Docker 구성요소 / 접근 방법

Docker 구성요소 / 접근 방법

• 호스트에서 Docker 브리지 네트워크를 통해 웹 서버 컨테이너에 접근
  • 도커엔진 기본 : 172.17 변경 불가
• 웹 서버와 애플리케이션 서버(예: 톰캣)가 서로 다른 포트 번호를 사용하는 이유
  • 충돌을 피하고 역할을 명확하게 구분하기 위해 통상적으로 쓰는 번호 사용 → 애초에 이미지가 다름

• IP를 확인해보았다.

--localhost addr
root@docker:~# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
 
--host ubuntu  
2: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 08:00:27:14:e0:9a brd ff:ff:ff:ff:ff:ff
    inet 10.100.0.105/24 brd 10.100.0.255 scope global noprefixroute enp0s3
       valid_lft forever preferred_lft forever
    inet6 fe80::b7d4:f0bc:72a6:91af/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever
       
--bridge
3: docker0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default 
    link/ether 02:42:71:11:45:b4 brd ff:ff:ff:ff:ff:ff
    inet 172.17.0.1/16 brd 172.17.255.255 scope global docker0
       valid_lft forever preferred_lft forever
    inet6 fe80::42:71ff:fe11:45b4/64 scope link 
       valid_lft forever preferred_lft forever
11: veth54916c0@if10: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master docker0 state UP group default 
    link/ether da:e2:38:d0:be:75 brd ff:ff:ff:ff:ff:ff link-netnsid 0
    inet6 fe80::d8e2:38ff:fed0:be75/64 scope link 
       valid_lft forever preferred_lft forever

 

 

임의의 IP로 컨테이너 생성

• 도커 엔진 기본 : 172.17 변경불가
• 근데 다른 아이피 쓰고 싶으면 user defined bridge network 생성

root@docker:~# docker network create --driver bridge --subnet 192.168.100.0/24 --gateway 192.168.100.254 mynet
0c078cb1cfcfeb80aa6152214b22236b1cd4b64aaa396856b10503b3e5f39413

root@docker:~# docker network ls
NETWORK ID     NAME      DRIVER    SCOPE
792ca527876d   bridge    bridge    local
53f7b047ac80   host      host      local
0c078cb1cfcf   mynet     bridge    local
9d8171228e89   none      null      local


root@docker:~# docker run -d --name appjs --net mynet --ip 192.168.100.100 -p 8080:8080 sinhye/nodejs

root@docker:~# docker ps
CONTAINER ID   IMAGE                        COMMAND                   CREATED         STATUS         PORTS                                               NAMES
dd9028c958e3   powermvp/marvel-collection   "nginx -g 'daemon of…"   6 minutes ago   Up 6 minutes   80/tcp, 0.0.0.0:8080->8080/tcp, :::8080->8080/tcp   appjs


root@docker:~# docker inspect mynet
"Config": [
                {
                    "Subnet": "192.168.100.0/24",
                    "Gateway": "192.168.100.254"
                }
                 "IPv4Address": "192.168.100.100/24",

 

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