diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index c145caa..fb4a138 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -4,7 +4,7 @@
 
 repos:
   - repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: v4.2.0
+    rev: v4.4.0
     hooks:
       - id: trailing-whitespace
         args:
@@ -13,16 +13,17 @@ repos:
       - id: check-yaml
       - id: check-added-large-files
   - repo: https://github.com/markdownlint/markdownlint
-    rev: v0.11.0
+    rev: v0.12.0
     hooks:
       - id: markdownlint
         args:
           - -r "~MD013"   # ignore line-length rule
   - repo: https://github.com/ansible-community/ansible-lint
-    rev: v6.1.0
+    rev: v6.9.0
     hooks:
       - id: ansible-lint
+        exclude: ^cloud-init/
   - repo: https://github.com/hadolint/hadolint
-    rev: v2.10.0
+    rev: v2.12.1-beta
     hooks:
       - id: hadolint
diff --git a/cloud-init/base.yaml b/cloud-init/base.yaml
new file mode 100644
index 0000000..2698f1c
--- /dev/null
+++ b/cloud-init/base.yaml
@@ -0,0 +1,21 @@
+#cloud-config
+
+# Sources:
+# - https://github.com/trajano/terraform-docker-swarm-aws/blob/master/common.cloud-config
+
+# Upgrade the instance
+# Deactivated as this could take a long time if the image is old
+# https://cloudinit.readthedocs.io/en/latest/topics/modules.html#package-update-upgrade-install
+# https://cloudinit.readthedocs.io/en/latest/topics/examples.html#run-apt-or-yum-upgrade
+package_upgrade: false
+package_reboot_if_required: false
+
+# Install required packages
+# This will always update the list of packages, regardless of package_update's value.
+# https://cloudinit.readthedocs.io/en/latest/topics/modules.html#package-update-upgrade-install
+# https://cloudinit.readthedocs.io/en/latest/topics/examples.html#install-arbitrary-packages
+packages:
+  - jq
+  - nc
+  - traceroute
+  - unzip
diff --git a/cloud-init/docker.yum.yaml b/cloud-init/docker.yum.yaml
new file mode 100644
index 0000000..d905425
--- /dev/null
+++ b/cloud-init/docker.yum.yaml
@@ -0,0 +1,37 @@
+#cloud-config
+
+# Sources:
+# - https://github.com/trajano/terraform-docker-swarm-aws/blob/master/common.cloud-config
+
+# Add the Docker repository
+# https://cloudinit.readthedocs.io/en/latest/topics/modules.html#yum-add-repo
+# https://cloudinit.readthedocs.io/en/latest/topics/examples.html#adding-a-yum-repository
+#
+# Got from the official installation guide at
+# https://docs.docker.com/engine/install/rhel/#install-using-the-repository :
+#   yum install -y yum-utils && \
+#   yum-config-manager --add-repo \
+#     https://download.docker.com/linux/rhel/docker-ce.repo && \
+#   cat /etc/yum.repos.d/docker-ce.repo
+yum_repos:
+  docker-ce:
+    name: Docker CE Stable - $basearch
+    enabled: true
+    baseurl: https://download.docker.com/linux/rhel/$releasever/$basearch/stable
+    priority: 1
+    gpgcheck: true
+    gpgkey: https://download.docker.com/linux/rhel/gpg
+
+# Install required packages
+# This will always update the list of packages, regardless of package_update's value.
+# https://cloudinit.readthedocs.io/en/latest/topics/modules.html#package-update-upgrade-install
+# https://cloudinit.readthedocs.io/en/latest/topics/examples.html#install-arbitrary-packages
+#
+# docker-ce already depends on docker-ce-cli and containerd.io
+packages:
+  - docker-ce
+
+# Enable and start the service after installation
+runcmd:
+  - systemctl daemon-reload
+  - systemctl enable --now docker.service
diff --git a/knowledge base/cloud-init.md b/knowledge base/cloud-init.md
index 468a072..e4f9d1a 100644
--- a/knowledge base/cloud-init.md	
+++ b/knowledge base/cloud-init.md	
@@ -36,24 +36,15 @@ sudo cloud-init clean
 
 # Re-run everything.
 sudo cloud-init init
+
+# Check the user scripts.
+ls '/var/lib/cloud/instance/scripts'
 ```
 
 ```yaml
 #cloud-config
 
-# Sources:
-# - https://github.com/trajano/terraform-docker-swarm-aws/blob/master/common.cloud-config
-
 # Add the Docker repository
-# https://cloudinit.readthedocs.io/en/latest/topics/modules.html#yum-add-repo
-# https://cloudinit.readthedocs.io/en/latest/topics/examples.html#adding-a-yum-repository
-#
-# Got from the official installation guide at
-# https://docs.docker.com/engine/install/rhel/#install-using-the-repository :
-#   yum install -y yum-utils && \
-#   yum-config-manager --add-repo \
-#     https://download.docker.com/linux/rhel/docker-ce.repo && \
-#   cat /etc/yum.repos.d/docker-ce.repo
 yum_repos:
   docker-ce:
     name: Docker CE Stable - $basearch
@@ -64,17 +55,10 @@ yum_repos:
     gpgkey: https://download.docker.com/linux/rhel/gpg
 
 # Upgrade the instance
-# Deactivated as this could take a long time if the image is old
-# https://cloudinit.readthedocs.io/en/latest/topics/modules.html#package-update-upgrade-install
-# https://cloudinit.readthedocs.io/en/latest/topics/examples.html#run-apt-or-yum-upgrade
-package_upgrade: false
-package_reboot_if_required: false
+package_upgrade: true
+package_reboot_if_required: true
 
 # Install required packages
-# This will always update the list of packages, regardless of package_update's value.
-# https://cloudinit.readthedocs.io/en/latest/topics/modules.html#package-update-upgrade-install
-# https://cloudinit.readthedocs.io/en/latest/topics/examples.html#install-arbitrary-packages
-#
 # docker-ce already depends on docker-ce-cli and containerd.io
 packages:
   - docker-ce
@@ -162,22 +146,30 @@ merge_type: 'list(append)+dict(recurse_array)+str()'
 - [Merging User-Data sections]
 - [cloud-init multipart encoding issues]
 - [Test cloud-init with a multipass container]
+- [Mime Multi Part Archive] format
+- [Docker cloud init example]
 
 ## Sources
 
 - [Debugging cloud-init]
 - [Tutorial]
 - [Cloud-Init configuration merging]
+- [Terraform's cloud-init provider]
 
 <!-- cloud-init documentation -->
 [debugging cloud-init]: https://cloudinit.readthedocs.io/en/latest/topics/debugging.html
 [examples]: https://cloudinit.readthedocs.io/en/latest/topics/examples.html
 [merging user-data sections]: https://cloudinit.readthedocs.io/en/latest/topics/merging.html
 [modules]: https://cloudinit.readthedocs.io/en/latest/topics/modules.html
+[mime multi part archive]: https://cloudinit.readthedocs.io/en/latest/topics/format.html#mime-multi-part-archive
 [tutorial]: https://cloudinit.readthedocs.io/en/latest/topics/tutorial.html
 [website]: https://cloud-init.io/
 
+<!-- internal references -->
+[docker cloud init example]: ../cloud-init/docker.yaml
+
 <!-- external references -->
 [cloud-init configuration merging]: https://jen20.dev/post/cloudinit-configuration-merging/
 [cloud-init multipart encoding issues]: https://github.com/hashicorp/terraform/issues/4794
 [test cloud-init with a multipass container]: https://medium.com/open-devops-academy/test-cloud-init-with-a-multipass-containers-e3e3bb740604
+[terraform's cloud-init provider]: https://registry.terraform.io/providers/hashicorp/cloudinit/latest/docs/data-sources/cloudinit_config