Setting system properties during startup

jvm-server.options

There are three files that control Java Virtual Machine options:

jvm-server.options: options independent of any particular JVM
jvm8-server.options: options particular to JVM 8
jvm11-server.options: options particular to JVM 11

The location of the jvm [8 | 11] -server.options file depends on the type of installation:

Package installations	/etc/dse/cassandra/jvm [8 \| 11] -server.options
Tarball installations	`installation_location`/resources/cassandra/conf/jvm [8 \| 11] -server.options

cassandra-env.sh

The location of the cassandra-env.sh file depends on the type of installation:

Package installations	/etc/dse/cassandra/cassandra-env.sh
Tarball installations	`installation_location`/resources/cassandra/conf/cassandra-env.sh

Use the system property (-D) switch to modify the DataStax Enterprise (DSE) settings during start up. To automatically pass the settings each time DSE starts, uncomment or add the switch to the jvm-server.options file.

Important: Depending upon the JVM you are using, switches may be located in either jvm8-server.options or jvm11-server.options.

Important: Metrics collection is enabled by default. To disable metrics collection, set -Dinsights.default_mode to disabled.

Synopsis

Change the start up parameters using the following syntax:

Command line:
```
dse cassandra -Dparameter_name=value
```
jvm-server.options, jvm8-server.options, or jvm11-server.options file:
```
-Dparameter_name=value
```

file:

JVM_OPTS="$JVM_OPTS -Dparameter_name=value"

Warning: Only pass the parameter to the start-up operation once. If the same switch is passed to the start operation multiple times, for example from both the jvm-server.options file and on the command line, DSE may fail to start or may use the wrong parameter.

Startup examples

Starting a node without joining the ring:

Command line:

dse cassandra -Dcassandra.join_ring=false

jvm.options:
```
-Dcassandra.join_ring=false
```

Replacing a dead node:

Command line:

dse cassandra -Dcassandra.replace_address=10.91.176.160

jvm.options:

-Dcassandra.replace_address=10.91.176.160

Disabling DSE metrics collection:

Command line:

dse cassandra -Dinsights.default_mode=disabled

jvm-server.options:
```
-Dinsights.default_mode=disabled
```

Changing LDAP authentication retry interval from its default of 10 ms:

Command line:
```
dse -Ddse.ldap.retry_interval.ms=20
```
jvm.options:
```
-Ddse.ldap.retry_interval.ms=20
```