haproxy+keepalived搭建-白红宇

haproxy+keepalived搭建

阅读量：6845 次

发布时间：2019-06-26

本文共 8236 字，大约阅读时间需要 27 分钟。

1、介绍：

【HAProxy】是高性能的代理服务器，其可以提供7层和4层代理，具有healthcheck，负载均衡等多种特性，性能卓越

【KeepAlived】是一个高可用方案，通过VIP(即虚拟IP)和心跳检测来实现高可用，也通过该vip实现访问。其原理是存在一组（两台）服务器

默认情况下Master会绑定VIP到自己的网卡上，对外提供服务。如果Backup发现Master宕机，那么Backup会发送ARP包到网关，把VIP绑定到自己的网卡，此时Backup对外提供服务，实现自动化的故障转移，当Master恢复的时候会重新接管服务。

2、环境：

web1:192.168.1.78

web2:192.168.1.241

web3:192.168.1.133

web4:192.168.1.244

haproxy+keepalived1:192.168.1.22

haproxy+keepalived1:192.168.1.9

vip1:192.168.1.189（www.inbank.com）

vip2:192.168.1.199(p_w_picpath.inbank.com)

3、需求：

默认情况下，第一台负载均衡器主要分发www.baison.com.cn的请求，第二台负载均衡器主要分发img.baison.com.cn的请求。任意一台宕机都不会影响网站分发。这样不会导致服务器浪费。

4、keepavlied+haproxy安装略，直接进入haproxy和keepalived配置

【192.168.1.22】上的haproxy配置：

[root@master etc]# cat /usr/local/haproxy/etc/haproxy.cfg |grep -v "#"|sed '/^$/d'

global

log 127.0.0.1 local1 notice

maxconn 4096

chroot /usr/share/haproxy

uid 99

gid 99

daemon

pidfile /usr/local/haproxy/haproxy.pid

defaults

log global

mode http

retries 3

maxconn 2000

contimeout 5000

clitimeout 50000

srvtimeout 50000

stats uri /haproxy-stats

balance roundrobin

frontend WEB_SITE

bind :80

acl web hdr(host) -i www.inbank.com

acl img hdr(host) -i p_w_picpath.inbank.com

use_backend webserver if web

use_backend imgserver if img

backend webserver

mode http

balance roundrobin

server web_1 192.168.1.78:80 check inter 2000 fall 5 weight 1

server web_2 192.168.1.241:80 check inter 2000 fall 5 weight 1

backend imgserver

mode http

option httpchk /index.php

balance roundrobin

server web_1 192.168.1.133:80 check inter 2000 fall 5 weight 1

server web_1 192.168.1.244:80 check inter 2000 fall 5 weight 1

192.168.1.22上的keepalived配置

[root@master keepalived]# cat keepalived.conf|grep -v "#"|sed '/^$/d'

!Configuration File for keepalived

global_defs {

router_id LVS_DEVEL

}

vrrp_script chk_haproxy {

script "/usr/local/keepalived/check_haproxy.sh"

interval 2

weight 2

}

vrrp_instance VI_1 {

state MASTER

interface eth0

virtual_router_id 88

priority 100

advert_int 1

authentication {

auth_type PASS

auth_pass 5555

}

track_script {

chk_haproxy

}

virtual_ipaddress {

192.168.1.189

}

vrrp_instance VI_2 {

state BACKUP

interface eth0

virtual_router_id 89 ---#id不能跟VI_1一样

priority 99---#

advert_int 1

authentication {

auth_type PASS

auth_pass 1111

}

virtual_ipaddress {

192.168.1.199

}

检测脚本，为了防止haproxy服务关闭导致keepalived不自动切换。

#vim /usr/local/keepalived/check_haproxy.sh

#!/bin/bash

if [ $(ps -C haproxy --no-header | wc -l) -eq 0 ]; then

/usr/local/haproxy/sbin/haproxy -f /usr/local/haproxy/etc/haproxy.cfg

sleep 2

if [ $(ps -C haproxy --no-header | wc -l) -eq 0 ]; then

/etc/init.d/keepalived stop

4、启动keepalived服务和haproxy，然后查看日志，看看是否有2个vip

tail -n 30 /var/log/messages

Oct 23 13:49:13 master Keepalived_vrrp: VRRP_Instance(VI_2) Entering BACKUP STATE

Oct 23 13:49:13 master Keepalived_vrrp: VRRP sockpool: [ifindex(2), proto(112), fd(7,8)]

Oct 23 13:49:13 master Keepalived_vrrp: VRRP_Instance(VI_1) Transition to MASTER STATE

Oct 23 13:49:14 master Keepalived_vrrp: VRRP_Instance(VI_1) Entering MASTER STATE

Oct 23 13:49:14 master Keepalived_vrrp: VRRP_Instance(VI_1) setting protocol VIPs.

Oct 23 13:49:14 master Keepalived_vrrp: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth0 for 192.168.1.189

Oct 23 13:49:14 master avahi-daemon[2879]: Registering new address record for 192.168.1.189 on eth0.

Oct 23 13:49:19 master Keepalived_vrrp: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth0 for 192.168.1.189

##从192.168.1.22上可以看出,VI_2已经进入了backup角色,VI_1已经进入了master，并且已经绑定了192.168.1.189在eth0网卡

[root@master keepalived]# ip addr

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue

link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00

inet 127.0.0.1/8 scope host lo

inet6 ::1/128 scope host

valid_lft forever preferred_lft forever

2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000

link/ether 00:0c:29:06:ed:78 brd ff:ff:ff:ff:ff:ff

inet 192.168.1.22/24 brd 192.168.1.255 scope global eth0

inet 192.168.1.189/32 scope global eth0

inet6 fe80::20c:29ff:fe06:ed78/64 scope link

valid_lft forever preferred_lft forever

3: sit0: <NOARP> mtu 1480 qdisc noop

link/sit 0.0.0.0 brd 0.0.0.0

####从 192.168.1.9 haproxy和keepalived配置

haproxy不变，只是keepalived配置里的角色，权限需要跟master兑换下就可以了

vrrp_instance VI_1 {

state BACKUP

interface eth0

virtual_router_id 88

priority 99

advert_int 1

authentication {

auth_type PASS

auth_pass 5555

}

track_script {

chk_haproxy

}

virtual_ipaddress {

192.168.1.189

}

vrrp_instance VI_2 {

state MASTER

interface eth0

virtual_router_id 89

priority 100

advert_int 1

authentication {

auth_type PASS

auth_pass 1111

}

virtual_ipaddress {

192.168.1.199

}

启动haproxy和keepalived服务，查看vip是否已经绑定在eth0网卡

Oct 23 14:00:26 localhost Keepalived_vrrp: VRRP_Instance(VI_1) Entering BACKUP STATE

Oct 23 14:00:26 localhost Keepalived_vrrp: VRRP sockpool: [ifindex(2), proto(112), fd(10,11)]

Oct 23 14:00:27 localhost Keepalived_vrrp: VRRP_Instance(VI_2) Transition to MASTER STATE

Oct 23 14:00:28 localhost Keepalived_vrrp: VRRP_Instance(VI_2) Entering MASTER STATE

Oct 23 14:00:28 localhost Keepalived_vrrp: VRRP_Instance(VI_2) setting protocol VIPs.

Oct 23 14:00:28 localhost Keepalived_vrrp: VRRP_Instance(VI_2) Sending gratuitous ARPs on eth0 for 192.168.1.199

[root@localhost keepalived]# ip addr

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue

link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00

inet 127.0.0.1/8 scope host lo

inet6 ::1/128 scope host

valid_lft forever preferred_lft forever

2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000

link/ether 00:0c:29:2b:be:1a brd ff:ff:ff:ff:ff:ff

inet 192.168.1.9/24 brd 192.168.1.255 scope global eth0

inet 192.168.1.199/32 scope global eth0

inet6 fe80::20c:29ff:fe2b:be1a/64 scope link

valid_lft forever preferred_lft forever

3: sit0: <NOARP> mtu 1480 qdisc noop

link/sit 0.0.0.0 brd 0.0.0.0

四、web上的配置

在对应web上新增相关虚拟机 www.inbank.com,p_w_picpath.inbank.com

此处为了实验方便，就直接yum 安装了apache,在apache配置上的配置如下：

##web1 web2

NameVirtualHost *:80

ServerAdmin webmaster@dummy-host.example.com

DocumentRoot /var/www/html/inbank

ServerName www.inbank.com

ErrorLog logs/dummy-host.example.com-error_log

CustomLog logs/dummy-host.example.com-access_log common

</VirtualHost>

###web3 web4类似

在客户端修改hosts，新增以下2条记录

192.168.1.189 www.inbank.com

192.168.1.199 p_w_picpath.inbank.com

然后分别访问这2个网址，如下：

[root@master keepalived]# for i in `seq 1 4`;do curl http://p_w_picpath.inbank.com;done

img_133

img_244

img_133

img_244

[root@master keepalived]# for i in `seq 1 4`;do curl http://www.inbank.com;done

inbank_78

inbank_241

inbank_78

inbank_241

--如果出现以上的话，那就木有问题了

接下来测试高可用，停止master上的keepalived服务

[root@master keepalived]# /etc/init.d/keepalived stop

Stopping keepalived: [ OK ]

然后查看backup上的状态

Oct 23 14:00:33 localhost Keepalived_vrrp: VRRP_Instance(VI_2) Sending gratuitous ARPs on eth0 for 192.168.1.199

Oct 23 14:08:04 localhost Keepalived_vrrp: VRRP_Instance(VI_1) Transition to MASTER STATE

Oct 23 14:08:05 localhost Keepalived_vrrp: VRRP_Instance(VI_1) Entering MASTER STATE

Oct 23 14:08:05 localhost Keepalived_vrrp: VRRP_Instance(VI_1) setting protocol VIPs.

Oct 23 14:08:05 localhost Keepalived_vrrp: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth0 for 192.168.1.189

说明BACKUP已经接替MASTER了，然后再访问这2个网址，没问题的话，就大功告成了

##查看haproxy web 监控页面

http://192.168.1.189/haproxy-stats

或者http://192.168.1.199/haproxy-stats

#另，内核优化：

#haproxy+keepalived做前端，基本是tcp相关的内核优化，如下优化是一朋友线上环境用的，同样也适合lvs

net.ipv4.tcp_fin_timeout = 2

net.ipv4.tcp_tw_reuse = 1

net.ipv4.tcp_tw_recycle = 1

net.ipv4.tcp_syncookies = 1

net.ipv4.tcp_keepalive_time = 600

net.ipv4.ip_local_port_range = 4000 65000

net.ipv4.tcp_max_syn_backlog = 16384

net.ipv4.tcp_max_tw_buckets = 36000

net.ipv4.route.gc_timeout = 100

net.ipv4.tcp_syn_retries = 1

net.ipv4.tcp_synack_retries = 1

net.ipv4.ip_conntrack_max = 25000000

net.ipv4.netfilter.ip_conntrack_max=25000000

net.ipv4.netfilter.ip_conntrack_max=6553600

#####【另】

1、在此HAProxy+Keepalivp负载均衡高可用架构中，我们是如何解决session的问题呢？我们这里采用的是它自身的balance source机制，它跟Nginx的ip_hash机制原理类似，是让客户机访问时始终访问后端的某一台真实的web服务器，这样让session就固定下来了；

2、option httpchk HEAD /index.jsp HTTP/1.0 是网页监控，如果HAProxy检测不到Web的根目录下没有index.jsp，就会产生503报错。

3、有网友配置HAProxy时喜欢用listen IP:80这样的格式，这样其实不好，做负载均衡高可用时由于从机分配不到VIP地址，会导致从机启动不了，我建议用bind *:80的方式代替。

转载于:https://blog.51cto.com/inbank2012/1317075

你可能感兴趣的文章