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https://www.cnblogs.com/liuyisai/p/5990645.html

一、為什么要使用負載均衡技術？

1、系統高可用性

2、??系統可擴展性

3、??負載均衡能力

LVS+keepalived能很好的實現以上的要求，LVS提供負載均衡，keepalived提供健康檢查，故障轉移，提高系統的可用性！采用這樣的架構以后很容易對現有系統進行擴展，只要在后端添加或者減少realserver，只要更改lvs的配置文件，并能實現無縫配置變更！

二、LVS+Keepalived介紹

1、??LVS

LVS是一個開源的軟件，可以實現LINUX平臺下的簡單負載均衡。LVS是Linux Virtual Server的縮寫，意思是Linux虛擬服務器。目前有三種IP負載均衡技術（VS/NAT、VS/TUN和VS/DR）；八種調度算法（rr,wrr,lc,wlc,lblc,lblcr,dh,sh）。

2、??keepalived

Keepalived?是運行在lvs?之上，它的主要功能是實現真實機的故障隔離及負載均衡器間的失敗切換，提高系統的可用性

三、環境：

四臺服務器，系統全為CentOS6.8：

192.168.2.203 master lvs+keepalived

192.168.2.202 backup lvs+keepalived

192.168.2.204 web1（nginx）

192.168.2.205 web2 （nginx）

vip：192.168.2.13

其中nginx已預裝好，這里不再寫搭建過程

四、搭建并配置

1、分別在backup lvs和master lvs上安裝lvs

1root@bogon src]# yum -y install ipvsadm 2已加載插件：fastestmirror 3設置安裝進程 4Determining fastest mirrors 5epel/metalink? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? |5.4kB00:00 6*base: mirror.lzu.edu.cn 7... ... 8已安裝: 9ipvsadm.x86_640:1.26-4.el6? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 1011作為依賴被安裝:12libnl.x86_640:1.1.4-2.el6? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 1314完畢！

2、把ipvsadm模塊加載進系統

1[root@bogon src]# ipvsadm2IP Virtual Server version1.2.1(size=4096)3Prot LocalAddress:Port Scheduler Flags4-> RemoteAddress:Port? ? ? ? ? Forward Weight ActiveConn InActConn5[root@bogon src]#lsmod|grep ip_vs6ip_vs12689707libcrc32c12461 ip_vs8ipv6336282270ip_vs,ip6t_REJECT,nf_conntrack_ipv6,nf_defrag_ipv6

3、分別在backup lvs和master lvs上安裝keepalived（keepalived官網：http://www.keepalived.org/）

[root@bogon src]#tarzxf keepalived-1.2.24.tar.gz

[root@bogon src]# cd keepalived-1.2.24[root@bogon keepalived-1.2.24]# ./configure --sysconf=/etc --with-kernel-dir=/lib/modules/2.6.32-642.3.1.el6.x86_64/報錯：

configure: error:

? !!! OpenSSL is not properly installed on your system. !!!? !!! Can not include OpenSSL headers files.? ? ? ? ? ? !!!

系統缺少openssl-devel包所致

安裝openssl-devel

root@bogon keepalived-1.2.24]#yum-yinstallopenssl-devel

再次編輯安裝

[root@bogon keepalived-1.2.24]# ./configure --sysconf=/etc --with-kernel-dir=/lib/modules/2.6.32-642.3.1.el6.x86_64/Keepalived configuration------------------------Keepalived version? ? ? : 1.2.24Compiler? ? ? ? ? ? ? ? : gccPreprocessor flags? ? ? : -I/lib/modules/2.6.32-642.3.1.el6.x86_64//includeCompiler flags? ? ? ? ? : -Wall -Wunused -Wstrict-prototypes

Linker flags? ? ? ? ? ? :

Extra Lib? ? ? ? ? ? ? ? : -ldl -lssl -lcrypto

Use IPVS Framework? ? ? : Yes

IPVS use libnl? ? ? ? ? : No

IPVS syncd attributes? ? : No

IPVS 64 bit stats? ? ? ? : No

fwmark socket support? ? : Yes

Use VRRP Framework? ? ? : Yes

Use VRRP VMAC? ? ? ? ? ? : Yes

Use VRRP authentication? : Yes

With ip rules/routes? ? : Yes

SNMP keepalived support? : No

SNMP checker support? ? : No

SNMP RFCv2 support? ? ? : No

SNMP RFCv3 support? ? ? : No

SHA1 support? ? ? ? ? ? : No

Use Debug flags? ? ? ? ? : No

Stacktrace support? ? ? : No

Memory alloc check? ? ? : No

libnl version? ? ? ? ? ? : None

Use IPv4 devconf? ? ? ? : No

Use libiptc? ? ? ? ? ? ? : No

Use libipset? ? ? ? ? ? : No

Build genhash? ? ? ? ? ? : Yes

Build documentation? ? ? : No

[root@bogon keepalived-1.2.24]#make&&makeinstall

[root@bogon keepalived-1.2.24]#ln-s /usr/local/sbin/keepalived /sbin/[root@bogon keepalived-1.2.24]# chkconfig --add keepalived

[root@bogon keepalived-1.2.24]# chkconfig --level35keepalived on

4、配置keepalived

lvs-master的配置文件如下

[root@bogon keepalived-1.2.24]#cat/etc/keepalived/keepalived.conf! Configuration Fileforkeepalivedglobal_defs {　　　　　　#全局配置部分#? notification_email {#email?通知，基本不用此處所以注釋掉#? ? acassen@firewall.loc#? ? failover@firewall.loc#? ? sysadmin@firewall.loc#? }#? notification_email_from Alexandre.Cassen@firewall.loc#? smtp_server192.168.200.1#? smtp_connect_timeout 30router_id LVS_DEVEL#設置lvs的id，在一個網絡內應該是唯一的vrrp_skip_check_adv_addr　　? vrrp_strict? vrrp_garp_interval0? vrrp_gna_interval 0}vrrp_instance VI_1 {　　　　#vrrp實例定義部分? ? state MASTER#設置lvs的狀態，報錯MASTER和BACKUP兩種，必須大寫interface eth1#設置對外服務的接口virtual_router_id60　　#設置虛擬路由標示，這個標示是一個數字，同一個vrrp實例使用唯一標示? ? priority 100　　　　#定義優先級，數字越大優先級越高，在一個vrrp——instance下，master的優先級必須大于backup? ? advert_int 1　　　　#設定master與backup負載均衡器之間同步檢查的時間間隔，單位是秒? ? authentication {　　#設置驗證類型和密碼

? ? ? ? auth_type PASS　　#主要有PASS和AH兩種

? ? ? ? auth_pass 1111　　#驗證密碼，同一個vrrp_instance下MASTER和BACKUP密碼必須相同? ? }

? ? virtual_ipaddress {　　#設置虛擬ip地址，可以設置多個，每行一個

? ? ? ? 192.168.2.13? ? }

}

virtual_server 192.168.2.1380 {　　#設置虛擬服務器，需要指定虛擬ip和服務端口

? ? delay_loop 3#健康檢查時間間隔lb_algo rr?#負載均衡調度算法lb_kind DR#負載均衡轉發規則persistence_timeout 50#設置會話保持時間，對動態網頁非常有用? ? protocol TCP　　　　#指定轉發協議類型，有TCP和UDP兩種

? ? real_server 192.168.2.20480 {　　#配置服務器節點1，需要指定real server的真實IP地址和端口

? ? ? ? weight 1　　　　#設置權重，數字越大權重越高? ? TCP_CHECK { 　　　　#realserver的狀態監測設置部分單位秒

? ? ? ? ? ? connect_timeout 3　　　　#超時時間? ? ? ? ? ? nb_get_retry 3　　　　　　#重試次數? ? ? ? ? ? delay_before_retry 3　　　　#重試間隔? ? ? ? connect_port 80? ? 　　#監測端口

? ? }

}

? ? real_server 192.168.2.20580 {

? ? weight 1? ? TCP_CHECK {

? ? connect_timeout 3? ? nb_get_retry 3? ? delay_before_retry 3? ? connect_port 80? ? ? ? }

? ? }

}

LVS-backup的配置文件如下

[root@bogon keepalived-1.2.24]#cat/etc/keepalived/keepalived.conf! Configuration Filefor keepalived

global_defs {

#? notification_email {

#? ? acassen@firewall.loc

#? ? failover@firewall.loc

#? ? sysadmin@firewall.loc

#? }

#? notification_email_from Alexandre.Cassen@firewall.loc

#? smtp_server 192.168.200.1? smtp_connect_timeout 30? router_id LVS_DEVEL

? vrrp_skip_check_adv_addr

? vrrp_strict

? vrrp_garp_interval 0? vrrp_gna_interval 0}

vrrp_instance VI_1 {

? ? state BACKUP

? ? interface eth1

? ? virtual_router_id 60? ? priority 80? ? advert_int 1? ? authentication {

? ? ? ? auth_type PASS

? ? ? ? auth_pass 1111? ? }

? ? virtual_ipaddress {

? ? ? ? 192.168.2.13? ? }

}

virtual_server 192.168.2.1380 {

? ? delay_loop 3? ? lb_algo rr

? ? lb_kind DR

? ? persistence_timeout 3? ? protocol TCP

? ? real_server 192.168.2.20480 {

? ? ? ? weight 1? ? TCP_CHECK {

? ? ? ? ? ? connect_timeout 3? ? ? ? ? ? nb_get_retry 3? ? ? ? ? ? delay_before_retry 3? ? ? ? connect_port 80? ?

? ? }

}

? ? real_server 192.168.2.20580 {

? ? weight 1? ? TCP_CHECK {

? ? connect_timeout 3? ? nb_get_retry 3? ? delay_before_retry 3? ? connect_port 80? ? ? ? }

? ? }

}

5、realserver的配置

兩臺web服務器都要執行下面腳本

[root@bogon www]#cat/etc/rc.d/init.d/realserver.sh

#!/bin/bash

# description: Config realserver lo and apply noarp

SNS_VIP=192.168.2.13/etc/rc.d/init.d/functions

case"$1"instart)

? ? ? ifconfiglo:0$SNS_VIP netmask255.255.255.255 broadcast $SNS_VIP

? ? ? /sbin/route add -host $SNS_VIP dev lo:0echo"1">/proc/sys/net/ipv4/conf/lo/arp_ignore

? ? ? echo"2">/proc/sys/net/ipv4/conf/lo/arp_announce

? ? ? echo"1">/proc/sys/net/ipv4/conf/all/arp_ignore

? ? ? echo"2">/proc/sys/net/ipv4/conf/all/arp_announce

? ? ? sysctl -p >/dev/null2>&1echo"RealServer Start OK"

? ? ? ;;

stop)

? ? ? ifconfiglo:0 down

? ? ? route del $SNS_VIP >/dev/null2>&1echo"0">/proc/sys/net/ipv4/conf/lo/arp_ignore

? ? ? echo"0">/proc/sys/net/ipv4/conf/lo/arp_announce

? ? ? echo"0">/proc/sys/net/ipv4/conf/all/arp_ignore

? ? ? echo"0">/proc/sys/net/ipv4/conf/all/arp_announce

? ? ? echo"RealServer Stoped"? ? ? ;;*)

? ? ? echo"Usage: $0 {start|stop}"? ? ? exit 1esac

exit 0

[root@bogon www]# /etc/rc.d/init.d/realserver.sh start/etc/rc.d/init.d/realserver.sh: line6: /etc/rc.d/init.d/functions: 權限不夠

RealServer Start OK

[root@bogon www]# ifconfigeth0? ? ? Link encap:Ethernet? HWaddr 00:0C:29:41:71:DF?

? ? ? ? ? inet addr:192.168.12.129Bcast:192.168.12.255Mask:255.255.255.0? ? ? ? ? inet6 addr: fe80::20c:29ff:fe41:71df/64 Scope:Link

? ? ? ? ? UP BROADCAST RUNNING MULTICAST? MTU:1500Metric:1? ? ? ? ? RX packets:728errors:0dropped:0overruns:0frame:0? ? ? ? ? TX packets:98errors:0dropped:0overruns:0carrier:0? ? ? ? ? collisions:0txqueuelen:1000

? ? ? ? ? RX bytes:137311(134.0KiB)? TX bytes:7369(7.1 KiB)

eth1? ? ? Link encap:Ethernet? HWaddr 00:0C:29:41:71:E9?

? ? ? ? ? inet addr:192.168.2.204Bcast:192.168.2.255Mask:255.255.255.0? ? ? ? ? inet6 addr: fe80::20c:29ff:fe41:71e9/64 Scope:Link

? ? ? ? ? UP BROADCAST RUNNING MULTICAST? MTU:1500Metric:1? ? ? ? ? RX packets:119838errors:0dropped:0overruns:0frame:0? ? ? ? ? TX packets:31612errors:0dropped:0overruns:0carrier:0? ? ? ? ? collisions:0txqueuelen:1000

? ? ? ? ? RX bytes:23411786(22.3MiB)? TX bytes:2119106(2.0 MiB)

lo? ? ? ? Link encap:Local Loopback?

? ? ? ? ? inet addr:127.0.0.1Mask:255.0.0.0? ? ? ? ? inet6 addr: ::1/128 Scope:Host

? ? ? ? ? UP LOOPBACK RUNNING? MTU:65536Metric:1? ? ? ? ? RX packets:2errors:0dropped:0overruns:0frame:0? ? ? ? ? TX packets:2errors:0dropped:0overruns:0carrier:0? ? ? ? ? collisions:0txqueuelen:0

? ? ? ? ? RX bytes:182(182.0b)? TX bytes:182(182.0 b)

lo:0? ? ? Link encap:Local Loopback?

? ? ? ? ? inet addr:192.168.2.13Mask:255.255.255.255? ? ? ? ? UP LOOPBACK RUNNING? MTU:65536Metric:1

6、啟動keepalived并進行測試

[root@bogon keepalived-1.2.24]# service keepalived start

正在啟動 keepalived：? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? [確定]

lvs-master

[root@bogon keepalived-1.2.24]#tail-f /var/log/messages

Oct 2101:19:46bogon Keepalived_vrrp[6597]: Sending gratuitous ARP on eth1for192.168.2.13Oct 2101:19:46bogon Keepalived_vrrp[6597]: Sending gratuitous ARP on eth1for192.168.2.13Oct 2101:19:46bogon Keepalived_healthcheckers[6596]: Netlink reflector reports IP192.168.2.13 added

Oct 2101:19:46bogon Keepalived_vrrp[6597]: Sending gratuitous ARP on eth1for192.168.2.13Oct 2101:19:51bogon Keepalived_vrrp[6597]: Sending gratuitous ARP on eth1for192.168.2.13Oct 2101:19:51bogon Keepalived_vrrp[6597]: VRRP_Instance(VI_1) Sending/queueing gratuitous ARPs on eth1for192.168.2.13Oct 2101:19:51bogon Keepalived_vrrp[6597]: Sending gratuitous ARP on eth1for192.168.2.13Oct 2101:19:51bogon Keepalived_vrrp[6597]: Sending gratuitous ARP on eth1for192.168.2.13Oct 2101:19:51bogon Keepalived_vrrp[6597]: Sending gratuitous ARP on eth1for192.168.2.13Oct 2101:19:51bogon Keepalived_vrrp[6597]: Sending gratuitous ARP on eth1for192.168.2.13

[root@bogon keepalived-1.2.24]# ipvsadm -L -n

IP Virtual Server version 1.2.1(size=4096)

Prot LocalAddress:Port Scheduler Flags

? -> RemoteAddress:Port? ? ? ? ? Forward Weight ActiveConn InActConn

TCP? 192.168.2.13:80rr persistent3->192.168.2.204:80Route100->192.168.2.205:80Route100

訪問curl http://192.168.2.13/test.txt

[root@www etc]# curl http://192.168.2.13/test.txtit is web2

關掉web2再次測試

[root@www etc]# curl http://192.168.2.13/test.txtit is web1

查看lvs-master

[root@bogon keepalived-1.2.24]# ipvsadm -L -n

IP Virtual Server version 1.2.1(size=4096)

Prot LocalAddress:Port Scheduler Flags

? -> RemoteAddress:Port? ? ? ? ? Forward Weight ActiveConn InActConn

TCP? 192.168.2.13:80rr persistent3->192.168.2.204:80Route102? ? ? ?

[root@bogon keepalived-1.2.24]#tail-f /var/log/messages

Oct 2101:19:51bogon Keepalived_vrrp[6597]: Sending gratuitous ARP on eth1for192.168.2.13Oct 2101:19:51bogon Keepalived_vrrp[6597]: Sending gratuitous ARP on eth1for192.168.2.13Oct 2101:19:51bogon Keepalived_vrrp[6597]: Sending gratuitous ARP on eth1for192.168.2.13Oct 2101:19:51bogon Keepalived_vrrp[6597]: Sending gratuitous ARP on eth1for192.168.2.13Oct 2101:28:58bogon Keepalived_healthcheckers[6596]: TCP connection to [192.168.2.205]:80 failed.

Oct 2101:29:01bogon Keepalived_healthcheckers[6596]: TCP connection to [192.168.2.205]:80 failed.

Oct 2101:29:01bogon Keepalived_healthcheckers[6596]: Check on service [192.168.2.205]:80failed after1 retry.

Oct 2101:29:01bogon Keepalived_healthcheckers[6596]: Removing service [192.168.2.205]:80from VS [192.168.2.13]:80Oct 2101:29:01bogon Keepalived_healthcheckers[6596]: Remote SMTP server [192.168.200.1]:25 connected.

Oct 2101:29:31bogon Keepalived_healthcheckers[6596]: Timeout reading data to remote SMTP server [192.168.200.1]:25.

已經自動把web2剔除

打開web2再次查看

[root@bogon keepalived-1.2.24]# ipvsadm -L -n

IP Virtual Server version 1.2.1(size=4096)

Prot LocalAddress:Port Scheduler Flags

? -> RemoteAddress:Port? ? ? ? ? Forward Weight ActiveConn InActConn

TCP? 192.168.2.13:80rr persistent3->192.168.2.204:80Route100->192.168.2.205:80Route100? ? ? ?

[root@bogon keepalived-1.2.24]#tail-f /var/log/messages

Oct 2101:19:51bogon Keepalived_vrrp[6597]: Sending gratuitous ARP on eth1for192.168.2.13Oct 2101:28:58bogon Keepalived_healthcheckers[6596]: TCP connection to [192.168.2.205]:80 failed.

Oct 2101:29:01bogon Keepalived_healthcheckers[6596]: TCP connection to [192.168.2.205]:80 failed.

Oct 2101:29:01bogon Keepalived_healthcheckers[6596]: Check on service [192.168.2.205]:80failed after1 retry.

Oct 2101:29:31bogon Keepalived_healthcheckers[6596]: Timeout reading data to remote SMTP server [192.168.200.1]:25.

Oct 2101:31:01bogon Keepalived_healthcheckers[6596]: TCP connection to [192.168.2.205]:80 success.

Oct 2101:31:01bogon Keepalived_healthcheckers[6596]: Adding service [192.168.2.205]:80to VS [192.168.2.13]:80Oct 2101:31:01bogon Keepalived_healthcheckers[6596]: Remote SMTP server [192.168.200.1]:25connected.

恢復后已自動添加進來

關掉lvs master的keepalived

[root@bogon keepalived-1.2.24]# service keepalived stop

停止 keepalived：? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? [確定]

訪問web并查看lvs backup

[root@www etc]# curl http://192.168.2.13/test.txtit is web2

[root@lys2 src]#tail-f /var/log/messages

Oct 2319:03:26lys2 Keepalived_vrrp[13124]: VRRP_Instance(VI_1) Transition to MASTER STATE

Oct 2319:03:27lys2 Keepalived_vrrp[13124]: VRRP_Instance(VI_1) Entering MASTER STATE

Oct 2319:03:27lys2 Keepalived_vrrp[13124]: VRRP_Instance(VI_1) setting protocol VIPs.

Oct 2319:03:27lys2 Keepalived_healthcheckers[13123]: Netlink reflector reports IP192.168.2.13 added

Oct 2319:03:27lys2 Keepalived_vrrp[13124]: Sending gratuitous ARP on eth1for192.168.2.13Oct 2319:03:27lys2 Keepalived_vrrp[13124]: VRRP_Instance(VI_1) Sending/queueing gratuitous ARPs on eth1for192.168.2.13Oct 2319:03:27lys2 Keepalived_vrrp[13124]: Sending gratuitous ARP on eth1for192.168.2.13Oct 2319:03:27lys2 Keepalived_vrrp[13124]: Sending gratuitous ARP on eth1for192.168.2.13Oct 2319:03:27lys2 Keepalived_vrrp[13124]: Sending gratuitous ARP on eth1for192.168.2.13Oct 2319:03:27lys2 Keepalived_vrrp[13124]: Sending gratuitous ARP on eth1for192.168.2.13Oct 2319:03:32lys2 Keepalived_vrrp[13124]: Sending gratuitous ARP on eth1for192.168.2.13Oct 2319:03:32lys2 Keepalived_vrrp[13124]: VRRP_Instance(VI_1) Sending/queueing gratuitous ARPs on eth1for192.168.2.13Oct 2319:03:32lys2 Keepalived_vrrp[13124]: Sending gratuitous ARP on eth1for192.168.2.13Oct 2319:03:32lys2 Keepalived_vrrp[13124]: Sending gratuitous ARP on eth1for192.168.2.13Oct 2319:03:32lys2 Keepalived_vrrp[13124]: Sending gratuitous ARP on eth1for192.168.2.13Oct 2319:03:32lys2 Keepalived_vrrp[13124]: Sending gratuitous ARP on eth1for192.168.2.13

[root@lys2 src]# ip addr1: lo: mtu65536 qdisc noqueue state UNKNOWN

? ? link/loopback00:00:00:00:00:00brd00:00:00:00:00:00? ? inet 127.0.0.1/8 scope host lo

? ? inet6 ::1/128 scope host

? ? ? valid_lft forever preferred_lft forever2: eth0: mtu1500qdisc pfifo_fast state UP qlen1000? ? link/ether00:0c:29:89:0f:e3 brd ff:ff:ff:ff:ff:ff

? ? inet 192.168.144.101/24brd192.168.144.255 scope global eth0

? ? inet6 fe80::20c:29ff:fe89:fe3/64 scope link

? ? ? valid_lft forever preferred_lft forever3: eth1: mtu1500qdisc pfifo_fast state UP qlen1000? ? link/ether00:0c:29:89:0f:ed brd ff:ff:ff:ff:ff:ff

? ? inet 192.168.2.202/24brd192.168.2.255 scope global eth1

? ? inet 192.168.2.13/32 scope global eth1

? ? inet6 fe80::20c:29ff:fe89:fed/64 scope link

? ? ? valid_lft forever preferred_lft forever

可以看到lvs backup已自動切換成master狀態并自動綁定了vip

查看lvs master vip

[root@bogon keepalived-1.2.24]# ip addr1: lo: mtu65536 qdisc noqueue state UNKNOWN

? ? link/loopback00:00:00:00:00:00brd00:00:00:00:00:00? ? inet 127.0.0.1/8 scope host lo

? ? inet6 ::1/128 scope host

? ? ? valid_lft forever preferred_lft forever2: eth0: mtu1500qdisc pfifo_fast state UP qlen1000? ? link/ether00:0c:29:55:4d:7a brd ff:ff:ff:ff:ff:ff

? ? inet 192.168.12.128/24brd192.168.12.255 scope global eth0

? ? inet6 fe80::20c:29ff:fe55:4d7a/64 scope link

? ? ? valid_lft forever preferred_lft forever3: eth1: mtu1500qdisc pfifo_fast state UP qlen1000? ? link/ether00:0c:29:55:4d:84 brd ff:ff:ff:ff:ff:ff

? ? inet 192.168.2.203/24brd192.168.2.255 scope global eth1

? ? inet6 fe80::20c:29ff:fe55:4d84/64 scope link

? ? ? valid_lft forever preferred_lft forever

已自動解除vip

到處全部結束

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Lvs + keepalived + nginx 高可用負載均衡

Lvs + keepalived + nginx 高可用負載均衡

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