centos7制作开机自启动服务

Posted 2021-08-28 mingyuewu

centos7 制作开机自启动服务

文章目录

• centos7 制作开机自启动服务
• • 一、 zookeeper
  • 二、nginx
  • 三、redis
  • 四、Tomcat
  • 五、格式说明
  • 六、开机自启服务举例

自启动服务脚本路径	/usr/lib/systemd/system/zookeeper.service
查看所有的开机自启动服务	systemctl list-units --type=service

一、 zookeeper

vim /usr/lib/systemd/system/zookeeper.service

1 编写自启动脚本

cat >/usr/lib/systemd/system/zookeeper.service<<EOF
[Unit]
Description=Zookeeper
After=network.target
[Service]
Type=forking
Environment=ZOO_LOG_DIR=/usr/local/zookeeper/logs
Environment=PATH=/usr/local/jdk1.8.0_231/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin
PIDFile=/usr/local/zookeeper/data/zookeeper/zookeeper_server.pid
ExecStart=/usr/local/zookeeper/bin/zkServer.sh start
ExecStop=/usr/local/zookeeper/bin/zkServer.sh stop
ExecRestart=/usr/local/zookeeper/bin/zkServer.sh restart
Restart=on-failure
User=zookeeper
Group=zookeeper
[Install]
WantedBy=multi-user.target
EOF

2、配置zookeeper系统服务及自启动

systemctl daemon-reload
systemctl enable zookeeper.service

3、启动与停止zookeeper服务

systemctl start zookeeper
ps -ef|grep zookeeper
systemctl stop zookeeper

二、nginx

1 编写服务脚本

vim /usr/lib/systemd/system/nginx.service 
[Unit]
Description=Nginx
After=network.target remote-fs.target nss-lookup.target

[Service]
Type=forking
ExecStart=/usr/local/nginx/sbin/nginx -c /usr/local/nginx/conf/nginx.conf
ExecReload=/usr/local/nginx/sbin/nginx -s reload
ExecStop=/usr/local/nginx/sbin/nginx -s stop
Restart=on-failure
User=nginx
Group=nginx
[Install]
WantedBy=multi-user.target

配置nginx的负载均衡时,upstream 中的server 要配置内网IP

curl -v URL curl 是客户端（client)URL的简写，-v参数输出整个通信过程

三、redis

vim  /usr/lib/systemd/system/redis.service
[Unit]
Description=Redis
After=network.target remote-fs.target nss-lookup.target

[Service]
Type=forking
ExecStart=/usr/local/bin/redis-server /etc/redis.conf
ExecStop=kill -INT `cat /usr/local/redis/logs/redis.pid`
Restart=on-failure
User=redis
Group=redis

[Install]
WantedBy=multi-user.target

四、Tomcat

vim  /usr/lib/systemd/system/tomcat.service
[root@node01 system]# cat tomcat.service 
[Unit]
Description=Tomcat
After=syslog.target network.target remote-fs.target nss-lookup.target

[Service]
Type=forking
PIDFILE=/usr/local/tomcat/logs/tomcat.pid
ExecStart=/usr/local/tomcat/bin/catalina.sh start  
ExecStop=/usr/local/tomcat/bin/catalina.sh stop
ExecReload=/bin/kill -s HUP $MAINPID

[Install]
WantedBy=multi-user.target

使用systemctl status tomcat启动tomcat时，

报错Neither the JAVA_HOME nor the JRE_HOME environment variable is defined

虽然配置了JDK的环境变量，但tomcat无法识别，需要手动在/usr/local/tomcat/bin/catalina.sh脚本开头，添加java_home和jre_home

######jdk  jre path
export  JAVA_HOME=/usr/local/jdk1.8.0_231
export  JRE_HOME=/usr/local/jdk1.8.0_231/jre

五、格式说明

[Unit]  服务的说明
Description:描述服务
After:描述服务类别

[Service]服务运行参数的设置
Type=forking是后台运行的形式
PIDFILE=pid文件路径
ExecStart为服务的具体运行命令
ExecReload为重启命令
ExecStop为停止命令
PrivateTmp=True表示给服务分配独立的临时空间
User
Group   运行该服务的用户和组
注意：启动、重启、停止命令全部要求使用绝对路径

[Install]服务安装的相关设置，可设置为多用户

六、开机自启服务举例

systemctl list-units --type=service
UNIT                               LOAD   ACTIVE SUB     DESCRIPTION
  crond.service                      loaded active running Command Scheduler
  docker.service                     loaded active running Docker Application Container Engine
  mysqld.service                     loaded active running MySQL Server
● nginx.service                      loaded failed failed  SYSV: Nginx is an HTTP(S) server, HTTP(S) reverse proxy and IMAP/POP3 proxy server
  node_exporter.service              loaded active running node_exporter
  prometheus.service                 loaded active running Prometheus
  redis.service                      loaded active running redis-server
  rsyslog.service                    loaded active running System Logging Service  [e-mail]         loaded active running Serial Getty on ttyS0
  sshd.service                       loaded active running OpenSSH server daemon
  sysstat.service                    loaded active exited  Resets System Activity Logs
  tomcat.service                     
  zookeeper.service