We have been stuck on this for a few days now and I am really not sure what could be missing. I can get chromic_pdf to work perfectly fine on my dev environment. I.e. it can render and store PDFs from HTML without any issue.In terms of setting it up:

mix.exs:

{:chromic_pdf, "~> 1.17"}

runtime.exs

  config :tailboard, :pdf, url: System.fetch_env!("APP_URL")

  config :chromic_pdf,
    chrome_executable: System.get_env("CHROME_PATH"),
    discard_stderr: false,
    chrome_args: [
      "--no-sandbox",
      "--disable-dev-shm-usage",
      "--disable-gpu",
      "--disable-setuid-sandbox",
      "--disable-software-rasterizer",
      "--enable-logging=stderr",
      "--headless"
    ],
    log_level: :info,
    temp_dir: "/tmp/app"

application.exs

  def start(_type, _args) do
    TailboardWeb.AllowedAddressList.start()

    # Define workers and child supervisors to be supervised
    children = [
      ...other modules

      ChromicPDF
    ]

    # See https://hexdocs.pm/elixir/Supervisor.html
    # for other strategies and supported options
    opts = [strategy: :one_for_one, name: Tailboard.Supervisor]
    Supervisor.start_link(children, opts)
  end

In Dockerfile I get these dependencies:

RUN apt-get update -y && \
  apt-get install -y \
    libstdc++6 openssl libncurses5 locales ca-certificates chromium \
    libnss3 libfreetype6 libharfbuzz0b fonts-freefont-ttf imagemagick \
    tini fontconfig curl \
  && apt-get clean && rm -f /var/lib/apt/lists/*_*

Is there anything I am missing?