负载均衡集群LVS实战篇

Posted 2020-07-25

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Keepalived+LVS的高可用集群系统

一.拓扑图结构：

二.Keepalived的安装

1.主服务器的安装

[[email protected] ~]# wget http://www.keepalived.org/software/keepalived-1.2.20.tar.gz

[[email protected] ~]# tar -zxvf keepalived-1.2.20.tar.gz

[[email protected] ~]# cd keepalived-1.2.20/

[[email protected] keepalived-1.2.20]# ./configure --prefix=/usr/local/keepalived

configure: error:

!!! OpenSSL is not properly installed on your system. !!!

!!! Can not include OpenSSL headers files. !!!

[[email protected] keepalived-1.2.20]# yum -y install openssl-devel libnl-devel libnfnetlink-devel ipvsadm

[[email protected] keepalived-1.2.20]# ./configure --prefix=/usr/local/keepalived

Keepalived configuration

------------------------

Keepalived version : 1.2.20

Compiler : gcc

Compiler flags : -g -O2 -DFALLBACK_LIBNL1

Extra Lib : -lssl -lcrypto -lcrypt -lnl

Use IPVS Framework : Yes

IPVS sync daemon support : Yes

IPVS use libnl : Yes

fwmark socket support : Yes

Use VRRP Framework : Yes

Use VRRP VMAC : Yes

Use VRRP authentication : Yes

SNMP keepalived support : No

SNMP checker support : No

SNMP RFCv2 support : No

SNMP RFCv3 support : No

SHA1 support : No

Use Debug flags : No

libnl version : 1

Use IPv4 devconf : No

Use libiptc : No

Use libipset : No

[[email protected] keepalived-1.2.20]# make && make install

[[email protected] keepalived-1.2.20]# ln -s /usr/local/keepalived/sbin/keepalived /usr/bin/keepalived

[[email protected] keepalived-1.2.20]# cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/keepalived

[[email protected] keepalived-1.2.20]# chmod 755 /etc/init.d/keepalived

[[email protected] keepalived-1.2.20]# chkconfig keepalived on

[[email protected] keepalived-1.2.20]# vim /etc/init.d/keepalived

# Source configuration file (we set KEEPALIVED_OPTIONS there)

. /etc/sysconfig/keepalived

改为：

# Source configuration file (we set KEEPALIVED_OPTIONS there)

. /usr/local/keepalived/etc/sysconfig/keepalived

[[email protected] keepalived-1.2.20]# mkdir /etc/keepalived

[[email protected] keepalived-1.2.20]# ln -s /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf

[[email protected] keepalived-1.2.20]# service keepalived restart

2.主服务器配置文件

[[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 LVS_DEVEL

}

vrrp_instance VI_1 {

state MASTER

interface eno16777736

virtual_router_id 51

priority 100

advert_int 1

authentication {

auth_type PASS

auth_pass 1111

}

virtual_ipaddress {

192.168.1.100

}

virtual_server 192.168.1.100 80 {

delay_loop 6

lb_algo rr

lb_kind DR

persistence_timeout 50

protocol TCP

real_server 192.168.1.30 80 {

weight 1

TCP_CHECK {

connect_port 80

connect_timeout 3

nb_get_retry 3

delay_before_retry 3

}

real_server 192.168.1.40 80 {

weight 1

TCP_CHECK {

connect_port 80

connect_timeout 3

nb_get_retry 3

delay_before_retry 3

}

3.配置 IPVS

3.1.开启IP转发功能

[[email protected] /]# echo 1 >/proc/sys/net/ipv4/ip_forward 默认是0，关闭ip转发；这里需要开启，所以设置值为1。

3.2.配置重定向

[[email protected] /]# echo "0" >/proc/sys/net/ipv4/ip_forward

[[email protected] /]# echo "1" >/proc/sys/net/ipv4/conf/all/send_redirects

[[email protected] /]# echo "1" >/proc/sys/net/ipv4/conf/default/send_redirects

[[email protected] /]# echo "1" >/proc/sys/net/ipv4/conf/eth0/send_redirects

3.3.清除ipvsadm表

[[email protected] /]# ipvsadm –C

3.4.使用ipvsadm安装web服务

[[email protected] /]# ipvsadm -A -t 192.168.1.100:80-s rr

3.5.增加二台web服务器

[[email protected] /]# ipvsadm -a -t 192.168.1.100:80 -r 192.168.1.30:80 -m -w 1

[[email protected] /]# ipvsadm -a -t 192.168.1.100:80 -r 192.168.1.40:80 -m -w 1

3.6查看结果

[[email protected] ~]# ipvsadm -L -n

IP Virtual Server version 1.2.1 (size=4096)

Prot LocalAddress:Port Scheduler Flags

-> RemoteAddress:Port Forward Weight ActiveConn InActConn

TCP 192.168.1.100:80 rr

-> 192.168.1.30:80 Route 1 0 1

-> 192.168.1.40:80 Route 1 0 0

[[email protected] keepalived-1.2.20]# service keepalived restart

4.主服务器IP查看

[[email protected] /]# ip add

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN

link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00

inet 127.0.0.1/8 scope host lo