openstack私有云布署实践【3 keepalive配置（VRRP虚IP）】
这里只用到keepalived 或者pacemaker两种方法，可二选一来配置，官方提供的是pacemaker，但我们实际测试环境和生产环境上使的是keepalive首先在4台controller上安装包（kxcontroller1 \ kxcontroller2 \ controller1 \ controller2 ）
yum -y install gcc openssl-devel popt-devel keepalived pcre-devel
配置 keepalived（防止局域网内不与keepalived组冲突的，可更改默认router_id LVS_DEVEL与 virtual_router_id 51的值）
我以办公网测试环境的2台controller的配置为例，科兴网的配置类同，只是IP不一样而已
/etc/keepalived/keepalived.conf-- 配置说明
内容：
! Configuration file for keepalived
global_defs {
notification_email {
#用来接收的邮件
noc-xxx@qq.com
}
#用来发送提醒的邮件
notification_email_from noc-xxx@qq.com
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id LVS_DEVE
}
vrrp_instance VI_1 {
#均采用BACKUP 防止相互抢占
state BACKUP
#监听的网卡名
interface eth0或bond0
virtual_router_id 52
#本机IP
mcast_src_ip 10.40.42.1
#权重-- 主的权重要大于备的
priority 49
advert_int 1
nopreempt
authentication {
auth_type PASS
auth_pass chtopnet
}
virtual_ipaddress {
#分配VIP
10.40.42.10
}
}
配置样例
# vi/etc/keepalived/keepalived.conf
! Configuration file for keepalived
global_defs {
notification_email {
noc-xxx@qq.com
}
notification_email_from noc-xxx@qq.com
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id LVS_DEVEi
}
vrrp_instance VI_1 {
state BACKUP
interface eno1
virtual_router_id 52
mcast_src_ip 10.40.42.1
priority 40
advert_int 1
nopreempt
authentication {
auth_type PASS
auth_pass chtopnet
}
#分配VIP
virtual_ipaddress {
10.40.42.10
}
}
# cat/etc/keepalived/keepalived.conf
! Configuration file for keepalived
global_defs {
notification_email {
noc-xxx@qq.com
}
notification_email_from noc-xxx@qq.com
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id LVS_DEVEi
}
vrrp_instance VI_1 {
state BACKUP
interface eno1
virtual_router_id 52
mcast_src_ip 10.40.42.2
priority 50
advert_int 1
nopreempt
authentication {
auth_type PASS
auth_pass chtopnet
}
virtual_ipaddress {
10.40.42.10
}
}
启动keepalived服务
service keepalived start
chkconfig keepalived on
如果配置，由于controller2的权重比controller1大，同时开启服务器，controller2会获取VIP，但因为我配置禁止抢占VIP的配置，所以你的服务是先后启动的话，VIP会先分到第1台启动的controller上，只有主动切换后VIP才会重新选举
切换测试VIP,
使用ip addr 命令查看当前的VIP使用在哪一台机器，一边长PING这个VIP，一边关闭交换机的端口，再实时使用ip addr 这条linux命令查看是否切换
PS：如果发现你的VIP在2台controller上都同时看到的话，应该及时查看/var/log/message日志，一般是由于没有关闭防火墙或者selinux而导致的。
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