1. Logwatch
①Install
# yum install logwatch
②Edit configuration file
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# cat /usr/share/logwatch/default.conf/logwatch.conf >> /etc/logwatch/conf/logwatch.conf # vi /etc/logwatch/conf/logwatch.conf |
●Per line 45 Insert "#" at the beginning of the "MailTo = root" line and set the email address you want to receive notifications to the line below it. #MailTo = root MailTo = [Email address] ●Per line 7: Set the level of detail for log notifications #Detail = Low Detail = High
③Output Logwatch reports
# logwatch --output stdout
You will get the following message
################### Logwatch 7.6 (01/22/22) #################### Processing Initiated: Fri May 13 09:41:46 2022 Date Range Processed: yesterday ( 2022-May-12 ) Period is day. Detail Level of Output: 10 Type of Output/Format: stdout / text Logfiles for Host: fedora ########################################################### --------------------- Amavisd-new Begin ------------------------ ----omission----- -------------------- Disk Space Begin ------------------------ Filesystem Size Used Avail Use% Mounted on /dev/mapper/fedora_fedora-root 15G 4.4G 11G 30% / /dev/nvme0n1p1 1014M 245M 770M 25% /boot ---------------------- Disk Space End ------------------------- ###################### Logwatch End #########################
④Test to see if the report arrives at the address you set.
Check if you receive a log report email like the one above.
# /etc/cron.daily/0logwatch
2.Introduce disk usage check script
2.1 Script Creation
# cd /var/www/system # vi disk_capacity_check.sh
Contents of disk_capacity_check.sh
#!/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
# chmod 700 disk_capacity_check.sh
2.2 Execution Confirmation
①Check current utilization
# df -h
It appears as follows
Filesystem Size Used Avail Use% Mounted on devtmpfs 898M 0 898M 0% /dev tmpfs 910M 0 910M 0% /dev/shm tmpfs 910M 9.7M 900M 2% /run tmpfs 910M 0 910M 0% /sys/fs/cgroup /dev/mapper/centos_lepard-root 17G 5.0G 13G 29% / /dev/sda1 1014M 185M 830M 19% /boot tmpfs 182M 0 182M 0% /run/user/1000 tmpfs 182M 0 182M 0% /run/user/0
②Create a dummy file (in the example, it is named "dummyfile" and is about 10G) so that the utilization is 80% or more.
# dd if=/dev/zero of=dummyfile bs=1M count=10000
③check again
# df -h
Run it and make sure it is above 80%.
④Run disk space check script
# /var/www/system/disk_capacity_check.sh
You will receive an email to the email address you set up with the body of the message as "Disk usage alert : 87%".
⑤Delete the "dummyfile" you created.
# rm dummyfile
⑥Periodic Execution Setting
# crontab -e 30 2 * * * /var/www/system/disk_capacity_check.sh
