How to monitor whether a running service is healthy and mail alerts

Monitoring services, which are placed on crontab tasks, individuals do not like to use a dead loop to run in the background.

So every time 3 cycles are executed, 3 cycles in a row, and any one of the services is down, the alarm will be reported.

Popularize small knowledge, pay attention to redirect 3 kinds of writing, in fact, the effect is the same.

#!/bin/bashnmap -p 6065 10.31.6.6  | egrep  "6065/tcp open"    &>/dev/nullcode1=$?nmap -p 80 10.31.6.6  | grep  "80/tcp open   http " >/dev/null  2>&1code2=$?curl http://10.31.6.6/test.html/  >&/dev/nullcode3=$?my_mail () {mail_list= ("[email protected]"   "[email protected]"  ) Now_date= ' date  "+%y-%m-%d %t" ' for i in ${mail_list[@]}doecho -e  "webchat  is down,please check;\nip:42.62.5.100\n$now_date " | mail -s " webchat  Down "   $idone}n=1count=1while  ((n<4)) doif [  $code 1 = 0 ] & & [  $code 2 = 0 ] && [  $code 3 = 0 ]then  n=$ (($n + 1))  sleep 2else count=$ (($count + 1))  n=$ (($n + 1))  sleep 2 if  [  $count  -Eq 3 ];then  my_mail fi         fidone 

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How to monitor whether a running service is healthy and mail alerts