Contents
1. 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 #Designation of e-mail address to be notified 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 Confirmation
①Check current utilization
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# df -h |
It appears as follows
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Filesystem Size Used Avail Use% Mounted on udev 970M 0 970M 0% /dev tmpfs 197M 23M 175M 12% /run /dev/sda1 19G 3.8G 14G 22% / tmpfs 985M 0 985M 0% /dev/shm tmpfs 5.0M 0 5.0M 0% /run/lock tmpfs 985M 0 985M 0% /sys/fs/cgroup tmpfs 197M 0 197M 0% /run/user/1000 |
②Create a dummy file to have at least 80% utilization (in the example, it is named "dummyfile" and is about 13G)
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# dd if=/dev/zero of=dummyfile bs=1M count=13000 |
③confirmation
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# df -h |
Confirmation that it is 80% or higher
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 : 94%".
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 default configuration file
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# cp /usr/share/logwatch/default.conf/logwatch.conf /etc/logwatch/conf/ |
②Change email address, etc.
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# vi /etc/logwatch/conf/logwatch.conf Line 54 : #MailTo = root ← Comment out and add the following MailTo =[your mailaddress] Line 87 : 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 you will receive daily report emails.
If you want to check it immediately, do the following
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# /etc/cron.daily/00logwatch |