구차니의 잡동사니 모음

[링크 : https://serverfault.com/questions/200759/exportfs-warning-home-user-share-does-not-support-nfs-export]

[링크 : https://serverfault.com/questions/275988/what-is-rootfs]

평등기반, 셋기반

[링크 : https://kubernetes.io/docs/concepts/overview/working-with-objects/labels/]

도움말을 보는데 많이 생략된 느낌이라.. 해보긴 좀 귀찮고.. -_-

namespace를 지우면 거기 들어있는 pods도 같이 삭제된다.

아무튼 찾아보니 --namespce 옵션에 값을 주어 특정 ns상의 pods를 삭제할 수 있어 보인다.

[링크 : https://stackoverflow.com/questions/33509194/command-to-delete-all-pods-in-all-kubernetes-namespaces]

git으로 로컬에 저장해두고 push 안한 상태에서

pull 하려고 하면 발생하는 에러

(본인이 직접 container 생성하는게 아니라면 볼일이 없을 듯)

[링크 : https://managedkube.com/.../imagepullbackoff/2019/02/23/imagepullbackoff.html]

저...언혀 사람이 쓰기 안편한데...

내가 사람이 아닌건가?!

(아니 난.. XML이나 JSON이 훨 편한데? ㅠㅠ)

[링크 : https://yaml.org/]

+

헐.. JSON의 슈퍼셋이 YAML이라니.. YAML이 더 큰거였다니!?!

[링크 : https://stackoverflow.com/questions/1726802/]

+

어짜피 그게 그거라 docker에서도 json으로 쓰면 yml이랑 상관없이 알아서 읽는 듯?

[링크 : https://docs.docker.com/compose/faq/]

docker 처럼 명령어가 넘쳐나는구만

C:>kubectl
kubectl controls the Kubernetes cluster manager.

 Find more information at: https://kubernetes.io/docs/reference/kubectl/overview/

Basic Commands (Beginner):
  create         Create a resource from a file or from stdin.
  expose         Take a replication controller, service, deployment or pod and expose it as a new
Kubernetes Service
  run            Run a particular image on the cluster
  set            Set specific features on objects

Basic Commands (Intermediate):
  explain        Documentation of resources
  get            Display one or many resources
  edit           Edit a resource on the server
  delete         Delete resources by filenames, stdin, resources and names, or by resources and
label selector

Deploy Commands:
  rollout        Manage the rollout of a resource
  scale          Set a new size for a Deployment, ReplicaSet, Replication Controller, or Job
  autoscale      Auto-scale a Deployment, ReplicaSet, or ReplicationController

Cluster Management Commands:
  certificate    Modify certificate resources.
  cluster-info   Display cluster info
  top            Display Resource (CPU/Memory/Storage) usage.
  cordon         Mark node as unschedulable
  uncordon       Mark node as schedulable
  drain          Drain node in preparation for maintenance
  taint          Update the taints on one or more nodes

Troubleshooting and Debugging Commands:
  describe       Show details of a specific resource or group of resources
  logs           Print the logs for a container in a pod
  attach         Attach to a running container
  exec           Execute a command in a container
  port-forward   Forward one or more local ports to a pod
  proxy          Run a proxy to the Kubernetes API server
  cp             Copy files and directories to and from containers.
  auth           Inspect authorization

Advanced Commands:
  diff           Diff live version against would-be applied version
  apply          Apply a configuration to a resource by filename or stdin
  patch          Update field(s) of a resource using strategic merge patch
  replace        Replace a resource by filename or stdin
  wait           Experimental: Wait for a specific condition on one or many resources.
  convert        Convert config files between different API versions
  kustomize      Build a kustomization target from a directory or a remote url.

Settings Commands:
  label          Update the labels on a resource
  annotate       Update the annotations on a resource
  completion     Output shell completion code for the specified shell (bash or zsh)

Other Commands:
  api-resources  Print the supported API resources on the server
  api-versions   Print the supported API versions on the server, in the form of "group/version"
  config         Modify kubeconfig files
  plugin         Provides utilities for interacting with plugins.
  version        Print the client and server version information

Usage:
  kubectl [flags] [options]

Use "kubectl <command> --help" for more information about a given command.
Use "kubectl options" for a list of global command-line options (applies to all commands).

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]