- updated raspbian to latest stable (2020-02-14) because pi 4B 8G bou…

…ght 15/03/2021 complained for too old firmware

- updated kubernetes version to latest stable (1.20.4)
- updated flannel to latest stable (0.13.0)
- fixed haproxy.cfg bug where haproxy complained about equal backend and frontend names
- fixed kubeadm init error wrongly reporting insufficient memory on pi 4B 8GiB (known bug #kubernetes/kubeadm/issues/2365)

Makefile

@@ -30,8 +30,8 @@ WIFI_SSID     ?=
 WIFI_PASSWORD ?=
 
 # Raspbian image configuration
-RASPBIAN_VERSION       = raspbian_lite-2019-09-30
-RASPBIAN_IMAGE_VERSION = 2019-09-26-raspbian-buster-lite
+RASPBIAN_VERSION       = raspbian_lite-2020-02-14
+RASPBIAN_IMAGE_VERSION = 2020-02-13-raspbian-buster-lite
 RASPBIAN_URL           = https://downloads.raspberrypi.org/raspbian_lite/images/$(RASPBIAN_VERSION)/$(RASPBIAN_IMAGE_VERSION).zip
 
 ##@ Build

README.md

@@ -15,7 +15,7 @@ used to build the SD cards:
 - Linux - Because of filesystem requirements
 - `bash` - 4.0+
 - `make` - 4.1+
-- [kubectl](https://kubernetes.io/docs/tasks/tools/install-kubectl/) - 1.16.1
+- [kubectl](https://kubernetes.io/docs/tasks/tools/install-kubectl/) - 1.20.4
 - 4 Raspberry Pis (3 Masters and 1 Worker)
 
 ## Applications
@@ -25,12 +25,12 @@ using `haproxy` and `keepalived` for cluster management.
 
 See below for a list of the versions and applications used:
 
-- [Raspbian](https://downloads.raspberrypi.org/raspbian_lite/images/) - raspbian_lite-2019-09-30
-- [Kubernetes](https://kubernetes.io/) - 1.16.1
+- [Raspbian](https://downloads.raspberrypi.org/raspbian_lite/images/) - raspbian_lite-2020-02-14
+- [Kubernetes](https://kubernetes.io/) - 1.20.4
 - [Docker](https://www.docker.com/) - 19.03.9
 - [HA Proxy](http://www.haproxy.org/) - 1.8.19
 - [Keepalived](https://www.keepalived.org/) - 2.0.10
-- [Flannel](https://raw.githubusercontent.com/coreos/flannel/2140ac876ef134e0ed5af15c65e414cf26827915/Documentation/kube-flannel.yml) - As per instructions on kubeadm installation page
+- [Flannel](https://raw.githubusercontent.com/flannel-io/flannel/v0.13.0/Documentation/kube-flannel.yml) - As per instructions on kubeadm installation page
 
 ## Configuration
 

raspbernetes/conf/kubernetes.sh

@@ -1,8 +1,8 @@
 #!/bin/bash
 set -euo pipefail
 
-flannel_version="2140ac876ef134e0ed5af15c65e414cf26827915"
-flannel_url="https://raw.githubusercontent.com/coreos/flannel/${flannel_version}/Documentation/kube-flannel.yml"
+flannel_version="v0.13.0"
+flannel_url="https://raw.githubusercontent.com/flannel-io/flannel/${flannel_version}/Documentation/kube-flannel.yml"
 pi_home="/home/pi"
 kube_finished="${pi_home}/kube-finished-booting"
 
@@ -118,7 +118,8 @@ init_master() {
     --pod-network-cidr "10.244.0.0/16" \
     --control-plane-endpoint "${KUBE_MASTER_VIP}:6443" \
     --skip-token-print \
-    --skip-certificate-key-print
+    --skip-certificate-key-print \
+    --ignore-preflight-errors=Mem
 
   # setup flannel
   kubectl --kubeconfig=/etc/kubernetes/admin.conf apply -f "${flannel_url}"

raspbernetes/install/docker.sh

@@ -1,12 +1,12 @@
 #!/bin/bash
 set -euo pipefail
 
-docker_version="5:19.03.9~3-0~raspbian-stretch"
+docker_version="5:19.03.9~3-0~raspbian-buster"
 
 # add repo list
 curl -fsSL https://download.docker.com/linux/raspbian/gpg | apt-key add -
 cat << EOF >> /etc/apt/sources.list.d/docker.list
-deb [arch=armhf] https://download.docker.com/linux/raspbian stretch stable
+deb [arch=armhf] https://download.docker.com/linux/raspbian buster stable
 EOF
 
 # update mirrors and install docker

raspbernetes/install/haproxy.sh

@@ -16,9 +16,9 @@ frontend kube-api
   mode tcp
   option tcplog
   timeout client 4h
-  default_backend kube-api
+  default_backend kube-api-be
 
-backend kube-api
+backend kube-api-be
   mode tcp
   option tcp-check
   timeout server 4h

raspbernetes/install/kubernetes.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 set -euo pipefail
 
-kube_version="1.16.1-00"
+kube_version="1.20.4-00"
 kube_packages=("kubelet=${kube_version}" "kubectl=${kube_version}" "kubeadm=${kube_version}")
 
 echo "Disabling swap and ensuring it doesn't turn back on after reboot"