Table of contents
Images
Base Image:
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commands:
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Copying application files & directories
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Excluding files & directories
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Running commands
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Setting environment variables
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inspect env variable:
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Exposing PORTs
EXPOSE command desn't automatically publish the port on the host.
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Managing users in linux
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Setting the users
When you use USER app in a Dockerfile, it only sets the user for subsequent RUN, CMD, and ENTRYPOINT commands, not for COPY commands. The COPY command operates at the filesystem level within the Docker image and does not inherit the user set by USER.
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Entrypoints
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Speeding up builds
An image is a collections of layers that only includes modified files. Once a layer is rebuilt, all the following layers have to be rebuilt. Put instructions that change a lot at the bottom, and instructions that don't change much at the top.
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Removing images and containers
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Tagging images
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Sharing Images
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Saving & Loading an Image
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Containers
Starting containers
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Viewing logs
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Publishing ports
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Execturing commands in running containers
Execute commands within a running container using the exec command.
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Stopping and starting containers
Create a new container using the docker run command, and restart a stopped container using docker start.
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Removing containers
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Volumes
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Copying files b/w host and containers
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Sharing the source code with a container
Publishing changes
- For production: build a new image
- For development: we don't want to build a new image every time.
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Remove images and containers
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Running multi container applications
Yaml
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docker-compose.yml
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Building images
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Starting & Stopping the application
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Viewing logs
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Publishing changes
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validate and display the configuration
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Use Compose Watch
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