[baseimage]: Install Kubernetes packages if enabled in image

Makefile.work

@@ -9,6 +9,7 @@
 #    through http.
 #  * ENABLE_ZTP: Enables zero touch provisioning.
 #  * SHUTDOWN_BGP_ON_START: Sets admin-down state for all bgp peerings after restart.
+#  * INSTALL_KUBERNETES: Allows including Kubernetes
 #  * ENABLE_PFCWD_ON_START: Enable PFC Watchdog (PFCWD) on server-facing ports
 #  * by default for TOR switch.
 #  * ENABLE_SYNCD_RPC: Enables rpc-based syncd builds.
@@ -176,6 +177,10 @@ SONIC_BUILD_INSTRUCTION :=  make \
                            ENABLE_DHCP_GRAPH_SERVICE=$(ENABLE_DHCP_GRAPH_SERVICE) \
                            ENABLE_ZTP=$(ENABLE_ZTP) \
                            SHUTDOWN_BGP_ON_START=$(SHUTDOWN_BGP_ON_START) \
+                           INSTALL_KUBERNETES=$(INSTALL_KUBERNETES) \
+                           KUBERNETES_VERSION=$(KUBERNETES_VERSION) \
+                           K8s_GCR_IO_PAUSE_VERSION=$(K8s_GCR_IO_PAUSE_VERSION) \
+                           K8s_CNI_CALICO_VERSION=$(K8s_CNI_CALICO_VERSION) \
                            SONIC_ENABLE_PFCWD_ON_START=$(ENABLE_PFCWD_ON_START) \
                            SONIC_ENABLE_SYNCD_RPC=$(ENABLE_SYNCD_RPC) \
                            SONIC_INSTALL_DEBUG_TOOLS=$(INSTALL_DEBUG_TOOLS) \

build_debian.sh

@@ -208,6 +208,22 @@ sudo LANG=C chroot $FILESYSTEM_ROOT apt-get update
 sudo LANG=C chroot $FILESYSTEM_ROOT apt-get -y install docker-ce=${DOCKER_VERSION}
 sudo LANG=C chroot $FILESYSTEM_ROOT apt-get -y remove software-properties-common gnupg2
 
+if [ "$INSTALL_KUBERNETES" == "y" ]
+then
+    ## Install Kubernetes
+    echo '[INFO] Install kubernetes'
+    sudo https_proxy=$https_proxy LANG=C chroot $FILESYSTEM_ROOT curl -fsSL \
+        https://packages.cloud.google.com/apt/doc/apt-key.gpg | \
+        sudo LANG=C chroot $FILESYSTEM_ROOT apt-key add -
+    ## Check out the sources list update matches current Debian version
+    sudo cp files/image_config/kubernetes/kubernetes.list $FILESYSTEM_ROOT/etc/apt/sources.list.d/
+    sudo LANG=C chroot $FILESYSTEM_ROOT apt-get update
+    sudo LANG=C chroot $FILESYSTEM_ROOT apt-get -y install kubeadm=${KUBERNETES_VERSION}-00
+    # kubeadm package auto install kubelet & kubectl
+else
+    echo '[INFO] Skipping Install kubernetes'
+fi
+
 ## Add docker config drop-in to specify dockerd command line
 sudo mkdir -p $FILESYSTEM_ROOT/etc/systemd/system/docker.service.d/
 ## Note: $_ means last argument of last command

files/build_templates/sonic_debian_extension.j2

@@ -245,6 +245,13 @@ sudo https_proxy=$https_proxy LANG=C chroot $FILESYSTEM_ROOT pip install azure-s
 sudo https_proxy=$https_proxy LANG=C chroot $FILESYSTEM_ROOT pip install watchdog
 sudo https_proxy=$https_proxy LANG=C chroot $FILESYSTEM_ROOT pip install futures
 
+{% if install_kubernetes == "y" %}
+# Copy kubelet service files
+# Keep it disabled until join, else it continuously restart and as well spew too many
+# non-required log lines wasting syslog resources.
+sudo LANG=C chroot $FILESYSTEM_ROOT systemctl disable kubelet.service
+{% endif %}
+
 # Copy the buffer configuration template
 sudo cp $BUILD_TEMPLATES/buffers_config.j2 $FILESYSTEM_ROOT_USR_SHARE_SONIC_TEMPLATES/
 
@@ -401,6 +408,18 @@ sudo LANG=C chroot $FILESYSTEM_ROOT docker $SONIC_NATIVE_DOCKERD_FOR_DOCKERFS ta
 sudo LANG=C chroot $FILESYSTEM_ROOT docker $SONIC_NATIVE_DOCKERD_FOR_DOCKERFS tag {{imagename}}:latest {{imagebasename}}:latest
 {% endif %}
 {% endfor %}
+
+{% if install_kubernetes == "y" %}
+## Pull in kubernetes docker images
+echo "pulling universal k8s images ..."
+sudo https_proxy=$https_proxy LANG=C chroot $FILESYSTEM_ROOT docker pull k8s.gcr.io/pause:${K8s_GCR_IO_PAUSE_VERSION}
+sudo https_proxy=$https_proxy LANG=C chroot $FILESYSTEM_ROOT docker pull k8s.gcr.io/kube-proxy:v${KUBERNETES_VERSION}
+sudo https_proxy=$https_proxy LANG=C chroot $FILESYSTEM_ROOT docker pull calico/node:v${K8s_CNI_CALICO_VERSION}
+sudo https_proxy=$https_proxy LANG=C chroot $FILESYSTEM_ROOT docker pull calico/pod2daemon-flexvol:v${K8s_CNI_CALICO_VERSION}
+sudo https_proxy=$https_proxy LANG=C chroot $FILESYSTEM_ROOT docker pull calico/cni:v${K8s_CNI_CALICO_VERSION}
+echo "docker images pull complete"
+{% endif %}
+
 sudo umount $FILESYSTEM_ROOT/target
 sudo rm -r $FILESYSTEM_ROOT/target
 if [[ $CONFIGURED_ARCH == armhf || $CONFIGURED_ARCH == arm64 ]]; then

files/image_config/kubernetes/kubernetes.list

@@ -0,0 +1,4 @@
+# The following is as recommended by https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/install-kubeadm/
+# Whenever an OS update from Debian stretch is done, make sure to find the matching k8s sources list
+#
+deb https://apt.kubernetes.io/ kubernetes-xenial main

rules/config

@@ -131,3 +131,17 @@ ENABLE_RESTAPI = n
 # ENABLE_NAT - build docker-sonic-nat for nat support
 ENABLE_NAT = y
 
+# INSTALL_KUBERNETES - if set to y kubernetes packages are installed to be able to
+# run as worker node in kubernetes cluster.
+INSTALL_KUBERNETES = n
+
+# KUBERNETES_VERSION - Set to the required version.
+# K8s_GCR_IO_PAUSE_VERSION - Version of k8s universal pause container image
+# K8s_CNI_CALICO_VERSION - Calico used as CNI; Appropriate version for this Kubernetes version
+# These are Used *only* when INSTALL_KUBERNETES=y
+# NOTE: As a worker node it has to run version compatible to kubernetes master.
+#
+KUBERNETES_VERSION = 1.18.0
+K8s_GCR_IO_PAUSE_VERSION = 3.2
+K8s_CNI_CALICO_VERSION = 3.12.0
+

slave.mk

@@ -191,6 +191,7 @@ $(info "USERNAME"                        : "$(USERNAME)")
 $(info "PASSWORD"                        : "$(PASSWORD)")
 $(info "ENABLE_DHCP_GRAPH_SERVICE"       : "$(ENABLE_DHCP_GRAPH_SERVICE)")
 $(info "SHUTDOWN_BGP_ON_START"           : "$(SHUTDOWN_BGP_ON_START)")
+$(info "INSTALL_KUBERNETES"              : "$(INSTALL_KUBERNETES)")
 $(info "ENABLE_PFCWD_ON_START"           : "$(ENABLE_PFCWD_ON_START)")
 $(info "INSTALL_DEBUG_TOOLS"             : "$(INSTALL_DEBUG_TOOLS)")
 $(info "ROUTING_STACK"                   : "$(SONIC_ROUTING_STACK)")
@@ -769,6 +770,7 @@ $(addprefix $(TARGET_PATH)/, $(SONIC_INSTALLERS)) : $(TARGET_PATH)/% : \
 	export enable_ztp="$(ENABLE_ZTP)"
 	export enable_nat="$(ENABLE_NAT)"
 	export shutdown_bgp_on_start="$(SHUTDOWN_BGP_ON_START)"
+	export install_kubernetes="$(INSTALL_KUBERNETES)"
 	export enable_pfcwd_on_start="$(ENABLE_PFCWD_ON_START)"
 	export installer_debs="$(addprefix $(STRETCH_DEBS_PATH)/,$($*_INSTALLS))"
 	export lazy_installer_debs="$(foreach deb, $($*_LAZY_INSTALLS),$(foreach device, $($(deb)_PLATFORM),$(addprefix $(device)@, $(STRETCH_DEBS_PATH)/$(deb))))"