Example | Notion

**https://docs.docker.com/engine/install/ubuntu/**
수업에서 쓰는 ubuntu는 20.04버전 링크 보고 설치하라는 대로 하면 됨

root@ubuntu:~# sudo apt-get update

Hit:1 <http://kr.archive.ubuntu.com/ubuntu> focal InRelease
Hit:2 <http://kr.archive.ubuntu.com/ubuntu> focal-updates InRelease
Hit:3 <http://kr.archive.ubuntu.com/ubuntu> focal-backports InRelease
Hit:4 <http://kr.archive.ubuntu.com/ubuntu> focal-security InRelease
Reading package lists... Done

root@ubuntu:~# curl -ssL <https://get.docker.com/> | bash

공식 문서에서 명령어 치라는 대로 쳐도 되고 script 파일로 해도 됨

root@ubuntu:~# docker --version

root@ubuntu:~# docker --version
Docker version 20.10.21, build baeda1f

설치 확인

root@ubuntu:~# docker run httpd

root@ubuntu:~# docker run httpd
Unable to find image 'httpd:latest' locally
latest: Pulling from library/httpd
a603fa5e3b41: Pull complete 
4691bd33efec: Pull complete 
ff7b0b8c417a: Pull complete 
9df1012343c7: Pull complete 
b1c114085b25: Pull complete 
Digest: sha256:f2e89def4c032b02c83e162c1819ccfcbd4ea6bdbc5ff784bbc68cba940a9046
Status: Downloaded newer image for httpd:latest
AH00558: httpd: Could not reliably determine the server's fully qualified domain name, using 172.17.0.2. Set the 'ServerName' directive globally to suppress this message
AH00558: httpd: Could not reliably determine the server's fully qualified domain name, using 172.17.0.2. Set the 'ServerName' directive globally to suppress this message
[Mon Dec 05 01:23:18.409322 2022] [mpm_event:notice] [pid 1:tid 139910831910208] AH00489: Apache/2.4.54 (Unix) configured -- resuming normal operations
[Mon Dec 05 01:23:18.409516 2022] [core:notice] [pid 1:tid 139910831910208] AH00094: Command line: 'httpd -D FOREGROUND'

container image

run은 pull 후 실행까지 하게 하는 명령어. 즉 httpd라는 image를 기반으로 container를 실행한다는 의미다.

지금 container가 동작 중이기 때문에 명령어 입력이 불가능하다. 그냥 Ctrl+C ㄱㄱ

root@ubuntu:~# docker ps

root@ubuntu:~# docker ps
CONTAINER ID   IMAGE     COMMAND   CREATED   STATUS    PORTS     NAMES

보통 container에서 빠져나오면 stop 상태가 된다.

root@ubuntu:~# docker ps -a

root@ubuntu:~# docker ps -a
CONTAINER ID   IMAGE     COMMAND              CREATED         STATUS                      PORTS     NAMES
f1584fd051ad   httpd     "httpd-foreground"   8 minutes ago   Exited (0) 33 seconds ago             quirky_proskuriakova

container를 실행하면 CONTAINER ID라는 고유값이 생성된다. 즉 container를 특정할 수 있다.

NAMES도 마찬가지. 따로 붙이지 않으면 랜덤으로 생성된다.

root@ubuntu:~# docker rm -f f1584fd051ad root@ubuntu:~# docker container ps -a

root@ubuntu:~# docker rm -f f1584fd051ad
f1584fd051ad
root@ubuntu:~# docker container ps -a
CONTAINER ID   IMAGE     COMMAND   CREATED   STATUS    PORTS     NAMES

삭제됨

-f는 아묻따 지우는 옵션

root@ubuntu:~# docker run --name test -d httpd
```
root@ubuntu:~# docker run --name test -d httpd
a68b32d30d78fd5d0209b8772fc26e8e28e059a30b16a2fbd938d00deb0c8095
```
- --name
  
  이름 설정
- -d
  
  는 background로 동작시키는 옵션
- :latest
  
  image마다 붙는 tag
  
  version 정보로 보면 된다

root@ubuntu:~# docker ps

root@ubuntu:~# docker ps
CONTAINER ID   IMAGE     COMMAND              CREATED          STATUS          PORTS     NAMES
a68b32d30d78   httpd     "httpd-foreground"   32 seconds ago   Up 31 seconds   80/tcp    test

예아

VM 하나 띄운 것과 비슷한 상태다. → container도 어떤 네트워크 공간이 있고, 그 공간에 속한다.

root@ubuntu:~# docker network ls

root@ubuntu:~# docker network ls
NETWORK ID     NAME      DRIVER    SCOPE
e17e10bea72e   bridge    bridge    local
e7d368ac9ba7   host      host      local
2e7e0f9b2738   none      null      local

bridge가 NAT대역(211.183.3.0/24)에 해당하고, host가 VM에서의 Bridged에 해당한다.

NAME보다는 유심히 DRIVER를 봐야 한다.

root@ubuntu:~# docker network inspect bridge
- 출력

root@ubuntu:~# ip add

root@ubuntu:~# ip add
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
2: ens32: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 00:0c:29:1c:5c:df brd ff:ff:ff:ff:ff:ff
    inet 211.183.3.100/24 brd 211.183.3.255 scope global ens32
       valid_lft forever preferred_lft forever
    inet6 fe80::20c:29ff:fe1c:5cdf/64 scope link 
       valid_lft forever preferred_lft forever
3: docker0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default 
    link/ether 02:42:9a:e8:7f:c5 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::42:9aff:fee8:7fc5/64 scope link 
       valid_lft forever preferred_lft forever
7: vethf087c8e@if6: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master docker0 state UP group default 
    link/ether 2e:96:48:fc:64:8a brd ff:ff:ff:ff:ff:ff link-netnsid 0
    inet6 fe80::2c96:48ff:fefc:648a/64 scope link 
       valid_lft forever preferred_lft forever

container의 IP 주소 확인

root@ubuntu:~# docker container inspect test

출력

"Gateway": "172.17.0.1",
            "GlobalIPv6Address": "",
            "GlobalIPv6PrefixLen": 0,
            "IPAddress": "172.17.0.2",
            "IPPrefixLen": 16,
            "IPv6Gateway": "",
            "MacAddress": "02:42:ac:11:00:02",

이 부분이 test에 할당된 IP 주소

즉 다음과 같은 형태다.

root@ubuntu:~# curl 172.17.0.2

root@ubuntu:~# curl 172.17.0.2
<html><body><h1>It works!</h1></body></html>

root@ubuntu:~# docker image ls
```
root@ubuntu:~# docker image ls
REPOSITORY   TAG       IMAGE ID       CREATED       SIZE
httpd        latest    8653efc8c72d   2 weeks ago   145MB
```
현재 test container는 httpd를 구동하기 위한 것들만 포함하기 때문에 용량도 크지 않고 실행 가능한 명령어도 많지 않다.

root@ubuntu:~# docker rm -f test root@ubuntu:~# docker ps -a

root@ubuntu:~# docker rm -f test
test
root@ubuntu:~# docker ps -a
CONTAINER ID   IMAGE     COMMAND   CREATED   STATUS    PORTS     NAMES

-f

실행 중인 conatiner는 삭제가 안 되므로 이 옵션을 붙인다.

root@ubuntu:~# docker image ls root@ubuntu:~# docker image tag httpd:latest web:latest root@ubuntu:~# docker image ls

root@ubuntu:~# docker image ls
REPOSITORY   TAG       IMAGE ID       CREATED       SIZE
httpd        latest    8653efc8c72d   2 weeks ago   145MB
root@ubuntu:~# docker image tag httpd:latest web:latest
root@ubuntu:~# docker image ls
REPOSITORY   TAG       IMAGE ID       CREATED       SIZE
httpd        latest    8653efc8c72d   2 weeks ago   145MB
web          latest    8653efc8c72d   2 weeks ago   145MB

이름만 바꾼 거고 같은 container이므로 두 개가 뜨지만 IMAGE ID는 같다.

변경사항이 발생했으므로 해당 layer는 새로 생성되고 나머지 layer는 공유될 것이다. 여기서는 index 파일에 관한 layer가 새로 생성된다.

root@ubuntu:~# docker search nginx

root@ubuntu:~# docker search nginx
NAME                                              DESCRIPTION                                     STARS     OFFICIAL   AUTOMATED
nginx                                             Official build of Nginx.                        17780     [OK]       
linuxserver/nginx                                 An Nginx container, brought to you by LinuxS…   182                  
bitnami/nginx                                     Bitnami nginx Docker Image                      146                  [OK]
ubuntu/nginx                                      Nginx, a high-performance reverse proxy & we…   69                   
bitnami/nginx-ingress-controller                  Bitnami Docker Image for NGINX Ingress Contr…   22                   [OK]
rancher/nginx-ingress-controller                                                                  11                   
kasmweb/nginx                                     An Nginx image based off nginx:alpine and in…   4                    
ibmcom/nginx-ingress-controller                   Docker Image for IBM Cloud Private-CE (Commu…   4                    
bitnami/nginx-exporter                                                                            3                    
bitnami/nginx-ldap-auth-daemon                                                                    3                    
rancher/nginx                                                                                     2                    
circleci/nginx                                    This image is for internal use                  2                    
rancher/nginx-ingress-controller-defaultbackend                                                   2                    
rapidfort/nginx                                   RapidFort optimized, hardened image for NGINX   2                    
vmware/nginx                                                                                      2                    
bitnami/nginx-intel                                                                               1                    
wallarm/nginx-ingress-controller                  Kubernetes Ingress Controller with Wallarm e…   1                    
vmware/nginx-photon                                                                               1                    
ibmcom/nginx-ppc64le                              Docker image for nginx-ppc64le                  0                    
rancher/nginx-conf                                                                                0                    
rapidfort/nginx-ib                                RapidFort optimized, hardened image for NGIN…   0                    
rancher/nginx-ssl                                                                                 0                    
ibmcom/nginx-ingress-controller-ppc64le           Docker Image for IBM Cloud Private-CE (Commu…   0                    
rapidfort/nginx-official                          RapidFort optimized, hardened image for NGIN…   0                    
continuumio/nginx-ingress-ws                                                                      0

Docker hub에서 nginx를 검색한다. Docker hub는 image 저장소.

보통 맨 위에 official image가 있다. 나머지는 사용자들이 만든 image.