keepalived+haproxy实现网站负载均衡和高可用
安装haproxy
tar zxvf haproxy-1.5.4.tar.gz
cd haproxy-1.5.4
make TARGET=linux26 PREFIX=/usr/local/haproxy
make install PREFIX=/usr/local/haproxy
创建haproxy配置文件目录
mkdir /usr/local/haproxy/conf
haproxy安装完成后。默认没有配置文件，将源码包里面的示例配置文件复制过来
cp /software/haproxy-1.5.4/examples/haproxy.cfg /usr/local/haproxy/conf/haproxy.conf
主节点和备用节点的haproxy.conf文件内容完全相同
vi haproxy.conf
global
log 127.0.0.1 local1 info
maxconn 4096
uid nobody
gid nobody
daemon
nbproc 1
pidfile /usr/local/haproxy/conf/haproxy.pid
defaults
mode http
retries 3
timeout connect 5s
timeout client 30s
timeout server 30s
timeout check 2s
listen admin_status
bind 0.0.0.0:19088
mode http
log 127.0.0.1 local1 err
stats refresh 30s
stats uri /admin-status
stats realm welcome login\ Haproxy
stats auth admin:admin
stats hide-version
stats admin if TRUE
frontend www
global
log 127.0.0.1 local1 info
maxconn 4096
uid nobody
gid nobody
daemon
nbproc 1
pidfile /usr/local/haproxy/conf/haproxy.pid
defaults
mode http
retries 3
timeout connect 5s
timeout client 30s
timeout server 30s
timeout check 2s
listen admin_status
bind 0.0.0.0:19088
mode http
log 127.0.0.1 local1 err
stats refresh 30s
stats uri /admin-status
stats realm welcome login\ Haproxy
stats auth admin:admin
stats hide-version
stats admin if TRUE
stats hide-version
stats admin if TRUE
frontend www
bind 172.23.146.150:80
mode http
option httplog
option forwardfor
log global
acl www_jiashenzhen hdr_dom(host) -i www.jiashenzhen.com
acl www_jsz hdr_dom(host) -i www.jsz.com
use_backend jiashenzhen if www_jiashenzhen
use_backend jsz if www_jsz
backend jiashenzhen
mode http
option redispatch
option abortonclose
balance roundrobin
option httpchk GET /index.html
server web1 172.23.146.147:81 weight 6 check inter 2000 rise 2 fall 3
server web2 172.23.145.12:81 weight 6 check inter 2000 rise 2 fall 3
backend jsz
mode http
option redispatch
option abortonclose
balance roundrobin
option httpchk GET /index.html
server web2 172.23.145.12:82 weight 6 check inter 2000 rise 2 fall 3
server web1 172.23.146.147:82 weight 6 check inter 2000 rise 2 fall 3
在这个haproxy配置中。通过ACL规则将两个站点分别转向web1,web2两个服务节点上
安装配置keepalived
yum install -y pcre-devel openssl-devel popt-devel #安装依赖包
wget http://www.keepalived.org/software/keepalived-1.2.7.tar.gz
tar zxvf keepalived-1.2.7.tar.gz
cd keepalived-1.2.7
./configure --prefix=/usr/local/keepalived
make
make install
优化路径
cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/
cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
mkdir /etc/keepalived/
cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/
cp /usr/local/keepalived/sbin/keepalived /usr/sbin/
修改keepalived的配置文件
vi /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
router_id Mysql_HA
}
vrrp_script chk_haproxy {
script "killall -0 haproxy"
interval 2
}
vrrp_instance HAProxy_HA {
state BACKUP
interface eth0
garp_master_delay 10
virtual_router_id 81
mcast_src_ip 172.23.146.147
priority 100
advert_int 1
nopreempt
authentication {
auth_type PASS
auth_pass hipiao
}
virtual_ipaddress {
172.23.146.150
}
track_script {
chk_haproxy
}
}
修改备用节点的keepalived.conf
priority值修改为90
去掉nopreempt选项
最后先启动haproxy
/usr/local/haproxy/sbin/haproxy -f /usr/local/haproxy/conf/haproxy.conf
再启动keepalived
/usr/sbin/keepalived start
如果启动haproxy报错 ##Starting frontend www: cannot bind socket
灰常重要的一个环节
修改内核参数： /etc/sysctl.conf
net.ipv4.ip_nonlocal_bind=1
保存结果，使结果生效
sysctl �p
设置haproxy日志
vi /etc/rsyslog.d/haproxy.conf
$ModLoad imudp
$UDPServerRun 514
local1.* /var/log/haproxy.log
修改
在local7.*下面加local1.* 大概在62行
local7.*
local1.*
重启服务
/etc/init.d/rsyslog restart
设置keepalived日志
修改 /etc/sysconfig/keepalived
把KEEPALIVED_OPTIONS="-D" 修改为KEEPALIVED_OPTIONS="-D -d -S 0"
设置syslog，修改/etc/rsyslog.conf
最后添加：
# keepalived -S 0
local0.* /var/log/keepalived.log
重新启动日志
/etc/init.d/rsyslog restart
使用以下命令进行验证
/etc/init.d/keepalived start /var/log/keepalived.log