1. 业务场景

用于单机生产环境，防止服务器断电或者强制重启导致的服务下线。

2. 实现方案

1. 对于无状态服务，可容器部署设置 restart: always，systemctl eable docker
2. 对于有状态服务，可编写自启脚本，如下

• ① 编写执行脚本

#!/bin/bash
APP_NAME=saveName
PROG_NAME=$0
ACTION=$1
APP_START_TIMEOUT=20    # 等待应用启动的时间
APP_PORT=81 # 应用端口
HEALTH_CHECK_URL=http://127.0.0.1:${APP_PORT}  # 应用健康检查URL
APP_HOME=$(pwd) # 从package.tgz中解压出来的jar包放到这个目录下
HEALTH_CHECK_FILE_DIR=${APP_HOME}/status   # 脚本会在这个目录下生成nginx-status文件
JAR_NAME=${APP_HOME}/app.jar # jar包的名字
JAVA_OUT=/dev/null  #应用的启动日志
JAVA_HOME=${APP_HOME}/jdk-11.0.16
# 创建出相关目录
mkdir -p ${HEALTH_CHECK_FILE_DIR}
#mkdir -p ${APP_HOME}
usage() {echo "Usage: $PROG_NAME {start|stop|restart|init|jdk_install}"exit 2
}
jdk_install() {tar zxvf ${APP_HOME}/jdk-11.0.16_linux-x64_bin.tar.gztee -a /etc/profile << EOFexport JAVA_HOME=${APP_HOME}/jdk-11.0.16export PATH=${APP_HOME}/jdk-11.0.16/bin:\$PATHexport CLASS_PATH=${APP_HOME}/jdk-11.0.16/lib
EOFecho "如没有jdk日志，请手动执行：source /etc/profile &java -version"source /etc/profilejava -version
}
health_check() {exptime=0echo "checking ${HEALTH_CHECK_URL}"while truedostatus_code=`/usr/bin/curl -L -o /dev/null --connect-timeout 5 -s -w %{http_code}  ${HEALTH_CHECK_URL}`if [ "$?" != "0" ]; thenecho -n -e "\rapplication not started"elseecho "code is $status_code"if [ "$status_code" == "401" ];thenbreakfifisleep 5((exptime++))echo -e "\rWait app to pass health check: $exptime..."if [ $exptime -gt ${APP_START_TIMEOUT} ]; thenecho 'app start failed'exit 1fidoneecho "check ${HEALTH_CHECK_URL} success"
}
start_application() {echo "starting java process"echo "nohup java -jar ${JAR_NAME} --spring.profiles.active=${env} > ${JAVA_OUT} 2>&1 &"nohup java -jar ${JAR_NAME} --spring.profiles.active=${env} > ${JAVA_OUT} 2>&1 &echo "started java process"
}stop_application() {checkjavapid=`ps -ef | grep java | grep ${APP_NAME} | grep -v grep |grep -v 'deploy.sh'| awk '{print$2}'`if [[ ! $checkjavapid ]];thenecho -e "\rno java process"returnfiecho "stop java process"times=60for e in $(seq 60)dosleep 1COSTTIME=$(($times - $e ))checkjavapid=`ps -ef | grep java | grep ${APP_NAME} | grep -v grep |grep -v 'deploy.sh'| awk '{print$2}'`if [[ $checkjavapid ]];thenkill -9 $checkjavapidecho -e  "\r        -- stopping java lasts `expr $COSTTIME` seconds."elseecho -e "\rjava process has exited"break;fidoneecho ""
}
start() {start_applicationhealth_check
}
stop() {stop_application
}
case "$ACTION" instart)start;;stop)stop;;restart)stopstart;;jdk_install)jdk_install;;*)usage;;
esac

• ① 编写自启脚本

#!/bin/sh
# chkconfig: 2345 20 20
# clear file
base=baseArg
serveStart() {echo "正在启动Solr"cd baseArg/servesh baseArg/serve/deploy.sh start
}
serveStart

• ② 注册自启脚本至linux开启自动调用目录

ACTION=$1
usage() {echo "Usage: $PROG_NAME {init|stopAll}"exit 2
}
stopAll(){
checkjavapid=`ps -ef |  grep $serveName| awk '{print$2}'`
kill -9 $checkjavapid
}
init(){
base=$(pwd)
sed -i "s|baseArg|${base}|g" $base/autoSave.sh
chmod 777 $base/autoSave.sh
rm -rf /etc/init.d/autoSave.sh
cp -rf $base/autoSave.sh /etc/init.d/autoSave.sh
chmod 777 /etc/init.d/autoSave.sh
chkconfig --add autoSave.sh
chkconfig autoSave.sh on
chkconfig --list
}
case "$ACTION" ininit)init;;stopAll)stopAll;;*)usage;;
esac