rationale Link to heading

  • need to compile podman image on laptop because vps/instance has low ressources

on laptop Link to heading

create directories

mkdir -p pods/caddy && cd /pods/caddy

a build file

  • here version is hardcoded you can use latest

~/pods/caddy/caddy.build

ARG CADDY_VERSION=2.10.0
FROM caddy:builder AS builder

RUN xcaddy build \
  --with github.com/caddy-dns/ionos \
  --with github.com/caddy-dns/ovh

FROM caddy:${CADDY_VERSION}

COPY --from=builder /usr/bin/caddy /usr/bin/caddy

before building check for existing conflicting images

podman images

if so delete it

podman rmi localhost/caddy.vps1

now build

podman build --no-cache -f caddy.build -t caddy.vps1 .

once built export in archive

  • check if .tar filename already exists otherwise you’ll get
Error: docker-archive doesn't support modifying existing images

podman save -o caddy.vps1.tar localhost/caddy.vps1:latest

copy image to your vps/instance

scp caddy.vps1.tar myuser@myvpsip:./

on vps Link to heading

before importing check if there’s conflicting images

podman images

if so delete them

load the built image

podman load -i ~/caddy.vps1.tar

Loaded image: localhost/caddy.vps1:latest

then tag it

podman tag localhost/caddy.vps1:latest caddy.vps_1:latest

you can now use it in a podman-compose.yml

---
services:
  caddy:
    image: caddy.vps_1:latest
    ports:
      - "80:80"
      - "443:443"
    volumes:
      - ./Caddyfile:/etc/caddy/Caddyfile:ro,Z
      - ./logs:/srv/data:z
    env_file: "caddy.env"
    environment:
      - ACME_AGREE=true
    restart: unless-stopped
...

troubleshooting Link to heading

if at some point you need to prune everything

podman system prune -a -f

ressources Link to heading

https://docs.podman.io/en/latest/markdown/podman-save.1.html