nginx + keepalived 实现高可靠web网站

组网图：

配置信息：

左边nigx 服务器的 /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;

server {

listen       80;

server_name  192.168.248.200;

#charset koi8-r;

#access_log  logs/host.access.log  main;

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;

#    }

#}

}

右边的nginx 服务器的配置文件 /usr/loca/nginx/conf/nginx.conf内容如下：

#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;

server {

listen       80;

server_name  192.168.248.200;

#charset koi8-r;

#access_log  logs/host.access.log  main;

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;

#    }

#}

}

左边nginx服务器的默认 html文件内容为： ( /usr/local/nginx/html/index.html)

I am nginx master

右边nginx服务器的默认html文件内容为：（路径同上）

I am nginx-slave

左边nginx服务器的keepalived配置文件为：( /etc/keepalived/keepalived.conf)

global_defs {

router_id NodeA

}

vrrp_instance VI_1 {

state MASTER    #设置为主服务器

interface ens33  #监测网络接口

virtual_router_id 51  #主、备必须一样

priority 100   #(主、备机取不同的优先级，主机值较大，备份机值较小,值越大优先级越高)

advert_int 1   #VRRP Multicast广播周期秒数

authentication {

auth_type PASS  #VRRP认证方式，主备必须一致

auth_pass 1111   #(密码)

}

virtual_ipaddress {

192.168.248.200

}

右边nginx服务器的keepalived配置文件内容如下：

global_defs {

router_id NodeB

}

vrrp_instance VI_1 {

state BACKUP    #设置为主服务器

interface ens33  #监测网络接口

virtual_router_id 51  #主、备必须一样

priority 90   #(主、备机取不同的优先级，主机值较大，备份机值较小,值越大优先级越高)

advert_int 1   #VRRP Multicast广播周期秒数

authentication {

auth_type PASS  #VRRP认证方式，主备必须一致

auth_pass 1111   #(密码)

}

virtual_ipaddress {

192.168.248.200

}

启动nginx服务器和配置防火墙

#/usr/local/nginx/sbin/nginx

#firewall-cmd --permanent --add-port=80/tcp

#firewall-cmd --reload

实际测试结果如下：

关闭左边的nginx的ens33端口后，造成nginx备生主，