Nginxproxy+varnish
Nginx负载均衡它可基于四层和七层之间进行调度，而且对后端各个节点具有健康状态检测的功能，当后端服务器故障时，会自动标记为不可用状态，当后端节点上线时再将请求调度至此节点，配合keepalived利用飘移IP，高可用保证调度器的实时在线。为保证热区数据的快速响应配合varnish缓存加速,并实现动静分离。
案例架构拓扑如下：
拓扑环境如下:
前端：Nginx+keepalived高可用
调度服务器：Varnish1、Varnish2
缓存服务器：Varnish
1、VarnishServer两台
2、动静分离后端服务器，并动静都提供负载均衡效果
后端服务器：
NginxStaticWebServer+NFS-client
AMP DynamicWebServer+NFS-server
1.安装nginx和keepalived后做keepalived配置如下：
! Configuration File for keepalived
global_defs {
notification_email {
[email protected]
}
notification_email_from [email protected]
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id node2
vrrp_mcast_group4 224.0.234.123
}
vrrp_script chk_down {
script "[[ -f /etc/keepalived/down ]] && exit 1 || exit 0"
interval 1
weight -5
}
vrrp_script chk_nginx {
script "pkill -0 nginx && exit 0 || exit 1"
interval 1
weight -5
fall 2
rise 1
}
vrrp_instance VI_1 {
state MASTER
interface eth0
virtual_router_id 36
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 335566
}
virtual_ipaddress {
192.168.1.98/24 dev eth0
}
track_script {
chk_down
chk_nginx
}
}
vrrp_instance VI_2 {
state BACKUP
interface eth0
virtual_router_id 37
priority 99
advert_int 1
authentication {
auth_type PASS
auth_pass 33556677
}
virtual_ipaddress {
192.168.1.99/24 dev eth0
}
track_script {
chk_down
chk_nginx
}
}
#notify_master "/etc/keepalived/notify.sh master" #notify_backup "/etc/keepalived/notify.sh backup"
#notify_fault "/etc/keepalived/nofify.sh fault"
}
- Nginx负载均衡简单配置如下：
user nginx;
worker_processes 1;
error_log /var/log/nginx/error.log warn;
pid /var/run/nginx.pid;
events {
worker_connections 1024;
}
stream {
upstream nasrvs {
server 192.168.5.107:80;
server 192.168.5.108:80;
}
server {
listen 80;
proxy_pass nasrvs;
proxy_timeout 60s;
proxy_connect_timeout 10s;
}
}
另一台Nginx负载均衡及keepalived基本配置相同更改相应的参数即可。
3.后端Varnish-server配置如下：
vcl 4.0;
# Default backend definition. Set this to point to your content server.
backend default {
.host = "192.168.20.109";
.port = "80";
}
backend nginxsrvs {
.host = "192.168.20.108";
.port = "80";
}
sub vcl_recv {
# Happens before we check if we have this in cache already.
#
# Typically you clean up the request here, removing cookies you don‘t need,
# rewriting the request, etc.
if (req.method == "PURGE") {
return(purge);
}
if (req.url ~ "(?i)\.(css|svg|js|jpg|jpeg|png|gif|pdf)") {
set req.backend_hint = nginxsrvs;
} else {
set req.backend_hint = default;
}
}
sub vcl_purge {
return (synth(200,"Purged"));
}
sub vcl_deliver {
if (obj.hits>0) {
set resp.http.X-Cache = "HIT via " + server.ip;
} else {
set resp.http.X-Cache = "Miss via " + server.ip;
}
两台varnishserver的配置基本一致，更改相应的参数即可。
4.AMP将httpd，mariadb-server，php-mysql,php安装后httpd的配置如下：
<VirtualHost *:80> DirectoryIndex index.php index.html ServerName www.abc.com DocumentRoot /apps/data/wordpress <Directory "/apps/data/"> Options FollowSymLinks AllowOverride None Require all granted </Directory> </VirtualHost>
5.创建/apps/data目录后将wordpress的程序文件解压缩至此目录在mariadb中创建库及账号，此前文章有介绍到wordpress的部署方法。并配置nfs编辑/etc/exports文件如下：
/apps/data *(rw,all_squash,anonuid=48)
执行exportfs -ar导出所有目录
6.配置Nginx static web server配置如下：
server {
listen 80;
server_name www.abc.com;
location / {
root /apps/data/wordpress;
index index.html index.htm;
}
error_page 500 502 503 504 /50x.html;
location = /50x.html {
root /usr/share/nginx/html;
}
#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;
#}
}
7.NFS-client的配置将NFS-server的导出目录挂载至/apps/data编辑/etc/fstab：
192.168.20.109:/apps/data /apps/data nfs rw,defaults 0 0
整个配置完成做一下测试访问：
以上内容还有待完善。
