Keepalived+LVS-DR模式高可用負載均衡集羣的搭建

時間 2020-01-02

標籤 keepalived+lvs keepalived lvs 模式可用負載均衡集羣搭建欄目負載均衡简体版

原文原文鏈接

主機環境 redhat6.5 64位vim

實驗環境服務端1 ip 172.25.25.113 主機名：server3.example.com 後端

服務端2 ip 172.25.25.114 主機名：server4.example.com服務器

管理端2 ip 172.25.25.112 主機名：server2.example.comide

管理端1 ip 172.25.25.111 主機名：server1.example.comoop

防火牆狀態：關閉測試

虛擬ip（vip）： 172.25.25.200/24spa

前面的博文中已經介紹過將DR添加到高可用集羣（HA）的heartbeat中避免單點故障，本節將介紹將另外一個避免單點故障的方法：將DR添加到HA的keepalived中。keepalived對後端有健康檢查，則在安裝好keepalived以後可直接添加DR。3d

本節將再也不介紹DR的配置，感興趣的可查看前面的博文，本文直接從keeepalived的安裝開始。orm

在Keepalived.org官網可下載leepalived壓縮包（keeepalived對後端有健康檢查）router

1.源碼安裝keepalived

[root@server1 mnt]# ls

keepalived-1.2.24.tar.gz

[root@server1 mnt]# tar zxf keepalived-1.2.24.tar.gz #解壓

keepalived-1.2.24

keepalived-1.2.24.tar.gz

[root@server1 mnt]# cd keepalived-1.2.24

[root@server1 keepalived-1.2.24]# ls

aclocal.m4 ChangeLog CONTRIBUTORS genhash keepalived.spec.in missing

ar-lib compile COPYING INSTALL lib README

AUTHOR configure depcomp install-sh Makefile.am TODO

bin_install configure.ac doc keepalived Makefile.in

[root@server1 keepalived-1.2.24]# ./configure--prefix=/usr/local/keepalived

如有如下錯誤

則安裝

[root@server1 keepalived-1.2.24]# yum installopenssl-devel.x86_64 -y

[root@server1 keepalived-1.2.24]# ./configure--prefix=/usr/local/keepalived

[root@server1 keepalived-1.2.24]# make

[root@server1 keepalived-1.2.24]# make install

[root@server1 keepalived-1.2.24]# cd /usr/local/

[root@server1 local]# ls

bin etc games include keepalived lib lib64 libexec sbin share src

[root@server1 local]# scp -r keepalived/172.25.25.112:/usr/local/

root@172.25.25.112's password:

#做軟鏈接

[root@server1 local]# ln -s/usr/local/keepalived/etc/keepalived/ /etc/ #主配置文件的軟連接

[root@server1 local]# ln -s/usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/ #啓動腳本的軟連接

[root@server1 local]# chmod +x /etc/init.d/keepalived #改變腳本的權限

[root@server1 local]# ln -s/usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/ #配置文件的軟連接

[root@server1 local]# ln -s/usr/local/keepalived/sbin/keepalived /sbin/ #二進制文件的軟連接

[root@server1 local]# /etc/init.d/keepalived start #測試，開啓

Starting keepalived: [ OK ]

[root@server1 local]# /etc/init.d/keepalived stop

Stopping keepalived: [ OK ]

[root@server1 local]#

2.將DR添加到keepalived及測試（管理端）

1.添加DR到keepalived

[root@server1 local]# cd /etc/keepalived/

[root@server1 keepalived]# ls

keepalived.conf samples

[root@server1 keepalived]# vim keepalived.conf #進入主配置文件

1 ! Configuration Filefor keepalived

3 global_defs {

4 notification_email {

5 root@localhost #郵件接受端

6 }

7 notification_email_from keepalived@server1.example.com #郵件發送端

8 smtp_server 127.0.0.1 #本地迴環

9 smtp_connect_timeout 30 #鏈接超時

10 router_id LVS_DEVEL

11 vrrp_skip_check_adv_addr

12 vrrp_strict

13 vrrp_garp_interval 0

14 vrrp_gna_interval 0

15 }

17 vrrp_instance VI_1 {

18 state MASTER #服務端1是master

19 interface eth0 #進入接口eth0

20 virtual_router_id 25 #虛擬路由id（1-254之間）

21 priority 100 #在啓動keepalived服務時，系統會比較priority的值，哪一個值大哪一個就是master

22 advert_int 1

23 authentication {

24 auth_type PASS

25 auth_pass 1111

26 }

27 virtual_ipaddress {

28 172.25.25.200 #虛擬ip‘

29 }

30 }

32 virtual_server172.25.25.200 80 { #虛擬服務

33 delay_loop 6

34 lb_algo rr

35 lb_kind DR #DR

36 # persistence_timeout 50 #超時

37 protocol TCP

39 real_server 172.25.25.113 80 { #真正的服務端

40 weight 1 #權重

41 TCP_CHECK {

42 connect_timeout 3

43 nb_get_retry 3

44 delay_before_retry 3

45 }

46 }

47 real_server 172.25.25.114 80 { #真正的服務端

48 weight 1

49 TCP_CHECK {

50 connect_timeout 3

51 nb_get_retry 3

52 delay_before_retry 3

53 }

54 }

56 }

[root@server1 keepalived]# /etc/init.d/keepalived start #開啓（服務端1）

Starting keepalived: [ OK ]

[root@server1 keepalived]# scp keepalived.conf172.25.25.112:/etc/keepalived/

root@172.25.25.112's password: #將其傳到服務端2

keepalived.conf 100%1049 1.0KB/s 00:00

[root@server2 keepalived]# vim keepalived.conf #進入剛傳到服務端2文件，修改

7 notification_email_from keepalived@server2.example.com#郵件發送段，本機

18 state BACKUP #備服務器

2[root@server2 local]# /etc/init.d/keepalived start #開啓（服務端2）

Starting keepalived: [ OK ]

1 priority 88 #比主的數值小就能夠

2.測試

[root@server1 keepalived]# ipvsadm -l

IP Virtual Server version 1.2.1 (size=4096)

Prot LocalAddress:Port Scheduler Flags

->RemoteAddress:Port ForwardWeight ActiveConn InActConn

TCP 172.25.25.200:httprr

->server3.example.com:http Route 1 0 0

->172.25.25.114:http Route 1 0 0

#刷新以後，服務端2

[root@server1 keepalived]# ip addr show #查看ip，虛擬ip在服務端1

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueuestate UNKNOWN

link/loopback00:00:00:00:00:00 brd 00:00:00:00:00:00

inet 127.0.0.1/8scope host lo

inet6 ::1/128 scopehost

valid_lft foreverpreferred_lft forever

2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdiscpfifo_fast state UP qlen 1000

link/ether 52:54:00:ec:8b:36brd ff:ff:ff:ff:ff:ff

inet 172.25.25.111/24brd 172.25.25.255 scope global eth0

inet 172.25.25.200/32scope global eth0 #虛擬ip

inet6fe80::5054:ff:feec:8b36/64 scope link

valid_lft foreverpreferred_lft forever

當主機keepalived停掉，系統會將服務轉移到備機上；當主機從新打開時，系統會從新讀配置文件，來肯定主機和備機，將服務開啓到主機上

#將服務端1的keepalived停掉，測試

[root@server1 keepalived]# /etc/init.d/keepalived stop

Stopping keepalived: [ OK ]

#服務正常

#刷新以後，服務端2

[root@server1 keepalived]# ip addr show #查看，虛擬ip不在服務端1

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueuestate UNKNOWN

link/loopback00:00:00:00:00:00 brd 00:00:00:00:00:00

inet 127.0.0.1/8scope host lo

inet6 ::1/128 scopehost

valid_lft foreverpreferred_lft forever

2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdiscpfifo_fast state UP qlen 1000

link/ether52:54:00:ec:8b:36 brd ff:ff:ff:ff:ff:ff

inet 172.25.25.111/24brd 172.25.25.255 scope global eth0

inet6fe80::5054:ff:feec:8b36/64 scope link

valid_lft foreverpreferred_lft forever

[root@server2 keepalived]# ip addr show #查看ip虛擬在服務端2

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueuestate UNKNOWN

link/loopback00:00:00:00:00:00 brd 00:00:00:00:00:00

inet 127.0.0.1/8 scopehost lo

inet6 ::1/128 scopehost

valid_lft foreverpreferred_lft forever

2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdiscpfifo_fast state UP qlen 1000

link/ether52:54:00:85:1a:3b brd ff:ff:ff:ff:ff:ff

inet 172.25.25.112/24brd 172.25.25.255 scope global eth0

inet 172.25.25.200/32scope global eth0 #虛擬ip

inet6fe80::5054:ff:fe85:1a3b/64 scope link

valid_lft foreverpreferred_lft forever

#將服務端1的keepalived開啓

[root@server1 keepalived]# /etc/init.d/keepalived start

Starting keepalived: [ OK ]

#服務正常運行

#刷新以後，服務端2

[root@server1 keepalived]# ip addr show #查看虛擬ip，回到服務端1

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueuestate UNKNOWN

link/loopback00:00:00:00:00:00 brd 00:00:00:00:00:00

inet 127.0.0.1/8scope host lo

inet6 ::1/128 scopehost

valid_lft foreverpreferred_lft forever

2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdiscpfifo_fast state UP qlen 1000

link/ether52:54:00:ec:8b:36 brd ff:ff:ff:ff:ff:ff

inet 172.25.25.111/24brd 172.25.25.255 scope global eth0

inet 172.25.25.200/32scope global eth0 #虛擬ip

inet6fe80::5054:ff:feec:8b36/64 scope link

valid_lft foreverpreferred_lft forever

[root@server2 keepalived]# ip addr show #查看，服務端2上沒有虛擬ip

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueuestate UNKNOWN

link/loopback00:00:00:00:00:00 brd 00:00:00:00:00:00

inet 127.0.0.1/8scope host lo

inet6 ::1/128 scopehost

valid_lft foreverpreferred_lft forever

2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdiscpfifo_fast state UP qlen 1000

link/ether52:54:00:85:1a:3b brd ff:ff:ff:ff:ff:ff

inet 172.25.25.112/24brd 172.25.25.255 scope global eth0

inet6fe80::5054:ff:fe85:1a3b/64 scope link

valid_lft foreverpreferred_lft forever

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