installers/install_kubeadm_cluster.sh

   1 #!/bin/bash
   2 #
   3 #   Licensed under the Apache License, Version 2.0 (the "License");
   4 #   you may not use this file except in compliance with the License.
   5 #   You may obtain a copy of the License at
   6 #
   7 #       http://www.apache.org/licenses/LICENSE-2.0
   8 #
   9 #   Unless required by applicable law or agreed to in writing, software
  10 #   distributed under the License is distributed on an "AS IS" BASIS,
  11 #   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12 #   See the License for the specific language governing permissions and
  13 #   limitations under the License.
  14 #
  15
  16 set +eux
  17
  18 #installs kubernetes packages
  19 function install_kube() {
  20     [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function
  21     K8S_VERSION=1.20.14-00
  22     # Kubernetes releases can be found here: https://kubernetes.io/releases/
  23     # To check other available versions, run the following command
  24     # curl -s https://packages.cloud.google.com/apt/dists/kubernetes-xenial/main/binary-amd64/Packages | grep Version | awk '{print $2}'
  25     sudo apt-get update && sudo apt-get install -y apt-transport-https
  26     sudo apt-get update && sudo apt-get install -y apt-transport-https
  27     curl -fsSL https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo apt-key add -
  28     sudo add-apt-repository "deb https://apt.kubernetes.io/ kubernetes-xenial main"
  29     sudo apt-get update
  30     echo "Installing Kubernetes Packages ..."
  31     sudo apt-get install -y kubelet=${K8S_VERSION} kubeadm=${K8S_VERSION} kubectl=${K8S_VERSION}
  32     sudo apt-mark hold kubelet kubeadm kubectl
  33     [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
  34 }
  35
  36 #initializes kubernetes control plane
  37 function init_kubeadm() {
  38     [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function
  39     sudo swapoff -a
  40     sudo sed -i.bak '/.*none.*swap/s/^\(.*\)$/#\1/g' /etc/fstab
  41     sudo kubeadm init --config $1
  42     sleep 5
  43     [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
  44 }
  45
  46 function kube_config_dir() {
  47     [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function
  48     K8S_MANIFEST_DIR="/etc/kubernetes/manifests"
  49     [ ! -d $K8S_MANIFEST_DIR ] && FATAL "Cannot Install Kubernetes"
  50     mkdir -p $HOME/.kube
  51     sudo cp /etc/kubernetes/admin.conf $HOME/.kube/config
  52     sudo chown $(id -u):$(id -g) $HOME/.kube/config
  53     [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
  54 }
  55
  56 #deploys flannel as daemonsets
  57 function deploy_cni_provider() {
  58     [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function
  59     CNI_DIR="$(mktemp -d -q --tmpdir "flannel.XXXXXX")"
  60     trap 'rm -rf "${CNI_DIR}"' EXIT
  61     wget -q https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml -P $CNI_DIR
  62     kubectl apply -f $CNI_DIR
  63     [ $? -ne 0 ] && FATAL "Cannot Install Flannel"
  64     [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
  65 }
  66
  67 #taints K8s master node
  68 function taint_master_node() {
  69     [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function
  70     K8S_MASTER=$(kubectl get nodes | awk '$3~/master/'| awk '{print $1}')
  71     kubectl taint node $K8S_MASTER node-role.kubernetes.io/master:NoSchedule-
  72     sleep 5
  73     [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
  74 }
  75
  76 #Install Helm v3
  77 #Helm releases can be found here: https://github.com/helm/helm/releases
  78 function install_helm() {
  79     [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function
  80     HELM_VERSION="v3.7.2"
  81     if ! [[ "$(helm version --short 2>/dev/null)" =~ ^v3.* ]]; then
  82         # Helm is not installed. Install helm
  83         echo "Helm3 is not installed, installing ..."
  84         curl https://get.helm.sh/helm-${HELM_VERSION}-linux-amd64.tar.gz --output helm-${HELM_VERSION}.tar.gz
  85         tar -zxvf helm-${HELM_VERSION}.tar.gz
  86         sudo mv linux-amd64/helm /usr/local/bin/helm
  87         rm -r linux-amd64
  88         rm helm-${HELM_VERSION}.tar.gz
  89     else
  90         echo "Helm3 is already installed. Skipping installation..."
  91     fi
  92     helm repo add stable https://charts.helm.sh/stable
  93     helm repo update
  94     [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
  95 }
  96
  97 function install_k8s_storageclass() {
  98     [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function
  99     OPENEBS_VERSION="1.12.0"
 100     echo "Installing OpenEBS"
 101     helm repo add openebs https://openebs.github.io/charts
 102     helm repo update
 103     helm install --create-namespace --namespace openebs openebs openebs/openebs --version ${OPENEBS_VERSION}
 104     helm ls -n openebs
 105     local storageclass_timeout=400
 106     local counter=0
 107     local storageclass_ready=""
 108     echo "Waiting for storageclass"
 109     while (( counter < storageclass_timeout ))
 110     do
 111         kubectl get storageclass openebs-hostpath &> /dev/null
 112
 113         if [ $? -eq 0 ] ; then
 114             echo "Storageclass available"
 115             storageclass_ready="y"
 116             break
 117         else
 118             counter=$((counter + 15))
 119             sleep 15
 120         fi
 121     done
 122     [ -n "$storageclass_ready" ] || FATAL "Storageclass not ready after $storageclass_timeout seconds. Cannot install openebs"
 123     kubectl patch storageclass openebs-hostpath -p '{"metadata": {"annotations":{"storageclass.kubernetes.io/is-default-class":"true"}}}'
 124     [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
 125 }
 126
 127 #installs metallb from helm
 128 function install_helm_metallb() {
 129     [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function
 130     echo "Installing MetalLB"
 131     METALLB_VERSION="0.11.0"
 132     METALLB_IP_RANGE="$DEFAULT_IP/32"
 133     echo "configInline:
 134   address-pools:
 135    - name: default
 136      protocol: layer2
 137      addresses:
 138      - $METALLB_IP_RANGE" | sudo tee -a ${OSM_DOCKER_WORK_DIR}/metallb-config.yaml
 139     helm repo add metallb https://metallb.github.io/metallb
 140     helm repo update
 141     helm install --create-namespace --namespace metallb-system metallb metallb/metallb --version ${METALLB_VERSION} -f ${OSM_DOCKER_WORK_DIR}/metallb-config.yaml
 142     [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
 143 }
 144
 145 #checks openebs and metallb readiness
 146 function check_for_readiness() {
 147     [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function
 148     # Default input values
 149     sampling_period=2       # seconds
 150     time_for_readiness=20   # seconds ready
 151     time_for_failure=200    # seconds broken
 152     OPENEBS_NAMESPACE=openebs
 153     METALLB_NAMESPACE=metallb-system
 154     # STACK_NAME=osm          # By default, "osm"
 155
 156     # Equivalent number of samples
 157     oks_threshold=$((time_for_readiness/${sampling_period}))     # No. ok samples to declare the system ready
 158     failures_threshold=$((time_for_failure/${sampling_period}))  # No. nok samples to declare the system broken
 159     failures_in_a_row=0
 160     oks_in_a_row=0
 161
 162     ####################################################################################
 163     # Loop to check system readiness
 164     ####################################################################################
 165     while [[ (${failures_in_a_row} -lt ${failures_threshold}) && (${oks_in_a_row} -lt ${oks_threshold}) ]]
 166     do
 167         # State of OpenEBS
 168         OPENEBS_STATE=$(kubectl get pod -n ${OPENEBS_NAMESPACE} --no-headers 2>&1)
 169         OPENEBS_READY=$(echo "${OPENEBS_STATE}" | awk '$2=="1/1" || $2=="2/2" {printf ("%s\t%s\t\n", $1, $2)}')
 170         OPENEBS_NOT_READY=$(echo "${OPENEBS_STATE}" | awk '$2!="1/1" && $2!="2/2" {printf ("%s\t%s\t\n", $1, $2)}')
 171         COUNT_OPENEBS_READY=$(echo "${OPENEBS_READY}"| grep -v -e '^$' | wc -l)
 172         COUNT_OPENEBS_NOT_READY=$(echo "${OPENEBS_NOT_READY}" | grep -v -e '^$' | wc -l)
 173
 174         # State of MetalLB
 175         METALLB_STATE=$(kubectl get pod -n ${METALLB_NAMESPACE} --no-headers 2>&1)
 176         METALLB_READY=$(echo "${METALLB_STATE}" | awk '$2=="1/1" || $2=="2/2" {printf ("%s\t%s\t\n", $1, $2)}')
 177         METALLB_NOT_READY=$(echo "${METALLB_STATE}" | awk '$2!="1/1" && $2!="2/2" {printf ("%s\t%s\t\n", $1, $2)}')
 178         COUNT_METALLB_READY=$(echo "${METALLB_READY}" | grep -v -e '^$' | wc -l)
 179         COUNT_METALLB_NOT_READY=$(echo "${METALLB_NOT_READY}" | grep -v -e '^$' | wc -l)
 180
 181         # OK sample
 182         if [[ $((${COUNT_OPENEBS_NOT_READY}+${COUNT_METALLB_NOT_READY})) -eq 0 ]]
 183         then
 184             ((++oks_in_a_row))
 185             failures_in_a_row=0
 186             echo -ne ===\> Successful checks: "${oks_in_a_row}"/${oks_threshold}\\r
 187         # NOK sample
 188         else
 189             ((++failures_in_a_row))
 190             oks_in_a_row=0
 191             echo
 192             echo Bootstraping... "${failures_in_a_row}" checks of ${failures_threshold}
 193
 194             # Reports failed pods in OpenEBS
 195             if [[ "${COUNT_OPENEBS_NOT_READY}" -ne 0 ]]
 196             then
 197                 echo "OpenEBS: Waiting for ${COUNT_OPENEBS_NOT_READY} of $((${COUNT_OPENEBS_NOT_READY}+${COUNT_OPENEBS_READY})) pods to be ready:"
 198                 echo "${OPENEBS_NOT_READY}"
 199                 echo
 200             fi
 201
 202             # Reports failed statefulsets
 203             if [[ "${COUNT_METALLB_NOT_READY}" -ne 0 ]]
 204             then
 205                 echo "MetalLB: Waiting for ${COUNT_METALLB_NOT_READY} of $((${COUNT_METALLB_NOT_READY}+${COUNT_METALLB_READY})) pods to be ready:"
 206                 echo "${METALLB_NOT_READY}"
 207                 echo
 208             fi
 209         fi
 210
 211         #------------ NEXT SAMPLE
 212         sleep ${sampling_period}
 213     done
 214
 215     ####################################################################################
 216     # OUTCOME
 217     ####################################################################################
 218     if [[ (${failures_in_a_row} -ge ${failures_threshold}) ]]
 219     then
 220         echo
 221         FATAL "K8S CLUSTER IS BROKEN"
 222     else
 223         echo
 224         echo "K8S CLUSTER IS READY"
 225     fi
 226     [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
 227 }
 228
 229 #removes osm deployments and services
 230 function remove_k8s_namespace() {
 231     [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function
 232     kubectl delete ns $1
 233     [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
 234 }
 235
 236 # main
 237 while getopts ":D:d:i:-: " o; do
 238     case "${o}" in
 239         i)
 240             DEFAULT_IP="${OPTARG}"
 241             ;;
 242         d)
 243             OSM_DOCKER_WORK_DIR="${OPTARG}"
 244             ;;
 245         D)
 246             OSM_DEVOPS="${OPTARG}"
 247             ;;
 248         -)
 249             [ "${OPTARG}" == "debug" ] && DEBUG_INSTALL="y" && continue
 250             echo -e "Invalid option: '--$OPTARG'\n" >&2
 251             exit 1
 252             ;;
 253         :)
 254             echo "Option -$OPTARG requires an argument" >&2
 255             exit 1
 256             ;;
 257         \?)
 258             echo -e "Invalid option: '-$OPTARG'\n" >&2
 259             exit 1
 260             ;;
 261         *)
 262             exit 1
 263             ;;
 264     esac
 265 done
 266
 267 source $OSM_DEVOPS/common/logging
 268 source $OSM_DEVOPS/common/track
 269
 270 echo "DEBUG_INSTALL=$DEBUG_INSTALL"
 271 echo "DEFAULT_IP=$DEFAULT_IP"
 272 echo "OSM_DEVOPS=$OSM_DEVOPS"
 273 echo "OSM_DOCKER_WORK_DIR=$OSM_DOCKER_WORK_DIR"
 274 echo "INSTALL_K8S_MONITOR=$INSTALL_K8S_MONITOR"
 275 echo "HOME=$HOME"
 276
 277
 278 install_kube
 279 track k8scluster install_k8s_ok
 280 init_kubeadm $OSM_DOCKER_WORK_DIR/cluster-config.yaml
 281 kube_config_dir
 282 track k8scluster init_k8s_ok
 283 if [ -n "$INSTALL_K8S_MONITOR" ]; then
 284     # uninstall OSM MONITORING
 285     uninstall_k8s_monitoring
 286     track k8scluster uninstall_k8s_monitoring_ok
 287 fi
 288 #remove old namespace
 289 remove_k8s_namespace osm
 290 deploy_cni_provider
 291 taint_master_node
 292 install_helm
 293 track k8scluster install_helm_ok
 294 install_k8s_storageclass
 295 track k8scluster k8s_storageclass_ok
 296 install_helm_metallb
 297 track k8scluster k8s_metallb_ok
 298 check_for_readiness
 299 track k8scluster k8s_ready_ok
 300