cluster update script: 0.6.0 to 0.6.1

Signed-off-by: Suraj Deshmukh <suraj@kinvolk.io>

scripts/update/0.6-0.6.1/cluster.sh

@@ -0,0 +1,49 @@
+#!/bin/bash
+
+set -euo pipefail
+
+mode="${1}"
+
+function run_on_host() {
+  nsenter -a -t 1 /bin/sh -c "${1}"
+}
+
+function update_etcd() {
+  if [ "${mode}" != "controller" ]; then
+    echo "Nothing to do. Not a controller node."
+    return
+  fi
+
+  rkt_etcd_cfg="/etc/systemd/system/etcd-member.service.d/40-etcd-cluster.conf"
+  docker_etcd_cfg="/etc/kubernetes/etcd.env"
+  docker_etcd_svc="/etc/systemd/system/etcd.service"
+
+  if [ -f "${rkt_etcd_cfg}" ]; then
+    echo "Nothing to do. Rkt based etcd node."
+    return
+  fi
+
+  if grep "^IMAGE_TAG" "${docker_etcd_cfg}" >/dev/null; then
+    echo "etcd env var file ${docker_etcd_cfg} is already updated."
+    return
+  fi
+
+  echo -e "\nUpdating etcd file...\nOld etcd config file:\n"
+  cat "${docker_etcd_cfg}"
+  sed 's|ETCD_IMAGE_TAG|IMAGE_TAG|g; s|ETCD_IMAGE_URL|IMAGE_URL|g; s|ETCD_SSL_DIR|SSL_DIR|g; s|ETCD_USER|USER|g' ${docker_etcd_cfg} >/tmp/etcd.env
+  cat /tmp/etcd.env >"${docker_etcd_cfg}"
+  echo -e "\nNew etcd config file:\n"
+  cat "${docker_etcd_cfg}"
+
+  echo -e "\nOld etcd service file:\n"
+  cat "${docker_etcd_svc}"
+  sed 's|ETCD_IMAGE_TAG|IMAGE_TAG|g; s|ETCD_IMAGE_URL|IMAGE_URL|g; s|ETCD_SSL_DIR|SSL_DIR|g; s|ETCD_USER|USER|g' ${docker_etcd_svc} >/tmp/etcd.service
+  cat /tmp/etcd.service >"${docker_etcd_svc}"
+  echo -e "\nNew etcd service file:\n"
+  cat "${docker_etcd_svc}"
+
+  echo -e "\nRestarting etcd...\n"
+  run_on_host "systemctl daemon-reload && systemctl is-active etcd && systemctl restart etcd && systemctl status --no-pager etcd"
+}
+
+update_etcd

scripts/update/0.6-0.6.1/update.sh

@@ -0,0 +1,81 @@
+#!/bin/bash
+
+set -euo pipefail
+
+readonly script_dir=$(cd "$(dirname "${BASH_SOURCE[0]}")" &>/dev/null && pwd -P)
+readonly namespace="update-host-files"
+
+kubectl create ns "${namespace}" --dry-run=client -o yaml | kubectl apply -f -
+kubectl label ns "${namespace}" "lokomotive.kinvolk.io/name=${namespace}"
+kubectl create -n "${namespace}" cm script --from-file "${script_dir}"/cluster.sh --dry-run=client -o yaml | kubectl apply -f -
+
+function update_node_files() {
+  nodename=$1
+  mode=$2
+
+  podname="uhf-$nodename-$RANDOM"
+
+  echo "
+apiVersion: v1
+kind: Pod
+metadata:
+  labels:
+    run: ${podname}
+  name: ${podname}
+  namespace: ${namespace}
+spec:
+  containers:
+  - image: registry.fedoraproject.org/fedora:32
+    name: update-host-files
+    imagePullPolicy: IfNotPresent
+    securityContext:
+      privileged: true
+    args:
+    - sh
+    - -c
+    - bash /tmp/script/cluster.sh ${mode}
+    volumeMounts:
+    - name: etc-kubernetes
+      mountPath: /etc/kubernetes/
+    - name: script
+      mountPath: /tmp/script/
+    - name: rkt-etcd
+      mountPath: /etc/systemd/system/etcd-member.service.d/
+    - name: etcd-service
+      mountPath: /etc/systemd/system/etcd.service
+  nodeName: ${nodename}
+  restartPolicy: Never
+  hostPID: true
+  serviceAccountName: default
+  volumes:
+  - name: etc-kubernetes
+    hostPath:
+      path: /etc/kubernetes/
+  - name: etcd-service
+    hostPath:
+      path: /etc/systemd/system/etcd.service
+  - name: script
+    configMap:
+      name: script
+  - name: rkt-etcd
+    hostPath:
+      path: /etc/systemd/system/etcd-member.service.d/
+" | kubectl apply -f -
+
+  echo -e "\n\nLogs: ${podname}\n\n"
+
+  # Wait until pod exits. Show logs to the user.
+  while ! kubectl -n "${namespace}" logs -f "${podname}" 2>/dev/null; do
+    sleep 1
+  done
+
+  echo '-------------------------------------------------------------------------------------------'
+}
+
+function update_controller_nodes() {
+  for nodename in $(kubectl get nodes -l node.kubernetes.io/master -ojsonpath='{.items[*].metadata.name}'); do
+    update_node_files "${nodename}" "controller"
+  done
+}
+
+update_controller_nodes