shell脚本，用于监视Linux中的消息日志(警告，错误和严重)

该脚本将检查文件中的“警告，错误和严重”，并在/var/log/messages找到与之相关的邮件时触发给指定电子邮件ID的邮件。

我们不能经常运行此脚本，因为如果服务器上有很多匹配的字符串，它将填充您的收件箱，因此我们可以每天运行一次。

如果在昨天的“ /var /log/messages”文件中找到任何给定的字符串，则脚本将向给定的电子邮件ID发送电子邮件警报。

注意：请根据您的要求更改电子邮件ID和内存利用率阈值。

# vi /opt/scripts/os-log-alert.sh

#!/bin/bash

#Set the variable which equal to zero

prev_count=0

count=$(grep -i "`date --date='yesterday' '+%b %e'`" /var/log/messages | egrep -wi 'warning|error|critical' | wc -l)

if [ "$prev_count" -lt "$count" ] ; then

# Send a mail to given email id when errors found in log

SUBJECT="WARNING: Errors found in log on "`date --date='yesterday' '+%b %e'`""

# This is a temp file, which is created to store the email message.

MESSAGE="/tmp/logs.txt"

TO="daygeek@gmail.com"

echo "ATTENTION: Errors are found in /var/log/messages. Please Check with Linux admin." >> $MESSAGE

echo  "Hostname: `hostname`" >> $MESSAGE

echo -e "n" >> $MESSAGE

echo "+------------------------------------------------------------------------------------+" >> $MESSAGE

echo "Error messages in the log file as below" >> $MESSAGE

echo "+------------------------------------------------------------------------------------+" >> $MESSAGE

grep -i "`date --date='yesterday' '+%b %e'`" /var/log/messages | awk '{ $3=""; print}' | egrep -wi 'warning|error|critical' >>  $MESSAGE

mail -s "$SUBJECT" "$TO" < $MESSAGE

#rm $MESSAGE

fi

设置文件的可执行权限os-log-alert.sh。

$ chmod +x /opt/scripts/os-log-alert.sh

最后添加一个cronjob以使其自动化。它将每天早上7点运行。

# crontab -e

0 7 * * * /bin/bash /opt/scripts/os-log-alert.sh

注意：您每天都会在7点收到电子邮件警报，该警报基于前一天的日志。

输出：您将收到类似于以下的电子邮件警报。

ATTENTION: Errors are found in /var/log/messages. Please Check with Linux admin.

+-----------------------------------------------------+

Error messages in the log file as below

+-----------------------------------------------------+

Jul  3 02:40:11 ns1 kernel: php-fpm[3175]: segfault at 299 ip 000055dfe7cc7e25 sp 00007ffd799d7d38 error 4 in php-fpm[55dfe7a89000+3a7000]

Jul  3 02:50:14 ns1 kernel: lmtp[8249]: segfault at 20 ip 00007f9cc05295e4 sp 00007ffc57bca1a0 error 4 in libdovecot-storage.so.0.0.0[7f9cc04df000+148000]

Jul  3 15:36:09 ns1 kernel: php-fpm[17846]: segfault at 299 ip 000055dfe7cc7e25 sp 00007ffd799d7d38 error 4 in php-fpm[55dfe7a89000+3a7000]

Jul  3 15:45:54 ns1 pure-ftpd: (?@5.188.62.5) [WARNING] Authentication failed for user [daygeek]

Jul  3 16:25:36 ns1 pure-ftpd: (?@104.140.148.58) [WARNING] Sorry, cleartext sessions and weak ciphers are not accepted on this server.#012Please reconnect using TLS security mechanisms.

Jul  3 16:44:20 ns1 kernel: php-fpm[8979]: segfault at 299 ip 000055dfe7cc7e25 sp 00007ffd799d7d38 error 4 in php-fpm[55dfe7a89000+3a7000]

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