摘要：
两端都为双主，也同时为对方的备份，主服务器宕机，从服务器自动切换上去，保证主服务器能使用，也不影响从服务器使用一、修改192.168.1.4上keepalived配置文件vim/etc/keepalived/keepalived.conf1、复制实例1修改前：vrrp_instanceVI_1{stateMASTERinterfaceens33virtual_router_id88priority
两端都为双主，也同时为对方的备份，主服务器宕机，从服务器自动切换上去，保证主服务器能使用，也不影响从服务器使用
一、修改192.168.1.4上keepalived配置文件
vim /etc/keepalived/keepalived.conf1、复制实例1
修改前：
vrrp_instance VI_1 {
state MASTER
interface ens33
virtual_router_id 88priority 100advert_int 1authentication {
auth_type PASS
auth_pass 123456}
virtual_ipaddress {
192.168.1.100/24 dev ens33 label ens33:1}
notify_master "/etc/keepalived/notify.sh master"notify_backup "/etc/keepalived/notify.sh backup"notify_fault "/etc/keepalived/notify.sh fault"}修改后：
vrrp_instance VI_2{
state BACKUP
interface ens33
virtual_router_id 66priority 90advert_int 1authentication {
auth_type PASS
auth_pass 654321}
virtual_ipaddress {
192.168.1.200/24 dev ens33 labelens33:2}
notify_master "/etc/keepalived/notify.sh master"notify_backup "/etc/keepalived/notify.sh backup"notify_fault "/etc/keepalived/notify.sh fault"}二、修改192.168.1.8的实例
1、复制实例1
修改前：
vrrp_instance VI_1 {
state BACKUP
interface ens33
virtual_router_id 88priority 90advert_int 1authentication {
auth_type PASS
auth_pass 123456}
virtual_ipaddress {
192.168.1.100/24 dev ens33 label ens33:1}
notify_master "/etc/keepalived/notify.sh master"notify_backup "/etc/keepalived/notify.sh backup"notify_fault "/etc/keepalived/notify.sh fault"}修改后：
vrrp_instanceVI_2 {
state MASTER
interface ens33
virtual_router_id 66priority 100advert_int 1authentication {
auth_type PASS
auth_pass 654321}
virtual_ipaddress {
192.168.1.200/24 dev ens33 label ens33:2}
notify_master "/etc/keepalived/notify.sh master"notify_backup "/etc/keepalived/notify.sh backup"notify_fault "/etc/keepalived/notify.sh fault"}三、目前192.168.1.4这台服务器VIP地址是192.168.1.100
ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00inet 127.0.0.1/8scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128scope host
valid_lft forever preferred_lft forever
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000link/ether 00:0c:29:88:cd:f0 brd ff:ff:ff:ff:ff:ff
inet 192.168.1.4/24 brd 192.168.1.255scope global ens33
valid_lft forever preferred_lft forever
inet 192.168.1.100/24 scope global secondary ens33:1valid_lft forever preferred_lft forever
inet6 fe80::82fc:253f:d442:8fa4/64scope link
valid_lft forever preferred_lft forever四、目前192.168.1.8的VIP地址192.168.1.200
ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00inet 127.0.0.1/8scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128scope host
valid_lft forever preferred_lft forever
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000link/ether 00:0c:29:62:3f:c8 brd ff:ff:ff:ff:ff:ff
inet 192.168.1.8/24 brd 192.168.1.255scope global ens33
valid_lft forever preferred_lft forever
inet 192.168.1.200/24 scope global secondary ens33:2valid_lft forever preferred_lft forever
inet6 fe80::ff68:f7e6:3d27:aa58/64scope link
valid_lft forever preferred_lft forever
inet6 fe80::5585:1cb1:8329:e534/64scope link tentative dadfailed
valid_lft forever preferred_lft forever五、停止192.168.1.8的keepalived服务
systemctl stop keepalived六、查看192.168.1.4的IP地址
ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00inet 127.0.0.1/8scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128scope host
valid_lft forever preferred_lft forever
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000link/ether 00:0c:29:88:cd:f0 brd ff:ff:ff:ff:ff:ff
inet 192.168.1.4/24 brd 192.168.1.255scope global ens33
valid_lft forever preferred_lft forever
inet 192.168.1.100/24 scope global secondary ens33:1valid_lft forever preferred_lft forever
inet 192.168.1.200/24 scope global secondary ens33:2valid_lft forever preferred_lft forever
inet6 fe80::82fc:253f:d442:8fa4/64scope link
valid_lft forever preferred_lft forever