keepalived 双主模型

Posted 2022-01-02

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keepalived 双主模型

双主模型是两台服务器互为主备，即一台为主备，另一台为备主，让两台服务器并行运行，也可以实现减轻单台keepalived主机上的压力。
双主模型需要注意此时需要有2个VIP地址

keepalived 双主模型实现

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

# 双主模型需要定义两个VIP配置端，一个为主的配置端一个为备的配置端
vrrp_instance VI_1                 #配置第一个实例
    state MASTER                    #定义角色为主
    interface ens33
    virtual_router_id 27            #双主时需要注意虚拟路由必须与另一个虚拟路由ID不同
    priority 100                    #定义优先级
    advert_int 2
    authentication 
        auth_type PASS
        auth_pass 1111
    
    unicast_src_ip 172.20.27.10     #定义单播源地址
    unicast_peer                   
    172.20.27.11                    #定义单播的目标地址
    
    virtual_ipaddress 
        172.20.27.100 dev ens33 label ens33:0       #在一个实例中，vip可以是多个，此处以绑定两个地址为例子，双主模型中如果每个主的实例中都有两个vip，那么当其中一个主挂了之后另一个将获取4个地址。
        172.20.27.101 dev ens33 label ens33:1
    


vrrp_instance VI_2                 #定义第二个实例
    state BACKUP                    #双主模型中第二个实例的角色就为备
    interface ens33
    virtual_router_id 37            #虚拟路由ID需要改为和第一个实例不同
    priority 80                     #因为为备服务器所以优先级需要降低
    advert_int 2        
    authentication 
        auth_type PASS
        auth_pass 1111
    
    unicast_src_ip 172.20.27.10     #设置单播的源地址
    unicast_peer 
    172.20.27.11                    #设置单薄的目标地址
    
    virtual_ipaddress 
        172.20.27.200 dev ens33 label ens33:2       #配置虚拟IP
        172.20.27.201 dev ens33 label ens33:3

重启服务

[[email protected] ~]# systemctl restart keepalived

s2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 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
    
    unicast_src_ip 172.20.27.11
    unicast_peer 
    172.20.27.10
    
    virtual_ipaddress 
        172.20.27.100 dev ens33 label ens33:0
        172.20.27.101 dev ens33 label ens33:1
    


vrrp_instance VI_2 
    state MASTER
    interface ens33
    virtual_router_id 37
    priority 100
    advert_int 2
    authentication 
        auth_type PASS
        auth_pass 1111
    
    unicast_src_ip 172.20.27.11
    unicast_peer 
    172.20.27.10
    
    virtual_ipaddress 
        172.20.27.200 dev ens33 label ens33:2
        172.20.27.201 dev ens33 label ens33:3

重启服务

[[email protected] ~]# systemctl restart keepalived

测试

查看s1 s2节点上绑定的虚拟IP信息
s1节点

[[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 159893  bytes 13229687 (12.6 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 36390  bytes 8038414 (7.6 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
# S1节点中 100，101为主
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)

ens33:1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 172.20.27.101  netmask 255.255.255.255  broadcast 0.0.0.0
        ether 00:0c:29:c5:12:3c  txqueuelen 1000  (Ethernet)

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

s2节点

[[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 146792  bytes 12377811 (11.8 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 5501  bytes 486871 (475.4 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
#s2中 200，201 为主
ens33:2: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 172.20.27.200  netmask 255.255.255.255  broadcast 0.0.0.0
        ether 00:0c:29:4d:1c:e3  txqueuelen 1000  (Ethernet)

ens33:3: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 172.20.27.201  netmask 255.255.255.255  broadcast 0.0.0.0
        ether 00:0c:29:4d:1c:e3  txqueuelen 1000  (Ethernet)

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

测试s1停止服务

[[email protected] ~]# systemctl stop keepalived

在s2节点上查看

[[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 162656  bytes 13744995 (13.1 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 6334  bytes 551143 (538.2 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
#s2节点上获取了所有的4个地址
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)

ens33:1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 172.20.27.101  netmask 255.255.255.255  broadcast 0.0.0.0
        ether 00:0c:29:4d:1c:e3  txqueuelen 1000  (Ethernet)

ens33:2: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 172.20.27.200  netmask 255.255.255.255  broadcast 0.0.0.0
        ether 00:0c:29:4d:1c:e3  txqueuelen 1000  (Ethernet)

ens33:3: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 172.20.27.201  netmask 255.255.255.255  broadcast 0.0.0.0
        ether 00:0c:29:4d:1c:e3  txqueuelen 1000  (Ethernet)

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

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