How to monitor multiple hosts by shell
Editor to share with you how shell monitors multiple hosts, I believe most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's learn about it!
First of all, you need to establish a trust relationship between the monitored host and the monitored host. For those who do not know ssh certificate verification, please take a look at:
Http://dragon123.blog.51cto.com/9152073/1586795
Install mutt:
[root@centos-server ~] # yum install mutt
Monitoring list:
[root@centos-server] # cat > iplist.txt 22.22.22.129 > 22.22.22.130 > 22.22.22.134 > end
Monitoring script:
#! / bin/bashfor ip in `cat iplist.txt`; do ping $ip-C1 > / dev/null # first check whether the host is online, and if it is online, further monitor if [$?-eq 0]; then rootused= ``ssh $ip df-h | grep / $| awk'{print $4}'| cut-d%-f1` # take root directory usage for hardid in `ssh $ip df-h | grep "^\ / dev\ / s [aMuz] [AMAZ]" | awk'{print $1}'`| Dohardused= ``ssh $ip df-h | grep $hardid | awk'{print $5}'| cut-d%-f1` # take the usage of other local hard disks done memtotal= `ssh $ip free-m | grep Mem | awk'{print $2} '`memused= `ssh $ip free-m | grep Mem | awk' {print $3} '`mem= `expr $memused\ * 100 / $memtotal`idelcpu= `ssh $ip top-N1 | grep Cpu | awk' {print $5}'| cut-d "."-f1`cpuused= `expr 100-$idelcpu`if [$mem-gt 70] Then # notify echo "warm:$ip memory is $mem" if memory usage is higher than 70% | mutt-s "monitor report" 18507656225@163.comfiif [$hardused-le 80]; then # email notify echo "warm:$ip the Hard drive capacity is more 80%" if hard disk usage is higher than 80% | mutt-s "monitor report" 18507656225@163.comfiif [$rootused-le 80] Then # notify echo "warm:$ip the Hard drive capacity is more 80%" by email if the hard disk has been used by more than 80% | mutt-s "monitor report" 18507656225@163.com fifor hardid in `ssh $ip iostat | grep "^ s [amerz] [amerz]" | awk'{print $1}'` Do # prefetch character iostat= `ssh $ip iostat-x | grep $hardid | awk'{print $12}'| cut-d "."-f1` # get io busy echo $iostat if [$iostat-gt 80] Then # if the io is busy more than 80%, notify echo "ipaddress:$ip,hard:$hardid,iostat:$iostat" | mutt-s "warm" 18507656225@163.com fi doneelse echo "host:$ip is not alive" | mutt-s "monitor report" 18507656225@163.com # notify fidone by mail if the host is unable to ping
Monitor every 5 minutes (if there is a problem and this is not resolved, receive an email every 5 minutes, which is very troublesome):
[root@centos-server] # crontab-e
* / 5 * bash / root/monitor.sh
Check email:
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