Added a number of extra options to configure K3s in systemd unit file.

Testing:
  - Added docker networking, ensure that test output is verbose.
  - Fix build for AmazonLinux 2
  - No-deploy flag test added

.travis.yml

@@ -11,16 +11,24 @@ env:
   matrix:
     - MOLECULE_DISTRO: centos8
     - MOLECULE_DISTRO: centos7
-    - MOLECULE_DISTRO: ubuntu1804
     - MOLECULE_DISTRO: debian10
     - MOLECULE_DISTRO: fedora29
     - MOLECULE_DISTRO: fedora30
+    - MOLECULE_DISTRO: fedora31
     - MOLECULE_DISTRO: amazonlinux2
 
-    # Test other role features.
+    # Test installing docker
     - MOLECULE_DISTRO: centos7
       MOLECULE_PLAYBOOK: playbook-docker.yml
 
+    # Test using alternate port and using wireguard as the flannel backend
+    - MOLECULE_DISTRO: amazonlinux2
+      MOLECULE_PLAYBOOK: playbook-docker-altport-wireguard.yml
+
+    # Test disabling all deployments
+    - MOLECULE_DISTRO: fedora31
+      MOLECULE_PLAYBOOK: playbook-no-deploy.yml
+
 install:
   # Install test dependencies.
   - pip install molecule docker jmespath

README.md

@@ -9,12 +9,16 @@ Kubernetes") as either a standalone server or cluster.
 
 This role has been tested on Ansible 2.6.0+ against the following Linux Distributions:
 
+  - Amazon Linux 2
+  - CentOS 8
   - CentOS 7
   - Debian 9
   - Debian 10
+  - Fedora 29
+  - Fedora 30
+  - Fedora 31
   - openSUSE Leap 15
   - Ubuntu 18.04 LTS
-  - Amazon Linux 2
 
 ## Disclaimer
 
@@ -37,8 +41,18 @@ consistency.
 | `k3s_github_url`               | Set the GitHub URL to install k3s from.                                  | https://github.com/rancher/k3s |
 | `k3s_install_dir`              | Installation directory for k3s.                                          | `/usr/local/bin`               |
 | `k3s_control_workers`          | Are control hosts also workers?                                          | `true`                         |
-| `k3s_ensure_docker_installed ` | Use Docker rather than Containerd?                                       | `false`                        |
+| `k3s_https_port`               | HTTPS port listening port.                                               | 6443                           |
+| `k3s_use_docker`               | Use Docker rather than Containerd?                                       | `false`                        |
 | `k3s_no_flannel`               | Do not use Flannel                                                       | `false`                        |
+| `k3s_flannel_backend`          | Flannel backend ('none', 'vxlan', 'ipsec', or 'wireguard')               | vxlan                          |
+| `k3s_no_coredns`               | Do not use CoreDNS                                                       | `false`                        |
+| `k3s_cluster_dns`              | Cluster IP for CoreDNS service. Should be in your service-cidr range.    | _NULL_                         |
+| `k3s_cluster_domain`           | Cluster Domain.                                                          | cluster.local                  |
+| `k3s_no_traefik`               | Do not use Traefik                                                       | `false`                        |
+| `k3s_no_servicelb`             | Do not use ServiceLB, necessary for using something like MetalLB.        | `false`                        |
+| `k3s_disable_scheduler`        | Disable Kubernetes default scheduler                                     | `false`                        |
+| `k3s_disable_cloud_controller` | Disable k3s default cloud controller manager.                            | `false`                        |
+| `k3s_disable_network_policy`   | Disable k3s default network policy controller.                           | `false`                        |
 
 #### Important note about `k3s_release_version`
 
@@ -54,10 +68,16 @@ k3s_release_version: v0.2.0
 
 Below are variables that are set against specific hosts in your inventory.
 
-| Variable                | Description                                            | Default Value |
-|-------------------------|--------------------------------------------------------|---------------|
-| `k3s_control_node`      | Define the host as a control plane node, (True/False). | `false`       |
-| `k3s_flannel_interface` | Define the flannel proxy interface for this node.      |               |
+| Variable                    | Description                                            | Default Value |
+|-----------------------------|--------------------------------------------------------|---------------|
+| `k3s_control_node`          | Define the host as a control plane node, (True/False). | `false`       |
+| `k3s_node_name`             | Define the name of this node.                          | `$(hostname)` |
+| `k3s_flannel_interface`     | Define the flannel proxy interface for this node.      | _NULL_        |
+| `k3s_bind_address`          | Define the bind address for this node.                 | localhost     |
+| `k3s_node_ip_address`       | IP Address to advertise for this node.                 | _NULL_        |
+| `k3s_node_external_address` | External IP Address to advertise for this node.        | _NULL_        |
+| `k3s_node_labels`           | List of node labels.                                   | _NULL_        |
+| `k3s_node_taints`           | List of node taints.                                   | _NULL_        |
 
 #### Important note about `k3s_control_node`
 
@@ -73,6 +93,30 @@ If you are running k3s on systems with multiple network interfaces, it is
 necessary to have the flannel interface on a network interface that is routable
 to the master node(s).
 
+#### Notes about `k3s_node_labels` and `k3s_node_taints`
+
+Both these variables are lists that will be iterated on. The below example will
+output the following:
+
+**YAML**:
+
+```yaml
+k3s_node_labels:
+  - foo: bar
+  - hello: world
+
+k3s_node_taints:
+  - key1: value1:NoExecute
+```
+
+**ARGS**:
+
+```text
+--node-label foo=bar \
+--node-label hello=world \
+--node-taint key1=value1:NoExecute
+```
+
 ## Dependencies
 
 No dependencies on other roles.
@@ -84,7 +128,7 @@ Example playbook:
 ```yaml
 - hosts: k3s_nodes
   roles:
-     - { role: xanmanning.k3s, k3s_release_version: v0.2.0 }
+     - { role: xanmanning.k3s, k3s_release_version: v0.10.2 }
 ```
 
 ## License

defaults/main.yml

@@ -13,8 +13,41 @@ k3s_install_dir: /usr/local/bin
 # Are control hosts also worker nodes?
 k3s_control_workers: true
 
-# Ensure Docker is installed on nodes
-k3s_ensure_docker_installed: false
+# HTTPS Listening port
+k3s_https_port: 6443
 
-# Disable flannel
+# Ensure Docker is installed on nodes
+k3s_use_docker: false
+
+# Disable flannel, you will need to install your own CNI driver.
 k3s_no_flannel: false
+
+# Flannel backend ('none', 'vxlan', 'ipsec', or 'wireguard')
+k3s_flannel_backend: vxlan
+
+# Disable CoreDNS, you will need to install your own DNS provider.
+k3s_no_coredns: false
+
+# Cluster IP for CoreDNS service. Should be in your service-cidr range.
+# Use `false` to use default
+k3s_cluster_dns: false
+
+# Cluster Domain (default: "cluster.local")
+k3s_cluster_domain: cluster.local
+
+# Disable Traefik
+k3s_no_traefik: false
+
+# Disable Service Load Balancer, you will need to install your own
+# load balancer, such as MetalLB. Must be disabled if using your own
+# load balancer service.
+k3s_no_servicelb: false
+
+# Disable default k3s scheduler
+k3s_disable_scheduler: false
+
+# Disable k3s cloud controller
+k3s_disable_cloud_controller: false
+
+# Disable k3s network policy controller
+k3s_disable_network_policy: false

handlers/main.yml

@@ -3,18 +3,15 @@
 - name: reload systemd
   systemd:
     daemon_reload: true
-    # when: molecule_is_test is not defined
 
 - name: restart k3s
   service:
     name: k3s
     state: restarted
     enabled: true
-    # when: molecule_is_test is not defined
 
 - name: restart docker
   service:
     name: docker
     state: restarted
     enabled: true
-    # when: molecule_is_test is not defined

molecule/default/molecule.yml

@@ -14,6 +14,8 @@ platforms:
       - /sys/fs/cgroup:/sys/fs/cgroup:ro
     privileged: true
     pre_build_image: true
+    networks:
+      - name: k3snet
   - name: node2
     image: "geerlingguy/docker-${MOLECULE_DISTRO:-centos8}-ansible:latest"
     command: ${MOLECULE_DOCKER_COMMAND:-""}
@@ -21,6 +23,8 @@ platforms:
       - /sys/fs/cgroup:/sys/fs/cgroup:ro
     privileged: true
     pre_build_image: true
+    networks:
+      - name: k3snet
   - name: node3
     image: "geerlingguy/docker-${MOLECULE_DISTRO:-centos8}-ansible:latest"
     command: ${MOLECULE_DOCKER_COMMAND:-""}
@@ -28,8 +32,12 @@ platforms:
       - /sys/fs/cgroup:/sys/fs/cgroup:ro
     privileged: true
     pre_build_image: true
+    networks:
+      - name: k3snet
 provisioner:
   name: ansible
+  options:
+    verbose: true
   lint:
     name: ansible-lint
   playbooks:

molecule/default/playbook-docker-altport-wireguard.yml

@@ -0,0 +1,13 @@
+---
+- name: Converge
+  hosts: all
+  become: true
+  vars:
+    molecule_is_test: true
+    k3s_use_docker: true
+    k3s_https_port: 26443
+    k3s_flannel_backend: wireguard
+    k3s_cluster_domain: examplecluster.local
+    k3s_control_workers: false
+  roles:
+    - role: xanmanning.k3s

molecule/default/playbook-docker.yml

@@ -4,6 +4,6 @@
   become: true
   vars:
     molecule_is_test: true
-    k3s_ensure_docker_installed: true
+    k3s_use_docker: true
   roles:
     - role: xanmanning.k3s

molecule/default/playbook-no-deploy.yml

@@ -0,0 +1,21 @@
+---
+- name: Converge
+  hosts: all
+  become: true
+  vars:
+    molecule_is_test: true
+    k3s_no_flannel: true
+    k3s_no_coredns: true
+    k3s_no_traefik: true
+    k3s_no_servicelb: true
+    k3s_disable_scheduler: true
+    k3s_disable_cloud_controller: true
+    k3s_disable_network_policy: true
+    k3s_control_workers: false
+    k3s_node_labels:
+      - foo: bar
+      - hello: world
+    k3s_node_taints:
+      - key1: value1:NoExecute
+  roles:
+    - role: xanmanning.k3s

tasks/configure-k3s-cluster.yml

@@ -43,7 +43,7 @@
 
 - name: Wait for control plane to be ready to accept connections
   wait_for:
-    port: 6443
+    port: "{{ k3s_https_port }}"
     delay: 5
     sleep: 5
     timeout: 300

tasks/install-docker-amazon.yml

@@ -0,0 +1,10 @@
+---
+
+- name: Ensure docker is installed using amazon-linux-extras
+  command: amazon-linux-extras install docker
+  args:
+    creates: /etc/docker
+  notify:
+    - restart docker
+
+- meta: flush_handlers

tasks/install-docker-prerequisites-redhat.yml

@@ -21,3 +21,4 @@
     enabled: true
     gpgcheck: true
     state: present
+  when: ansible_distribution | lower not in ['amazon']

tasks/install-k3s.yml

@@ -21,10 +21,11 @@
     - k3s
     - kubectl
     - crictl
+    - ctr
 
 - name: Ensure k3s control plane is started
   service:
     name: k3s
     state: started
     enabled: true
-  when: k3s_control_node  # and molecule_is_test is not defined
+  when: k3s_control_node

tasks/main.yml

@@ -1,17 +1,27 @@
 ---
 
 - import_tasks: preconfigure-k3s.yml
-- include_tasks: install-docker-prerequisites-{{ ansible_os_family|lower }}.yml
-  when: k3s_ensure_docker_installed
+
+- include_tasks: install-docker-prerequisites-{{ ansible_os_family | lower }}.yml
+  when: k3s_use_docker
         and ((k3s_control_workers)
              or (not k3s_control_workers and not k3s_control_node))
-- include_tasks: install-docker.yml
-  when: k3s_ensure_docker_installed
+
+- import_tasks: install-docker.yml
+  when: k3s_use_docker
         and ((k3s_control_workers)
            or (not k3s_control_workers and not k3s_control_node))
-- include_tasks: get-version.yml
+        and ansible_distribution | lower not in ['amazon']
+
+- include_tasks: install-docker-{{ ansible_distribution | lower }}.yml
+  when: ansible_distribution | lower in ['amazon']
+
+- import_tasks: get-version.yml
   when: k3s_release_version is not defined or not k3s_release_version
+
 - import_tasks: download-k3s.yml
+
 - import_tasks: install-k3s.yml
-- include_tasks: configure-k3s-cluster.yml
+
+- import_tasks: configure-k3s-cluster.yml
   when: play_hosts | length > 1

templates/k3s.service.j2

@@ -7,11 +7,78 @@ After=network.target
 Type={{ 'notify' if k3s_control_node else 'exec' }}
 ExecStartPre=-/sbin/modprobe br_netfilter
 ExecStartPre=-/sbin/modprobe overlay
+{% filter replace('\n', ' ') %}
+ExecStart={{ k3s_install_dir }}/k3s
 {% if k3s_control_node %}
-ExecStart={{ k3s_install_dir }}/k3s server{{ ' --disable-agent' if not k3s_control_workers else '' }}{{ ' --flannel-iface ' + k3s_flannel_interface if k3s_flannel_interface is defined and not k3s_no_flannel else '' }}{{ ' --no-flannel' if k3s_no_flannel else '' }}{{ ' --docker' if k3s_ensure_docker_installed else '' }}
+    server{{ ' --disable-agent' if not k3s_control_workers else '' }}
+    {% if k3s_https_port != 6443 %}
+        --https-listen-port {{ k3s_https_port }}
+    {% endif %}
+    {% if k3s_disable_scheduler %}
+        --disable-scheduler
+    {% endif %}
+    {% if k3s_disable_cloud_controller %}
+        --disable-cloud-controller
+    {% endif %}
+    {% if k3s_disable_network_policy %}
+        --disable-network-policy
+    {% endif %}
+    {% if k3s_no_flannel %}
+        --no-flannel
+    {% endif %}
+    {% if k3s_flannel_backend != "vxlan" and not k3s_no_flannel %}
+        --flannel-backend {{ k3s_flannel_backend }}
+    {% endif %}
+    {% if k3s_no_coredns is defined or k3s_no_traefik is defined or k3s_no_servicelb is defined %}
+    {% if k3s_no_coredns or k3s_no_traefik or k3s_no_servicelb %}
+        {{ ' --no-deploy coredns' if k3s_no_coredns else '' }}{{ ' --no-deploy servicelb' if k3s_no_servicelb else '' }}{{ ' --no-deploy traefik' if k3s_no_traefik else '' }}
+    {% endif %}
+    {% endif %}
+    {% if k3s_cluster_dns is defined and k3s_cluster_dns %}
+        --cluster-dns {{ k3s_cluster_dns }}
+    {% endif %}
+    {% if k3s_cluster_domain is defined and k3s_cluster_domain != "cluster.local" %}
+        --cluster-domain {{ k3s_cluster_domain }}
+    {% endif %}
 {% else %}
-ExecStart={{ k3s_install_dir }}/k3s agent{{ ' --docker' if k3s_ensure_docker_installed else '' }}{{ ' --flannel-iface ' + k3s_flannel_interface if k3s_flannel_interface is defined and not k3s_no_flannel else '' }}{{ ' --no-flannel' if k3s_no_flannel else '' }} --server https://{{ k3s_control_node_address }}:6443 --token {{ k3s_control_token.content | b64decode }}
+    agent
+    --server https://{{ k3s_control_node_address }}:{{ k3s_https_port }}
+    --token {{ k3s_control_token.content | b64decode }}
 {% endif %}
+{% if k3s_use_docker %}
+    --docker
+{% endif %}
+{% if k3s_flannel_interface is defined and not k3s_no_flannel %}
+     --flannel-iface {{ k3s_flannel_interface }}
+{% endif %}
+{% if k3s_bind_address is defined %}
+    --bind-address {{ k3s_bind_address }}
+{% endif %}
+{% if k3s_node_name is defined %}
+    --node-name {{ k3s_node_name }}
+{% endif %}
+{% if k3s_node_ip_address is defined %}
+    --node-ip {{ k3s_node_ip_address }}
+{% endif %}
+{% if k3s_node_external_address is defined %}
+    --node-external-ip {{ k3s_node_external_address }}
+{% endif %}
+{% if k3s_node_labels is defined and k3s_node_labels is iterable %}
+    {% for label in k3s_node_labels %}
+        {% for key, value in label.items() %}
+            --node-label {{ key }}={{ value }}
+        {% endfor %}
+    {% endfor %}
+{% endif %}
+{% if k3s_node_taints is defined and k3s_node_taints is iterable %}
+    {% for taint in k3s_node_taints %}
+        {% for key, value in taint.items() %}
+            --node-taint {{ key }}={{ value }}
+        {% endfor %}
+    {% endfor %}
+{% endif %}
+{% endfilter %}
+
 KillMode=process
 Delegate=yes
 LimitNOFILE=infinity