Haproxy+Keepalived集群实例配置

环境说明：

操作系统: Redhat 6.5 x64,本文采用rpm方式安装haproxy,keepalived。
如果采用原码安装：可以参考基础CentOS5.9 Haproxy+Keepalived+Jboss集群实施架构一例
app1: 192.168.0.24
app1: 192.168.0.25
VIP : 192.168.0.26
http1:192.168.0.24:8080 主机配置LAP环境。
http2:192.168.0.25:8080 主机配置LAP环境。

一、双机Keepalived配置

实现一个VIP出现，出例采用VIP地址是192.168.0.26。

1.安装keepalived软件

说明：RHEL/CentOS/OEL6.X安装版本中已经集成了keepalive-1.2.7，以及haproxy软件包经过安装没有问题。
在app1,app2两个节点上直接采用RPM包安装。

# rpm -ivh keepalived-1.2.7-3.el6.x86_64.rpm net-snmp-utils-5.5-49.el6.x86_64.rpm net-snmp-libs-5.5-49.el6.x86_64.rpm lm_sensors-3.1.1-17.el6.x86_64.rpm lm_sensors-
devel-3.1.1-17.el6.x86_64.rpm lm_sensors-libs-3.1.1-17.el6.x86_64.rpm
Preparing...                ########################################### [100%]
1:lm_sensors-libs        ########################################### [ 17%]
2:net-snmp-libs          ########################################### [ 33%]
3:keepalived             ########################################### [ 50%]
4:net-snmp-utils         ########################################### [ 67%]
5:lm_sensors             ########################################### [ 83%]
6:lm_sensors-devel       ########################################### [100%]
#

2. 创建keepalived配置文件

1) 在app1 节点一上配置文件
说明: 修改配置文件, 绑定的网卡是eth0，从机就是优先级与本机IP不一样外，其它都是一样，相比之前的示例增加了监控脚本。

# vi /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
xxx@126.com
}
notification_email_from service@abc.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 51
mcast_src_ip 192.168.0.24
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 876543
}
virtual_ipaddress {
192.168.0.26/24 dev eth0 label eth0:1
}
track_interface {
eth0
}
track_script {
chk_haproxy
}
}

2) 在app2节点二上配置文件

# vi /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
xxx@126.com
}
notification_email_from service@abc.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 51
mcast_src_ip 192.168.0.25
priority 99
advert_int 1
authentication {
auth_type PASS
auth_pass 876543
}
virtual_ipaddress {
192.168.0.26/24  dev eth0 label eth0:1
}
track_interface {
eth0
}
track_script {
chk_haproxy
}
}

3 .在app1,app2两节点上启动与创建keepalived服务

1) 启动服务并加为开机启动:

service keepalived start
chkconfig keepalived on

2) 测试并观察VIP漂移情况
(1) VIP地址切换观察
说明：两种方式切换VIP, 一个是关闭haproxy代理服务，一个是关闭相关节点的Keepalived服务。

[root@app1 /]# service keepalived start
Starting keepalived: [ OK ]
[root@app1 keepalived]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN
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 state UP qlen 1000
link/ether 00:0c:29:4c:39:43 brd ff:ff:ff:ff:ff:ff
inet 192.168.0.24/24 brd 192.168.0.255 scope global eth0
inet 192.168.0.26/24 scope global secondary eth0:1
inet6 fe80::20c:29ff:fe4c:3943/64 scope link
valid_lft forever preferred_lft forever
[root@app1 keepalived]#

[root@app2 keepalived]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN
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 state UP qlen 1000
link/ether 00:0c:29:cf:05:99 brd ff:ff:ff:ff:ff:ff
inet 192.168.0.25/24 brd 192.168.0.255 scope global eth0
inet6 fe80::20c:29ff:fecf:599/64 scope link
valid_lft forever preferred_lft forever
[root@app2 keepalived]#
注：可以关闭keepalived服务,以及关闭haproxy服务，通过tail -f /var/log/messages观察VIP移动情况。
Jan 11 12:54:19 app2 Keepalived_vrrp[26911]: VRRP_Instance(VI_1) Received higher prio advert
Jan 11 12:54:19 app2 Keepalived_vrrp[26911]: VRRP_Instance(VI_1) Entering BACKUP STATE
Jan 11 12:54:19 app2 Keepalived_vrrp[26911]: VRRP_Instance(VI_1) removing protocol VIPs.
Jan 11 12:54:19 app2 Keepalived_healthcheckers[26910]: Netlink reflector reports IP 192.168.0.26 removed

二、HAproxy反向代理配置

app1, app2配置操作

1. 添加非本机IP邦定支持

# vi /etc/sysctl.conf
net.ipv4.ip_nonlocal_bind = 1
# sysctl -p

2. 安装haproxy软件

# rpm -ivh haproxy-1.4.24-2.el6.x86_64.rpm

3. 创建配置文件

1）app1上创建配置文件

# vi /usr/local/haproxy/conf/haproxy.cfg
global
log  127.0.0.1   local0
maxconn     4000
chroot      /var/lib/haproxy
pidfile     /var/run/haproxy.pid
user        haproxy
group       haproxy
daemon
nbproc 1
stats socket /var/lib/haproxy/stats
defaults
log       global
mode      http
option    httplog
option    dontlognull
option    redispatch
option    httpclose
option    forwardfor
retries   3
maxconn   2000
contimeout  5000
clitimeout  50000
srvtimeout  50000
timeout check   1s
timeout http-request    10s
timeout queue           1m
timeout connect         10s
timeout client          1m
timeout server          1m
timeout http-keep-alive 10s
listen stats
mode http
bind 0.0.0.0:91
stats enable
stats uri /admin
stats realm "Admin console"
stats auth admin:123456
stats hide-version
stats refresh 10s
stats admin if TRUE
frontend web_proxy
bind *:80
mode http
acl url_dynamic path_end -i .php
use_backend phpserver if url_dynamic
default_backend webservers
backend webservers
balance roundrobin
option httpchk GET /test.html HTTP/1.0\r\nHost:192.168.0.26
server node01 192.168.0.24:8080 weight 3 check inter 2000 rise 2 fall 1
server node02 192.168.0.25:8080 weight 3 check inter 2000 rise 2 fall 1
backend phpserver
balance roundrobin
option httpchk GET /test.php
server node01 192.168.0.24:8080 weight 3 check inter 2000 rise 2 fall 1

2）app2上创建配置文件

# vi /usr/local/haproxy/conf/haproxy.cfg
global
log  127.0.0.1   local0
maxconn 4000
chroot      /var/lib/haproxy
pidfile     /var/run/haproxy.pid
user        haproxy
group       haproxy
daemon
nbproc 1
stats socket /var/lib/haproxy/stats
defaults
log       global
mode      http
option    httplog
option    dontlognull
option    redispatch
option    httpclose
option    forwardfor
retries   3
maxconn   2000
contimeout  5000
clitimeout  50000
srvtimeout  50000
timeout check   1s
timeout http-request    10s
timeout queue           1m
timeout connect         10s
timeout client          1m
timeout server          1m
timeout http-keep-alive 10s
listen stats
mode http
bind 0.0.0.0:91
stats enable
stats uri /admin
stats realm "Admin console"
stats auth admin:123456
stats hide-version
stats refresh 10s
stats admin if TRUE
frontend web_proxy
bind *:80
mode http
acl url_dynamic path_end -i .php
use_backend phpserver if url_dynamic
default_backend webservers
backend webservers
balance roundrobin
option httpchk GET /test.html HTTP/1.0\r\nHost:192.168.0.26
server node01 192.168.0.24:8080 weight 3 check inter 2000 rise 2 fall 1
server node02 192.168.0.25:8080 weight 3 check inter 2000 rise 2 fall 1
backend phpserver
balance roundrobin
option httpchk GET /test.html
server node01 192.168.0.24:8080 weight 3 check inter 2000 rise 2 fall 1

说明：两节点互为主备模式，均优化将本机的节点应用做为主节点，也可以为负载均衡模式, 主例也配置了一个动静分离的模式。

4. app1,app2上配置HAproxy日志文件

Haproxy日志配置,否则默认是不记haproxy日志的，注意与RHEL/CentOS5.x版本的区别。

# vi /etc/rsyslog.conf
$ModLoad imudp
$UDPServerRun 514
$UDPServerAddress 127.0.0.1
local0.* /var/log/haproxy.log
*.info;mail.none;authpriv.none;cron.none;local0.none /var/log/messages
说明: 第五行是去掉在/var/log/message再记录haproxy.log日志的功能的。
直接手动执行
service rsyslog restart

注：Redhat/Centos6.X 默认haproxy服务运行采用haproxy用户，RPM包安装haproxy，系统已自动配置日录文件轮询功能。

三、配置Keepalived注意点小结：

1，是否有多VIP地址，如果有的话，需要配置多个vrrp_instance实例，双机互备。
2，监控脚本，用于监控nginx，或haproxy代理服务器的存活状态，用于切换VIP地址。
3，两种方式切换VIP,一个是关闭代理服务，一个是关闭相关节点的Keepalived服务器。
本文出自 “koumm的linux技术博客” 博客，请务必保留此出处http://koumm.blog.51cto.com/703525/1733880