“Reader welfare! 2 TB of all kinds of technical resources for free”

The application scenario of the program is as follows: The program is used to monitor program logs of the Linux server. If the keyword is abnormal, corresponding actions or alarms are triggered to notify email contacts.

First, install mail service

1. Unpack

Tar -jxf mailx-12.4.tar.bz2 -c /usr/src/&& CD /usr/src/mailx-12.4/Copy the code

2, compile,

make install UCBINSTALL=/usr/bin/installCopy the code

Abnormal compilation error -1

Exception error resolution

Download the mailx patch file mailx-12.4-openSSL_1.0.0_build_fix-1. Patch and save the patch file and the mailx decompressed directory in the same path

Run the patch installation command:

Patch - p0 < mailx - 12.4 - openssl_1. 0.0 _build_fix - 1. The patchCopy the code

Go to mailx-12.4 and run the following command again:

make install UCBINSTALL=/usr/bin/installCopy the code

Check whether the Mailx is installed successfully: mailx -v

3, configuration,

Vi /etc/nail.rc, added at the end of the file

set from=

set smtp=

set smtp-auth-user=

set smtp-auth-password=

set smtp-auth=login

As shown in the following figure, save the configuration after modification

4. Test sending emails

Echo ‘E-mail’ | mailx – v – “email subject” s email address

So far, the email function test is normal. The next step is to write the keyword monitoring script. You can use the log keyword script to trigger the email alarm script to monitor logs

Second, keyword monitoring script development

Checklogs. sh Log monitor

Sendmail. sh Mail sending script, which can be customized

Conf Configuration file directory. Chklist is the configuration file

The first execution of the checklogs.sh script reads the log file and records the number of lines currently read

The script reads the update log. For example, if nine lines of data are updated in the current log, the script obtains the keyword from the latest nine lines

Test insert keyword error

If you continue executing the script, you can see that the keyword has been captured and an alarm is triggered

Test for multiple keywords

Execute again and you can see that the latest updated log information has been captured

Test frequency control

At this point the relevant functional tests have been completed.

Almost forgot to tell you the complete script code, just in the [migrant elder sister technology road] public account dialog box reply keyword “log monitoring” can get the complete code.

Original: https://www.toutiao.com/a6770513931053040131/

The latest 2TB technology dry goods: including system operation and maintenance, database, Redis, MogoDB, e-books, Java foundation course, Java practice project, architect comprehensive tutorial, architect practice project, big data, Docker container, ELK Stack, machine learning, BAT interview intensive video, etc. In the wechat public account dialog box reply keyword: 1024 you can get all the information.

Being is the END being

Excellent article recommendation:

The 37-year-old farmer’s experience of looking for a job made him cry.

The star + 5.2 k! Open source, powerful WAF VeryNginx!

Cow force! This programmer has created a “licking dog” must-have artifact (open source)!

Code cloud suffered DDoS attacks, the official issued solutions and reported

Mind mapping for Linux

Essential skills! Shell programming practice case sharing (PDF version)!

Click [read article] to find out more

Click a look, forward to support it ↓↓ ↓