keepalived + nginx

bestjoe

　　本文主要介绍keepalived的安装,Nginx自行解决,也可以使用httpd.随便任何服务都可以...
　　keepalived 官网http://www.keepalived.org/index.html#
　　我不的不吐槽keepalived 官方文档写的...
　　环境:
　　CentOS 6.6x64 minimal 禁用selinux iptables
　　1.安装环境包:



yum install openssl-devel gcc popt wget  libnl-devel -y
　　2.安装keepalived:



wget http://www.keepalived.org/software/keepalived-1.2.19.tar.gz
tar xvf  keepalived-1.2.19.tar.gz
cd keepalived-1.2.19
./configure
make
make install
　　(最新的包自己去官网下)
　　安装很简单,但是装完我不得不吐槽了..
　　3.配置:



mkdir /etc/keepalived
ln -s /usr/local/etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf
ln -s /usr/local/etc/sysconfig/keepalived  /etc/sysconfig/keepalived
ln -s /usr/local/etc/rc.d/init.d/keepalived  /etc/rc.d/init.d/keepalived
ln -s /usr/local/sbin/keepalived /usr/bin/
　　
　　主要用ln是为了方便管理.这个keepalived都安装在/etc/user/local 而他却需要的配置文件又是从/开始的 所以搞不懂....
　　4.真正的配置keepalived.conf



cd /usr/local/etc/keepalived/
vi keepalived.conf
　　
　　Master(样例):　　



[iyunv@web2 ~]# cat /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
acassen@firewall.loc
failover@firewall.loc
sysadmin@firewall.loc
}
notification_email_from Alexandre.Cassen@firewall.loc
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id LVS_DEVEL
}
vrrp_instance VI_1 {
state MASTER
interface eth0
virtual_router_id 51
mcast_src_ip 192.168.6.25
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.6.20
}
　　
　　解释一下:
因为我没有使用LVS所以virtual server段都被删除了....
global_defs{ #块全局的配置(也没发现能配置什么)
notification_email {} #通知邮件的收件人,下边from 就是发件人
支持SMTP.但是不支持用户登录(找了好多文档也没找到用户登陆的user和passwd 谁知道可以留言)
route_id #不知道什么估计就是keepalived的iD名字吧,或者和LVS有关系
　　}
　　VRRP_instance VI_1{ #VRRP实例段,关键地方 VI_1 也可以有VI_2,不同的VRRP实例 需要不同的 virtual_router_id
　　
　　state  #标记主备的 MASTER主BACKUP是备
interface #VIP绑定在哪个网卡上
virtual_router_id # VRRP实例的ID用来区分不同的VRRP
mcast_src_ip #VRRP包的封装IP,真实网卡IP
priority #权重,主备之间值不一样,值越大越优先,做实验的时候忘记改了..结果 VIP回不到主上..
advert_int #指定VRRP广播包发送间隔
authentication #VRRP实例之间的认证
virtual_ipaddress #VIP 就是用户要访问的IP地址.这个ip地址会在不同的keepalived实例上飞来飞去
　　}
　　5.查看IP


　　[iyunv@web2 ~]# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 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 52:54:00:35:cb:3d brd ff:ff:ff:ff:ff:ff
    inet 192.168.6.25/24 brd 192.168.6.255 scope global eth0
    inet 192.168.6.20/32 scope global eth0
    inet6 fe80::5054:ff:fe35:cb3d/64 scope link
       valid_lft forever preferred_lft forever
　　6.监控
　　这个东西不会主动去监控服务是否正常.自己写脚本监控主机上的服务如果服务不正常就把keepalived停掉就好了...
　　
　　BACKUP(样例):



[iyunv@we1 ~]# cat /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
acassen@firewall.loc
failover@firewall.loc
sysadmin@firewall.loc
}
notification_email_from Alexandre.Cassen@firewall.loc
smtp_server 192.168.200.1
smtp_connect_timeout 30
router_id LVS_DEVEL
}
vrrp_instance VI_1 {
state BACKUP
interface eth0
virtual_router_id 51
priority 99
mcast_src_ip 192.168.6.26
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.6.20
}
}