Configuring Livy

Perform the following steps to configure Livy:

Login as root, or use root privilege to create users Livy and Zeppelin:
```
useradd livy -g hadoop
useradd zeppelin -g hadoop
```
Create a log directory for Livy:
```
mkdir /var/log/livy
```
Change owner of /var/log/livy to livy:hadoop.
```
chown livy:hadoop /var/log/livy
```
/etc/livy/livy.conf contains information regarding server configuration.
Create file /etc/livy/livy.conf and add the following to the file:
```
livy.environment production
livy.impersonation.enabled true
livy.server.csrf_protection.enabled true
livy.server.port 8998
livy.server.session.timeout 3600000
```
/etc/livy/spark-blacklist.conf defines a list of properties that users are not allowed to override when a Spark session is started.
Create an empty file called /etc/livy/spark-blacklist.conf.

Create file /etc/livy/livy-env.sh to define the environmental variables. Add the following to the file:

export SPARK_HOME=/usr/hdp/current/spark-client
export LIVY_LOG_DIR=/var/log/livy
export LIVY_PID_DIR=/var/run/livy
export LIVY_SERVER_JAVA_OPTS="-Xmx2g"

If you are not using Kerberos, skip these steps.

If you are using Kerberos, create Livy and Zeppelin principals and keytabs:

kadmin.local -q "addprinc -randkey livy@EXAMPLE.COM"
kadmin.local -q "xst -k /etc/security/keytabs/livy.headless.keytab livy@EXAMPLE.COM"
kadmin.local -q "addprinc -randkey zeppelin@EXAMPLE.COM"
kadmin.local -q "xst -k /etc/security/keytabs/zeppelin.headless.keytab zeppelin@EXAMPLE.COM"

If you are using Kerberos, move the Livy and Zeppelin key tables to the node on which Livy and Zeppelin will run.
```
chown livy:hadoop /etc/security/keytabs/livy.headless.keytab
chown zeppelin:hadoop /etc/security/keytabs/zeppelin.headless.keytab
```

Ensure that the Livy user can read the contents of the /etc/livy/conf directory.

​Configuring Livy

Configuring Livy