Add kubeadm-dind-cluster gate script as backlog

Change-Id: Ie749acc5c6e7f987085cb03702f6f48ab905a601

tools/gate/kubeadm-dind-cluster/README.md

@@ -0,0 +1,5 @@
+# kubeadm-dind-cluster script for Qinling gate
+
+This script is just for backlog purpose, it is not used for current devstack
+gate job. The known problem is Qinling service can not talk to the service
+created in k8s.

tools/gate/kubeadm-dind-cluster/setup_gate.sh

@@ -0,0 +1,81 @@
+#!/bin/bash
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+set -ex
+
+function net_default_iface {
+ sudo ip -4 route list 0/0 | awk '{ print $5; exit }'
+}
+
+function net_default_host_addr {
+ sudo ip addr | awk "/inet / && /$(net_default_iface)/{print \$2; exit }"
+}
+
+function net_default_host_ip {
+ echo $(net_default_host_addr) | awk -F '/' '{ print $1; exit }'
+}
+
+function net_hosts_pre_kube {
+  sudo cp -f /etc/hosts /etc/hosts-pre-kube
+  sudo sed -i "/$(hostname)/d" /etc/hosts
+  sudo sed -i "/127.0.0.1/d" /etc/hosts
+  sudo sed -i "1 i 127.0.0.1 localhost" /etc/hosts
+
+  host_ip=$(net_default_host_ip)
+  echo "${host_ip} $(hostname)" | sudo tee -a /etc/hosts
+}
+
+function create_k8s_screen {
+  # Starts a proxy to the Kubernetes API server in a screen session
+  sudo screen -S kube_proxy -X quit || true
+  sudo screen -dmS kube_proxy && sudo screen -S kube_proxy -X screen -t kube_proxy
+  sudo screen -S kube_proxy -p kube_proxy -X stuff 'kubectl proxy --accept-hosts=".*" --address="0.0.0.0"\n'
+}
+
+function tweak_etcd {
+  ETCD_VER=v3.2.0
+  TMP_DIR=/tmp/etcd
+  sudo rm -rf $TMP_DIR && mkdir -p $TMP_DIR
+  curl -L https://github.com/coreos/etcd/releases/download/${ETCD_VER}/etcd-${ETCD_VER}-linux-amd64.tar.gz \
+    -o /tmp/etcd-${ETCD_VER}-linux-amd64.tar.gz
+  tar xzvf /tmp/etcd-${ETCD_VER}-linux-amd64.tar.gz -C $TMP_DIR --strip-components=1
+
+  # Stop etcd service installed by apt
+  sudo systemctl stop etcd
+  cp $TMP_DIR/etcd /usr/bin/etcd
+  cp $TMP_DIR/etcdctl /usr/bin/etcdctl
+  sudo systemctl start etcd
+}
+
+
+sudo apt-get update -y
+sudo apt-get install -y --no-install-recommends -qq \
+        docker.io \
+        jq \
+        screen \
+        etcd
+
+net_hosts_pre_kube
+
+curl -sSO https://cdn.rawgit.com/Mirantis/kubeadm-dind-cluster/master/fixed/dind-cluster-v1.8.sh
+sudo chmod +x dind-cluster-v1.8.sh
+sudo ./dind-cluster-v1.8.sh clean || true
+sudo ./dind-cluster-v1.8.sh up
+echo 'export PATH="$HOME/.kubeadm-dind-cluster:$PATH"' >> $HOME/.bashrc
+
+# Treak etcd service, the default etcd version installed by apt is v2, we need
+# v3 instead.
+tweak_etcd
+
+# Starts a proxy to the Kubernetes API server in a screen session
+create_k8s_screen