CenotOS环境Nacos安装，设置开机自启动

1、下载

nacos下载地址：https://github.com/alibaba/nacos/releases

2、安装

进入nacos所在目录，执行如下命令

tar -zxvf nacos-server-2.0.3.tar.gz -C /usr/local/

3、单机启动

修改/usr/local/nacos/bin目录下startup.sh启动文件设置单机启动，修改export MODE="cluster"值为standalone

export MODE="standalone"

4、启动测试

进入/usr/local/nacos/bin目录下，执行启动命令

./startup.sh

启动失败，查看/usr/local/nacos/logs下start.out日志文件，报错如下：

/usr/local/java/jdk-11.0.10/bin/java   -Xms512m -Xmx512m -Xmn256m -Dnacos.standalone=true -Dnacos.member.list= -Xlog:gc*:file=/usr/local/nacos/logs/nacos_gc.log:time,tags:filecount=10,filesize=102400 -Dloader.path=/usr/local/nacos/plugins/health,/usr/local/nacos/plugins/cmdb -Dnacos.home=/usr/local/nacos -jar /usr/local/nacos/target/nacos-server.jar  --spring.config.additional-location=file:/usr/local/nacos/conf/ --logging.config=/usr/local/nacos/conf/nacos-logback.xml --server.max-http-header-size=524288
Error: Could not find or load main class 
Caused by: java.lang.ClassNotFoundException: 

5、解决方案

进入/usr/local/nacos/bin/目录，修改启动文件startup.sh，修改内容如下：

x JAVA_OPT_EXT_FIX="-Djava.ext.dirs=${JAVA_HOME}/jre/lib/ext:${JAVA_HOME}/lib/ext"
√ JAVA_OPT="${JAVA_OPT} -Djava.ext.dirs=${JAVA_HOME}/jre/lib/ext:${JAVA_HOME}/lib/ext"

x echo "$JAVA $JAVA_OPT_EXT_FIX ${JAVA_OPT}"
√ echo "$JAVA ${JAVA_OPT}"

x echo "$JAVA $JAVA_OPT_EXT_FIX ${JAVA_OPT}" > ${BASE_DIR}/logs/start.out 2>&1 &
x nohup "$JAVA" "$JAVA_OPT_EXT_FIX" ${JAVA_OPT} nacos.nacos >> ${BASE_DIR}/logs/start.out 2>&1 &
√ echo "$JAVA ${JAVA_OPT}" > ${BASE_DIR}/logs/start.out 2>&1 &
√ nohup $JAVA ${JAVA_OPT} nacos.nacos >> ${BASE_DIR}/logs/start.out 2>&1 &

x：表示需要替换的，√：表示修改后的。

6、再次测试

进入/usr/local/nacos/bin目录下，执行启动命令

./startup.sh

输出结果：

/usr/local/java/jdk-11.0.10/bin/java  -Xms512m -Xmx512m -Xmn256m -Dnacos.standalone=true -Dnacos.member.list= -Xlog:gc*:file=/usr/local/nacos/logs/nacos_gc.log:time,tags:filecount=10,filesize=102400 -Dloader.path=/usr/local/nacos/plugins/health,/usr/local/nacos/plugins/cmdb -Dnacos.home=/usr/local/nacos -jar /usr/local/nacos/target/nacos-server.jar  --spring.config.additional-location=file:/usr/local/nacos/conf/ --logging.config=/usr/local/nacos/conf/nacos-logback.xml --server.max-http-header-size=524288
nacos is starting with standalone
nacos is starting，you can check the /usr/local/nacos/logs/start.out

表示之前启动问题解决，启动成功。

7、访问nacos

打开浏览器输入CentOS地址+端口+项目访问，即可看到nacos登录页面。

http://192.168.56.10:8848/nacos

8、随机启动配置

8.1、进入 /lib/systemd/system目录

cd  /lib/systemd/system

8.2、在该目录下，创建文件nacos启动文件

vi nacos.service

添加内容如下

[Unit]
Description=nacos
After=network.target
 
[Service]
Environment="JAVA_HOME=/usr/local/java/jdk-11.0.10"
Type=forking
ExecStart=/usr/local/nacos/bin/startup.sh -m standalone
ExecReload=/usr/local/nacos/bin/shutdown.sh
ExecStop=/usr/local/nacos/nacos/bin/shutdown.sh
PrivateTmp=true
 
[Install]
WantedBy=multi-user.target

注意：修改自己nacos所在路径

8.3、重载所有服务

systemctl daemon-reload

8.4、设置开机启动

systemctl enable nacos.service

8.5、查看开机启动状态

systemctl is-enabled nacos.service

8.6、查看服务状态

systemctl status nacos

8.7、手动启动 Nacos

systemctl start nacos

8.7、手动停止Nacos

systemctl stop nacos

8.8、手动重启

systemctl restart nacos

9、测试自启动

重启CentOS系统，查看Nacos是否自自动

查看Nacos服务状态

systemctl status nacos

输出结果：

● nacos.service - nacos
   Loaded: loaded (/usr/lib/systemd/system/nacos.service; enabled; vendor preset: disabled)
   Active: active (running) since Mon 2022-10-24 15:15:16 UTC; 1min 7s ago
  Process: 707 ExecStart=/usr/local/nacos/bin/startup.sh -m standalone (code=exited, status=0/SUCCESS)
    Tasks: 194
   Memory: 547.8M
   CGroup: /system.slice/nacos.service
           └─748 /usr/local/java/jdk-11.0.10/bin/java -Xms512m -Xmx512m -Xmn256m -Dnacos.standalone=true -Dnacos.member.list= -Xlog:gc*:file=/usr/local/nacos/logs/nacos_gc.log:time,tag...

Oct 24 15:15:15 10.0.2.15 systemd[1]: Starting nacos...
Oct 24 15:15:16 10.0.2.15 startup.sh[707]: /usr/local/java/jdk-11.0.10/bin/java  -Xms512m -Xmx512m -Xmn256m -Dnacos.standalone=true -Dnacos.member.list= -Xlog:gc*:file=/usr...s.home=/usr/
Oct 24 15:15:16 10.0.2.15 startup.sh[707]: nacos is starting with standalone
Oct 24 15:15:16 10.0.2.15 startup.sh[707]: nacos is starting，you can check the /usr/local/nacos/logs/start.out
Oct 24 15:15:16 10.0.2.15 systemd[1]: Started nacos.
Hint: Some lines were ellipsized, use -l to show in full.

表示已经启动成功。

通过IP+端口+项目访问登录页面测试

http://192.168.56.10:8848/nacos

已经可以成功访问Nacos登录页面了。