centos stream 8 安装haproxy

准备工作：

  需要安装docker,本次docker用于安装httpd,用于模拟两台服务器。
  最终用于验证haproxy是否安装成功
  
  centos stream 8安装docker的教程地址： 
  https://blog.csdn.net/qq_39009944/article/details/123632823?spm=1001.2014.3001.5501

1.docker安装httpd

[root@localhost ~]# docker pull httpd:2.4.37-alpine
2.4.37-alpine: Pulling from library/httpd
cd784148e348: Pull complete 
3c1a9ba32ed5: Pull complete 
ad2301f3cf66: Pull complete 
bdb52bc2ac77: Pull complete 
d5b4d0f09975: Pull complete 
Digest: sha256:b48b1fd7d417477f69b6cba46fd7c83a7644ebbff600c0a89e3a95b1ab2cef7e
Status: Downloaded newer image for httpd:2.4.37-alpine
docker.io/library/httpd:2.4.37-alpine

1.docker运行两个httpd

[root@localhost ~]# docker run --name web1 -d httpd:2.4.37-alpine
6e205fe7a310ca93423da22db5ab4d175cb624f5fc0814433f71a85fab312cbb
[root@localhost ~]# docker run --name web2 -d httpd:2.4.37-alpine
71709b22733db3eefc593be56c4387b2f8fea6e47d919ee8c7917b3a4611857b

2.查看两个httpd模拟服务器的ip,用于后面测试haproxy的反向代理

[root@localhost ~]# docker exec -it web1 /bin/bash
bash-4.4# ifconfig
eth0      Link encap:Ethernet  HWaddr 02:42:AC:11:00:02  
          inet addr:172.17.0.2  Bcast:172.17.255.255  Mask:255.255.0.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:18 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:1532 (1.4 KiB)  TX bytes:0 (0.0 B)

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
[root@localhost ~]# docker exec -it web1 /bin/bash
bash-4.4# ifconfig
eth0      Link encap:Ethernet  HWaddr 02:42:AC:11:00:02  
          inet addr:172.17.0.2  Bcast:172.17.255.255  Mask:255.255.0.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:18 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:1532 (1.4 KiB)  TX bytes:0 (0.0 B)

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

bash-4.4# cd htdocs/
bash-4.4# ls
index.html
bash-4.4# echo 'web1' > index.html
bash-exit


[root@localhost ~]# docker exec -it web2 /bin/bash
bash-4.4# ifconfig
eth0      Link encap:Ethernet  HWaddr 02:42:AC:11:00:03  
          inet addr:172.17.0.3  Bcast:172.17.255.255  Mask:255.255.0.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:12 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:936 (936.0 B)  TX bytes:0 (0.0 B)

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

/usr/local/apache2
bash-4.4#  cd htdocs/
bash-4.4# ls
index.html
bash-4.4# echo 'web2' > index.html
bash-4.4# exit

3.访问容器中的两个站点

[root@localhost ~]# curl 172.17.0.2
web1
[root@localhost ~]# curl 172.17.0.3
web2

4.安装haproxy

[root@localhost ~]# yum -y install haproxy

5.配置haproxy的配置文件

[root@localhost ~]# cd /etc/haproxy
[root@localhost haproxy]# ls
haproxy.cfg
[root@localhost haproxy]# cp haproxy.cfg haproxy.cfg.bk
[root@localhost haproxy]# vi haproxy.cfg

6.配置haproxy 主机的80端口来代理 两台站点的url

frontend myweb
    bind *:80
    default_backend websrvs


backend websrvs
    balance     roundrobin
    server  web1 172.17.0.2:80 check
    server  web2 172.17.0.3:80 check

7.启动haproxy

[root@localhost haproxy]# systemctl start haproxy
[root@localhost haproxy]# systemctl status haproxy
● haproxy.service - HAProxy Load Balancer
   Loaded: loaded (/usr/lib/systemd/system/haproxy.service; disabled; vendor preset: disabled)
   Active: active (running) since Mon 2022-03-21 14:05:53 CST; 5s ago
  Process: 4892 ExecStartPre=/usr/sbin/haproxy -f $CONFIG -c -q $OPTIONS (code=exited, status=0/SUCCESS)
 Main PID: 4894 (haproxy)
    Tasks: 2 (limit: 23634)
   Memory: 2.4M
   CGroup: /system.slice/haproxy.service
           ├─4894 /usr/sbin/haproxy -Ws -f /etc/haproxy/haproxy.cfg -p /run/haproxy.pid
           └─4897 /usr/sbin/haproxy -Ws -f /etc/haproxy/haproxy.cfg -p /run/haproxy.pid

Mar 21 14:05:53 localhost.localdomain systemd[1]: Starting HAProxy Load Balancer...
Mar 21 14:05:53 localhost.localdomain systemd[1]: Started HAProxy Load Balancer.
[root@localhost haproxy]# netstat -nptl | grep -w 80
tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN      4897/haproxy  

7.验证haproxy是否代理成功，这里我就不在用其他虚拟机来curl了，直接在windows 的cmd窗口里面验证了

C:\Users\admin>curl 192.168.0.120
web1

C:\Users\admin>curl 192.168.0.120
web2