Question 1

How do I install packages in an Alpine Docker image?

Accepted Answer

Use the 'apk add' command with the '--no-cache' flag to avoid caching and keep the image small. For example, 'RUN apk add --no-cache mysql-client' installs MySQL client without extra dependencies, as shown in the README's usage example.

Question 2

Is Alpine Docker image better than Ubuntu for production?

Accepted Answer

Alpine is superior for minimizing image size and build times, but Ubuntu might be better for compatibility with glibc-based software. Choose Alpine for efficiency if your application supports musl libc, as highlighted in the size comparisons.

Question 3

Does Alpine support Python 3 and Node.js?

Accepted Answer

Yes, Alpine's package repository includes up-to-date versions of Python 3, Node.js, and other common languages. You can install them using commands like 'apk add python3' or 'apk add nodejs', as demonstrated in the README with Node.js.

Question 4

How to reduce Docker image size with Alpine?

Accepted Answer

Start with the gliderlabs/alpine base image, use 'apk add --no-cache' for packages, and clean up temporary files in the same RUN command. This approach slashes size, as seen in the MySQL client example shrinking from 164 MB to 36 MB.

Question 5

Are there any known issues with Alpine in Docker?

Accepted Answer

Common issues include compatibility problems with musl libc, such as segfaults in some binaries, and the need to install additional libraries for certain applications. Always test your stack with Alpine before production deployment.

Question 6

Alpine vs Debian for Docker: which one should I use?

Accepted Answer

Alpine is much smaller (5 MB vs 123 MB) and faster to build, but Debian has broader library support and uses glibc. Use Alpine for minimal containers where size matters, Debian for maximum compatibility with existing software.

docker-alpine

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