新增learn-kubernetes（https://github.com/yyong-brs/learn-kubernetes）相关文件

learn/learn-kubernetes-master/kiamol/ch18/setup/linux-setup.sh

@@ -0,0 +1,44 @@
+#!/bin/bash
+
+DOCKER_VERSION="5:19.03.12~3-0~ubuntu-focal"
+KUBERNETES_VERSION="1.18.5-00"
+hostname -I | awk '{print $NF}' > /tmp/ip.txt
+
+# turn off swap - for the Kubelet
+swapoff -a 
+sed -ri '/\sswap\s/s/^#?/#/' /etc/fstab
+
+# install Docker (https://docs.docker.com/install/linux/docker-ce/ubuntu/)
+apt-get update
+apt-get install -y \
+    apt-transport-https \
+    ca-certificates \
+    curl \
+    gnupg-agent \
+    software-properties-common
+
+curl -fsSL https://download.docker.com/linux/ubuntu/gpg | apt-key add -
+
+add-apt-repository \
+   "deb [arch=amd64] https://download.docker.com/linux/ubuntu \
+   $(lsb_release -cs) \
+   stable"
+
+apt-get update
+apt-get install -y \
+    docker-ce=$DOCKER_VERSION \
+    docker-ce-cli=$DOCKER_VERSION \
+    containerd.io
+
+# install Kubeadm etc.
+curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo apt-key add -
+echo 'deb https://apt.kubernetes.io/ kubernetes-xenial main' > /etc/apt/sources.list.d/kubernetes.list
+
+apt-get update
+apt-get install -y \
+    kubelet=$KUBERNETES_VERSION \
+    kubeadm=$KUBERNETES_VERSION \
+    kubectl=$KUBERNETES_VERSION
+
+# set iptables for Flannel
+sysctl net.bridge.bridge-nf-call-iptables=1