Docker

[box title=”” bg_color=”#dbdbdb” align=”left”]docker build -t mibu/jitsi-meet<new image name> .

docker commit 82669bca3013<container ID> avinash/jitsi-meet<image name>

docker system df
docker system df -v
docker network ls

docker network rm f7a386c67223

docker network create –gateway=192.168.40.4 –subnet=192.168.0.0/16 jitsi_bridge
docker run –net jitsi_bridge –ip 192.168.90.95 -itd shailesh/jitsi-meet

Rename image after pull
docker tag local/old_image local/new_imagename

Push image in dockerhub
docker push docker_id/image
e.g.
docker push shailesh/image_name

NOTE: docker_id should match with the docker hub’s id
Image name should be format docker_id/image_name
You should be logged in to docker hub from terminal[/box]

Useful docker commands

• docker build -t [image name] .
• docker images -a
• docker ps -a
• docker run [image name]
• docker run -d –name [container name] [image name]
• docker run -v [/host/directory]:[/container/directory] [image name]
• docker start [container name]
• docker exec -it [container name] /bin/bash
• docker rmi [image name]
• docker rm [container name]
• docker inspect [container_name]
  to get ip address
• docker search [image name]
  to search image on docker hub and list whether it is official or not

Sample Docker File

FROM php:7.0-apache  
COPY [source directory] /var/www/html
EXPOSE 80

NOTE:

• Keep the name of file Dockerfile only
• Keep the source project directory in the same level where Dockerfile file is present

 

How to create docker image

1. Create Docker file: Dockerfile
   [box title=”” bg_color=”#dbdbdb” align=”left”]FROM php:7.0-apache
   COPY src/ /var/www/html
   EXPOSE 80[/box]
2. docker build -t image-filename docker-file-location [box title=”” bg_color=”#dbdbdb” align=”left”]docker build -t hello-world .[/box]
3. sudo docker run -p localpot:imageport image-name [box title=”” bg_color=”#dbdbdb” align=”left”]sudo docker run -p 8989:80 image-name[/box]
   To name container
   [box title=”” bg_color=”#dbdbdb” align=”left”]sudo docker run -p 8980:80 –name=customcontainername image [/box]
   To mount local app with image/container
   [box title=”” bg_color=”#dbdbdb” align=”left”]sudo docker run -p 8980:80 -v /var/www/html/localapp/:/var/www/html -i -t php-app[/box]
   To copy files from host to docker container
   [box title=”” bg_color=”#dbdbdb” align=”left”]sudo docker cp ./test.php container:/var/www/html/[/box]
   To start existing container
   [box title=”” bg_color=”#dbdbdb” align=”left”]sudo docker start[container name|container id][/box]
   To stop existing container
   [box title=”” bg_color=”#dbdbdb” align=”left”]sudo docker stop [container name|container id][/box]
   To login to container bash
   [box title=”” bg_color=”#dbdbdb” align=”left”]sudo docker exec -it –user root mydockercontainer /bin/bash[/box]

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How to export and import image

You will need to save the docker image as a tar file:

docker save -o <path for generated tar file> <image name>

Then copy your image to a new system with regular file transfer tools such as cp or scp. After that you will have to load the image into docker:

docker load -i <path to image tar file>

PS: You may need to sudo all commands.

Ref: Link: https://stackoverflow.com/questions/23935141/how-to-copy-docker-images-from-one-host-to-another-without-via-repository

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How to remove container and images

Docker ps -a               # Lists containers (and tells you which images they are spun from)
Docker images              # Lists images  
Docker rm <container_id>   # Removes a container

Docker rmi <image_id>      # Removes an image 
                           # Will fail if there is a running instance of that image i.e. container

Docker rmi -f <image_id>   # Forces removal of image even if it is referenced in multiple repositories, 
                           # i.e. same image id given multiple names/tags 
                           # Will still fail if there is a docker container referencing image

Ref Link: https://stackoverflow.com/questions/33907835/docker-error-cannot-delete-docker-container-conflict-unable-to-remove-reposito

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docker composer commands

1. check docker composer version
   [box title=”” bg_color=”#dbdbdb” align=”left”]docker-compose -v
   docker-composer version
   [/box]
2. create docker composer file at any locationvim docker-composer.yml
   [box title=”” bg_color=”#dbdbdb” align=”left”]
   version: ‘3’services:
   web:
   image: nginx
   ports:
   –  9090:80database:
   image: redis
   [/box]
3. compile the docker-compose yml file
   [box title=”” bg_color=”#dbdbdb” align=”left”]docker-compose config[/box]
   
4. run/up docker-compose
   [box title=”” bg_color=”#dbdbdb” align=”left”]docker-compose up -d[/box]
5. check running container
   [box title=”” bg_color=”#dbdbdb” align=”left”]docker ps[/box]
6. stop/down docker-compose
   [box title=”” bg_color=”#dbdbdb” align=”left”]docker-compose down[/box]
7. help manual
   [box title=”” bg_color=”#dbdbdb” align=”left”]docker-compose –help[/box]
8. scaling containers
   [box title=”” bg_color=”#dbdbdb” align=”left”]docker-compose up -d –scale service-name=count
   e.g. docker-compose up -d –scale database=4[/box]

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create docker image from container

1. create base container
   [box title=”” bg_color=”#dbdbdb” align=”left”]docker create –name custom_container_name -p 8080:80 image_name[/box]
2. list available images
   [box title=”” bg_color=”#dbdbdb” align=”left”]docker images[/box]
3. list available containers
   [box title=”” bg_color=”#dbdbdb” align=”left”]docker ps -a[/box]
4. start the container
   [box title=”” bg_color=”#dbdbdb” align=”left”]docker start custom_container_name[/box]
5. modify the running container
   [box title=”” bg_color=”#dbdbdb” align=”left”]docker cp local_files_or_directory custom_container_name:/var/www/html/[/box]
6. create image from modified container
   [box title=”” bg_color=”#dbdbdb” align=”left”]docker commit custom_container_name[/box]list images[box title=”” bg_color=”#dbdbdb” align=”left”]docker images[/box]There must be a new image without tag name
7. tag the untitled image
   [box title=”” bg_color=”#dbdbdb” align=”left”]docker tag [image id] new_image_name[/box]list images[box title=”” bg_color=”#dbdbdb” align=”left”]docker images[/box]You will find new image you’ve just created
8. commit with tag name [optional]
   [box title=”” bg_color=”#dbdbdb” align=”left”]docker commit custom_container_name new_image_name[/box]
9. remove the temporary created container
   [box title=”” bg_color=”#dbdbdb” align=”left”]docker ps
   docker stop custom_container_name
   docker rm custom_container_name
   [/box]
10. run the newly created image
    [box title=”” bg_color=”#dbdbdb” align=”left”]docker ps -a
    docker run –name custom_container_name -d -p 8080:80 newly_created_image_name[/box]
11. check browser
    [box title=”” bg_color=”#dbdbdb” align=”left”]http://localhost:8080[/box]

Ref: https://www.scalyr.com/blog/create-docker-image/