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 --retry-on-host-error --retry-on-http-error 404,429,503 --tries=5 https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml -P $CNI_DIR
  62     [ ! -f $CNI_DIR/kube-flannel.yml  && FATAL "Cannot Install Flannel because $CNI_DIR/kube-flannel.yml was not found. Maybe the file https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml is temporarily not accessible"
  63     kubectl apply -f $CNI_DIR
  64     [ $? -ne 0 ] && FATAL "Cannot Install Flannel"
  65     [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
  66 }
  67
  68 #taints K8s master node
  69 function taint_master_node() {
  70     [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function
  71     K8S_MASTER=$(kubectl get nodes | awk '$3~/master/'| awk '{print $1}')
  72     kubectl taint node $K8S_MASTER node-role.kubernetes.io/master:NoSchedule-
  73     sleep 5
  74     [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
  75 }
  76
  77 #Install Helm v3
  78 #Helm releases can be found here: https://github.com/helm/helm/releases
  79 function install_helm() {
  80     [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function
  81     HELM_VERSION="v3.7.2"
  82     if ! [[ "$(helm version --short 2>/dev/null)" =~ ^v3.* ]]; then
  83         # Helm is not installed. Install helm
  84         echo "Helm3 is not installed, installing ..."
  85         curl https://get.helm.sh/helm-${HELM_VERSION}-linux-amd64.tar.gz --output helm-${HELM_VERSION}.tar.gz
  86         tar -zxvf helm-${HELM_VERSION}.tar.gz
  87         sudo mv linux-amd64/helm /usr/local/bin/helm
  88         rm -r linux-amd64
  89         rm helm-${HELM_VERSION}.tar.gz
  90     else
  91         echo "Helm3 is already installed. Skipping installation..."
  92     fi
  93     helm repo add stable https://charts.helm.sh/stable
  94     helm repo update
  95     [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
  96 }
  97
  98 function install_k8s_storageclass() {
  99     [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function
 100     OPENEBS_VERSION="1.12.0"
 101     echo "Installing OpenEBS"
 102     helm repo add openebs https://openebs.github.io/charts
 103     helm repo update
 104     helm install --create-namespace --namespace openebs openebs openebs/openebs --version ${OPENEBS_VERSION}
 105     helm ls -n openebs
 106     local storageclass_timeout=400
 107     local counter=0
 108     local storageclass_ready=""
 109     echo "Waiting for storageclass"
 110     while (( counter < storageclass_timeout ))
 111     do
 112         kubectl get storageclass openebs-hostpath &> /dev/null
 113
 114         if [ $? -eq 0 ] ; then
 115             echo "Storageclass available"
 116             storageclass_ready="y"
 117             break
 118         else
 119             counter=$((counter + 15))
 120             sleep 15
 121         fi
 122     done
 123     [ -n "$storageclass_ready" ] || FATAL "Storageclass not ready after $storageclass_timeout seconds. Cannot install openebs"
 124     kubectl patch storageclass openebs-hostpath -p '{"metadata": {"annotations":{"storageclass.kubernetes.io/is-default-class":"true"}}}'
 125     [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
 126 }
 127
 128 #installs metallb from helm
 129 function install_helm_metallb() {
 130     [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function
 131     echo "Installing MetalLB"
 132     METALLB_VERSION="0.11.0"
 133     METALLB_IP_RANGE="$DEFAULT_IP/32"
 134     echo "configInline:
 135   address-pools:
 136    - name: default
 137      protocol: layer2
 138      addresses:
 139      - $METALLB_IP_RANGE" | sudo tee -a ${OSM_DOCKER_WORK_DIR}/metallb-config.yaml
 140     helm repo add metallb https://metallb.github.io/metallb
 141     helm repo update
 142     helm install --create-namespace --namespace metallb-system metallb metallb/metallb --version ${METALLB_VERSION} -f ${OSM_DOCKER_WORK_DIR}/metallb-config.yaml
 143     [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
 144 }
 145
 146 #checks openebs and metallb readiness
 147 function check_for_readiness() {
 148     [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function
 149     # Default input values
 150     sampling_period=2       # seconds
 151     time_for_readiness=20   # seconds ready
 152     time_for_failure=200    # seconds broken
 153     OPENEBS_NAMESPACE=openebs
 154     METALLB_NAMESPACE=metallb-system
 155     # STACK_NAME=osm          # By default, "osm"
 156
 157     # Equivalent number of samples
 158     oks_threshold=$((time_for_readiness/${sampling_period}))     # No. ok samples to declare the system ready
 159     failures_threshold=$((time_for_failure/${sampling_period}))  # No. nok samples to declare the system broken
 160     failures_in_a_row=0
 161     oks_in_a_row=0
 162
 163     ####################################################################################
 164     # Loop to check system readiness
 165     ####################################################################################
 166     while [[ (${failures_in_a_row} -lt ${failures_threshold}) && (${oks_in_a_row} -lt ${oks_threshold}) ]]
 167     do
 168         # State of OpenEBS
 169         OPENEBS_STATE=$(kubectl get pod -n ${OPENEBS_NAMESPACE} --no-headers 2>&1)
 170         OPENEBS_READY=$(echo "${OPENEBS_STATE}" | awk '$2=="1/1" || $2=="2/2" {printf ("%s\t%s\t\n", $1, $2)}')
 171         OPENEBS_NOT_READY=$(echo "${OPENEBS_STATE}" | awk '$2!="1/1" && $2!="2/2" {printf ("%s\t%s\t\n", $1, $2)}')
 172         COUNT_OPENEBS_READY=$(echo "${OPENEBS_READY}"| grep -v -e '^$' | wc -l)
 173         COUNT_OPENEBS_NOT_READY=$(echo "${OPENEBS_NOT_READY}" | grep -v -e '^$' | wc -l)
 174
 175         # State of MetalLB
 176         METALLB_STATE=$(kubectl get pod -n ${METALLB_NAMESPACE} --no-headers 2>&1)
 177         METALLB_READY=$(echo "${METALLB_STATE}" | awk '$2=="1/1" || $2=="2/2" {printf ("%s\t%s\t\n", $1, $2)}')
 178         METALLB_NOT_READY=$(echo "${METALLB_STATE}" | awk '$2!="1/1" && $2!="2/2" {printf ("%s\t%s\t\n", $1, $2)}')
 179         COUNT_METALLB_READY=$(echo "${METALLB_READY}" | grep -v -e '^$' | wc -l)
 180         COUNT_METALLB_NOT_READY=$(echo "${METALLB_NOT_READY}" | grep -v -e '^$' | wc -l)
 181
 182         # OK sample
 183         if [[ $((${COUNT_OPENEBS_NOT_READY}+${COUNT_METALLB_NOT_READY})) -eq 0 ]]
 184         then
 185             ((++oks_in_a_row))
 186             failures_in_a_row=0
 187             echo -ne ===\> Successful checks: "${oks_in_a_row}"/${oks_threshold}\\r
 188         # NOK sample
 189         else
 190             ((++failures_in_a_row))
 191             oks_in_a_row=0
 192             echo
 193             echo Bootstraping... "${failures_in_a_row}" checks of ${failures_threshold}
 194
 195             # Reports failed pods in OpenEBS
 196             if [[ "${COUNT_OPENEBS_NOT_READY}" -ne 0 ]]
 197             then
 198                 echo "OpenEBS: Waiting for ${COUNT_OPENEBS_NOT_READY} of $((${COUNT_OPENEBS_NOT_READY}+${COUNT_OPENEBS_READY})) pods to be ready:"
 199                 echo "${OPENEBS_NOT_READY}"
 200                 echo
 201             fi
 202
 203             # Reports failed statefulsets
 204             if [[ "${COUNT_METALLB_NOT_READY}" -ne 0 ]]
 205             then
 206                 echo "MetalLB: Waiting for ${COUNT_METALLB_NOT_READY} of $((${COUNT_METALLB_NOT_READY}+${COUNT_METALLB_READY})) pods to be ready:"
 207                 echo "${METALLB_NOT_READY}"
 208                 echo
 209             fi
 210         fi
 211
 212         #------------ NEXT SAMPLE
 213         sleep ${sampling_period}
 214     done
 215
 216     ####################################################################################
 217     # OUTCOME
 218     ####################################################################################
 219     if [[ (${failures_in_a_row} -ge ${failures_threshold}) ]]
 220     then
 221         echo
 222         FATAL "K8S CLUSTER IS BROKEN"
 223     else
 224         echo
 225         echo "K8S CLUSTER IS READY"
 226     fi
 227     [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
 228 }
 229
 230 #removes osm deployments and services
 231 function remove_k8s_namespace() {
 232     [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function
 233     kubectl delete ns $1 2>&1 >/dev/null
 234     [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
 235 }
 236
 237 # main
 238 while getopts ":D:d:i:-: " o; do
 239     case "${o}" in
 240         i)
 241             DEFAULT_IP="${OPTARG}"
 242             ;;
 243         d)
 244             OSM_DOCKER_WORK_DIR="${OPTARG}"
 245             ;;
 246         D)
 247             OSM_DEVOPS="${OPTARG}"
 248             ;;
 249         -)
 250             [ "${OPTARG}" == "debug" ] && DEBUG_INSTALL="y" && continue
 251             echo -e "Invalid option: '--$OPTARG'\n" >&2
 252             exit 1
 253             ;;
 254         :)
 255             echo "Option -$OPTARG requires an argument" >&2
 256             exit 1
 257             ;;
 258         \?)
 259             echo -e "Invalid option: '-$OPTARG'\n" >&2
 260             exit 1
 261             ;;
 262         *)
 263             exit 1
 264             ;;
 265     esac
 266 done
 267
 268 source $OSM_DEVOPS/common/logging
 269 source $OSM_DEVOPS/common/track
 270
 271 echo "DEBUG_INSTALL=$DEBUG_INSTALL"
 272 echo "DEFAULT_IP=$DEFAULT_IP"
 273 echo "OSM_DEVOPS=$OSM_DEVOPS"
 274 echo "OSM_DOCKER_WORK_DIR=$OSM_DOCKER_WORK_DIR"
 275 echo "INSTALL_K8S_MONITOR=$INSTALL_K8S_MONITOR"
 276 echo "HOME=$HOME"
 277
 278
 279 install_kube
 280 track k8scluster install_k8s_ok
 281 init_kubeadm $OSM_DOCKER_WORK_DIR/cluster-config.yaml
 282 kube_config_dir
 283 track k8scluster init_k8s_ok
 284 if [ -n "$INSTALL_K8S_MONITOR" ]; then
 285     # uninstall OSM MONITORING
 286     uninstall_k8s_monitoring
 287     track k8scluster uninstall_k8s_monitoring_ok
 288 fi
 289 #remove old namespace
 290 remove_k8s_namespace osm
 291 deploy_cni_provider
 292 taint_master_node
 293 install_helm
 294 track k8scluster install_helm_ok
 295 install_k8s_storageclass
 296 track k8scluster k8s_storageclass_ok
 297 install_helm_metallb
 298 track k8scluster k8s_metallb_ok
 299 check_for_readiness
 300 track k8scluster k8s_ready_ok
 301