50 preguntas y respuestas de la entrevista de Docker



Docker, 2013 , — , «». , , Google, Amazon VMware Docker , . ? Docker, , .



Docker?



— , , . Docker Docker. , , , , , , .



Docker



Docker — :



  • , Docker, . Registry, — , Docker.
  • , Docker.
  • registry, . , , , Docker Hub Docker Cloud.


Registry



Docker Registry Docker. : Docker Hub Docker Cloud. Docker Hub — , .



Docker



:





Docker



Docker:



  • build, Docker
  • create,
  • kill.
  • dockerd, Docker
  • commit,


Docker?



Docker — , . , . , , .



Docker Swarm?



Docker Swarm ( swarm mode, . ) — Docker, . Docker .



Docker?



, :



docker ps -a


. .



Docker, Docker run?



Docker — , , , . , . Docker run , , Docker. .



Docker



Docker :



  • ;
  • , ;
  • ;
  • ;
  • ;
  • .


Docker?



, .

— .

— .

— Docker, swarm.



.



Docker: (stateful) (stateless)?



(stateless) Docker, (stateful). . . , . Docker.



Dockerfile?



Dockerfile , Docker. , , , , .



Docker?



:



  • bridge, , , .
  • none, .
  • host, .


, Git



, , :



  • Docker build
  • Registry
  • , Registry
  • HTTP(S)


Docker ?



Docker — , . Docker, , , . Docker — , , , .



Docker , . DockerHub, Registry , . — . Docker , .



— ?



Docker , , , — . , . : .



Docker ?



Docker stats Docker events. . stats , . top. events, Docker. : , commit, , .., .



Docker



Docker:



  • c Dockerfile, .
  • , . — Dockerfile.
  • , Registry, .
  • . , .


docker run docker create



, . docker create . docker run, --cidfile FILENAME, .



?



, , . , x86, .



? . , — , , .. , (host) , .



:





Registry Repository?



Registry — , DockerHub — Registry . Repository — . , .



JSON YAML docker-compose, — ?



, . , :



docker-compose -f docker-compose.json up


CMD ENTRYPOINT Dockerfile



Dockerfile , . , :



  • , CMD ENTRYPOINT, Dockerfile.
  • — ENTRYPOINT .
  • — CMD .


Linux, Docker



  • Docker;
  • Docker Hub;
  • ;
  • , ;
  • ;
  • ;
  • ;
  • .


?



, , — . . , , , .., , . :



  • , , ;
  • , , .




. , / .





Docker, DockerHub, Dockerfile



: , , . . Docker .



DockerHub: . , , , GitHub (Bitbucket), DockerHub. Docker.



Dockerfile: , . . Docker .



Docker client Docker server?



Docker docker version []. , , . , :



docker version --format '{{.Server.Version}}'


Docker Repository



Docker Repository, :



docker login [OPTIONS] [SERVER]


, registry, (), :



$ docker login localhost:8080


Docker



  • docker push: Registry;
  • docker run: ;
  • docker pull: Registry;
  • docker start: ;
  • docker stop: ;
  • docker search: DockerHub;
  • docker commit: .


Docker ?



Docker . , . , . .



Docker?



Docker Windows (x86_64), Linux (x86_64, ARM, s390x, ppc64le).



?



, . Docker :



  • Off: , ;
  • On-failure: , ;
  • Unless-stopped: , ;
  • Always: , .


:



$ docker run -dit — restart [unless-stopped|off|on-failure|always] [CONTAINER]


Docker?



, , , , — , . , .



Docker



Created — , .

Restarting — .

Running — .

Paused — .

Exited — .

Dead — , , .





, . :



  • ;
  • ;
  • ;
  • ;
  • ;
  • , .


memory-swap



memory-swap , , . , memory. , memory = "400m" memory-swap = "1g", 400 600 (1-400).



Docker?



, Docker ( -Docker ), Docker /var/lib/docker/volumes/. — Docker.



Docker



:



docker -version: Docker;

docker ps: ;

docker ps -a: , , ;

docker exec: ;

docker build: Dockerfile;

docker rm: ;

docker rmi: ;

docker info: Docker, , , , , ..;

docker cp: ;

docker history: .



systemd Docker



Docker Linux systemd. systemctl. , service.



$ sudo systemctl start docker
$ sudo service docker start


, :



$ sudo systemctl enable docker
$ sudo systemctl disable docker


:



$ sudo systemctl edit docker


:



$ journalctl -u docker


Docker



docker-compose scale. :



  • n :


$ docker-compose --file docker-compose-run-srvr.yml scale <service_name>=<n>


docker-compose-run-srvr.yml, n , n — .



  • :


$ docker ps -a


CNM?



CNM Container Network Model — , , , . CNM : sandbox (), .



Docker?



  • Bind mount: ;
  • Volume mount: Docker ;
  • tmpfs mount: , .


Docker Trusted Registry



Docker. , . DTR CI/CD , . , .



docker_host?



URL unix, API Docker. — unix://var/run/docker.sock



TCP, :

tcp://192.0.1.20:3230



compose ? ?



docker-compose, YAML . . , :



  • Dockerfile,
  • docker-compose.yml
  • docker-compose up


Docker



Docker — -, . . , , , , , , , swarm . , .





Docker. ? .




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