防止进程意外关闭，定时查询进程存在进行预警或重启。

#!/bin/bash
num=$(ps -ef|grep canal-1.0 -c)
if [[ ${num} -lt 2 ]];then
    echo  $(date)"失败"
    nohup java -jar  ~/canal-1.0-SNAPSHOT-jar-with-dependencies.jar >> ~/canal_client.log  2>&1 &
    token='token'
    curl 'https://oapi.dingtalk.com/robot/send?access_token='$token'' \
             -H 'Content-Type: application/json' \
               -d '
         {"msgtype": "text",
               "text": {
                 "content":"canal error"
                   }
                     } ' -s
    echo  $(date)"重启成功"
fi

添加定时任务crontab -e

*/1 * * * *  /home/admin/canal_monitor.sh 2>&1 >> ～/canal_monitor.log

查看监控执行日志

sudo less /var/log/cron