keepalived 配置（一）

1.keepalived 下载 地址 目前最新版本
2.安装keepalived 
tar -axvf keepalived-1.2.2.tar.gz
./configure    --prefix=PREFIX（指定安装路径）  --with-kernel-version=VER (指定内核版本）
Keepalived configuration
------------------------
Keepalived version       : 1.2.2
Compiler                 : gcc
Compiler flags           : -g -O2 -DETHERTYPE_IPV6=0x86dd
Extra Lib                : -lpopt -lssl -lcrypto
Use IPVS Framework       : No
IPVS sync daemon support : No
Use VRRP Framework       : Yes
Use Debug flags          : No
默认是关闭LVS的支持，如果你需要开启这个功能编译的开启即可
make
make install


3.配置 keepalived.conf文件
! Configuration File for keepalived
vrrp_instance VI_1 {
    state BACKUP   （状态）
    interface eth0  （心跳网卡）
    virtual_router_id 51 （实例，这要跟对端的名字一样）
    priority 100   （优先级）
    advert_int 1  （间隔时间）
    nopreempt  (闭闭抢站，不指这个参数默认是开启的）
    authentication {     （认证信息）
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.177.200   （虚拟IP地址）
    }
}
4.启动keepalived
../../sbin/keepalived  -f keepalived.conf （注意这种写法有有问题需要写绝对路径，这样会导致起动的时候不读配置文件）
../../sbin/keepalived -D -f /usr/local/keepalived/etc/keepalived/keepalived.conf（这个才是正确）
5.检查
oot@192_168_177_36 keepalived-1.2.2]# ps aux|grep keepalived
root      6976  0.0  0.0   4888   568 ?        Ss   13:12   0:00 ../../sbin/keepalived -D -f /usr/local/keepalived/etc/keepalived/keepalived.conf
root      6977  0.0  0.0   4932   916 ?        S    13:12   0:00 ../../sbin/keepalived -D -f /usr/local/keepalived/etc/keepalived/keepalived.conf
2: eth0: mtu 1500 qdisc pfifo_fast qlen 1000
    link/ether 14:fe:b5:cf:8f:ae brd ff:ff:ff:ff:ff:ff
    inet 192.168.177.36/24 brd 192.168.177.255 scope global eth0
    inet 192.168.177.200/32 scope global eth0
    inet6 fe80::16fe:b5ff:fecf:8fae/64 scope link
       valid_lft forever preferred_lft forever
[root@192_168_177_36 keepalived-1.2.2]# tcpdump dst 224.0.0.18
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes
13:23:40.947767 IP 192.168.177.37 > vrrp.mcast.net: VRRPv2, Advertisement, vrid 51, prio 110, authtype simple, intvl 1s, length 20
13:23:41.049223 IP 192_168_177_36.localdomain > vrrp.mcast.net: VRRPv2, Advertisement, vrid 51, prio 100, authtype simple, intvl 1s, length 20
13:23:41.948702 IP 192.168.177.37 > vrrp.mcast.net: VRRPv2, Advertisement, vrid 51, prio 110, authtype simple, intvl 1s, length 20
13:23:42.050174 IP 192_168_177_36.localdomain > vrrp.mcast.net: VRRPv2, Advertisement, vrid 51, prio 100, authtype simple, intvl 1s, length 20
13:23:42.949652 IP 192.168.177.37 > vrrp.mcast.net: VRRPv2, Advertisement, vrid 51, prio 110, authtype simple, intvl 1s, length 20
13:23:43.051040 IP 192_168_177_36.localdomain > vrrp.mcast.net: VRRPv2, Advertisement, vrid 51, prio 100, authtype simple, intvl 1s, length 20
13:23:43.950513 IP 192.168.177.37 > vrrp.mcast.net: VRRPv2, Advertisement, vrid 51, prio 110, authtype simple, intvl 1s, length 20
13:23:44.052035 IP 192_168_177_36.localdomain > vrrp.mcast.net: VRRPv2, Advertisement, vrid 51, prio 100, authtype simple, intvl 1s, length 20

由于keepalived 是走的 VRRP协议，组播地址是224.0.0.18 配置的时候防火墙需要放行这个地址,你用TCP dump 的时候可以看到双向的HELOO 报文。
6.其它的一些功能看配置文件里面有个实例照着做就可以了