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This guide covers Debian, Ubuntu and RHEL-style hosts, repeatable playbooks, architecture and version checks, container management, Compose workloads, firewall implications and the failures that most often stop an automated rollout.
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What the Ansible installation should accomplish
An installation playbook is more than a package task. A production-ready run should leave each target in a known state:
- The operating system and CPU architecture are supported by the Docker release you intend to use.
- Conflicting distribution packages are removed when Docker’s instructions require it.
- The official Docker repository and signing key are present with restrictive, correct permissions.
docker-ce,docker-ce-cli,containerd.io,docker-buildx-pluginanddocker-compose-pluginare installed.- The Docker service is enabled at boot and running now.
- A test container can start successfully.
- The Ansible controller has the
community.dockercollection, while the Python interpreter that runs Docker modules has the Docker SDK. - Container definitions can be rerun without creating duplicates or changing healthy workloads unnecessarily.
Docker describes its Linux procedure as an Engine installation, while the Ansible Docker Working Group describes community.docker as a collection of modules and plugins for orchestrating containers and Docker Swarm. Keeping those layers separate makes failures easier to diagnose: package and service problems belong to the host setup; API, SDK and module problems belong to Ansible’s execution environment.
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Check the target before changing it
Supported distributions and releases
Docker’s support matrix changes over time and architecture support differs by distribution. At the time covered by the current manuals, Docker’s Debian instructions list Debian Trixie 13 and Bookworm 12, while the RHEL instructions list maintained RHEL 8, 9 and 10. Ubuntu, Fedora, CentOS and other platforms have their own repository paths and release names. Do not assume that a derivative uses the same codename or package metadata as its parent.
| Host family | Repository workflow | Package manager | Important qualification |
|---|---|---|---|
| Debian and Ubuntu | Docker apt repository, keyring and signed source | apt |
Use the distribution codename expected by Docker; derivatives may need a matching upstream codename. |
| RHEL | Docker rpm repository | dnf |
Use the repository branch matching the RHEL major release. |
| Other supported Linux systems | Distribution-specific Docker repository | Varies | Keep repository URL, package names and architecture mapping in variables and validate them against Docker’s current support page before rollout. |
Architecture and connectivity checks
Run a fact-gathering play first. Confirm ansible_facts.distribution, ansible_facts.distribution_major_version, ansible_facts.architecture and the codename or release string. The host needs outbound access to the repository and to the registry used for the verification image. If a server is behind a proxy, configure the package manager and Docker daemon proxy separately; a successful apt or dnf transaction does not prove that the daemon can reach a registry.
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Use a remote account with privilege escalation, Python available on the target, and a stable value for ansible_python_interpreter. Decide whether the Docker SDK will be installed into the system interpreter or a virtual environment before writing module tasks. That choice determines where Ansible must find the SDK.
Install Docker Engine on Debian or Ubuntu
Repository and package sequence
Docker’s Debian procedure requires an apt keyring, a signed repository entry and a metadata refresh before package installation. The following playbook is intentionally explicit. It removes common conflicting packages, creates the keyring directory, downloads the signing key, installs the repository, installs the Engine components, starts the service and runs a disposable test container.
The repository URL is selected from the distribution family. If you support a derivative, set its Docker-compatible codename explicitly rather than trusting an automatically detected value.
- name: Install Docker Engine on Debian-family hosts
hosts: docker_hosts
become: true
gather_facts: true
vars:
docker_arch_map:
x86_64: amd64
aarch64: arm64
armv7l: armhf
docker_arch: '{{ docker_arch_map[ansible_facts.architecture] | default(ansible_facts.architecture) }}'
docker_repo_base: 'https://download.docker.com/linux/{{ ansible_facts.distribution | lower }}'
docker_repo_codename: '{{ ansible_facts.lsb.codename | default(ansible_facts.distribution_release) }}'
tasks:
- name: Remove packages that conflict with Docker Engine
ansible.builtin.apt:
name:
- docker.io
- docker-doc
- docker-compose
- podman-docker
- containerd
- runc
state: absent
purge: true
update_cache: false
- name: Install repository prerequisites
ansible.builtin.apt:
name:
- ca-certificates
- curl
state: present
update_cache: true
cache_valid_time: 3600
- name: Create Docker keyring directory
ansible.builtin.file:
path: /etc/apt/keyrings
state: directory
owner: root
group: root
mode: '0755'
- name: Download Docker repository signing key
ansible.builtin.get_url:
url: '{{ docker_repo_base }}/gpg'
dest: /etc/apt/keyrings/docker.asc
owner: root
group: root
mode: '0644'
force: true
- name: Configure Docker apt repository
ansible.builtin.apt_repository:
repo: 'deb [arch={{ docker_arch }} signed-by=/etc/apt/keyrings/docker.asc] {{ docker_repo_base }} {{ docker_repo_codename }} stable'
filename: docker
state: present
update_cache: true
- name: Install Docker Engine and plugins
ansible.builtin.apt:
name:
- docker-ce
- docker-ce-cli
- containerd.io
- docker-buildx-plugin
- docker-compose-plugin
state: present
- name: Enable and start Docker
ansible.builtin.service:
name: docker
enabled: true
state: started
- name: Run Docker verification image
ansible.builtin.command: docker run --rm hello-world
register: docker_hello_world
changed_when: true
failed_when: docker_hello_world.rc != 0On a first run, the verification task downloads the hello-world image, creates a container, prints Docker’s confirmation text and exits. It is not a persistent workload, so --rm removes the stopped container. A package change reports “changed”; subsequent runs should report no package or repository changes unless metadata, versions or service state actually differ.
Why the keyring permissions matter
The keyring directory must be searchable by the apt process, while the key file should be readable but not writable by ordinary users. A repository entry that omits signed-by can make trust broader than intended. If apt reports a missing public key, inspect both the path in the repository line and the file mode before recreating the key.
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Install Docker Engine on RHEL
RHEL hosts use dnf and Docker’s rpm repository. The maintained RHEL branch in the current manual covers major versions 8, 9 and 10. Repository installation is preferred when you want Docker’s normal update workflow rather than a potentially older distribution package.
- name: Install Docker Engine on RHEL
hosts: docker_hosts
become: true
gather_facts: true
tasks:
- name: Remove conflicting Docker packages
ansible.builtin.dnf:
name:
- docker
- docker-client
- docker-client-latest
- docker-common
- docker-latest
- docker-latest-logrotate
- docker-logrotate
- docker-engine
state: absent
- name: Install Docker repository definition
ansible.builtin.get_url:
url: https://download.docker.com/linux/rhel/docker-ce.repo
dest: /etc/yum.repos.d/docker-ce.repo
owner: root
group: root
mode: '0644'
- name: Install Docker Engine and plugins
ansible.builtin.dnf:
name:
- docker-ce
- docker-ce-cli
- containerd.io
- docker-buildx-plugin
- docker-compose-plugin
state: present
update_cache: true
- name: Enable and start Docker
ansible.builtin.systemd:
name: docker
enabled: true
state: startedKeep the repository task and package task separate so a failed repository download cannot be mistaken for a package-version problem. If your organization mirrors rpm content internally, replace the repository definition with the approved mirror while preserving the same package set and signature checks.
Verify the daemon independently of Ansible modules
When a run fails, test the host with the Docker CLI first. These commands distinguish a service failure from a Python or collection failure:
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docker version
docker info
docker run --rm hello-worldsystemctl status dockershows whether systemd started the daemon and includes recent startup errors.docker versionreports client and server API information. A client-only response usually means the Unix socket is unreachable.docker infoexposes storage-driver, cgroup, registry and runtime details useful for host troubleshooting.docker run --rm hello-worldchecks image retrieval, daemon operation, container creation and cleanup in one small transaction.
Do not treat a successful CLI command as proof that every Ansible module is ready. Modules can run under a different Python interpreter, on a different machine, or through a different Docker socket.
Install the Ansible Docker collection and Python SDK
Collection on the controller
community.docker is separate from ansible-core. Install it wherever Ansible resolves collections, normally the controller or execution environment:
ansible-galaxy collection install community.dockerThe current collection documentation identifies version 5.4.0 and requires ansible-core 2.17.0 or newer. For reproducible automation, pin the collection in requirements.yml and install it during image or control-node preparation:
collections:
- name: community.docker
version: 5.4.0ansible-galaxy collection install -r requirements.ymlPinning prevents an unattended collection update from changing module arguments or behavior. Schedule collection upgrades deliberately and test them against the same ansible-core version used in production.
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SDK on the machine that executes modules
Most community.docker modules require the Docker SDK for Python on the machine where the module runs. In a normal remote play, that is the target server, not the controller. Lookup plugins and other plugins execute in Ansible’s own context, so they may require the SDK on the controller or execution environment instead.
Install the SDK into the interpreter selected by ansible_python_interpreter. A system-package approach is simple on many distributions:
- name: Install Python package prerequisites
ansible.builtin.apt:
name:
- python3
- python3-docker
state: present
when: ansible_facts.os_family == 'Debian'
- name: Install Docker SDK in the selected interpreter
ansible.builtin.pip:
name: docker
executable: pip3
when: docker_use_pip | default(false)Use either the distribution package or a controlled virtual environment, not an accidental mixture of both. If the module says that the Docker SDK is missing, print the interpreter path with ansible_python_interpreter, run that interpreter’s python -c 'import docker; print(docker.__version__)', and install the SDK there. Installing it only on the controller will not fix a module that executes on the target.
Manage a container with community.docker.docker_container
After the daemon, collection and SDK are ready, define containers declaratively. The module supports check mode and requires Docker API 1.25 or newer. This example keeps the image, name, restart policy and port mapping explicit:
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hosts: docker_hosts
become: true
collections:
- community.docker
tasks:
- name: Ensure application container is present
community.docker.docker_container:
name: web
image: nginx:stable
state: started
pull: true
restart_policy: unless-stopped
published_ports:
- 127.0.0.1:8080:80The loopback binding deliberately limits exposure to the host. Bind to 0.0.0.0 only after reviewing the service’s access requirements and firewall policy. Use state: absent for removal, and use explicit volume, environment and health-check settings for a real application rather than relying on image defaults.
Run a proposed change without applying it:
ansible-playbook site.yml --check --diffCheck mode predicts many container changes, but image pulls, registry access and runtime-generated values can still make predictions incomplete. Validate the result on a staging host before changing a production container.
Use Compose v2 modules for multi-container applications
A single container is easier to model with docker_container. A workload with a database, network, volumes and several dependent services is better represented by a Compose file and the collection’s Compose v2 modules. Install the Compose plugin as part of the Engine package set, place the version-controlled file on the host, and invoke the v2 module from Ansible.
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- name: Deploy the Compose application
community.docker.docker_compose_v2:
project_src: /opt/myapp
state: present
pull: missingKeep secrets out of the Compose file and playbook source. Supply them through an approved secret mechanism, restrict file permissions and make the project directory ownership explicit. Treat the Compose file as the source of truth; avoid making manual container changes that the next reconciliation will undo.
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Idempotence means the same playbook converges on the same host state. Use state: present for packages, enabled: true and state: started for the service, stable repository files, fixed keyring modes and declarative container definitions. Avoid shell commands for tasks that have a dedicated Ansible module; reserve command for verification or operations without a suitable module.
There are two separate version decisions:
| Decision | Latest packages | Pinned packages |
|---|---|---|
| Benefit | Receives new fixes through the repository workflow. | Reproduces a tested host state across machines. |
| Cost | A later repository update can change behavior without a playbook edit. | Requires a maintenance process to review and advance versions. |
| Best fit | Fast-moving development or hosts with frequent validation. | Production fleets with change approval and rollback plans. |
If reproducibility matters, pin Docker package versions, the collection version and application image tags, then document the upgrade procedure. Test Engine, containerd, Compose and SDK changes together because they share the Docker API path.
Firewall and exposure considerations
Docker warns that published container ports can bypass rules managed only through ufw or firewalld. Publishing a port is therefore a network-policy change, not merely a container setting. Before exposing a service, decide which interfaces should listen, which source networks are allowed and where filtering will occur.
- Prefer loopback or a private interface when the service is consumed locally or through a reverse proxy.
- Review Docker’s supported iptables or ip6tables integration instead of inserting ad hoc rules that the daemon may reorder.
- Use the
DOCKER-USERchain for host-level filtering that should be evaluated before Docker’s own forwarding rules. - Test both IPv4 and IPv6 if the host has both enabled.
- Record published ports in the same change review as firewall rules.
A container that starts successfully can still be unintentionally reachable from the network. Verify from an allowed and a denied source after deployment.
Troubleshoot common failures
Apt reports an unsupported release or empty repository
Check the detected distribution and codename. Debian derivatives often identify themselves with a codename Docker does not publish. Set the repository codename to the supported upstream release only when Docker’s documentation says that mapping is valid; otherwise stop the rollout rather than installing packages from an unrelated branch.
The signing key is ignored
Confirm that /etc/apt/keyrings/docker.asc exists, is readable by apt, and matches the signed-by path character for character. Re-run the key download task and inspect the repository file for duplicate or stale entries.
The service will not start
Read journalctl -u docker -b and check for conflicts with an old container runtime, invalid daemon JSON, cgroup configuration or insufficient disk space. Removing conflicting packages does not remove a bad configuration file, so inspect /etc/docker/daemon.json separately.
Ansible says the Docker SDK is missing
Print the effective interpreter and install the SDK into that exact environment. Remember that a module running on a target needs the SDK on the target, while a plugin running in the controller context needs it on the controller or execution image.
Permission is denied on the Docker socket
The module is probably connecting to the Unix socket as a user outside the docker group, or it is using a different socket path. First test with privilege escalation. If non-root operation is required, manage group membership explicitly, reconnect the session so the new group is active, and understand that membership in the Docker group is effectively administrative access on the host.
hello-world cannot pull its image
Separate registry connectivity from daemon health. Check DNS, proxy settings, outbound firewall rules, registry credentials and the daemon’s journal. A successful package download proves only that the package manager can reach its repository.
The container module rejects the API
Compare the client and server values from docker version. The collection’s container module requires Docker API 1.25 or newer. Upgrade the Engine or use a collection/module combination compatible with the server instead of forcing an unsupported API setting.
A practical rollout sequence
- Inventory hosts by distribution family, release, architecture and Python interpreter.
- Validate each host against Docker’s current support matrix and stop unsupported combinations.
- Run the Debian/Ubuntu or RHEL role that removes conflicts, configures the signed repository and installs the five Engine components.
- Enable the service and verify it with systemd,
docker versionanddocker run --rm hello-world. - Install and pin
community.dockeron the controller or execution environment. - Install the Docker SDK in every interpreter that executes Docker modules or plugins.
- Deploy one non-critical container in check mode first, then apply it and inspect logs, ports and restart behavior.
- For multi-container applications, deploy the version-controlled Compose project with the Compose v2 module.
- Review firewall behavior from outside the host before publishing any production port.
- Record package, collection and image versions so upgrades can be tested and rolled back deliberately.
This sequence keeps operating-system changes, Ansible dependencies, container definitions and network exposure observable as separate steps. It also makes a failed run recoverable: fix the failing layer, rerun the idempotent role and verify the next layer only after the previous one is healthy.
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