关键词：
keepalived 组播的配置准备主机2台
| server | hostname | ip |
|---|---|---|
| keepalived | s1 | 172.20.27.10 |
| keepalived | s2 | 172.20.27.11 |
S1节点配置
修改keepalived配置文件
[[email protected] ~]# vim /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 s1.mylinuxops.com
vrrp_skip_check_adv_addr
vrrp_strict
vrrp_iptables
vrrp_garp_interval 0
vrrp_gna_interval 0
vrrp_instance VI_1
state MASTER
interface ens33
virtual_router_id 27
priority 100
advert_int 2
authentication
auth_type PASS
auth_pass 1111
virtual_ipaddress
172.20.27.100 dev ens33 label ens33:0
启动服务
[[email protected] ~]# systemctl restart keepalived查看vip是否绑定
[[email protected] ~]# ip a | grep ens33:0
inet 172.20.27.100/32 scope global ens33:0s2节点操作
修改keepalive的配置文件
[[email protected] ~]# vim /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 s2.mylinuxops.com
vrrp_skip_check_adv_addr
vrrp_strict
vrrp_iptables
vrrp_garp_interval 0
vrrp_gna_interval 0
vrrp_instance VI_1
state BACKUP
interface ens33
virtual_router_id 27
priority 80
advert_int 2
authentication
auth_type PASS
auth_pass 1111
virtual_ipaddress
172.20.27.100 dev ens33 label ens33:0
重启服务
[[email protected] ~]# systemctl start keepalived抓包查看是否组播
在s1节点上抓包
[[email protected] ~]# tcpdump -i ens33:0 -nn net 224.0.0.18
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on ens33:0, link-type EN10MB (Ethernet), capture size 262144 bytes
18:59:35.835747 IP 172.20.27.10 > 224.0.0.18: VRRPv2, Advertisement, vrid 27, prio 100, authtype simple, intvl 2s, length 20
18:59:37.837171 IP 172.20.27.10 > 224.0.0.18: VRRPv2, Advertisement, vrid 27, prio 100, authtype simple, intvl 2s, length 20抓到发往224.0.0.18的信息
测试keepalived
暂停s1的keepalived服务器查看地址是否会漂移到s2节点上
在s1节点上暂停服务
[[email protected] ~]# systemctl stop keepalived在s2节点上查看VIP是否被移过来了
[[email protected] ~]# ifconfig
ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 172.20.27.11 netmask 255.255.0.0 broadcast 172.20.255.255
inet6 fe80::20c:29ff:fe4d:1ce3 prefixlen 64 scopeid 0x20<link>
ether 00:0c:29:4d:1c:e3 txqueuelen 1000 (Ethernet)
RX packets 21578 bytes 1824843 (1.7 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 311 bytes 28607 (27.9 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
ens33:0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 172.20.27.100 netmask 255.255.255.255 broadcast 0.0.0.0
ether 00:0c:29:4d:1c:e3 txqueuelen 1000 (Ethernet)
#VIP漂移到s2节点上了
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 1000 (Local Loopback)
RX packets 6 bytes 482 (482.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 6 bytes 482 (482.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0再次启动s1节点查看是否地址是否被夺回
[[email protected] ~]# systemctl start keepalived
[[email protected] ~]# ifconfig
ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 172.20.27.10 netmask 255.255.0.0 broadcast 172.20.255.255
inet6 fe80::20c:29ff:fec5:123c prefixlen 64 scopeid 0x20<link>
ether 00:0c:29:c5:12:3c txqueuelen 1000 (Ethernet)
RX packets 38095 bytes 2925087 (2.7 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 28612 bytes 7301619 (6.9 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
ens33:0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 172.20.27.100 netmask 255.255.255.255 broadcast 0.0.0.0
ether 00:0c:29:c5:12:3c txqueuelen 1000 (Ethernet)
# VIP地址再次被抢回去
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 1000 (Local Loopback)
RX packets 2 bytes 140 (140.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 2 bytes 140 (140.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
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