keepalived 双主+haproxy高可用
Keepalived的作用是检测web服务器的状态，如果有故障，自动将其剔除，人工修复好后，自动将其添加到服务器组。haproxy提供高可用性、负载均衡以及基于TCP和HTTP应用的代 理，支持虚拟主机，它是免费、快速并且可靠的一种解决方案。出现单点故障，使服务转移到其他节点上，保障服务不受影响。
下面是两项功能的结合，排版很有乱，看官忍耐
172.16.15.17 keepalived+haproxy
172.16.15.13 keepalived+haproxy
172.16.15.11 index.html
172.16.15.12 inidex.php
配置172.16.15.17上keepalived
yum install keepalived
global_defs {
notification_email {
root@localhost
}
notification_email_from linux@keep.com
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id LVS_DEVEL
}
vrrp_script chk_haproxy {
script "killall -0 haproxy"
interval 1
weight 2
}
vrrp_instance VI_1 {
state MASTER
interface eth0
virtual_router_id 50
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
172.16.15.5
}
track_script {
chk_haproxy
}
notify_master "/etc/keepalived/notify.sh master"
notify_backup "/etc/keepalived/notify.sh backup"
notify_fault "/etc/keepalived/notify.sh fault"
vrrp_instance VI_2 {
state BACKUP
interface eth0
virtual_router_id 55
priority 99
advert_int 1
authentication {
auth_type PASS
auth_pass 2111
}
virtual_ipaddress {
172.16.15.15
}
track_script {
chk_haproxy
}
}
为keepalived提供脚本文件
#vim /etc/keepalived/notify.sh
#!/bin/bash
# Author: MageEdu <linuxedu@foxmail.com>
# description: An example of notify script
#
vip=172.16.15.5
contact='root@localhost'
notify() {
mailsubject="`hostname` to be $1: $vip floating"
mailbody="`date '+%F %H:%M:%S'`: vrrp transition, `hostname` changed to be $1"
echo $mailbody | mail -s "$mailsubject" $contact
}
case "$1" in
master)
notify master
/etc/rc.d/init.d/haproxy start
exit 0
;;
backup)
notify backup
/etc/rc.d/init.d/haproxy stop
exit 0
;;
fault)
notify fault
/etc/rc.d/init.d/haproxy stop
exit 0
;;
*)
echo 'Usage: `basename $0` {master|backup|fault}'
exit 1
;;
esac
配置172.16.15.13上keepalived
# yum install -y keepalived
! Configuration File for keepalived
global_defs {
notification_email {
root@localhost
}
notification_email_from linux@keep.com
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id LVS_DEVEL
}
vrrp_script chk_haproxy {
script "killall -0 haproxy"
interval 1
weight 2
}
vrrp_instance VI_1 {
state BACKUP
interface eth0
virtual_router_id 50
priority 99
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
172.16.15.5
}
track_script {
chk_haproxy
}
}
vrrp_instance VI_2 {
state MASTER
interface eth0
virtual_router_id 55
priority
advert_int 1
authentication {
auth_type PASS
auth_pass 2111
}
virtual_ipaddress {
172.16.15.15
}
track_script {
chk_haproxy
}
notify_master "/etc/keepalived/notify.sh master"
notify_backup "/etc/keepalived/notify.sh backup"
notify_fault "/etc/keepalived/notify.sh fault"
}
脚本文件和172.16.15.17一样 只需将vip改为172.16.15.15
配置172.16.15.17上haproxy
# yum install haproxy -y
# vim /etc/haproxy/haproxy.cfg
global
log 127.0.0.1 local2
chroot /var/lib/haproxy
pidfile /var/run/haproxy.pid
maxconn 4000
user haproxy
group haproxy
daemon
stats socket /var/lib/haproxy/stats
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 proxy *:80
acl url_static path_beg -i /static /images /javascript /stylesheets
acl url_static path_end -i .jpg .gif .png .css .js .html
acl host_static hdr_beg(host) -i img. video. down. ftp. imgs. image. videos.
acl url_php path_end -i .php
use_backend static if url_static or host_static
use_backend dynamic if url_php
default_backend dynamic
backend static
balance roundrobin
server node1 172.16.15.11:80 check
backend dynamic
balance roundrobin
servernode2172.16.15.12:80check
listen statistics
bind *:4454
stats enable
stats auth admin:admin
172.16.15.13 配置hapeoxy的过程一样
测试keepalived和haproxy都启动，两个流动ip分别在172.16.15.17和172.16.15.13上
将172.16.15.17的haproxy宕掉keepalived双主模式完成
后端配置172.16.15.11 提供测试网页文件 echo "<h1>node=1</h1>" >> /var/www/html/index.html 如果是Nginx 要在/etc/nginx/nginx.confroot后指定路径
location / { root/var/www/html; indexindex.html index.htm; }172.16.15.12 提供php测试页面yum install php php-mysql
启动服务，检测效果
haproxy代理也实现高可用
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