For all the posts I’ve created the last couples of weeks I’ve seen people accessing this blog from all over the world, from Norway, China, Singapore, Vietnam, Switzerland (yes, I’ve wrote this in one go and I got it right). So thanks for your access from all parts of the world.

With 3 years at Red Hat working with java, python, c++ and about 12y on this IT road (since 2009), as my Nihongo Sensei says the more I learn the more I realize I know. But I’m very glad to help all developers out there.

For today we will talk about build images with podman with a dockerfile

The dockerfile has this simple syntax, pretty much where, copy and run. The trick hat with the dockerfile is that it is very simple to use and it is at the same time very powerful:

Example of build with podman and dockerfile, some dockerfiles best practices can be found here

# syntax=docker/dockerfile:1
FROM node:12-alpine
RUN apk add --no-cache python3 g++ make
WORKDIR /app
COPY . .
RUN yarn install --production
CMD ["node", "src/index.js"]

Context directory

Interestingly although I’m using podman 1.6.4, I still need to set the context directory of the build, which shouldn’t be the case.

$ sudo podman build -t Dockerfile . <-------- don't forget the .
STEP 1: FROM registry.redhat.io/datagrid/datagrid-8-rhel8:1.2
Error: error creating build container: Error initializing source docker://registry.redhat.io/datagrid/datagrid-8-rhel8:1.2: unable to retrieve auth token: invalid username/password: unauthorized: Please login to the Red Hat Registry using your Customer Portal credentials. Further instructions can be found here: https://access.redhat.com/RegistryAuthentication