实现双主模型的ngnix高可用(一)
准备：主机7台
client:
172.18.x.x
调度器：keepalived+nginx 带172.18.x.x/16 网卡
192.168.234.27
192.168.234.37
real_server
192.168.234.47
192.168.234.57
192.168.234.67
192.168.234.77
实验结果
1 [root@234c17 ~]# for i in {1..4};do curl www.a.com;curl www.b.com;sleep 1;done 2 234.57 3 234.77 4 234.47 5 234.67 6 234.57 7 234.77 8 234.47 9 234.67
过程：
一、先配置4台real_server，安装好测试用的httpd
1 [root@234c47 ~]# curl 192.168.234.47;curl 192.168.234.57;curl 192.168.234.67;curl 192.168.234.77 2 234.47 3 234.57 4 234.67 5 234.77
二、配置keepalived
因为是双主模型
1.配置keepalived主机234.27
[root@234c27 ~]# vim /etc/keepalived/keepalived.conf ! Configuration File for keepalived global_defs { notification_email { root@localhost } notification_email_from keepalived@localhost smtp_server 127.0.0.1 smtp_connect_timeout 30 router_id kpone vrrp _mcast_group4 234.10.10.10 } vrrp_instance VI_1 { state MASTER interface ens33 virtual_router_id 50 priority 100 advert_int 1 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 172.18.0.100/16 //这ip调度 192.168.234.47/57 } } vrrp_instance VI_2 { state BACKUP interface ens33 virtual_router_id 51 priority 80 advert_int 1 authentication { auth_type PASS auth_pass 2222 } virtual_ipaddress { 172.18.0.200/16 //这ip调度 192.168.234.147/157 } }
2.配置keepalived主机234.37
[root@234c37 ~]# vim /etc/keepalived/keepalived.conf ! Configuration File for keepalived global_defs { notification_email { root@localhost } notification_email_from keepalived@localhost smtp_server 127.0.0.1 smtp_connect_timeout 30 router_id kpone vrrp _mcast_group4 234.10.10.10 } vrrp_instance VI_1 { state BACKUP interface ens33 virtual_router_id 50 priority 80 advert_int 1 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 172.18.0.100/16 //这ip调度 192.168.234.47/57 } } vrrp_instance VI_2 { state MASTER interface ens33 virtual_router_id 51 priority 100 advert_int 1 authentication { auth_type PASS auth_pass 2222 } virtual_ipaddress { 172.18.0.200/16 //这ip调度 192.168.234.147/157 } }
这样双主模型简单的就搭建好了
3.配置nginx主机234.27/37
先配置http语块
http {
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 /var/log/nginx/access.log main;
upstream web1{ //
server 192.168.234.47:80;
server 192.168.234.57:80;
}
upstream web2{
server 192.168.234.67:80;
server 192.168.234.77:80;
}
/*
ngx_http_upstream_module
ngx_http_upstream_module模块
用于将多个服务器定义成服务器组，而由proxy_pass, fastcgi_pass等指令
进行引用
1、upstream name { ... }
定义后端服务器组，会引入一个新的上下文
默认调度算法是wrr
Context: http
upstream httpdsrvs {
server ...
server...
...
*/然后配置server
server {
listen 80 default_server; //默认监听80端口
server_name www.a.com //域名
listen [::]:80 default_server;
root /usr/share/nginx/html;
# Load configuration files for the default server block.
include /etc/nginx/default.d/*.conf;
location / {
proxy_pass http://web1 ; //定义访问80端口的请求，以web1提供服务。而指定的web1在http语块中为 192.168.234.47/57:80 提供服务
}
error_page 404 /404.html;
location = /40x.html {
}
error_page 500 502 503 504 /50x.html;
location = /50x.html {
}
}
server {
server_name www.b.com
listen 80;
location / {
proxy_pass http://web2 ; //定义访问80端口的请求，以web2提供服务。而指定的web2在http语块中为 192.168.234.147/157:80 提供服务
}
}
}这样访问 www.a.com就是访问192.168.234.47/57:80
访问 www.b.com就是访问192.168.234.67/77:80
现在客户机将host添加www.a/b.com
172.18.0.100 www.a.com
172.18.0.200 www.b.com
客户端将www.a.com 解析 172.18.0.100
[root@234c17 ~]# ping www.a.com PING www.a.com (172.18.0.100) 56(84) bytes of data. 64 bytes from www.a.com (172.18.0.100): icmp_seq=1 ttl=64 time=0.358 ms 64 bytes from www.a.com (172.18.0.100): icmp_seq=2 ttl=64 time=0.376 ms 64 bytes from www.a.com (172.18.0.100): icmp_seq=3 ttl=64 time=0.358 ms 64 bytes from www.a.com (172.18.0.100): icmp_seq=4 ttl=64 time=0.366 ms
客户端将www.b.com 解析 172.18.0.200
[root@234c17 ~]# ping www.b.com PING www.b.com (172.18.0.200) 56(84) bytes of data. 64 bytes from www.b.com (172.18.0.200): icmp_seq=1 ttl=64 time=0.582 ms 64 bytes from www.b.com (172.18.0.200): icmp_seq=2 ttl=64 time=0.339 ms 64 bytes from www.b.com (172.18.0.200): icmp_seq=3 ttl=64 time=0.524 ms 64 bytes from www.b.com (172.18.0.200): icmp_seq=4 ttl=64 time=0.337 ms
结果：
1 [root@234c17 ~]# for i in {1..4};do curl www.a.com;curl www.b.com;sleep 1;done 2 234.57 3 234.77 4 234.47 5 234.67 6 234.57 7 234.77 8 234.47 9 234.67
实现双主模型的ngnix高可用(二)
现在扩展实验
将192.168.234.47/57主机加ip地址
[root@234c47 ~]#ip a a dev ens37 192.168.167/24
[root@234c57 ~]#ip a a dev ens37 192.168.177/24
编辑http的的配置文件增加基于FQDN虚拟主机
[root@234c47 ~]# vim /etc/httpd/conf.d/vhost.conf <virtualhost 192.168.234.167:80> documentroot /data/web1 servername www.a.com < directory /data/web1> require all granted < /directory> < /virtualhost>
另一个主机也加上虚拟主机
[root@234c57 ~]# vim /etc/httpd/conf.d/vhost.conf <virtualhost 192.168.234.177:80> documentroot /data/web1 servername www.a.com <directory /data/web1> require all granted < /directory> < /virtualhost>
重启httpd服务
结果：访问www.a.com
1 [root@234c17 ~]# for i in {1..8};do curl www.a.com;done 2 234.167 3 234.177 4 234.47 5 234.57 6 234.167 7 234.167 8 234.177 9 234.47 10
1 [root@234c17 ~]# for i in {1..8};do curl www.b.com;done 2 234.67 3 234.67 4 234.77 5 234.67 6 234.77 7 234.67 8 234.77 9 234.77