This is a draft cheat sheet. It is a work in progress and is not finished yet.
Start
docker version |
get the docker version |
docker run hello-world |
check if everething works |
docker run -d redis |
-d for run in background (detach mode) |
docker ps |
show all runs. ps
stands for ‘process status’ |
docker ps -a |
show all run / paused / stoped |
docker stop CONTNAME |
stop a running container with his name |
docker rm CONTNAME |
remove the instance |
docker rm $(docker ps -a -q) |
remove all listed instances |
docker system prune |
Erase all /!\ use for big clean |
docker kill CONTNAME |
stop close nicely with maybe some save, message etc Kill will kill now |
DOCKER IMAGE
docker image ls |
List all your images |
Useful flags
ls |
List running |
ls --all |
List all |
ls -aq |
List all in quiet mode |
REDIS
docker run redis |
will start the redis image |
docker exec -it 0c04f252f8d2 redis-cli |
In an other terminal run this command to access the redis instance with redis-cli |
exec : execute multi command
-it : interactive mode == -i -t : (-i attach to stdin) (-t is use to format nicely what you see)
USEFUL COMMANDS
docker cp folder/test.txt CONTNAME:/path |
CP - Copy file to/from docker container: |
docker image inspect IMAGENAME |
INSPECT - use to inspect info about an image |
docker logs |
Access to logs useful when build, run fail |
DELETE IMAGES & CONTAINERS
docker rmi <your-image-id> |
delete docker image (no container linked) |
docker container rm <container_id_1> |
Delete container |
docker image prune -a |
delete all images |
docker container prune |
delete all stopped containers |
Working with volume
VOLUME ["app/tempfile"] |
Add anonymous volume for temp files in Dockerfile |
docker volume ls |
List all volumes available |
docker run -p 3000:3000 --rm --name test-app -v tosave:app/saveme imageName:info |
Create a named volume to get data persistant |
docker volume rm VOL_NAME |
To delete a specific volume |
docker volume prune |
To clear al volumes |
ENV & ARG
ENV name value |
is use on docker file |
--env PORT=3000 or -e PORT=3000 |
is use on docker run
(overwrite dockerfile) |
--env-file .env |
on docker run
use a file to define env variable |
ARG DEFAULT_PORT=80 |
is use on dockerfile for the image build |
ENV PORT $DEFAULT_PORT |
ex of use ARG in dockerfile |
docker build -app:1 --build-arg DEFAULT_PORT=3000 |
Change ARG in dockerfile on build with --build-arg
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TIPS 1 - CREATE START LOGS
docker run = docker create + docker start |
docker create hello-world |
return a container id |
docker start -a 456789123dj.. |
-a mean get output to my terminal |
docker logs 456789123dj.. |
print the logs when not use the -a |
456789123dj.. is the container id
TIPS 2 - EXEC -it SH
docker exec -it 0c04f252f8d2 sh |
open a shell in a running container |
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exit the shell |
docker run -it busybox sh |
attach stdin stdout & run shell |
DOCKERFILE
|
FROM WORKDIR COPY RUN EXPOSE CMD |
docker build . |
run this command to build your image |
=> Successfully built b3cc42a9ef20 |
Return you the image id |
docker build -t myredis . |
Add a tag to the image |
mcz/redis:latest |
tag convention: dockerid/projectname:version |
FROM node:alpine |
take the node base image |
COPY ./ ./ |
copy all file inside our project |
WORKDIR /user/app |
Set a default safe directory to pull files |
RUN npm install |
node classic action |
ENV PORT 3000 |
Use env variable in your docker file EXPOSE $PORT
` |
CMD ["npm", "start"] |
Script start in package.json |
docker build -t john/nodeserver . |
Build image with a tag name |
docker run -p 8080:8080 john/nodeserver |
Set port mapping to enable incoming traffic |
docker ps |
list running container with id |
docker exec -it c6632338e690 sh |
Get a shell inside your running container |
docker build -f Dockerfile.dev |
To run a dev version called Dockerfile.dev |
DOCKER COMPOSE
docker-compose |
List all cmd available |
docker-compose up |
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docker-compose up --build |
build image + run |
docker-compose up -d |
With -d run in background |
docker-compose down |
Stop the containers |
restart: on-failure |
LIST OF RESART CMD |
"no" |
never restart |
always |
restart anyway |
on-failure |
restart on process.exit(34) value > 0 |
unless-stoped |
always unless the dev stop |
docker-compose ps |
Only works in the current directory |
Terminology
SIGTERM |
terminate signal |
SIGKILL |
Kill signal |
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