Enabling SSL/TLS

If you configure the Syslog destination to use the TCP protocol, you can enable the destination to use SSL/TLS to connect to the Syslog server.

In the Syslog Connection tab, select the Enable SSL property.
If the Syslog server certificate is signed by a private CA or not trusted by the default Java truststore, create a custom truststore file or modify a copy of the default Java truststore file to add the CA to the file. Then configure Data Collector to use the modified truststore file.

By default, Data Collector uses the Java truststore file located in $JAVA_HOME/jre/lib/security/cacerts. If your certificate is signed by a CA that is included in the default Java truststore file, you do not need to create a truststore file and can skip this step.

In these steps, we show how to modify the default truststore file to add an additional CA to the list of trusted CAs. If you prefer to create a custom truststore file, see the keytool documentation.
Note: If Data Collector is already configured to use a custom truststore file to enable HTTPS or for secure connections to an LDAP server, then simply add this additional CA to the same modified truststore file.
Note: If Data Collector is already configured to use a custom truststore file to enable HTTPS or for secure connections to an LDAP server, then simply add this additional CA to the same modified truststore file.
1. Use the following command to set the JAVA_HOME environment variable:
```
export JAVA_HOME=<Java home directory>
```
2. Use the following command to set the SDC_CONF environment variable:
```
export SDC_CONF=<Data Collector configuration directory>
```
  For example, for an RPM installation use:
```
export SDC_CONF=/etc/sdc
```
  For example:
```
export SDC_CONF=/streamsets-datacollector-4.1.0/etc
```
3. Use the following command to copy the default Java truststore file to the Data Collector configuration directory:
```
cp "${JAVA_HOME}/jre/lib/security/cacerts" "${SDC_CONF}/truststore.jks"
```
4. Use the following keytool command to import the CA certificate into the truststore file:
```
keytool -import -file <Syslog certificate> -trustcacerts -noprompt -alias <Syslog alias> -storepass <password> -keystore "${SDC_CONF}/truststore.jks"
```
  For example:
```
keytool -import -file  mySyslogServer.pem -trustcacerts -noprompt -alias MySyslogServer -storepass changeit -keystore "${SDC_CONF}/truststore.jks"
```
5. Define the following options in the SDC_JAVA_OPTS environment variable:In Control Hub, edit the deployment. In the Configure Engine section, click Advanced Configuration. Then, click Java Configuration. Define the following options in the Java Options property:
  - javax.net.ssl.trustStore - Path to the truststore file on the Data Collector machine.
  - javax.net.ssl.trustStorePassword - Truststore password.
  Modify environment variables Modify environment variables using the method required by your installation type.
  For example, define the options as follows:
```
export SDC_JAVA_OPTS="${SDC_JAVA_OPTS} -Djavax.net.ssl.trustStore=/etc/sdc/truststore.jks -Djavax.net.ssl.trustStorePassword=mypassword -Xmx1024m -Xms1024m -server -XX:-OmitStackTraceInFastThrow"
```
```
-Djavax.net.ssl.trustStore=/streamsets-datacollector-4.1.0/etc/truststore.jks -Djavax.net.ssl.trustStorePassword=mypassword
```
  Or to avoid saving the password in the export command, save the password in a text file and then define the truststore password option as follows: -Djavax.net.ssl.trustStorePassword=$(cat passwordfile.txt)
  
  Then ensure that the password file is readable only by the user executing the export command.
6. Restart Data Collector to enable the changes.Save the changes to the deployment and restart all engine instances.