添加开机自启服务 (Zookeeper、Tomcat)

1.将Zookeeper添加到开机自启服务

在/usr/lib/systemd/system/文件夹下创建一个启动脚本zookeeper.service

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

插入以下内容

[Unit]
Description=zookeeper
After=syslog.target network.target
[Service]

Type=forking
Environment='JAVA_HOME=/export/server/jdk1.8.0_144'

Environment=ZOO_LOG_DIR=/export/server/zookeeper/log

ExecStart=/export/server/zookeeper/bin/zkServer.sh start

ExecStop=/export/server/zookeeper/bin/zkServer.sh stop

ExecReload=/bin/kill -s HUP $MAINPID

PrivateTmp=true
[Install]

WantedBy=multi-user.target

将Path改为安装zookeeper的Path

为什么要给ZOO_LOG_DIR赋值呢？

打开bin/zkEnv.sh，搜索ZOO_LOG_DIR，你会发现下面这段

if [ "x${ZOO_LOG_DIR}" = "x" ]
then
    ZOO_LOG_DIR="."

ZOO_LOG_DIR如果未指定，则它的值为你启动zookeeper时的当前目录，而bin/zkServer.sh启动时又是先调用zkEnv.sh，然后创建一个${ZOO_LOG_DIR}/zookeeper.out日志文件

或者你直接在zkEnv.sh或zkServer.sh指定ZOO_LOG_DIR的值也是可以的

#通知systemd重载此配置文件
systemctl daemon-reload 

#启动服务
systemctl start zookeeper
#设置开机自启
systemctl enable zookeeper

2.将Tomcat添加到开机自启服务

在/usr/lib/systemd/system目录下增加启动脚本tomcat.service

vi /usr/lib/systemd/system/tomcat.service

[Unit]
Description=Tomcat
After=syslog.target network.target remote-fs.target nss-lookup.target
[Service]

Type=forking

PIDFile=/export/server/apache-tomcat-8.5.23/tomcat.pid

ExecStart=/export/server/apache-tomcat-8.5.23/bin/startup.sh

ExecReload=/bin/kill -s HUP $MAINPID

ExecStop=/bin/kill -s QUIT $MAINPID

PrivateTmp=true
[Install]

WantedBy=multi-user.target

将Path改为安装tomcat的Path

在apache-tomcat-8.5.23/bin/目录下，增加setenv.sh配置，

切换到apache-tomcat-8.5.23下的bin目录下，

vi setenv.sh

引入以下环境变量(需修改为你自己的tomcat和jdk安装路径)

export CATALINA_HOME=/export/server/apache-tomcat-8.5.23							
export CATALINA_BASE=/export/server/apache-tomcat-8.5.23
export JAVA_HOME=/export/server/jdk1.8
#add tomcat pid
CATALINA_PID="$CATALINA_BASE/tomcat.pid"                            

为什么要引入这些变量呢?

在查看了tomcat启动脚本以后,发现脚本内部其实是执行的catalina.sh

PRGDIR=`dirname "$PRG"`
EXECUTABLE=catalina.sh
Check that target executable exists
if $os400; then
-x will Only work on the os400 if the files are:
1. owned by the user
2. owned by the PRIMARY group of the user
this will not work if the user belongs in secondary groups
eval

else

if [ ! -x "PRGDIR"/"EXECUTABLE" ]; then

echo "Cannot find PRGDIR/EXECUTABLE"

echo "The file is absent or does not have execute permission"

echo "This file is needed to run this program"

exit 1

fi

fi
exec "PRGDIR"/"EXECUTABLE" start "$@"

所以我们再次追踪到了catalina.sh脚本

发现脚本使用到以上几个变量,如果找不到就会执行bin/setenv.sh,所以我们写了一个setenv.sh并且把catalina.sh所需的几个变量都添加了进去

#通知systemd重载此配置文件
systemctl daemon-reload 

#启动服务
systemctl start tomcat
#设置开机自启
systemctl enable tomcat