Docker with systemd

A Docker template with systemd lets you manage the Docker daemon as a service. This approach is useful when you need better control over Docker lifecycle and integration with other systemd services inside Leap0 sandboxes.

Dockerfile

Create a Dockerfile to set up Docker with systemd:

FROM ubuntu:22.04

ENV DEBIAN_FRONTEND=noninteractive
ENV container=docker

RUN apt-get update && apt-get install -y --no-install-recommends \
    ca-certificates \
    curl \
    gnupg \
    systemd systemd-sysv \
    && rm -rf /var/lib/apt/lists/*

# Install Docker GPG key and repository
RUN install -m 0755 -d /etc/apt/keyrings \
    && curl -fsSL https://download.docker.com/linux/ubuntu/gpg -o /etc/apt/keyrings/docker.asc \
    && chmod a+r /etc/apt/keyrings/docker.asc \
    && . /etc/os-release \
    && echo "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] https://download.docker.com/linux/ubuntu ${VERSION_CODENAME} stable" \
       > /etc/apt/sources.list.d/docker.list \
    && apt-get update \
    && apt-get install -y --no-install-recommends \
       docker-ce \
       docker-ce-cli \
       containerd.io \
       docker-buildx-plugin \
       docker-compose-plugin \
    && rm -rf /var/lib/apt/lists/*

# Enable Docker service on boot
RUN systemctl enable docker

STOPSIGNAL SIGRTMIN+3

CMD ["/sbin/init"]

Build and publish the image

Build the Docker template and push it to a registry that Leap0 can pull from:

docker build -t registry.example.com/my-org/docker-systemd-template:v1 ./docker-systemd
docker push registry.example.com/my-org/docker-systemd-template:v1

Create the Leap0 template

Create a Leap0 template that points to the Docker systemd image:

import { Leap0Client } from "leap0";

const client = new Leap0Client();

const template = await client.templates.create({
  name: "docker-systemd",
  uri: "registry.example.com/my-org/docker-systemd-template:v1",
});

console.log(template.id);
await client.close();

Start a sandbox with Docker

Create a sandbox from the Docker systemd template:

const sandbox = await client.sandboxes.create({
  template_name: "docker-systemd",
});

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Dockerfile

Build and publish the image

Create the Leap0 template

Start a sandbox with Docker

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