How to change Java locations for NetOps Kafka

Products

• Network Observability

Issue/Introduction

There may be a time or need to update or change the location of the JRE being used for Kafka.

This could be due to auto update, removal or any other reason.

Environment

Non-HTTPS setups currently.

Resolution

1. Update the service files:

/etc/systemd/system/netops-kafka.service -

[Unit]
Description=NetOps Kafka
Requires=netops-kafka-zookeeper.service
After=netops-kafka-zookeeper.service

[Service]
Type=simple
#Environment="JAVA_HOME=/usr/lib/jvm/java-17-openjdk-17.0.18.0.8-1.el9.x86_64"

Environment="JAVA_HOME=/home/user/jdk17/jdk-17.0.18+8-jre"
Environment="KAFKA_HEAP_OPTS=-Xmx1G -Xms1G"
User=root
Group=root
ExecStartPre=/opt/CA/netops-kafka/scripts/checkZookeeper.sh hostname 2181
ExecStart=/opt/CA/netops-kafka/kafka/bin/kafka-server-start.sh /opt/CA/netops-kafka/kafka/config/server.properties
ExecStop=/opt/CA/netops-kafka/kafka/bin/kafka-server-stop.sh

[Install]
WantedBy=multi-user.target

Update the "Envrionment="JAVA_HOME=" variable.  The old can be commented out, as the above indicates.

/etc/systemd/system/netops-kafka-zookeeper.service - 

[Unit]
Description=NetOps Kafka Zookeeper
After=syslog.target network.target

[Service]
Type=simple
#Environment="JAVA_HOME=/usr/lib/jvm/java-17-openjdk-17.0.18.0.8-1.el9.x86_64"
Environment="JAVA_HOME=/home/user/jdk17/jdk-17.0.18+8-jre"
Environment="KAFKA_HEAP_OPTS=-Xmx512M -Xms512M"
User=root
Group=root
ExecStart=/opt/CA/netops-kafka/kafka/bin/zookeeper-server-start.sh /opt/CA/netops-kafka/kafka/config/zookeeper.properties
ExecStop=/opt/CA/netops-kafka/kafka/bin/zookeeper-server-stop.sh

[Install]
WantedBy=multi-user.target

/opt/CA/netops-kafka/config/answer.properties - 

installationDirectory=/opt/CA/netops-kafka
#javaHome=/usr/lib/jvm/java-17-openjdk-17.0.18.0.8-1.el9.x86_64
javaHome=/home/user/jdk17/jdk-17.0.18+8-jre
user=root
userGroup=root
partitions=10
logRetention=1
zookeeperClientPort=2181
zookeeperMaxMemory=512M
zookeeperData=/opt/CA/netops-kafka/zookeeper-snapshots
zookeeperLogs=/opt/CA/netops-kafka/zookeeper-logs
configureService=Y
configCluster=n
zookeeperHost=hostname
dataDirectory=/opt/CA/netops-kafka/kafka-data-logs
kafkaPort=9092
maxMemory=1G
brokerBindHostAddress=hostname
brokerClientHostAddress=hostname
jmxMonitoringEnabled=n
jmxAuthenticationEnabled=N
jmxUser=kafkaControl
jmxPassword=changeit
jmxPort=10167
jmxRMIPort=10168
configureSSL=n

2. Reload the daemon via:

systemctl daemon-reload

3. Restart the services:

systemctl stop netops-kafka-zookeeper

systemctl stop netops-kafka

Wait 15 seconds, then:

systemctl start netops-kafka

The zookeeper service will start with the Kafka service.