副问题[/!--empirenews.page--]
企业营业量较量小的时辰,单台处事器就可以满意营业必要了。可是跟着营业成长,单处事器的题目就凸显出来了:
- 当处事器挂掉时,营业就会间断
- 当营业量增进,单台处事器机能变差,怎样透明的扩展处事器和带宽,增进处事器吞吐量
负载平衡器可以办理以上题目
本文会按照拓扑图,用haproxy和keepalived搭建一个负载平衡器
1 负载平衡器拓扑图
2 筹备
2.1 筹备情形
筹备5台CentOS7.3主机和一个VIP地点:
VIP: 192.168.1.100
lb1(默以为主): 192.168.1.101
lb2(默以为备): 192.168.1.102
s1: 192.168.1.2
s2: 192.168.1.3
s3: 192.168.1.4
2.2 主机设置
2.2.1 全部主机上封锁防火墙
- systemctl stop firewalld
- systemctl disable firewalld
2.2.2 全部主机封锁selinux
- setenforce 0
- vi /etc/selinux/config
- SELINUX=disabled
2.3 安装haproxy和keepalived
lb1和lb2上安装haproxy和keepalived
- yum install haproxy keepalived -y
2.4 安装nginx(有其他后端测措施,可省略此步)
s1 s2 s3上安装nginx,目标是把nginx作为后端,假若有其他后端措施,这一步可以省略
- yum install epel-release -y
- yum install nginx -y
2.3 设置keepalived
KeepAlived是基于VRRP(Virtual Router Redundancy Protocol,假造路由冗余协议)实现的一个高可用方案,通过VIP(假造IP)和心跳检测来实现高可用
Keepalived有两个脚色,Master和Backup。一样平常会是1个Master,多个Backup。
Master会绑定VIP到本身网卡上,对外提供处事。Master和Backup会按时确定对方状态,当Master不行用的时辰,Backup会关照网关,并把VIP绑定到本身的网卡上,实现处事不间断,高可用
2.3.1 设置Master
- ! Configuration File for keepalived
-
- global_defs {
- # 关照邮件处事器的设置
- notification_email {
- # 当master失去VIP或则VIP的时辰,会发一封关照邮件到your-email@qq.com
- your-email@qq.com
- }
- # 发件人信息
- notification_email_from keepalived@qq.com
- # 邮件处事器地点
- smtp_server 127.0.0.1
- # 邮件处事器超时时刻
- smtp_connect_timeout 30
- # 邮件TITLE
- router_id LVS_DEVEL
- }
-
- vrrp_instance VI_1 {
- # 主机: MASTER
- # 备机: BACKUP
- state MASTER
- # 实例绑定的网卡, 用ip a呼吁查察网卡编号
- interface eno16777984
- # 假造路由标识,这个标识是一个数字(1-255),在一个VRRP实例中主备处事器ID必需一样
- virtual_router_id 88
- # 优先级,数字越大优先级越高,在一个实例中主处事器优先级要高于备处事器
- priority 100
- # 主备之间同步搜查的时距离断单元秒
- advert_int 1
- # 验证范例和暗码
- authentication {
- # 验证范例有两种 PASS和HA
- auth_type PASS
- # 验证暗码,在一个实例中主备暗码保持一样
- auth_pass 11111111
- }
- # 假造IP地点,可以有多个,每行一个
- virtual_ipaddress {
- 192.168.1.100
- }
- }
-
- virtual_server 192.168.1.100 443 {
- # 康健搜查时距离断
- delay_loop 6
- # 调治算法
- # Doc: http://www.keepalived.org/doc/scheduling_algorithms.html
- # Round Robin (rr)
- # Weighted Round Robin (wrr)
- # Least Connection (lc)
- # Weighted Least Connection (wlc)
- # Locality-Based Least Connection (lblc)
- # Locality-Based Least Connection with Replication (lblcr)
- # Destination Hashing (dh)
- # Source Hashing (sh)
- # Shortest Expected Delay (seq)
- # Never Queue (nq)
- # Overflow-Connection (ovf)
- lb_algo rr
- lb_kind NAT
- persistence_timeout 50
- protocol TCP
- # 通过调治算法把Master切换到真实的负载平衡处事器上
- # 真实的主机遇按期确定举办康健搜查,假如MASTER不行用,则切换到备机上
- real_server 192.168.1.101 443 {
- weight 1
- TCP_CHECK {
- # 毗连超端口
- connect_port 443
- # 毗连超时时刻
- connect_timeout 3
- }
- }
- real_server 192.168.1.102 443 {
- weight 1
- TCP_CHECK {
- connect_port 443
- connect_timeout 3
- }
- }
- }
2.3.2 设置BACKUP
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