = types.str;
};
trustStorePassword = mkOption {
description = "password to truststore";
default = "cassandra";
type = types.str;
};
seeds = mkOption {
description = "password to truststore";
default = [ "127.0.0.1" ];
type = types.listOf types.str;
};
concurrentWrites = mkOption {
description = "number of concurrent writes allowed";
default = 32;
type = types.int;
};
concurrentReads = mkOption {
description = "number of concurrent reads allowed";
default = 32;
type = types.int;
};
listenAddress = mkOption {
description = "listen address";
default = "localhost";
type = types.str;
};
rpcAddress = mkOption {
description = "rpc listener address";
default = "localhost";
type = types.str;
};
incrementalBackups = mkOption {
description = "enable incremental backups";
default = false;
type = types.bool;
};
snitch = mkOption {
description = "snitch to use for topology discovery";
default = "GossipingPropertyFileSnitch";
example = "Ec2Snitch";
type = types.str;
};
dc = mkOption {
description = "datacenter for use in topology configuration";
default = "DC1";
example = "DC1";
type = types.str;
};
rack = mkOption {
description = "rack for use in topology configuration";
default = "RAC1";
example = "RAC1";
type = types.str;
};
authorizer = mkOption {
description = "
Authorization backend, implementing IAuthorizer; used to limit access/provide permissions
";
default = "AllowAllAuthorizer";
example = "CassandraAuthorizer";
type = types.str;
};
authenticator = mkOption {
description = "
Authentication backend, implementing IAuthenticator; used to identify users
";
default = "AllowAllAuthenticator";
example = "PasswordAuthenticator";
type = types.str;
};
autoBootstrap = mkOption {
description = "It makes new (non-seed) nodes automatically migrate the right data to themselves.";
default = true;
type = types.bool;
};
streamingSocketTimoutInMS = mkOption {
description = "Enable or disable socket timeout for streaming operations";
default = 3600000; #CASSANDRA-8611
example = 120;
type = types.int;
};
repairStartAt = mkOption {
default = "Sun";
type = types.string;
description = ''
Defines realtime (i.e. wallclock) timers with calendar event
expressions. For more details re: systemd OnCalendar at
https://www.freedesktop.org/software/systemd/man/systemd.time.html#Displaying%20Time%20Spans
'';
example = ["weekly" "daily" "08:05:40" "mon,fri *-1/2-1,3 *:30:45"];
};
repairRandomizedDelayInSec = mkOption {
default = 0;
type = types.int;
description = ''Delay the timer by a randomly selected, evenly distributed
amount of time between 0 and the specified time value. re: systemd timer
RandomizedDelaySec for more details
'';
};
repairPostStop = mkOption {
default = null;
type = types.nullOr types.string;
description = ''
Run a script when repair is over. One can use it to send statsd events, email, etc.
'';
};
repairPostStart = mkOption {
default = null;
type = types.nullOr types.string;
description = ''
Run a script when repair starts. One can use it to send statsd events, email, etc.
It has same semantics as systemd ExecStopPost; So, if it fails, unit is consisdered
failed.
'';
};
};
###### implementation
config = mkIf cfg.enable {
environment.etc."cassandra/cassandra-rackdc.properties" = {
source = cassandraRackFile;
};
environment.etc."cassandra/cassandra.yaml" = {
source = cassandraConfFile;
};
environment.etc."cassandra/log4j-server.properties" = {
source = cassandraLogFile;
};
environment.etc."cassandra/cassandra-env.sh" = {
text = ''
${builtins.readFile cfg.envFile}
${concatStringsSep "\n" cfg.extraParams}
'';
};
systemd.services.cassandra = {
description = "Cassandra Daemon";
wantedBy = [ "multi-user.target" ];
after = [ "network.target" ];
environment = cassandraEnvironment;
restartTriggers = [ cassandraConfFile cassandraLogFile cassandraRackFile ];
serviceConfig = {
User = cfg.user;
PermissionsStartOnly = true;
LimitAS = "infinity";
LimitNOFILE = "100000";
LimitNPROC = "32768";
LimitMEMLOCK = "infinity";
};
script = ''
${cassandraPackage}/bin/cassandra -f
'';
path = [
cfg.jre
cassandraPackage
pkgs.coreutils
];
preStart = ''
mkdir -m 0700 -p /etc/cassandra/triggers
mkdir -m 0700 -p /var/lib/cassandra /var/log/cassandra
chown ${cfg.user} /var/lib/cassandra /var/log/cassandra /etc/cassandra/triggers
'';
postStart = ''
sleep 2
while ! nodetool status >/dev/null 2>&1; do
sleep 2
done
nodetool status
'';
};
environment.systemPackages = [ cassandraPackage ];
networking.firewall.allowedTCPPorts = [
7000
7001
9042
9160
];
users.extraUsers.cassandra =
if config.ids.uids ? "cassandra"
then { uid = config.ids.uids.cassandra; } // cassandraUser
else cassandraUser ;
boot.kernel.sysctl."vm.swappiness" = pkgs.lib.mkOptionDefault 0;
systemd.timers."cassandra-repair" = {
timerConfig = {
OnCalendar = "${toString cfg.repairStartAt}";
RandomizedDelaySec = cfg.repairRandomizedDelayInSec;
};
};
systemd.services."cassandra-repair" = {
description = "Cassandra repair daemon";
environment = cassandraEnvironment;
script = "${cassandraPackage}/bin/nodetool repair -pr";
postStop = mkIf (cfg.repairPostStop != null) cfg.repairPostStop;
postStart = mkIf (cfg.repairPostStart != null) cfg.repairPostStart;
serviceConfig = {
User = cfg.user;
};
};
};
}