背景

Linux环境中有个很重要的服务需要持续运行，发现服务停止后能够自动拉起
下面是我在项目中用到的监控click house服务的监控脚本，每隔10秒去检查一次
shell脚本后台启动命令 nohup sh checkprocess.sh &

#! /bin/bash
#restart scrape news process if the process exited accidentally

log_file="restart_sh.log"

# return the current date time
TIMESTAMP(){
    echo $(date "+%Y-%m-%d %H:%M:%S")
}


restart_process_if_die(){
 
    # echo "paras is: $@"
    be_running=$(ps -ef | grep $restart_process |  grep -v grep  | wc -l)
    if [ $be_running -eq 0 ];
    then
        echo "$(TIMESTAMP) $restart_process got down, now I will restart it" | tee -a $log_file
       
        echo "Now I am in $PWD"
	echo $start_file
        eval $start_file
       
        echo "$(TIMESTAMP) $restart_process restart successfully" | tee -a $log_file
      
    else
        echo "$(TIMESTAMP) $restart_process is running, no need to restart"
    fi
}

restart_process="clickhouse-server"
start_file="/usr/hdp/2.2.0.0-2041/clickhouse/bin/clickhouse server -C /usr/hdp/2.2.0.0-2041/clickhouse/conf/clickhouse-server/config.xml -P /usr/hdp/2.2.0.0-2041/clickhouse/clickhouse-server.pid --daemon"




while :
do
    restart_process_if_die
    echo "$(TIMESTAMP) now I will sleep 10S"
    sleep 10
done