linux主机内存告警shell脚本

我会带着你远行 2023-03-14 05:53 3阅读 0赞

#!/bin/sh
    
    ramusage=$(free | awk '/Mem/{printf("RAM Usage: %.2f\n"), $3/$2*100}'| awk '{print $3}')
    
    if [ "$ramusage" > 20 ]; then
      SUBJECT="ATTENTION: Memory Utilization is High on $(hostname) at $(date)"
      MESSAGE="/tmp/Mail.out"
      TO="158497182@qq.com"
      echo "Memory Current Usage is: $ramusage%" >> $MESSAGE
      echo "" >> $MESSAGE
      echo "------------------------------------------------------------------" >> $MESSAGE
      echo "Top Memory Consuming Process Using top command" >> $MESSAGE
      echo "------------------------------------------------------------------" >> $MESSAGE
      echo "$(top -b -o +%MEM | head -n 20)" >> $MESSAGE
      echo "" >> $MESSAGE
      echo "------------------------------------------------------------------" >> $MESSAGE
      echo "Top Memory Consuming Process Using ps command" >> $MESSAGE
      echo "------------------------------------------------------------------" >> $MESSAGE
      echo "$(ps -eo pid,ppid,%mem,%Memory,cmd --sort=-%mem | head)" >> $MESSAGE
      mail -s "$SUBJECT" "$TO" < $MESSAGE
      rm /tmp/Mail.out
    fi
    
    # crontab -e
    # */5 * * * * /bin/bash /root/memory-alert.sh
    
    # /usr/bin/free | awk '/Mem/{printf("RAM Usage: %.2f%\n"), $3/$2*100}' |  awk '{print $3}' | awk '{ if($1 > 20) print $0;}' | mail -s "High Memory Alert" 158497182@qq.com

测试代码：

报错如下：

send-mail: fatal: parameter inet_interfaces: no local interface found for ::1

![20200516123558927.png][]解决方法：

vim /etc/postfix/main.cf
    设置
    inet_interfaces = all

重启

service postfix restart

如果重启报一下错误

Job for postfix.service failed because the control process exited with error code. See "systemctl status postfix.service" and "journalctl -xe" for details.

![20200516123624137.png][]解决方法：

vim /etc/postfix/main.cf
    
    inet_protocols = ipv4  
    inet_interfaces = all

[20200516123558927.png]: /images/20230312/c815d682a8564625854cdd14f4b54a50.png
[20200516123624137.png]: /images/20230312/4e77b014e3804504876b4f481c6a01ed.png