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sources/tech/20191111 Bash Script to Monitor Disk Space Usage on Multiple Remote Linux Systems With eMail Alert.md
201 lines
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201 lines
8.0 KiB
Markdown
[#]: collector: (lujun9972)
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[#]: translator: ( )
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[#]: reviewer: ( )
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[#]: publisher: ( )
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[#]: url: ( )
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[#]: subject: (Bash Script to Monitor Disk Space Usage on Multiple Remote Linux Systems With eMail Alert)
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[#]: via: (https://www.2daygeek.com/linux-bash-script-to-monitor-disk-space-usage-on-multiple-remote-linux-systems-send-email/)
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[#]: author: (Magesh Maruthamuthu https://www.2daygeek.com/author/magesh/)
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Bash Script to Monitor Disk Space Usage on Multiple Remote Linux Systems With eMail Alert
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======
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Some time ago, we had wrote **[Bash script to monitor disk space usage on a Linux][1]** system with an email alert.
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That script works on a single machine, and you have to put the script on the corresponding machine.
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If you want to set disk space usage alerts on multiple computers at the same time, that script does not help you.
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So we have written this new **[shell script][2]** to achieve this.
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To do so, you need a JUMP server (centralized server) that can communicate with any other computer without a password.
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This means that password-less authentication must be set as a prerequisite.
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When the prerequisite is complete, run the script on the JUMP server.
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Finally add a **[cronjob][3]** to completely automate this process.
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Three shell scripts are included in this article, and choose the one you like.
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### 1) Bash Script-1: Bash Script to Check Disk Space Usage on Multiple Remote Linux Systems and Print Output on Terminal
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This **[bash script][4]** checks the disk space usage on a given remote machine and print the output to the terminal if the system reaches the specified threshold.
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In this example, we set the threshold limit to 80% for testing purpose and you can adjust this limit to suit your needs.
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Also, replace your email id instead of us to receive this alert.
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```
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# vi /opt/scripts/disk-usage-multiple.sh
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#!/bin/sh
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output1=/tmp/disk-usage.out
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echo "---------------------------------------------------------------------------"
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echo "HostName Filesystem Size Used Avail Use% Mounted on"
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echo "---------------------------------------------------------------------------"
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for server in `more /opt/scripts/servers.txt`
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do
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output=`ssh $server df -Ph | tail -n +2 | sed s/%//g | awk '{ if($5 > 80) print $0;}'`
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echo "$server: $output" >> $output1
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done
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cat $output1 | grep G | column -t
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rm $output1
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```
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Run the script file once you have added the above script to a file.
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```
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# sh /opt/scripts/disk-usage-multiple.sh
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```
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You get an output like the one below.
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```
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------------------------------------------------------------------------------------------------
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HostName Filesystem Size Used Avail Use% Mounted on
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------------------------------------------------------------------------------------------------
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server01: /dev/mapper/vg_root-lv_red 5.0G 4.3G 784M 85 /var/log/httpd
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server02: /dev/mapper/vg_root-lv_var 5.8G 4.5G 1.1G 81 /var
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server03: /dev/mapper/vg01-LogVol01 5.7G 4.5G 1003M 82 /usr
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server04: /dev/mapper/vg01-LogVol04 4.9G 3.9G 711M 85 /usr
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server05: /dev/mapper/vg_root-lv_u01 74G 56G 15G 80 /u01
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```
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### 2) Shell Script-2: Shell Script to Monitor Disk Space Usage on Multiple Remote Linux Systems With eMail Alerts
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This shell script checks the disk space usage on a given remote machine and sends the output via a mail in a simple text once the system reaches the specified threshold.
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```
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# vi /opt/scripts/disk-usage-multiple-1.sh
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#!/bin/sh
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SUBJECT="Disk Usage Report on "`date`""
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MESSAGE="/tmp/disk-usage.out"
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MESSAGE1="/tmp/disk-usage-1.out"
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TO="[email protected]"
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echo "---------------------------------------------------------------------------------------------------" >> $MESSAGE1
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echo "HostName Filesystem Size Used Avail Use% Mounted on" >> $MESSAGE1
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echo "---------------------------------------------------------------------------------------------------" >> $MESSAGE1
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for server in `more /opt/scripts/servers.txt`
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do
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output=`ssh $server df -Ph | tail -n +2 | sed s/%//g | awk '{ if($5 > 80) print $0;}'`
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echo "$server: $output" >> $MESSAGE
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done
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cat $MESSAGE | grep G | column -t >> $MESSAGE1
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mail -s "$SUBJECT" "$TO" < $MESSAGE1
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rm $MESSAGE
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rm $MESSAGE1
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```
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Run the script file once you have added the above script to a file.
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```
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# sh /opt/scripts/disk-usage-multiple-1.sh
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```
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You get an output like the one below.
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```
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------------------------------------------------------------------------------------------------
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HostName Filesystem Size Used Avail Use% Mounted on
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------------------------------------------------------------------------------------------------
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server01: /dev/mapper/vg_root-lv_red 5.0G 4.3G 784M 85 /var/log/httpd
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server02: /dev/mapper/vg_root-lv_var 5.8G 4.5G 1.1G 81 /var
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server03: /dev/mapper/vg01-LogVol01 5.7G 4.5G 1003M 82 /usr
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server04: /dev/mapper/vg01-LogVol04 4.9G 3.9G 711M 85 /usr
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server05: /dev/mapper/vg_root-lv_u01 74G 56G 15G 80 /u01
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```
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Finally add a cronjob to automate this. It will run every 10 minutes.
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```
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# crontab -e
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*/10 * * * * /bin/bash /opt/scripts/disk-usage-multiple-1.sh
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```
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### 3) Bash Script-3: Bash Script to Monitor Disk Space Usage on Multiple Remote Linux Systems With eMail Alerts
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This shell script checks the disk space usage on a given remote machine and sends the output via the mail with a CSV file if the system reaches the specified threshold.
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```
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# vi /opt/scripts/disk-usage-multiple-2.sh
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#!/bin/sh
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MESSAGE="/tmp/disk-usage.out"
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MESSAGE2="/tmp/disk-usage-1.csv"
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echo "Server Name, Filesystem, Size, Used, Avail, Use%, Mounted on" > $MESSAGE2
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for server in thvtstrhl7 thvrhel6
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for server in `more /opt/scripts/servers-disk-usage.txt`
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do
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output1=`ssh $server df -Ph | tail -n +2 | sed s/%//g | awk '{ if($5 > 80) print $0;}'`
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echo "$server $output1" >> $MESSAGE
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done
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cat $MESSAGE | grep G | column -t | while read output;
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do
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Sname=$(echo $output | awk '{print $1}')
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Fsystem=$(echo $output | awk '{print $2}')
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Size=$(echo $output | awk '{print $3}')
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Used=$(echo $output | awk '{print $4}')
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Avail=$(echo $output | awk '{print $5}')
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Use=$(echo $output | awk '{print $6}')
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Mnt=$(echo $output | awk '{print $7}')
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echo "$Sname,$Fsystem,$Size,$Used,$Avail,$Use,$Mnt" >> $MESSAGE2
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done
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echo "Disk Usage Report for `date +"%B %Y"`" | mailx -s "Disk Usage Report on `date`" -a /tmp/disk-usage-1.csv [email protected]
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rm $MESSAGE
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rm $MESSAGE2
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```
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Run the script file once you have added the above script to a file.
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```
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# sh /opt/scripts/disk-usage-multiple-2.sh
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```
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You get an output like the one below.
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![][5]
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Finally add a cronjob to automate this. It will run every 10 minutes.
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```
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# crontab -e
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*/10 * * * * /bin/bash /opt/scripts/disk-usage-multiple-1.sh
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```
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**Note:** Because the script is scheduled to run once every 10 minutes, you will receive an email alert every 10 minutes.
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If your system reaches a given limit after 18 minutes, you will receive an email alert on the second cycle, such as after 20 minutes (2nd 10 minute cycle).
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--------------------------------------------------------------------------------
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via: https://www.2daygeek.com/linux-bash-script-to-monitor-disk-space-usage-on-multiple-remote-linux-systems-send-email/
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作者：[Magesh Maruthamuthu][a]
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选题：[lujun9972][b]
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]: https://www.2daygeek.com/author/magesh/
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[b]: https://github.com/lujun9972
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[1]: https://www.2daygeek.com/linux-shell-script-to-monitor-disk-space-usage-and-send-email/
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[2]: https://www.2daygeek.com/category/shell-script/
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[3]: https://www.2daygeek.com/crontab-cronjob-to-schedule-jobs-in-linux/
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[4]: https://www.2daygeek.com/category/bash-script/
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[5]: data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7
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