구차니의 잡동사니 모음

Dockerfile

COPY .(host) .(container)

CMD 는 ENTRYPOINT의 일부(둘다 지정시)


CMD
The CMD instruction has three forms:
CMD ["executable","param1","param2"] (exec form, this is the preferred form)
CMD ["param1","param2"] (as default parameters to ENTRYPOINT)
CMD command param1 param2 (shell form) <<<<< SHELL FORM

docker run -it ubuntu bash
는 cmd를 엎어 씀
entrypoint는 덮어 쓸수 없음(그렇기에 entry point없이 cmd만으로 된것으로 확인할수 있음)

        "Config": {
            "Hostname": "",
            "Domainname": "",
            "User": "",
            "AttachStdin": false,
            "AttachStdout": false,
            "AttachStderr": false,
            "Tty": false,
            "OpenStdin": false,
            "StdinOnce": false,
            "Env": [
                "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
            ],
            "Cmd": [
                "/bin/bash"
            ],
            "ArgsEscaped": true,
            "Image": "sha256:ae950a0376fe6c4d08fa7ff395f50f4a909e26e9f2d865d8641cda024161c6ee",
            "Volumes": null,
            "WorkingDir": "",
            "Entrypoint": null,
            "OnBuild": null,
            "Labels": null
        },

----

docker run help
      --entrypoint string              Overwrite the default ENTRYPOINT of the image

[링크 : https://docs.docker.com/engine/reference/builder/#understand-how-cmd-and-entrypoint-interact]

복수개의 Run

FROM golang:1.11-alpine AS build

# Install tools required for project
# Run `docker build --no-cache .` to update dependencies
RUN apk add --no-cache git
RUN go get github.com/golang/dep/cmd/dep

# List project dependencies with Gopkg.toml and Gopkg.lock
# These layers are only re-built when Gopkg files are updated
COPY Gopkg.lock Gopkg.toml /go/src/project/
WORKDIR /go/src/project/
# Install library dependencies
RUN dep ensure -vendor-only

# Copy the entire project and build it
# This layer is rebuilt when a file changes in the project directory
COPY . /go/src/project/
RUN go build -o /bin/project

# This results in a single layer image
FROM scratch
COPY --from=build /bin/project /bin/project
ENTRYPOINT ["/bin/project"]
CMD ["--help"]


[링크 : https://docs.docker.com/develop/develop-images/dockerfile_best-practices/]

[링크 : https://hiseon.me/linux/ubuntu/ubuntu-kubernetes-install/]

[링크 : https://lifesupportloopy.tistory.com/15]

docker의 환경변수로 특정 서버를 지정해줄때 아래와 같이

DOCKER_HOST 변수를 통해 기본으로 사용될 원격 서버를 변경할 수 있다.

minikube docker-env | Invoke-Expression


SET DOCKER_TLS_VERIFY=1
SET DOCKER_HOST=tcp://192.168.99.100:2376
SET DOCKER_CERT_PATH=C:\Users\CCCR-EDU-5\.minikube\certs
REM Run this command to configure your shell:
REM @FOR /f "tokens=*" %i IN ('minikube docker-env') DO @%i

[링크 : https://stackoverflow.com/questions/44446472/docker-run-on-a-remote-host]

virtualbox headless 옵션은 background로 실행한다.

[링크 : https://twpower.github.io/149-run-virutalbox-vm-in-background]

kubenetes 윈도우용 버전

일부 기능은 제한되어 있다고 하는데.. 실습용으로는 충분하다고 한다.

[링크 : https://github.com/kubernetes/minikube]

namespace
UTS - UNIX Time Sharing

[링크 : https://unix.stackexchange.com/questions/183717/whats-a-uts-namespace ]


UTS namespaces allow a single system to appear to have different host and domain names to different processes. 

[링크 : https://en.wikipedia.org/wiki/Linux_namespaces ]

[링크 : https://windsock.io/uts-namespace/]

LXC
LXD (캐노니컬 그룹에서 docker에 대응하는?)

[링크 : https://ingeec.tistory.com/79]

[링크 : https://en.wikipedia.org/wiki/OS-level_virtualisation#Implementations]

명령어가 길어서 외우기에는 뇌의 여백이 부족하구나...

docker ps --filter "status=exited"
docker ps -f "status=exited"

[링크 : https://stackoverflow.com/questions/30231187/list-only-stopped-docker-containers]

save / load는 layer 정보가 남은 채로 tar로 묶이지만

import / export는 남기지 않는다고

(그런 이유로 import로 불러오면 새로운 SHA값의 layer가 생성됨)

[링크 : https://stackoverflow.com/questions/36925261/what-is-the-difference-between-import-and-load-in-docker]