Docker 네트워크 실습 :: HAproxy 구성

<실습5 :: HAproxy 구성>

• HAproxy란?
• 실제 서버 앞단에 존재하며 서버로 오는 요청을 대신 받아 뒷단의 서버에 전달하고 결과를 리턴받아 요청한 곳에 다시 전달하는 역할
• 리버스프록시를 기반으로 한 L4, L7 소프트웨어 로드밸런서

1. 네트워크 생성 (proxy-net)

ubuntu@host1:~/Labs/ch05$ docker network create proxy-net
1ab9e69cadd92c6c5a87e622e99b8383d715986a150275c3d69e1a576060a56a

 

<네트워크 생성 확인>

ubuntu@host1:~/Labs/ch05$ docker network ls
NETWORK ID     NAME        DRIVER    SCOPE
711070d16ea3   bridge      bridge    local
10ae368d91ff   han-net     bridge    local
a10c647d79d1   host        host      local
2785de26c8d7   none        null      local
**1ab9e69cadd9   proxy-net   bridge    local**

 

<라우트 설정 확인>

ubuntu@host1:~/Labs/ch05$ route
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
default         _gateway        0.0.0.0         UG    100    0        0 enp0s3
default         192.168.56.2    0.0.0.0         UG    20101  0        0 enp0s8
10.0.2.0        0.0.0.0         255.255.255.0   U     100    0        0 enp0s3
link-local      0.0.0.0         255.255.0.0     U     1000   0        0 enp0s8
172.17.0.0      0.0.0.0         255.255.0.0     U     0      0        0 docker0
172.18.0.0      0.0.0.0         255.255.0.0     U     0      0        0 br-10ae368d91ff
**172.19.0.0      0.0.0.0         255.255.0.0     U     0      0        0 br-1ab9e69cadd9**
192.168.56.0    0.0.0.0         255.255.255.0   U     101    0        0 enp0s8

 

2. 컨테이너 생성

ubuntu@host1:~/Labs/ch05$ docker run -d -p 6001:5678 --net=proxy-net --name=echo-web1  hashicorp/ht
tp-echo -text="Webserver1"
ad0f99349e524b2c3e58270a61eb9e8915ae83158fc009872507bac96b089f34
ubuntu@host1:~/Labs/ch05$ docker run -d -p 6002:5678 --net=proxy-net --name=echo-web2 hashicorp/htt
p-echo -text="Webserver2"
e5354212c154bd6af108b09721f776b6df8f41a194aa96aa7cb50269b9b7d240
ubuntu@host1:~/Labs/ch05$ docker run -d -p 6003:5678 --net=proxy-net --name=echo-web3 hashicorp/htt
p-echo -text="Webserver3"
b0cd8ddc0e5cae5e25aa8ff0e6664eb765590a456a2022d26b83c7ffc05d4b09
ubuntu@host1:~/Labs/ch05$ docker container ps

<상태확인>

• echo-web1 / echo-web2 / echo-web3

ubuntu@host1:~/Labs/ch05$ docker container ps
CONTAINER ID   IMAGE                 COMMAND                   CREATED          STATUS          PORTS                                       NAMES
**b0cd8ddc0e5c   hashicorp/http-echo   "/http-echo -text=We…"   3 seconds ago    Up 2 seconds    0.0.0.0:6003->5678/tcp, :::6003->5678/tcp   echo-web3
e5354212c154   hashicorp/http-echo   "/http-echo -text=We…"   14 seconds ago   Up 14 seconds   0.0.0.0:6002->5678/tcp, :::6002->5678/tcp   echo-web2
ad0f99349e52   hashicorp/http-echo   "/http-echo -text=We…"   31 seconds ago   Up 31 seconds   0.0.0.0:6001->5678/tcp, :::6001->5678/tcp   echo-web1**
9a8418c7ee8e   nginx:1.25.0-alpine   "/docker-entrypoint.…"   32 minutes ago   Up 20 minutes   0.0.0.0:5000->80/tcp, :::5000->80/tcp       proxy-container
4e49879f5e7f   nginx                 "/docker-entrypoint.…"   2 hours ago      Up 2 hours      0.0.0.0:8003->80/tcp, :::8003->80/tcp       alb-node03
5616dd359296   nginx                 "/docker-entrypoint.…"   2 hours ago      Up 2 hours      0.0.0.0:8002->80/tcp, :::8002->80/tcp       alb-node02
ccd6c942f9f5   nginx                 "/docker-entrypoint.…"   2 hours ago      Up 2 hours      0.0.0.0:8001->80/tcp, :::8001->80/tcp       alb-node01

 

3. haproxy.cfg 편집

ubuntu@host1:~/Labs/ch05$ vi haproxy.cfg

<vi 편집내용>

global
  stats socket /var/run/api.sock user haproxy group haproxy mode 660 level admin expose-fd listeners
  log stdout format raw local0 info

defaults
  mode http
  timeout client 10s
  timeout connect 5s
  timeout server 10s
  timeout http-request 10s
  log global

frontend stats
  bind *:8404
  stats enable
  stats uri /
  stats refresh 10s

frontend myfrontend
  bind :80
  default_backend webservers

**backend webservers
  server s1 echo-web1:5678 check
  server s2 echo-web2:5678 check
  server s3 echo-web3:5678 check**

 

<컨테이너 생성>

ubuntu@host1:~/Labs/ch05$ docker container run -d --name=haproxy-container --net=proxy-net -p 80:80 -p 8404:8404 -v $(pwd):/usr/local/etc/haproxy:ro haproxytech/haproxy-alpine:2.5
Unable to find image 'haproxytech/haproxy-alpine:2.5' locally
2.5: Pulling from haproxytech/haproxy-alpine
96526aa774ef: Pull complete 
25597ce8cc3a: Pull complete 
356dd0b52d3e: Pull complete 
f528cddf9d74: Pull complete 
cf680ef11bb3: Pull complete 
Digest: sha256:5cecad80d3e517f764d4801039d63482260cf40697aa11607c618889c7f3531e
Status: Downloaded newer image for haproxytech/haproxy-alpine:2.5
a5ba66a07e2408352f877fa8fca545a2654e8421de3296f735472d171f95ba6a

<컨테이너 생성 결과 확인>

ubuntu@host1:~/Labs/ch05$ docker container ps
CONTAINER ID   IMAGE                            COMMAND                   CREATED          STATUS          PORTS                                                                          NAMES
a5ba66a07e24   haproxytech/haproxy-alpine:2.5   "/docker-entrypoint.…"   56 seconds ago   Up 54 seconds   0.0.0.0:80->80/tcp, :::80->80/tcp, 0.0.0.0:8404->8404/tcp, :::8404->8404/tcp   haproxy-container
b0cd8ddc0e5c   hashicorp/http-echo              "/http-echo -text=We…"   27 minutes ago   Up 27 minutes   0.0.0.0:6003->5678/tcp, :::6003->5678/tcp                                      echo-web3
e5354212c154   hashicorp/http-echo              "/http-echo -text=We…"   27 minutes ago   Up 27 minutes   0.0.0.0:6002->5678/tcp, :::6002->5678/tcp                                      echo-web2
ad0f99349e52   hashicorp/http-echo              "/http-echo -text=We…"   27 minutes ago   Up 27 minutes   0.0.0.0:6001->5678/tcp, :::6001->5678/tcp                                      echo-web1
9a8418c7ee8e   nginx:1.25.0-alpine              "/docker-entrypoint.…"   59 minutes ago   Up 47 minutes   0.0.0.0:5000->80/tcp, :::5000->80/tcp                                          proxy-container
4e49879f5e7f   nginx                            "/docker-entrypoint.…"   3 hours ago      Up 3 hours      0.0.0.0:8003->80/tcp, :::8003->80/tcp                                          alb-node03
5616dd359296   nginx                            "/docker-entrypoint.…"   3 hours ago      Up 3 hours      0.0.0.0:8002->80/tcp, :::8002->80/tcp                                          alb-node02
ccd6c942f9f5   nginx                            "/docker-entrypoint.…"   3 hours ago      Up 3 hours      0.0.0.0:8001->80/tcp, :::8001->80/tcp                                          alb-node01

 

<컨테이너 가동 확인>

1. 192.168.56.101:8404 접속해 컨테이너 가동 확인

2. curl localhost로 결과 확인

ubuntu@host1:~/Labs/ch05$ curl localhost
Webserver1
ubuntu@host1:~/Labs/ch05$ curl localhost
Webserver2
ubuntu@host1:~/Labs/ch05$ curl localhost
Webserver3
ubuntu@host1:~/Labs/ch05$ curl localhost
Webserver1
ubuntu@host1:~/Labs/ch05$ curl localhost
Webserver2
ubuntu@host1:~/Labs/ch05$ curl localhost
Webserver3
ubuntu@host1:~/Labs/ch05$ curl localhost
Webserver1
ubuntu@host1:~/Labs/ch05$ curl localhost
Webserver2
ubuntu@host1:~/Labs/ch05$ curl localhost
Webserver3
ubuntu@host1:~/Labs/ch05$ curl localhost
Webserver1
ubuntu@host1:~/Labs/ch05$ curl localhost
Webserver2
ubuntu@host1:~/Labs/ch05$ curl localhost
Webserver3