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官方提供 Kubernetes 部署 3 种方式
- minikube
Minikube 是一个工具，可以在本地快速运行一个单点的 Kubernetes，尝试 Kubernetes 或日常开发的用户使用。不能用于生产环境。
官方文档：https://kubernetes.io/docs/setup/minikube/
- kubeadm
kubeadm 可帮助你快速部署一套 kubernetes 集群。kubeadm 设计目的为新用户开始尝试 kubernetes 提供一种简单的方法。目前是 Beta 版。
官方文档：https://kubernetes.io/docs/reference/setup-tools/kubeadm/kubeadm/
https://kubernetes.io/docs/setup/independent/install-kubeadm/
- 二进制包
从官方下载发行版的二进制包，手动部署每个组件，组成 Kubernetes 集群。目前企业生产环境中主要使用该方式。
下载地址：https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG-1.11.md#v1113
1. 安装要求
- 操作系统
- Ubuntu 16.04+
- Debian 9
- CentOS 7
- RHEL 7
- Fedora 25/26 (best-effort)
- 其他
- 内存 2GB +，2 核 CPU +
- 集群节点之间可以通信
-
每个节点唯一主机名，MAC 地址和 product_uuid
- 检查 MAC 地址：使用 ip link 或者 ifconfig -a
- 检查 product_uuid：cat /sys/class/dmi/id/product_uuid
- 禁止 swap 分区。这样才能使 kubelet 正常工作
2. 准备环境
关闭防火墙：# systemctl stop firewalld
# systemctl disable firewalld
关闭 selinux：# sed -i 's/enforcing/disabled/' /etc/selinux/config
# setenforce 0
关闭 swap：# swapoff -a # 临时
# vim /etc/fstab # 永久
添加主机名与 IP 对应关系：# cat /etc/hosts
192.168.0.11 k8s-master
192.168.0.12 k8s-node1
192.168.0.13 k8s-node2
同步时间：# yum install ntpdate -y
# ntpdate ntp.api.bz3. 安装 Docker
Docker 与 Kubernetes 关系图：
# yum install -y yum-utils device-mapper-persistent-data lvm2
# yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
# yum install docker-ce-17.03.3.ce -y #目前 kubeadm 最大支持 docker-ce-17.03，所以要指定该版本安装
# systemctl enable docker && systemctl start docker 如果提示 container-selinux 依赖问题，先安装 ce-17.03 匹配版本：# yum localinstall https://download.docker.com/linux/centos/7/x86_64/stable/Packages/docker-ce-selinux-17.03.3.ce-1.el7.noarch.rpm
4. 安装 kubeadm，kubelet 和 kubectl
- kubeadm：引导集群的命令
- kubelet：集群中运行任务的代理程序
- kubectl：命令行管理工具
4.1 添加阿里云 YUM 软件源
# cat << EOF > /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF4.2 安装 kubeadm，kubelet 和 kubectl
# yum install -y kubelet kubeadm kubectl --disableexcludes=kubernetes
# systemctl enable kubelet && systemctl start kubelet注意：使用 Docker 时，kubeadm 会自动检查 kubelet 的 cgroup 驱动程序，并 /var/lib/kubelet/kubeadm-flags.env 在运行时将其设置在文件中。如果使用的其他 CRI，则必须在 /etc/default/kubelet 中 cgroup-driver 值修改为 cgroupfs：
# cat /var/lib/kubelet/kubeadm-flags.env
KUBELET_KUBEADM_ARGS=--cgroup-driver=cgroupfs --cni-bin-dir=/opt/cni/bin --cni-conf-dir=/etc/cni/net.d --network-plugin=cni
# systemctl daemon-reload
# systemctl restart kubelet5. 使用 kubeadm 创建单个 Master 集群
5.1 默认下载镜像地址在国外无法访问，先从准备好所需镜像
保存到脚本之间运行：
K8S_VERSION=v1.11.2
ETCD_VERSION=3.2.18
DASHBOARD_VERSION=v1.8.3
FLANNEL_VERSION=v0.10.0-amd64
DNS_VERSION=1.1.3
PAUSE_VERSION=3.1
# 基本组件
docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/kube-apiserver-amd64:$K8S_VERSION
docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/kube-controller-manager-amd64:$K8S_VERSION
docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/kube-scheduler-amd64:$K8S_VERSION
docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/kube-proxy-amd64:$K8S_VERSION
docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/etcd-amd64:$ETCD_VERSION
docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/pause:$PAUSE_VERSION
docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/coredns:$DNS_VERSION
# 网络组件
docker pull quay.io/coreos/flannel:$FLANNEL_VERSION
# 修改 tag
docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/kube-apiserver-amd64:$K8S_VERSION k8s.gcr.io/kube-apiserver-amd64:$K8S_VERSION
docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/kube-controller-manager-amd64:$K8S_VERSION k8s.gcr.io/kube-controller-manager-amd64:$K8S_VERSION
docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/kube-scheduler-amd64:$K8S_VERSION k8s.gcr.io/kube-scheduler-amd64:$K8S_VERSION
docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/kube-proxy-amd64:$K8S_VERSION k8s.gcr.io/kube-proxy-amd64:$K8S_VERSION
docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/etcd-amd64:$ETCD_VERSION k8s.gcr.io/etcd-amd64:$ETCD_VERSION
docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/pause:$PAUSE_VERSION k8s.gcr.io/pause:$PAUSE_VERSION
docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/coredns:$DNS_VERSION k8s.gcr.io/coredns:$DNS_VERSION5.2 初始化 Master
# kubeadm init --kubernetes-version=1.11.2 --pod-network-cidr=10.244.0.0/16 --apiserver-advertise-address=192.168.0.11
...
Your Kubernetes master has initialized successfully!
To start using your cluster, you need to run (as a regular user):
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
You should now deploy a pod network to the cluster.
Run "kubectl apply -f [podnetwork].yaml" with one of the addon options listed at:
http://kubernetes.io/docs/admin/addons/
You can now join any number of machines by running the following on each node
as root:
kubeadm join --token <token> <master-ip>:<master-port> --discovery-token-ca-cert-hash sha256:<hash>mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config5.3 安装 Pod 网络 – 插件
# kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/v0.10.0/Documentation/kube-flannel.yml5.4 加入工作节点
在 Node 节点切换到 root 账号执行：
# kubeadm join 192.168.0.11:6443 --token 6hk68y.0rdz1wdjyh85ntkr --discovery-token-ca-cert-hash sha256:d1d3f59ae37fbd632707cbeb9b095d0d0b19af535078091993c4bc4d9d2a7782格式：kubeadm join –token <token> <master-ip>:<master-port> –discovery-token-ca-cert-hash sha256:<hash>
6. kubernetes dashboard
先将 yaml 文件下载下来，修改里面镜像地址和 Service NodePort 类型。
# wget https://raw.githubusercontent.com/kubernetes/dashboard/master/src/deploy/recommended/kubernetes-dashboard.yaml修改镜像地址：
# registry.cn-hangzhou.aliyuncs.com/google_containers/kubernetes-dashboard-amd64:v1.10.0修改 Service：
kind: Service
apiVersion: v1
metadata:
labels:
k8s-app: kubernetes-dashboard
name: kubernetes-dashboard
namespace: kube-system
spec:
type: NodePort
ports:
- port: 443
targetPort: 8443
nodePort: 30001
selector:
k8s-app: kubernetes-dashboard# kubectl apply -f kubernetes-dashboard.yaml创建一个管理员角色：
apiVersion: v1
kind: ServiceAccount
metadata:
name: dashboard-admin
namespace: kube-system
---
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
name: dashboard-admin
subjects:
- kind: ServiceAccount
name: dashboard-admin
namespace: kube-system
roleRef:
kind: ClusterRole
name: cluster-admin
apiGroup: rbac.authorization.k8s.io# kubectl apply -f k8s-admin.yaml使用上述创建账号的 token 登录 Kubernetes Dashboard：
# kubectl get secret -n kube-system
# kubectl describe secret dashboard-admin-token-bwdjj -n kube-system
...
token: eyJhbGciOiJSUzI1NiIsImtpZCI6IiJ9.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.0hQU5Di_P1OX1DcnW2AYzjDAED66EOrqhF5iupv39wvB8wE-aLRSQyp0twX2M8u1KMZ67n6LxbH17VwEQkMDRVXs7ZlUCyAAD6kHDz3k-f7PAzH5vcuyO4veQ9ooVjk3DKjrP4zXQChHllBB1wmD_oyLjoWxK3Z5MBTlVGzSixVwuQNpFPbuS6Z7iLGwUOgjI0cGZ9Tt6cXzcK81KfAEpDIP_CtFV_Jw4s98EgBex9mZh6vq1dcxr03qfuK--udd_8GWZctu_p_P15hZZLoKEm5GCbs6JGvKL2aao_DEHfLp3XYEnApojI91vU4qAqdkvMZ2qWQNGYv4KNi2yPOOJQ
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