准备工作
- 运行 deb/rpm 兼容操作系统的一台或多台机器，例如 Ubuntu 或 CentOS
- 每台机器 2GB 或更多内存
- master 上的 CPU 要求 2 核或以上
- 集群中所有机器（公用或内网都可以）的网络都是可连通的
安装 kubeadm
准备工作
操作系统为 Ubuntu 16.04+
禁用 Swap。为了让 kubelet 正常工作你必须禁用 swap。
安装 Docker
在你的每一台机器上安装 Docker。建议使用的版本号为 17.03。而 1.11， 1.12 和 1.13 是可以正常使用的。17.06+ 可以用，但是 Kubernetes 团队还没有测试和验证。
如果你已经安装了要求的 Docker 版本，你可以进入下一部分了。如果没有，请用下面的命令安装 Docker。
apt-get update
apt-get install -y docker.io
或者安装 Docker CE 17.03
apt-get update
apt-get install -y apt-transport-https ca-certificates curl software-properties-common
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | apt-key add -
add-apt-repository "deb https://download.docker.com/linux/$(. /etc/os-release; echo "$ID") $(lsb_release -cs) stable"
apt-get update && apt-get install -y docker-ce=$(apt-cache madison docker-ce | grep 17.03 | head -1 | awk '{print $3}')
这里是 Docker 官方的安装指南
安装 kubeadm, kubectl, kubelet
版本号：1.10.3-00
- kubeadm: 引导启动 k8s 集群的命令工具。
- kubelet: 在群集中的所有计算机上运行的组件, 并用来执行如启动 pods 和 containers 等操作。
- kubectl: 用于操作运行中的集群的命令行工具。
sudo apt-get update && sudo apt-get install -y apt-transport-https
curl -s http://packages.faasx.com/google/apt/doc/apt-key.gpg | sudo apt-key add -
sudo cat <<EOF >/etc/apt/sources.list.d/kubernetes.list
deb http://mirrors.ustc.edu.cn/kubernetes/apt/ kubernetes-xenial main
EOF
sudo apt-get update
sudo apt-get install -y kubelet kubeadm kubectl
apt-key 官方地址为：https://packages.cloud.google.com/apt/doc/apt-key.gpg。
apt安装包地址使用了中科大的镜像，官方地址为：http://apt.kubernetes.io/。
从该链接 https://raw.githubusercontent.com/EagleChen/kubernetes_init/master/kube_apt_key.gpg 下载 kube_apt_key.gpg 到当前工作目录下，并按如下指令添加
$ cat kube_apt_key.gpg | sudo apt-key add -
显示 OK 即表示成功
下载 k8s 镜像
docker pull anjia0532/kube-proxy-amd64:v1.10.3 \
&& docker pull anjia0532/kube-controller-manager-amd64:v1.10.3 \
&& docker pull anjia0532/kube-scheduler-amd64:v1.10.3 \
&& docker pull anjia0532/kube-apiserver-amd64:v1.10.3 \
&& docker pull anjia0532/k8s-dns-dnsmasq-nanny-amd64:1.14.8 \
&& docker pull anjia0532/k8s-dns-sidecar-amd64:1.14.8 \
&& docker pull anjia0532/k8s-dns-kube-dns-amd64:1.14.8 \
&& docker pull anjia0532/pause-amd64:3.1 \
&& docker pull quay.io/coreos/flannel:v0.10.0-amd64
修改 image tag
docker tag anjia0532/kube-proxy-amd64:v1.10.3 k8s.gcr.io/kube-proxy-amd64:v1.10.3 \
&& docker tag anjia0532/kube-controller-manager-amd64:v1.10.3 k8s.gcr.io/kube-controller-manager-amd64:v1.10.3 \
&& docker tag anjia0532/kube-scheduler-amd64:v1.10.3 k8s.gcr.io/kube-scheduler-amd64:v1.10.3 \
&& docker tag anjia0532/kube-apiserver-amd64:v1.10.3 k8s.gcr.io/kube-apiserver-amd64:v1.10.3 \
&& docker tag anjia0532/k8s-dns-dnsmasq-nanny-amd64:1.14.8 k8s.gcr.io/k8s-dns-dnsmasq-nanny-amd64:1.14.8 \
&& docker tag anjia0532/k8s-dns-sidecar-amd64:1.14.8 k8s.gcr.io/k8s-dns-sidecar-amd64:1.14.8 \
&& docker tag anjia0532/k8s-dns-kube-dns-amd64:1.14.8 k8s.gcr.io/k8s-dns-kube-dns-amd64:1.14.8 \
&& docker tag anjia0532/pause-amd64:3.1 k8s.gcr.io/pause-amd64:3.1
需要下载 crictl
- USER 与 IP 修改为自己的
$ wget https://github.com/kubernetes-incubator/cri-tools/releases/download/v1.0.0-beta.1/crictl-v1.0.0-beta.1-linux-amd64.tar.gz
$ tar xvf crictl-v1.0.0-beta.1-linux-amd64.tar.gz
$ sudo chown root:root crictl
$ sudo cp crictl /usr/bin
$ scp crictl USER@IP:/home/USER
$ sudo chown root:root crictl
$ sudo mv crictl /usr/bin/
上面的步骤需要在所有机器上安装
初始化 master 节点
$ sudo kubeadm init --apiserver-advertise-address=10.66.180.159 --pod-network-cidr=10.244.0.0/16 --feature-gates=CoreDNS=true --kubernetes-version=v1.10.3
输出
这里修改了 kubeadm join ip:port，初始化正常的话按照你自己的输出来使用就可以了
[init] Using Kubernetes version: v1.10.3
[init] Using Authorization modes: [Node RBAC]
[preflight] Running pre-flight checks.
[WARNING SystemVerification]: docker version is greater than the most recently validated version. Docker version: 18.03.1-ce. Max validated version: 17.03
[preflight] Starting the kubelet service
[certificates] Generated ca certificate and key.
[certificates] Generated apiserver certificate and key.
[certificates] apiserver serving cert is signed for DNS names [org2 kubernetes kubernetes.default kubernetes.default.svc kubernetes.default.svc.cluster.local] and IPs [10.96.0.1 10.66.180.159]
[certificates] Generated apiserver-kubelet-client certificate and key.
[certificates] Generated etcd/ca certificate and key.
[certificates] Generated etcd/server certificate and key.
[certificates] etcd/server serving cert is signed for DNS names [localhost] and IPs [127.0.0.1]
[certificates] Generated etcd/peer certificate and key.
[certificates] etcd/peer serving cert is signed for DNS names [org2] and IPs [10.66.180.159]
[certificates] Generated etcd/healthcheck-client certificate and key.
[certificates] Generated apiserver-etcd-client certificate and key.
[certificates] Generated sa key and public key.
[certificates] Generated front-proxy-ca certificate and key.
[certificates] Generated front-proxy-client certificate and key.
[certificates] Valid certificates and keys now exist in "/etc/kubernetes/pki"
[kubeconfig] Wrote KubeConfig file to disk: "/etc/kubernetes/admin.conf"
[kubeconfig] Wrote KubeConfig file to disk: "/etc/kubernetes/kubelet.conf"
[kubeconfig] Wrote KubeConfig file to disk: "/etc/kubernetes/controller-manager.conf"
[kubeconfig] Wrote KubeConfig file to disk: "/etc/kubernetes/scheduler.conf"
[controlplane] Wrote Static Pod manifest for component kube-apiserver to "/etc/kubernetes/manifests/kube-apiserver.yaml"
[controlplane] Wrote Static Pod manifest for component kube-controller-manager to "/etc/kubernetes/manifests/kube-controller-manager.yaml"
[controlplane] Wrote Static Pod manifest for component kube-scheduler to "/etc/kubernetes/manifests/kube-scheduler.yaml"
[etcd] Wrote Static Pod manifest for a local etcd instance to "/etc/kubernetes/manifests/etcd.yaml"
[init] Waiting for the kubelet to boot up the control plane as Static Pods from directory "/etc/kubernetes/manifests".
[init] This might take a minute or longer if the control plane images have to be pulled.
[apiclient] All control plane components are healthy after 20.001731 seconds
[uploadconfig] Storing the configuration used in ConfigMap "kubeadm-config" in the "kube-system" Namespace
[markmaster] Will mark node org2 as master by adding a label and a taint
[markmaster] Master org2 tainted and labelled with key/value: node-role.kubernetes.io/master=""
[bootstraptoken] Using token: yof8me.re7zttbijtwmdavm
[bootstraptoken] Configured RBAC rules to allow Node Bootstrap tokens to post CSRs in order for nodes to get long term certificate credentials
[bootstraptoken] Configured RBAC rules to allow the csrapprover controller automatically approve CSRs from a Node Bootstrap Token
[bootstraptoken] Configured RBAC rules to allow certificate rotation for all node client certificates in the cluster
[bootstraptoken] Creating the "cluster-info" ConfigMap in the "kube-public" namespace
[addons] Applied essential addon: CoreDNS
[addons] Applied essential addon: kube-proxy
Your Kubernetes master has initialized successfully!
To start using your cluster, you need to run the following 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 options listed at:
https://kubernetes.io/docs/concepts/cluster-administration/addons/
You can now join any number of machines by running the following on each node
as root:
kubeadm join ip:port --token yof8me.re7zttbijtwmdavm --discovery-token-ca-cert-hash sha256:507756057bf6982624fa07bbbbdab0855d555c809ec185aac10de95a00c77e2b
如果需要在非 root 用户使用 kubectl, 可以执行以下命令（也是 kubeadm init 输出的一部分）
$ mkdir -p $HOME/.kube
$ sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
$ sudo chown $(id -u):$(id -g) $HOME/.kube/config
如果是 root 用户的话，你可以运行以下命令
export KUBECONFIG=/etc/kubernetes/admin.conf
kubeadm init 输出的 token 用于 master 和加入节点间的身份认证，token 是机密的，需要保证它的安全，因为拥有此标记的人都可以随意向集群中添加节点。你也可以使用 kubeadm 命令列出，创建，删除 Token，有关详细信息, 请参阅官方引用文档。
注意：kubeadm 加节点，还会在找 /var/run/dockershim.sock 文件时会报错，得加参数--ignore-preflight-errors=cri
加入集群
token 需要换成自己初始化时生成的。
kubeadm join 10.66.180.159:6443 --token yof8me.re7zttbijtwmdavm --discovery-token-ca-cert-hash sha256:507756057bf6982624fa07bbbbdab0855d555c809ec185aac10de95a00c77e2b --ignore-preflight-errors=cri
常用命令
kubeadm 常用命令
- kubeadm init
- kubeadm join
- kubeadm upgrade
- kubeadm config
- kubeadm reset
- kubeadm token
- kubeadm version
- kubeadm alpha
kubectl 常用命令
kubectl get node --show-labelskubectl get nodes
