k8s 环境搭建

Intro

关于组织主题，活动相关介绍

前期准备

硬件要求

master节点内存2核3G(最小2G)
node节点内存2核2G

其中可以

搭建过程

配置 etc/host

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172.19.0.21 debian-21
172.19.0.22 debian-22
172.19.0.23 debian-23

配置 ssh

apt install openssh-server vim /etc/ssh/sshd_config PermitRootLogin yes

开启 ipv4 的 forward机制

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vim /etc/sysctl.conf
net.ipv4.ip_forward=1
sysctl --system

关闭 swap

swapoff -a

安装 runtime （每个节点都需要安装）

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apt install \
    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://mirrors.tuna.tsinghua.edu.cn/docker-ce/linux/debian \
   $(lsb_release -cs) \
   stable"

apt update

apt install docker-ce docker-ce-cli containerd.io

配置 docker

修改docker配置

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vim /etc/docker/daemon.json
{
  "registry-mirrors": [
    "https://dockerhub.azk8s.cn",
    "https://reg-mirror.qiniu.com"
  ],
  "exec-opts": ["native.cgroupdriver=systemd"],
  "log-driver": "json-file",
  "log-opts": {
    "max-size": "100m"
  },
  "insecure-registries": ["0.0.0.0/0"],
  "storage-driver": "overlay2"
}

Kubernates 组件

Master 组件

Protocol	Direction	Port Range	Purpose	Used By
TCP	InBound	6443*	Kubernetes API server	All
TCP	InBound	2379-2380	etcd server client API	kube-apiserver, etcd
TCP	InBound	10250	Kubelet API	Self, Control plane
TCP	InBound	10251	kube-scheduler	Self
TCP	InBound	10252	kube-controller-manager	Self

Nodes 组件

Protocol	Direction	Port Range	Purpose	Used By
TCP	InBound	10250	Kubelet API	Self, Control plane
TCP	InBound	30000-32767	NodePort Services	All

安装 kebulet kubeadm kubectl （master、node节点都需要安装）

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apt-get update && apt-get install -y apt-transport-https
curl https://mirrors.aliyun.com/kubernetes/apt/doc/apt-key.gpg | apt-key add - 

cat <<EOF >/etc/apt/sources.list.d/kubernetes.list
deb https://mirrors.aliyun.com/kubernetes/apt/ kubernetes-xenial main
EOF
apt-get update
apt-get install -y kubelet kubeadm kubectl

在 master 节点

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kubeadm init --apiserver-advertise-address 172.19.0.21 --pod-network-cidr 10.10.0.0/16 --service-cidr 10.11.0.0/16  --kubernetes-version=v1.15.3 --dry-run

k8s中要注意一下几个网络:

机器的网络
pod的网络
集群的网络