1. Introduce disk usage check script
# vi disk_capacity_check.sh
#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
1.2 Execution check
①Check current usage
tmpfs 390M 1.6M 388M 1% /run
/dev/mapper/ubuntu--vg-ubuntu--lv 9.8G 4.9G 4.4G 53% /
tmpfs 1.9G 0 1.9G 0% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
/dev/sda2 1.8G 125M 1.5G 8% /boot
tmpfs 390M 4.0K 390M 1% /run/user/1000
②Create a dummy file (in the example, it is called "dummyfile" and is about 4G) so that the utilization is 80% or more.
# dd if=/dev/zero of=dummyfile bs=1M count=4000
Run it and make sure it is above 80%.
④Run disk space check script
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 : 95%".
⑤Delete the "dummyfile" you created.
⑥Periodic Execution Setting
30 2 * * * /opt/script/disk_capacity_check.sh
2. Log analysis tool logwatch installed
2.1 Install logwatch
2.2 Edit logwatch configuration file
①Copy the default configuration file
②Change the destination of your email, etc.
# 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.
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