集群构件图：
1626159240(1).png
1626163579(1).jpg
1.实验环境准备：
1.准备4台centos7的虚拟机，如上图所示，并在所有节点上关闭防火墙和selinux。
2.四台虚拟机上都安装好nginx
yum install -y nginx //安装nginx
2.配置两台web服务器：
vim /usr/share/nginx/hrml/index.html
编辑index.html的内容,分别修改为web01_10.10.10.13
和web02_10.10.10.14
。
systemctl start nginx //启动nginx
systemctl enable nginx //设置开机启动nginx
浏览器上测试，分别输入10.10.10.13和10.10.10.14出现如下界面：
1626165001(1).png
1626165017(1).png
3.配置两台LB服务器
vim /etc/nginx/nginx.conf //编辑nginx配置文件
# For more information on configuration, see:
# * Official English Documentation: http://nginx.org/en/docs/
# * Official Russian Documentation: http://nginx.org/ru/docs/
user nginx;
worker_processes auto;
error_log /var/log/nginx/error.log;
pid /run/nginx.pid;
# Load dynamic modules. See /usr/share/doc/nginx/README.dynamic.
include /usr/share/nginx/modules/*.conf;
events {
worker_connections 1024;
}
http {
log_format main '$remote_addr - $remote_user [$time_local] "$request" '
'$status $body_bytes_sent "$http_referer" '
'"$http_user_agent" "$http_x_forwarded_for"';
access_log /var/log/nginx/access.log main;
sendfile on;
tcp_nopush on;
tcp_nodelay on;
keepalive_timeout 65;
types_hash_max_size 4096;
include /etc/nginx/mime.types;
default_type application/octet-stream;
# Load modular configuration files from the /etc/nginx/conf.d directory.
# See http://nginx.org/en/docs/ngx_core_module.html#include
# for more information.
include /etc/nginx/conf.d/*.conf;
upstream backend {
server 10.10.10.13:80 weight=1 max_fails=3 fail_timeout=20s;
server 10.10.10.14:80 weight=1 max_fails=3 fail_timeout=20s;
}
server {
listen 80;
listen [::]:80;
server_name _;
root /usr/share/nginx/html;
location /{
proxy_pass http://backend;
proxy_set_header host $host;
proxy_set_header X-Forwarded-For $remote_addr;
}
# Load configuration files for the default server block.
include /etc/nginx/default.d/*.conf;
error_page 404 /404.html;
location = /404.html {
}
error_page 500 502 503 504 /50x.html;
location = /50x.html {
}
}
# Settings for a TLS enabled server.
#
# server {
# listen 443 ssl http2;
# listen [::]:443 ssl http2;
# server_name _;
# root /usr/share/nginx/html;
#
# ssl_certificate "/etc/pki/nginx/server.crt";
# ssl_certificate_key "/etc/pki/nginx/private/server.key";
# ssl_session_cache shared:SSL:1m;
# ssl_session_timeout 10m;
# ssl_ciphers HIGH:!aNULL:!MD5;
# ssl_prefer_server_ciphers on;
#
# # Load configuration files for the default server block.
# include /etc/nginx/default.d/*.conf;
#
# error_page 404 /404.html;
# location = /40x.html {
# }
#
# error_page 500 502 503 504 /50x.html;
# location = /50x.html {
# }
# }
}
微信图片编辑_20210713164601.jpg
systemctl start nginx //启动nginx
systemctl enable nginx //设置开机启动nginx
4.在两台LB服务器节点上安装keepalived：
yum install -y keepalived //安装keepalived
5.配置LB-01节点：
vim /etc/keepalived/keepalived.conf //编辑keepalived配置文件
! Configuration File for keepalived
global_defs {
notification_email {
[email protected]
[email protected]
[email protected]
}
notification_email_from [email protected]
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 MASTER
interface ens33
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
10.10.10.100/24 dev ens33 label ens33:1
}
}
virtual_server 192.168.200.100 443 {
delay_loop 6
lb_algo rr
lb_kind NAT
persistence_timeout 50
protocol TCP
real_server 192.168.201.100 443 {
weight 1
SSL_GET {
url {
path /
digest ff20ad2481f97b1754ef3e12ecd3a9cc
}
url {
path /mrtg/
digest 9b3a0c85a887a256d6939da88aabd8cd
}
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
}
virtual_server 10.10.10.2 1358 {
delay_loop 6
lb_algo rr
lb_kind NAT
persistence_timeout 50
protocol TCP
sorry_server 192.168.200.200 1358
real_server 192.168.200.2 1358 {
weight 1
HTTP_GET {
url {
path /testurl/test.jsp
digest 640205b7b0fc66c1ea91c463fac6334d
}
url {
path /testurl2/test.jsp
digest 640205b7b0fc66c1ea91c463fac6334d
}
url {
path /testurl3/test.jsp
digest 640205b7b0fc66c1ea91c463fac6334d
}
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
real_server 192.168.200.3 1358 {
weight 1
HTTP_GET {
url {
path /testurl/test.jsp
digest 640205b7b0fc66c1ea91c463fac6334c
}
url {
path /testurl2/test.jsp
digest 640205b7b0fc66c1ea91c463fac6334c
}
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
}
virtual_server 10.10.10.3 1358 {
delay_loop 3
lb_algo rr
lb_kind NAT
persistence_timeout 50
protocol TCP
real_server 192.168.200.4 1358 {
weight 1
HTTP_GET {
url {
path /testurl/test.jsp
digest 640205b7b0fc66c1ea91c463fac6334d
}
url {
path /testurl2/test.jsp
digest 640205b7b0fc66c1ea91c463fac6334d
}
url {
path /testurl3/test.jsp
digest 640205b7b0fc66c1ea91c463fac6334d
}
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
real_server 192.168.200.5 1358 {
weight 1
HTTP_GET {
url {
path /testurl/test.jsp
digest 640205b7b0fc66c1ea91c463fac6334d
}
url {
path /testurl2/test.jsp
digest 640205b7b0fc66c1ea91c463fac6334d
}
url {
path /testurl3/test.jsp
digest 640205b7b0fc66c1ea91c463fac6334d
}
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
}
微信图片编辑_20210713172529.jpg
systemctl start keepalived //启动keepalived
systemctl enable keepalived //设置开机启动keepalived
ip a //查看ip，会发现多出了VIP 10.10.10.100
1626168823(1).png
6.配置LB-02节点：
vim /etc/keepalived/keepalived.conf //编辑keepalived配置文件
微信图片编辑_20210713174156.jpg
systemctl start keepalived //启动keepalived
systemctl enable keepalived //设置开机启动keepalived
ip a //查看IP，此时备节点不会有VIP（只有当主挂了的时候，VIP才会飘到备节点）
1626169420(1).png
浏览器上测试,输入10.10.10.100不断刷新，会轮询访问两个web服务器
1626169640(1).png
1626169648(1).png
当其中主LB服务器挂掉，另外一个辅LB服务器就会接替工作