lvs+keepalived+mariadb集群

1、环境准备
节点1：172.16.2.95
节点2：172.16.2.160
节点3：172.16.2.220
LVS1：172.16.2.67
LVS2：172.16.2.234

2、mariadb集群的安装

https://www.cnblogs.com/linyouyi/p/11515639.html

3、在三台安装mariadb机器操作

echo  > /proc/sys/net/ipv4/conf/lo/arp_ignore

echo  > /proc/sys/net/ipv4/conf/lo/arp_announce

echo  > /proc/sys/net/ipv4/conf/all/arp_ignore

echo  > /proc/sys/net/ipv4/conf/all/arp_announce

ifconfig lo: 172.16.2.253 broadcast 172.16.2.253 netmask 255.255.255.255 up

#ifconfig lo: 172.16.2.253 netmask 255.255.255.255 up

route add -host 172.16.2.253 lo:

3.1、查看虚拟ip

//01

[root@hadoop01 linyouyi]# ip addr show lo

: lo: <LOOPBACK,UP,LOWER_UP> mtu  qdisc noqueue state UNKNOWN group default qlen

    link/loopback ::::: brd :::::

    inet 127.0.0.1/ scope host lo

       valid_lft forever preferred_lft forever

    inet 172.16.2.253/ brd 172.16.2.253 scope global lo:

       valid_lft forever preferred_lft forever

    inet6 ::/ scope host

       valid_lft forever preferred_lft forever

[root@hadoop01 linyouyi]# route -n

Kernel IP routing table

Destination     Gateway         Genmask         Flags Metric Ref    Use Iface

0.0.0.0         172.16.2.1      0.0.0.0         UG                   eth0

0.0.0.0         172.16.2.1      0.0.0.0         UG                 eth0

169.254.169.254 172.16.2.1      255.255.255.255 UGH                eth0

172.16.2.0      0.0.0.0         255.255.255.0   U                  eth0

172.16.2.253    0.0.0.0         255.255.255.255 UH                   lo

172.17.0.0      0.0.0.0         255.255.0.0     U                    docker0

//02

[root@hadoop02 mariadb]# ip addr show lo

: lo: <LOOPBACK,UP,LOWER_UP> mtu  qdisc noqueue state UNKNOWN qlen

    link/loopback ::::: brd :::::

    inet 127.0.0.1/ scope host lo

       valid_lft forever preferred_lft forever

    inet 172.16.2.253/ brd 172.16.2.253 scope global lo:

       valid_lft forever preferred_lft forever

    inet6 ::/ scope host

       valid_lft forever preferred_lft forever

[root@hadoop02 mariadb]# route -n

Kernel IP routing table

Destination     Gateway         Genmask         Flags Metric Ref    Use Iface

0.0.0.0         172.16.2.1      0.0.0.0         UG                 eth0

169.254.169.254 172.16.2.1      255.255.255.255 UGH                eth0

172.16.2.0      0.0.0.0         255.255.255.0   U                  eth0

172.16.2.253    0.0.0.0         255.255.255.255 UH                   lo

172.17.0.0      0.0.0.0         255.255.0.0     U                    docker0

//03

[root@hadoop03 mariadb]# ip addr show lo

: lo: <LOOPBACK,UP,LOWER_UP> mtu  qdisc noqueue state UNKNOWN qlen

    link/loopback ::::: brd :::::

    inet 127.0.0.1/ scope host lo

       valid_lft forever preferred_lft forever

    inet 172.16.2.253/ brd 172.16.2.253 scope global lo:

       valid_lft forever preferred_lft forever

    inet6 ::/ scope host

       valid_lft forever preferred_lft forever

[root@hadoop03 mariadb]# route -n

Kernel IP routing table

Destination     Gateway         Genmask         Flags Metric Ref    Use Iface

0.0.0.0         172.16.2.1      0.0.0.0         UG                 eth0

169.254.169.254 172.16.2.1      255.255.255.255 UGH                eth0

172.16.2.0      0.0.0.0         255.255.255.0   U                  eth0

172.16.2.253    0.0.0.0         255.255.255.255 UH                   lo

172.17.0.0      0.0.0.0         255.255.0.0     U                    docker0

4、LVS1安装keepalived-1.3.5和ipvsadm-1.27

[root@LVS1 ~]# yum -y install keepalived ipvsadm

[root@LVS1 ~]# cd /etc/keepalived

[root@LVS1 keepalived]# cp keepalived.conf keepalived.conf.bak

[root@LVS1 keepalived]# vim keepalived.conf

global_defs {

    notification_email {

        admin@linyouyi.com

    }

    notification_email_from ka@localhost

    smtp_server 127.0.0.1

    smtp_connect_timeout

    router_id lvs1

}

vrrp_instance VI_1 {

    state MASTER

    interface eth0

    virtual_router_id

    priority

    advert_int

    authentication {

        auth_type pass

        auth_pass forlvs

    }

    virtual_ipaddress {

        172.16.2.253

    }

}

virtual_server 172.16.2.253  {

    delay_loop

    lb_algo rr

    lb_kind DR

    nat_mask 255.255.255.255

    persistence_timeout

    protocol TCP

    real_server 172.16.2.95  {

        weight

        TCP_CHECK {

            connect_timeout

            nb_get_retry

            delay_before_retry

            connect_port

        }

    }

    real_server 172.16.2.220  {

        weight

        TCP_CHECK {

            connect_timeout

            nb_get_retry

            delay_before_retry

            connect_port

        }

    }

    real_server 172.16.2.160  {

        weight

        TCP_CHECK {

            connect_timeout

            nb_get_retry

            delay_before_retry

            connect_port

        }

    }

}

[root@LVS1 keepalived]# systemctl start keepalived

[root@LVS1 keepalived]# ipvsadm -Ln

IP Virtual Server version 1.2. (size=)

Prot LocalAddress:Port Scheduler Flags

  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn

TCP  172.16.2.253: rr persistent

  -> 172.16.2.95:             Route

  -> 172.16.2.160:            Route

  -> 172.16.2.220:            Route

// 但是其他的机器总是访问不了vip,不知道是云主机不能用keepalived虚拟ip还是啥原因,还没找到

4.1、测试

[root@LVS1 keepalived]# ip addr show eth0

: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu  qdisc pfifo_fast state UP group default qlen

    link/ether fa::3e:2f:b0:e0 brd ff:ff:ff:ff:ff:ff

    inet 172.16.2.67/ brd 172.16.2.255 scope global dynamic eth0

       valid_lft 85187sec preferred_lft 85187sec

    inet 172.16.2.253/ scope global eth0

       valid_lft forever preferred_lft forever

    inet6 fe80::f816:3eff:fe2f:b0e0/ scope link

       valid_lft forever preferred_lft forever

//把数据库220的mariadb停掉

[root@LVS1 keepalived]# ipvsadm

IP Virtual Server version 1.2. (size=)

Prot LocalAddress:Port Scheduler Flags

  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn

TCP  cx--.novalocal:mysql rr persistent

  -> 172.16.2.95:mysql            Route

  -> 172.16.2.160:mysql           Route

5、LVS1安装keepalived-1.3.5和ipvsadm-1.27

[root@LVS2 keepalived]# vim keepalived.conf

global_defs {

    router_id lvs2

}

vrrp_instance VI_1 {

    state BACKUP

    priority 

    }

}

//配置文件这几项改一下,其余的步骤和LVS1一样

5.1、测试LVS高可用

把LVS1的keepalived停掉,看VIP会不会自动移动到LVS2

[root@LVS1 keepalived]# systemctl stop keepalived

[root@LVS2 ~]# ip addr show eth0

: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu  qdisc pfifo_fast state UP group default qlen

    link/ether fa::3e:a3:: brd ff:ff:ff:ff:ff:ff

    inet 172.16.2.234/ brd 172.16.2.255 scope global dynamic eth0

       valid_lft 62412sec preferred_lft 62412sec

    inet 172.16.2.253/ scope global eth0

       valid_lft forever preferred_lft forever

    inet6 fe80::f816:3eff:fea3:/ scope link

       valid_lft forever preferred_lft forever

[root@LVS2 ~]# ipvsadm

IP Virtual Server version 1.2. (size=)

Prot LocalAddress:Port Scheduler Flags

  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn

TCP  cx--.novalocal:mysql rr persistent

  -> 172.16.2.95:mysql            Route

  -> 172.16.2.160:mysql           Route

  -> 172.16.2.220:mysql           Route

但是其他的机器总是访问不了vip,不知道是云主机不能用keepalived虚拟ip还是啥原因,还没找到,似乎是云服务器的vip需要申请，跟服务商申请。反正就是云服务器跟虚拟机不一样

https://www.cnblogs.com/galengao/articles/7417520.html

//每台主机查一下arp,发现VIP的HWaddress都是incomplete,也就是无法获取mac硬件地址,所以不知道指向那台机器,因此无法ping通,无法访问

[root@cx-- ~]# arp -n

Address                  HWtype  HWaddress           Flags Mask            Iface

172.16.2.1               ether   fa::3e:3d:4d:a0   C                     eth0

10.42.2.0                        (incomplete)                              flannel.

172.16.2.95              ether   fa::3e:dc:a1:c6   C                     eth0

172.16.2.222                     (incomplete)                              eth0

172.16.2.67              ether   fa::3e:2f:b0:e0   C                     eth0

172.17.0.2               ether   ::ac:::   C                     docker0

10.42.1.0                        (incomplete)                              flannel.

172.17.0.4               ether   ::ac:::   C                     docker0

172.16.2.254             ether   fa::3e:de:bd:f9   C                     eth0

172.16.2.234             ether   fa::3e:a3::   C                     eth0

172.16.2.253                     (incomplete)                              eth0

172.17.0.3               ether   ::ac:::   C                     docker0

172.16.2.17              ether   fa::3e:f3:5e:6f   C                     eth0

//清空arp缓存依然不行

[root@LVS1 keepalived]# arp -n|awk '/^[1-9]/{system("arp -d "$1)}'

SIOCDARP(dontpub): Network is unreachable

SIOCDARP(dontpub): Network is unreachable

ipvsadm -lnc

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