도커를 쓰는 이유?
도커란 무엇인가?
도커 이미지와 도커 컨테이너 정의
도커 설치잘됬나 확인
C:\Users\yunaj>docker version
Client:
Cloud integration: v1.0.24
Version: 20.10.17
.....
Engine:
Version: 20.10.17
API version: 1.41 (minimum)
도커 흐름 훝어보기
- helloworld 이미지 만들기
C:\Users\yunaj>docker run hello-world
Unable to find image 'hello-world:latest' locally
--> hello-world 이미지가 없습니다
latest: Pulling from library/hello-world
2db29710123e: Pull complete
Digest: sha256:13e367d31ae85359f42d637adf6da428f76d75dc9afeb3c21faea0d976f5c651
Status: Downloaded newer image for hello-world:latest
--> hello-world이미지를 가지고 왔습니다
Hello from Docker!
This message shows that your installation appears to be working correctly.
To generate this message, Docker took the following steps:
1. The Docker client contacted the Docker daemon.
2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
(amd64)
3. The Docker daemon created a new container from that image which runs the
executable that produces the output you are currently reading.
4. The Docker daemon streamed that output to the Docker client, which sent it
to your terminal.
....
C:\Users\yunaj>docker run hello-world
Unable to find image 'hello-world:latest' locally
--> hello-world 이미지가 없습니다
latest: Pulling from library/hello-world
2db29710123e: Pull complete
Digest: sha256:13e367d31ae85359f42d637adf6da428f76d75dc9afeb3c21faea0d976f5c651
Status: Downloaded newer image for hello-world:latest
--> hello-world이미지를 가지고 왔습니다
Hello from Docker!
This message shows that your installation appears to be working correctly.
To generate this message, Docker took the following steps:
1. The Docker client contacted the Docker daemon.
2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
(amd64)
3. The Docker daemon created a new container from that image which runs the
executable that produces the output you are currently reading.
4. The Docker daemon streamed that output to the Docker client, which sent it
to your terminal.
.... 도커에서 컨데이너란?
C-group, 네임스페이스를 도커 환경에서 쓸 수 있는 이유는?!
도커 이미지 내부 파일 구조
C:\Users\yunaj>docker run alpine ls
--> docker : 도커 클라이언트 언급 // run : 컨테이너 생성 및 실행 // 이미지 : 컨테이너 이미지 // ls : 이미지의 기본 시작 명령어 대신 실행할 명령어(ls: 파일목록)
Unable to find image 'alpine:latest' locally
latest: Pulling from library/alpine
2408cc74d12b: Pull complete
Digest: sha256:686d8c9dfa6f3ccfc8230bc3178d23f84eeaf7e457f36f271ab1acc53015037c
Status: Downloaded newer image for alpine:latest
bin
dev
etc
home
....................
cf. hello-world 이미지는 파일을 가지고 있지 않기 때문에 오류남
C:\Users\yunaj>docker run hello-world ls
docker: Error response from daemon: failed to create shim task: OCI runtime create failed: runc create failed: unable to start container process: exec: "ls": executable file not found in $PATH: unknown.
컨테이너들 나열하기
2개의 cmd 켜기
1개는 명령어&상태 check
또 다른 1개는 ping보내기
- ## 현재 실행중인 container
--> 아무것도 없음
C:\Users\yunaj>docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
C:\Users\yunaj>docker container ls
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
--> 아무것도 없음
----------------------------------------------------------------
- 현재 local 저장에 있는 image들 보기
C:\Users\yunaj>docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
alpine latest e66264b98777 6 weeks ago 5.53MB
hello-world latest feb5d9fea6a5 9 months ago 13.3kB
----------------------------------------------------------------
## alpine 이미지를 실행시켜보자
C:\Users\yunaj>docker run alpine ping localhost
64 bytes from 127.0.0.1: seq=305 ttl=64 time=0.049 ms
64 bytes from 127.0.0.1: seq=306 ttl=64 time=0.043 ms
64 bytes from 127.0.0.1: seq=307 ttl=64 time=0.040 ms
64 bytes from 127.0.0.1: seq=308 ttl=64 time=0.043 ms
64 bytes from 127.0.0.1: seq=309 ttl=64 time=0.079 ms
64 bytes from 127.0.0.1: seq=310 ttl=64 time=0.044 ms
64 bytes from 127.0.0.1: seq=311 ttl=64 time=0.050 ms
64 bytes from 127.0.0.1: seq=312 ttl=64 time=0.044 ms
64 bytes from 127.0.0.1: seq=313 ttl=64 time=0.058 ms
64 bytes from 127.0.0.1: seq=314 ttl=64 time=0.056 ms
cf. ping이란?
--> 호스트와 패킷을 서로 주고받는 과정
C:\Users\yunaj>docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
de4e8b68e12e alpine "ping localhost" 5 minutes ago Up 5 minutes nostalgic_lamport
docker container ls -a
--> 실행 중인 컨테이너뿐만 아니라 종료된 컨테이너도 모두 표시
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
6fb8667a46f5 alpine "ping localhost" 38 minutes ago Exited (137) 15 minutes ago tender_elgamal
3df830b6bfe0 alpine "ping localhost" 47 minutes ago Exited (137) 15 minutes ago amazing_khorana
d9872a2f1821 hello-world "ls" 55 minutes ago Created gracious_gauss
8f4b499426dc alpine "ls" About an hour ago Exited (0) About an hour ago objective_poitras
e4467a78f528 hello-world "ls" About an hour ago Created brave_mendel
dcbf1b34e4c9 hello-world "ls" About an hour ago Created practical_germain
fb11783b1f7c hello-world "/hello" About an hour ago Exited (0) About an hour ago interesting_mirzakhani
1d4ee7dba6dd hello-world "/hello" 2 hours ago Exited (0) 2 hours ago boring_matsumoto
-----------------------------------------------------------------------
## 특정 항목만 보기
C:\Users\yunaj>docker ps --format "table {{.Names}}\t{{.Image}}"
NAMES IMAGE
nostalgic_lamport alpine
-----------------------------------------------------------------------
## 도커 중지시키기
C:\Users\yunaj>docker stop de4e8b68e12e
de4e8b68e12e
C:\Users\yunaj>docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS 