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Ê×ÏÈ£¬ÎÒÃÇÐèҪѡÔñÒ»¸öºÏÊʵĸºÔØƽºâÆ÷Èí¼þ ¡£ÔÚLinuxÉϳ£ÓõĸºÔØƽºâÆ÷Èí¼þÓÐNginx¡¢HAProxyºÍKeepalivedµÈ ¡£ÔÚ±¾ÎÄÖУ¬ÎÒÃǽ«ÒÔKeepalivedΪÀý¾ÙÐÐÉèÖà ¡£

ʹÓÃÒÔÏÂÏÂÁîÔÚLinuxÉÏ×°ÖÃKeepalived£º

$ sudo apt-get install keepalived

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×°ÖÃÍê³Éºó£¬ÎÒÃÇÐèÒªÉèÖÃKeepalivedÒÔÆôÓø߿ÉÓÃÐÔ ¡£ÔÚ/etc/keepalived/Ŀ¼Ï½¨ÉèÒ»¸öÃûΪkeepalived.confµÄÎļþ£¬²¢½«ÒÔÏÂÉèÖÃÄÚÈÝÌí¼Óµ½ÎļþÖУº

# Ö»ÔÚÖ÷½ÚµãÉÏÔËÐÐ
vrrp_script check_http {
        script "/usr/local/bin/check_http.sh"
        interval 2
}
vrrp_instance VI_1 {
        state MASTER
        virtual_router_id 51
        priority 100
        advert_int 1
        authentication {
                auth_type PASS
                auth_pass example
        }
        virtual_ipaddress {
                10.0.0.1/24
        }
        track_script {
                check_http
        }
}

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ÆäÖУ¬check_http.shÊÇÒ»¸ö×Ô½ç˵µÄ¾ç±¾£¬ÓÃÓÚ¼ì²é¸ºÔØƽºâÆ÷ËùÔڵĺó¶ËЧÀÍÆ÷µÄ¿ÉÓÃÐÔ ¡£¾ç±¾¿ÉÒÔƾ֤ÏÖʵÐèÇó±àд ¡£

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Íê³ÉKeepalivedµÄÉèÖúó£¬ÎÒÃÇ¿ÉÒÔʹÓÃÆäËû¹¤¾ß¼à¿Ø¸ºÔØƽºâÆ÷µÄÔËÐÐ״̬ ¡£ÔÚ±¾ÎÄÖУ¬ÎÒÃǽ«Ê¹ÓÃÒ»¸ö¼òÆÓµÄPython½ÅÔ­À´¼à¿Ø¸ºÔØƽºâÆ÷µÄ¿ÉÓÃÐÔ ¡£

Ê×ÏÈ£¬ÎÒÃÇÐèҪװÖÃPythonµÄrequestsÄ£¿é£º

$ sudo pip install requests

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È»ºó£¬½¨ÉèÒ»¸öÃûΪcheck_lb.pyµÄPython¾ç±¾£¬²¢½«ÒÔÏ´úÂëÌí¼Óµ½ÎļþÖУº

import requests

def check_lb():
    try:
        response = requests.get('http://10.0.0.1')
        if response.status_code == 200:
            print('¸ºÔØƽºâÆ÷Õý³£ÔËÐÐ')
        else:
            print('¸ºÔØƽºâÆ÷¹ÊÕÏ')
    except requests.exceptions.RequestException as e:
        print('¸ºÔØƽºâÆ÷¹ÊÕÏ')

if __name__ == '__main__':
    check_lb()

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ÔÚÉÏÃæµÄ´úÂëÖУ¬ÎÒÃÇʹÓÃrequests¿âÀ´·¢ËÍHTTPÇëÇó²¢¼ì²é·µ»ØµÄ״̬Âë ¡£ÈôÊÇ״̬ÂëΪ200£¬ÔòÌåÏÖ¸ºÔØƽºâÆ÷Õý³£ÔËÐÐ £»²»È»£¬ÌåÏÖ¸ºÔØƽºâÆ÷¹ÊÕÏ ¡£

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$ crontab -e

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*/5 * * * * /usr/bin/python /path/to/check_lb.py

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ÉÏÃæµÄÉèÖý«Ã¿¸ô5·ÖÖÓÔËÐÐÒ»´Î¼à¿Ø¾ç±¾ ¡£¿ÉÒÔƾ֤ÏÖʵÐèÇóÐÞ¸ÄÕâ¸öʱ¼ä¾àÀë ¡£

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ÔÚ¼à¿Ø¾ç±¾ÖУ¬ÎÒÃÇ¿ÉÒÔÐÞ¸Ächeck_lb()º¯Êý£¬Ìí¼Ó±¨¾¯Âß¼­ ¡£ÀýÈ磬µ±¸ºÔØƽºâÆ÷¹ÊÕÏʱ·¢Ë͵ç×ÓÓʼþ»ò·¢ËÍÐÂÎŵ½ÊÖ»úÓ¦ÓóÌÐò ¡£

ÒÔÏÂÊÇÒ»¸ö¼òÆÓµÄʾÀý£¬·¢Ë͵ç×ÓÓʼþµÄ´úÂëƬ¶Ï£º

import smtplib
from email.mime.text import MIMEText

def send_email():
    sender = 'your_email@example.com'
    receiver = 'recipient@example.com'
    subject = '¸ºÔØƽºâÆ÷¹ÊÕÏ'
    message = '¸ºÔØƽºâÆ÷ÎÞ·¨»á¼û'

    msg = MIMEText(message)
    msg['Subject'] = subject
    msg['From'] = sender
    msg['To'] = receiver

    try:
        smtp_obj = smtplib.SMTP('localhost')
        smtp_obj.sendmail(sender, receiver, msg.as_string())
        smtp_obj.quit()
        print('ÓʼþÒÑ·¢ËÍ')
    except smtplib.SMTPException:
        print('Óʼþ·¢ËÍʧ°Ü')

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ÔÚcheck_lb()º¯ÊýÖУ¬µ±¸ºÔØƽºâÆ÷¹ÊÕÏʱ£¬¿ÉÒÔŲÓÃsend_email()º¯Êý·¢Ëͱ¨¾¯Óʼþ ¡£

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