Container registries often charge for both storage and data transfer. Large images take longer to download and increase your bandwidth bill. By trimming unnecessary packages and using multi-stage builds, you can slim down each image substantially. This calculator reveals how those megabytes translate to real-world cost reductions.
The total data transferred each month is your image size times the number of pulls. If is your current size, the optimized size, the number of pulls, and the transfer cost per gigabyte, savings are calculated as . Note that 1,024 MB equals one GB. The result assumes your registry charges solely for outbound data; if storage fees also drop with a smaller image, your savings may be even higher.
Say your current image is 800 MB and you reduce it to 300 MB. With 200 pulls per month at $0.10 per GB, you would save , or about $9.77 monthly. While that might seem small at first glance, these savings compound when running dozens of services or when your images are pulled frequently by CI pipelines.
Smaller images also deploy faster and reduce attack surface. Consider scanning your layers for obsolete packages and using minimal base images to keep size low.
Containers tend to bloat over time as new dependencies are added. Schedule periodic audits to review installed packages and multi-stage build steps. Version control can help identify when a large dependency sneaks in so you can address it before costs spiral. The earlier you optimize, the more you save.
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