new post: docker build without cache

content/posts/2024-12-10-docker-build-ignore-cache.md

@@ -0,0 +1,24 @@
+---
+title: "Docker build: ignore cache"
+date: 2024-12-10T19:45:42-03:00
+tags:
+  - dev
+  - devops
+---
+
+To build a docker image completely from scratch, without reusing cache layers on
+your system:
+
+```shell
+docker build --no-cache -f Dockerfile . -t {image name}:{image tag} --platform
+linux/amd64
+```
+
+<!--more-->
+
+- Pass an explicit platform in case e.g. you're building on a Mac M1 (arm64)
+  with the intent of running it on Linux in the cloud (amd64 typically).
+- The docker image full specification is: image =
+  `{registry}/{repository}:{tag}`. For example, the registry could be an AWS ECR
+  URL, whereas the repository is something like "bitnami/sealed-secrets", and
+  the tag typically follows semantic versioning.