Deploy kubernetes v1.20.1

Kubernetes v1.20 drops support for docker and this role currently uses
    containerd as to container runtime.

    crictl is installed to inspect and query conainers on the host

defaults/main.yml

@@ -11,6 +11,8 @@ kubernetes_packages:
 
 kubernetes_version: '1.19'
 kubernetes_version_rhel_package: '1.19.0'
+kubernetes_kubeadm_version: 'v1.19.0'
+crictl_version: 'v1.19.0'
 
 kubernetes_role: master
 

handlers/main.yml

@@ -1,3 +1,6 @@
 ---
 - name: restart kubelet
   service: name=kubelet state=restarted
+
+- name: restart containerd
+  service: name=containerd state=restarted

tasks/containerd.yml

@@ -0,0 +1,8 @@
+- name: Create the containerd folder in /etc.
+  file:
+    path: /etc/containerd
+    state: directory
+
+- name: Generate a containerd config.
+  shell: containerd config default > /etc/containerd/config.toml
+  notify: restart containerd

tasks/crictl.yml

@@ -0,0 +1,17 @@
+- name: Download crictl tarball
+  get_url:
+    url: "https://github.com/kubernetes-sigs/cri-tools/releases/download/{{ crictl_version }}/crictl-{{ crictl_version }}-linux-amd64.tar.gz"
+    dest: "/tmp/crictl-{{ crictl_version }}-linux-amd64.tar.gz"
+
+- name: Extract crictl into /usr/local/bin
+  unarchive:
+    src: "/tmp/crictl-{{ crictl_version }}-linux-amd64.tar.gz"
+    dest: /usr/local/bin/crictl
+    remote_src: yes
+    mode: 0751
+
+- name: Create crictl config
+  template:
+    src: crictl-config.j2
+    dest: /etc/crictl.yaml
+    mode: 0644

tasks/main.yml

@@ -20,6 +20,10 @@
 
 - include_tasks: sysctl-setup.yml
 
+- include_tasks: containerd.yml
+
+- include_tasks: crictl.yml
+
 - include_tasks: kubelet-setup.yml
 
 - name: Ensure kubelet is started and enabled at boot.

tasks/master-setup.yml

@@ -15,6 +15,9 @@
     dest: ~/.kube/kubeadm-config.yml
     mode: 0644
 
+- name: Pull core kubernetes images.
+  command: kubeadm config images pull
+
 - name: Initialize Kubernetes master with kubeadm init.
   command: >
     kubeadm init

tasks/setup-Debian.yml

@@ -4,6 +4,7 @@
     name:
       - apt-transport-https
       - ca-certificates
+      - containerd
     state: present
 
 - name: Add Kubernetes apt key.

tasks/sysctl-setup.yml

@@ -7,6 +7,17 @@
     ansible_distribution != 'Debian'
     or ansible_distribution_major_version | int < 10
 
+- name: Ensure the kernel modules are loaded.
+  modprobe:
+    name: "{{ item }}"
+    state: present
+  loop:
+    - overlay
+    - br_netfilter
+  when: >
+    ansible_distribution != 'Debian'
+    or ansible_distribution_major_version | int < 10
+
 # See: https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/install-kubeadm/#letting-iptables-see-bridged-traffic
 - name: Let iptables see bridged traffic.
   sysctl:
@@ -19,3 +30,6 @@
   when: >
     ansible_distribution != 'Debian'
     or ansible_distribution_major_version | int < 10
+
+- name: Enable ip forwarding.
+  shell: echo '1' > /proc/sys/net/ipv4/ip_forward

templates/crictl-config.j2

@@ -0,0 +1,6 @@
+runtime-endpoint: "unix:///run/containerd/containerd.sock"
+image-endpoint: "unix:///run/containerd/containerd.sock"
+timeout: 2
+debug: false
+pull-image-on-create: false
+disable-pull-on-run: false

templates/kubeadm-config.j2

@@ -12,7 +12,7 @@ localAPIEndpoint:
   advertiseAddress: {{ kubernetes_apiserver_advertise_address | default(ansible_default_ipv4.address, true) }}
   bindPort: 6443
 nodeRegistration:
-  criSocket: /var/run/dockershim.sock
+  criSocket: /run/containerd/containerd.sock
   name: node1
   taints:
   - effect: NoSchedule
@@ -24,14 +24,13 @@ apiServer:
   timeoutForControlPlane: 4m0s
 certificatesDir: /etc/kubernetes/pki
 clusterName: kubernetes
-controllerManager: {}
 dns:
   type: CoreDNS
 etcd:
   local:
     dataDir: /var/lib/etcd
 imageRepository: k8s.gcr.io
-kubernetesVersion: v1.17.0
+kubernetesVersion: {{ kubernetes_kubeadm_version }}
 networking:
   dnsDomain: cluster.local
   serviceSubnet: 10.96.0.0/12
@@ -39,4 +38,8 @@ networking:
 controllerManager:
   extraArgs:
     node-cidr-mask-size: "{{ kubernetes_kube_controller_manager_node_cidr_mask_size }}"
-scheduler: {}
+scheduler: {}
+---
+apiVersion: kubelet.config.k8s.io/v1beta1
+kind: KubeletConfiguration
+cgroupDriver: containerd