Contents
1. Introduce disk usage check script
1.1 Script Creation
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# cd /opt/script/ # vi disk_capacity_check.sh |
Contents of disk_capacity_check.sh
Configured to notify when disk usage exceeds 80%.
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#!/bin/bash #Email Address for Notification MAIL="<your mailaddress> " DVAL=`/bin/df / | /usr/bin/tail -1 | /bin/sed 's/^.* \([0-9]*\)%.*$/\1/'` if [ $DVAL -gt 80 ]; then echo "Disk usage alert: $DVAL %" | mail -s "Disk Space Alert in `hostname`" $MAIL fi |
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# chmod 700 disk_capacity_check.sh |
1.2 Execution check
①Check current usage
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# df -h |
It appears as follows
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Filesystem Size Used Avail Use% Mounted on udev 951M 0 951M 0% /dev tmpfs 194M 728K 193M 1% /run /dev/sda1 19G 4.2G 14G 24% / tmpfs 968M 0 968M 0% /dev/shm tmpfs 5.0M 0 5.0M 0% /run/lock tmpfs 194M 0 194M 0% /run/user/1000 |
②Create a dummy file (in the example, it is called "dummyfile" and is about 13G) so that the utilization is 80% or more.
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# dd if=/dev/zero of=dummyfile bs=1M count=13000 |
③Re-confirmation
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# df -h |
Run it and make sure it is above 80%.
④Run disk space check script
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# /opt/script/disk_capacity_check.sh |
You will receive an e-mail to the e-mail address you have set up with the body of the message as "Disk usage alert : 96%".
⑤Delete the "dummyfile" you created.
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# rm dummyfile |
⑥Periodic Execution Setting
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# crontab -e 30 2 * * * /opt/script/disk_capacity_check.sh |
2.Log analysis tool logwatch installed
2.1 logwatch Install
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# apt -y install logwatch |
2.2 Edit logwatch configuration file
①Copy the default configuration file
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# cp /usr/share/logwatch/default.conf/logwatch.conf /etc/logwatch/conf/ |
②Change the destination of your email, etc.
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# vi /etc/logwatch/conf/logwatch.conf Line 50 #MailTo = root← Comment out and add the following MailTo =<your mailaddress> ← Mailing address Line 83 Detail = High |
2.3 Creating Directories
There is no directory used by the cache, so create one.
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# mkdir /var/cache/logwatch |
2.4 operation check
When logwatch is installed, cron is registered by default, so daily report emails are sent
If you want to check it immediately, do the following
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# /etc/cron.daily/00logwatch |