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 {
[email protected]
}
notification_email_from [email protected]
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 {
[email protected]
}
notification_email_from [email protected]
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。