注意：先停止kafka，再操作。

1.新增kafka.service

vi /etc/systemd/system/kafka.service

# kafka.service内容

[Unit]
Description=Apache Kafka Service
After=network.target

[Service]
Type=forking
ExecStart=/opt/app/middles/kafka_2.12-2.4.1/bin/kafka-server-start.sh -daemon /opt/app/middles/kafka_2.12-2.4.1/config/server.properties
ExecStop=/opt/app/middles/kafka_2.12-2.4.1/bin/kafka-server-stop.sh
User=root
Group=root
RestartSec=5
Environment="JAVA_HOME=/opt/app/middles/jdk8"

[Install]
WantedBy=multi-user.target

2.加载并设置自动启动

sudo systemctl daemon-reload
sudo systemctl enable kafka.service
sudo systemctl start kafka.service
sudo systemctl status kafka.service
sudo systemctl stop kafka.service