keepalived+nginx后端服务器access_log出现127.0.0.1的访问记录

前几天闲着无聊搭了一个keepalived+nginx的高可用架构

[root@backup ~]# cat /usr/local/nginx/conf/nginx.conf

#user nobody;
worker_processes 1;

#error_log logs/error.log;
#error_log logs/error.log notice;
#error_log logs/error.log info;

#pid logs/nginx.pid;

events {
worker_connections 1024;
}

http {
include mime.types;
default_type application/octet-stream;

#log_format main '$remote_addr - $remote_user [$time_local] "$request" '
# '$status $body_bytes_sent "$http_referer" '
# '"$http_user_agent" "$http_x_forwarded_for"';

#access_log logs/access.log main;

sendfile on;
#tcp_nopush on;

#keepalive_timeout 0;
keepalive_timeout 65;

#gzip on;
upstream websrc {
server 10.1.1.30 weight=1 max_fails=2 fail_timeout=2;
server 10.1.1.40 weight=1 max_fails=2 fail_timeout=2;
}
server {
listen 80;
server_name localhost;

#charset koi8-r;

#access_log logs/host.access.log main;
location / {
root html;
index index.html index.htm;
proxy_pass http://websrc;
proxy_set_header x-real-ip $remote_addr;
}
# location / {
# root html;
# index index.html index.htm;
# }

#error_page 404 /404.html;

# redirect server error pages to the static page /50x.html
#
error_page 500 502 503 504 /50x.html;
location = /50x.html {
root html;
}

# proxy the PHP scripts to Apache listening on 127.0.0.1:80
#
#location ~ .php$ {
# proxy_pass http://127.0.0.1;
#}

# pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
#
#location ~ .php$ {
# root html;
# fastcgi_pass 127.0.0.1:9000;
# fastcgi_index index.php;
# fastcgi_param SCRIPT_FILENAME /scripts$fastcgi_script_name;
# include fastcgi_params;
#}

# deny access to .htaccess files, if Apache's document root
# concurs with nginx's one
#
#location ~ /.ht {
# deny all;
#}
}

# another virtual host using mix of IP-, name-, and port-based configuration
#
#server {
# listen 8000;
# listen somename:8080;
# server_name somename alias another.alias;

# location / {
# root html;
# index index.html index.htm;
# }
#}

# HTTPS server
#
#server {
# listen 443 ssl;
# server_name localhost;

# ssl_certificate cert.pem;
# ssl_certificate_key cert.key;

# ssl_session_cache shared:SSL:1m;
# ssl_session_timeout 5m;

# ssl_ciphers HIGH:!aNULL:!MD5;
# ssl_prefer_server_ciphers on;

# location / {
# root html;
# index index.html index.htm;
# }
#}

}

为了防止出现脑裂的问题我写了一个脚本，当nginx服务故障时，keepalived服务关闭。

脚本

#!/bin/bash
#/usr/bin/curl -I http://10.1.1.20 &>/dev/null

/usr/bin/curl -I http://localhost
if [ $? -ne 0 ];then
/etc/init.d/keepalived stop
fi

由于此脚本的原因，导致我高可用nginx代理到后端真是服务器时出现了127.0.0.1的访问记录，而且很频繁，在一定成都上降低了服务器的性能。

后来发现是这个脚本的问题，虽然其解决了脑裂，但是由于做了代理功能，因此在keepalived做心跳检查时会不断地调用此脚本，所以导致了后端服务器的访问日志出现了127的访问记录。

后来改善脚本为查看nginx服务状态，解决了此问题