实现高可用WordPress部署
1 概述
本文通过HAProxy,Keepalive,实现动静分离wordpress,在每台haproxy和wordpress服务器之间加入缓存，通过缓存实现加速。具体需求如下
.(1)动静分离部署wordpress，动静都要能实现负载均衡
.(2)在haproxy和后端主机之间添加varnish进行缓存
.(3) haproxy的设定要求：动静分离
.(4) haproxy高可用
.(5)通过VIP：172.18.50.80来访问wordpress
前提
1：node1 ip是172.18.50.62，node2 ip 是172.18.50.63.写入/etc/hosts文件里，node1和node2实现基于ssh-key的验证。
2：所有主机时间同步。
拓扑图如下
2 配置
172.18.50.62 HAproxy配置,主备配置一样，172.18.50.63不附上代码
global
log 127.0.0.1 local2
chroot /var/lib/haproxy
pidfile /var/run/haproxy.pid
maxconn 4000
user haproxy
group haproxy
daemon
# turn on stats unix socket
stats socket /var/lib/haproxy/stats
#---------------------------------------------------------------------
# common defaults that all the 'listen' and 'backend' sections will
# use if not designated in their block
#---------------------------------------------------------------------
defaults
mode http
log global
option httplog
option dontlognull
option http-server-close
option forwardfor except 127.0.0.0/8
option redispatch
retries 3
timeout http-request 10s
timeout queue 1m
timeout connect 10s
timeout client 1m
timeout server 1m
timeout http-keep-alive 10s
timeout check 10s
maxconn 3000
frontend http
bind *:80
acl url_dyn path_end -i .php
acl url_stac path_end -i .jpg .gif .png .css .js .html .txt .ico .svg
reqadd sunny-x-via:\ haproxy6b
default_backend dynamicblog if url_dyn
use_backend staticblog if url_stac
option forwardfor header sunny-x-client
rspdel Server
rspadd Server:\ Sunny-proxy6b
backend staticblog
balance roundrobin
cookie WEBSRV insert nocache
server varnish7b 172.18.50.72:80 check weight 1 inter 3000 rise 2 fall 2 cookie cksrv1
backend dynamicblog
balance roundrobin
cookie WEBSRV insert nocache
server varnish7c 172.18.50.73:80 check weight 1 inter 3000 rise 2 fall 2 cookie cksrv2
listen stats
bind :9091
stats enable
stats auth admin:admin
stats admin if TRUE
172.18.50.62 HAproxy配置,主备配置有区别，区别在于四点：
notification_email_from node2@localhost
router_id node2
state BACKUP
priority 90
172.18.50.63不附上代码。
! Configuration File for keepalived
global_defs {
notification_email {
root@localhost
}
notification_email_from node1@localhost
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id node1
vrrp_mcast_group4 224.0.100.100
}
vrrp_script chk_down {
script "[[ -f /etc/keepalived/down ]] && exit 1 || exit 0"
interval 1
weight -20
}
vrrp_script chk_haproxy {
script "killall -0 haproxy && exit 0 || exit 1"
interval 1
weight -20
fall 2
rise 1
}
vrrp_instance VI_1 {
state MASTER
interface eth1
virtual_router_id 50
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass sunny
}
virtual_ipaddress {
172.18.50.80
}
notify_master "/etc/keepalived/vip1_notify.sh master"
notify_backup "/etc/keepalived/vip1_notify.sh backup"
notify_fault "/etc/keepalived/vip1_notify.sh fault"
track_script {
chk_down
chk_haproxy
}
}
172.18.50.62 HAproxy配置里notify.sh脚本如下
#!/bin/bash
contact='root@localhost'
notify() {
mailsubject="$(hostname) to be $1, vip
floating"
mailbody="$(date +'%F %T'): vrrp transition,
$(hostname) changed to be $1"
echo "$mailbody" | mail -s
"$mailsubject" $contact
}
case $1 in
master)
notify master
;;
backup)
notify backup
;;
fault)
notify fault
;;
*)
echo "Usage: $(basename $0)
{master|backup|fault}"
exit 1
;;
esac
172.18.50.73 varnish配置default.vcl如下，172.18.50.72配置区别如下
backend static {
.host = "172.18.50.65";
.port = "80";
.probe = check;
}
其他配置一样，172.18.50.72这里就附上脚本
vcl 4.0;
probe check {
.url = "/index.html";
.window = 5;
.threshold = 4;
.interval = 2s;
.timeout = 1s;
}
backend dynamic {
.host = "172.18.50.75";
.port = "80";
.probe = check;
}
sub vcl_recv {
if (req.restarts == 0){
if (req.http.X-Forwarded-For){
set req.http.X-Forwarded-For = req.http.X-Forwarded-For + "," + client.ip;
} else {
set req.http.X.Forwarded-For = client.ip;
}
}
}
sub vcl_backend_response {
if (beresp.http.cache-control !~ "s-maxage") {
if (bereq.url ~ "(?i)\.(jpg|jpeg|png|gif|css|js|xml)$") {
unset beresp.http.Set-Cookie;
set beresp.ttl = 3600s;
}
}
if (bereq.url ~ "(?i).*php.*") {
unset beresp.http.Set-Cookie;
set beresp.ttl = 3600s;
}
}
sub vcl_deliver {
if (obj.hits>0) {
set resp.http.X-Cache = "Hit via " + server.ip;
} else {
set resp.http.X-Cache = "Miss from " + server.ip;
}
}
后端的172.18.50.65和172.18.50.75这两台wordpress都要安装wordpress和http,同时172.18.50.75是处理动态资源的脚本，所以还需要安装php-fpm.同时在75这台安装mysql.这里就不演示了，相关部署见http://ghbsunny.blog.51cto.com/7759574/1970716文章。j
到这里部署就完成了。可以通过网页访问http://172.18.50.80/blog查看功能是否正常。其中，这里的blog是将wordpress安装包部署后重命名为blog，可根据实际情况自行设定。
