添加kubeadm介绍和Ubuntu环境下安装样例的章节
吴洪明
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# 用kubeadm在Ubuntu上快速构建Kubernetes基础集群
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本文将介绍如何在Ubuntu server 16.04版本上安装kubeadm，并利用kubeadm快速的在Ubuntu server 版本 16.04上构建一个kubernetes的基础的测试集群，用来做学习和测试用途，当前（2018-04-14）最新的版本是1.10.1。参考文档包括kubernetes官方网站的[kubeadm安装文档](https://kubernetes.io/docs/setup/independent/install-kubeadm/)以及[利用kubeadm创建集群](https://kubernetes.io/docs/setup/independent/create-cluster-kubeadm/)这两个文档。
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生产用途的环境，需要考虑各个组件的高可用，建议参考Kubernetes的官方的相关的安装文档。
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## 概述
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本次安装建议至少4台服务器或者虚拟机，每台服务器4G内存，2个CPU核心以上，基本架构为1台master节点，3台slave节点。整个安装过程将在Ubuntu服务器上安装完kubeadm，以及安装kubernetes的基本集群，包括canal网络，另后台存储可参考本书的最佳实践中的存储管理内容。
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本次安装一共4个节点，节点信息如下:
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| 角色 | 主机名 | IP地址 |
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|----------|----------- |------------|
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| Master | Ubuntu-master | 192.168.5.200 |
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| Slave | ubuntu-1 | 192.168.5.201 |
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| Slave | ubuntu-2 | 192.168.5.202 |
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| Slave | ubuntu-3 | 192.168.5.203 |
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## 准备工作
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* 默认方式安装Ubuntu Server 版本 16.04
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* 配置主机名映射，每个节点
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```console
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# cat /etc/hosts
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127.0.0.1 localhost
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192.168.0.200 Ubuntu-master
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192.168.0.201 Ubuntu-1
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192.168.0.202 Ubuntu-2
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192.168.0.203 Ubuntu-3
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```
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* 如果连接gcr网站不方便，无法下载镜像，会导致安装过程卡住，可以下载我导出的镜像包，[我导出的镜像](https://pan.baidu.com/s/1knjGYvxfSeiixWbK6Le8Jw)，解压缩以后是9个tar包，使用```docker load< xxxx.tar``` 导入即可）。
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## 在所有节点上安装kubeadm
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查看apt安装源如下配置，使用阿里云的系统和kubernetes的源。
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```console
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# cat /etc/apt/sources.list
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#系统安装源
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deb http://mirrors.aliyun.com/ubuntu/ xenial main restricted
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deb http://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted
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deb http://mirrors.aliyun.com/ubuntu/ xenial universe
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deb http://mirrors.aliyun.com/ubuntu/ xenial-updates universe
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deb http://mirrors.aliyun.com/ubuntu/ xenial multiverse
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deb http://mirrors.aliyun.com/ubuntu/ xenial-updates multiverse
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deb http://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse
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#kubeadm及kubernetes组件安装源
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deb https://mirrors.aliyun.com/kubernetes/apt kubernetes-xenial main
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```
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安装docker，可以使用系统源的的docker.io软件包，版本1.13.1，我的系统里是已经安装好最新的版本了。
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```console
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# apt-get install docker.io
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Reading package lists... Done
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Building dependency tree
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Reading state information... Done
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docker.io is already the newest version (1.13.1-0ubuntu1~16.04.2).
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0 upgraded, 0 newly installed, 0 to remove and 4 not upgraded.
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```
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更新源，可以不理会gpg的报错信息。
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```console
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# apt-get update
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Hit:1 http://mirrors.aliyun.com/ubuntu xenial InRelease
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Hit:2 http://mirrors.aliyun.com/ubuntu xenial-updates InRelease
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Hit:3 http://mirrors.aliyun.com/ubuntu xenial-backports InRelease
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Get:4 https://mirrors.aliyun.com/kubernetes/apt kubernetes-xenial InRelease [8,993 B]
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Ign:4 https://mirrors.aliyun.com/kubernetes/apt kubernetes-xenial InRelease
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Fetched 8,993 B in 0s (20.7 kB/s)
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Reading package lists... Done
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W: GPG error: https://mirrors.aliyun.com/kubernetes/apt kubernetes-xenial InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 6A030B21BA07F4FB
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W: The repository 'https://mirrors.aliyun.com/kubernetes/apt kubernetes-xenial InRelease' is not signed.
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N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
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N: See apt-secure(8) manpage for repository creation and user configuration details.
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```
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强制安装kubeadm，kubectl，kubelet软件包。
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```console
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# apt-get install -y kubelet kubeadm kubectl --allow-unauthenticated
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Reading package lists... Done
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Building dependency tree
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Reading state information... Done
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The following additional packages will be installed:
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kubernetes-cni socat
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The following NEW packages will be installed:
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kubeadm kubectl kubelet kubernetes-cni socat
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0 upgraded, 5 newly installed, 0 to remove and 4 not upgraded.
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Need to get 56.9 MB of archives.
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After this operation, 410 MB of additional disk space will be used.
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WARNING: The following packages cannot be authenticated!
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kubernetes-cni kubelet kubectl kubeadm
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Authentication warning overridden.
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Get:1 http://mirrors.aliyun.com/ubuntu xenial/universe amd64 socat amd64 1.7.3.1-1 [321 kB]
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Get:2 https://mirrors.aliyun.com/kubernetes/apt kubernetes-xenial/main amd64 kubernetes-cni amd64 0.6.0-00 [5,910 kB]
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Get:3 https://mirrors.aliyun.com/kubernetes/apt kubernetes-xenial/main amd64 kubelet amd64 1.10.1-00 [21.1 MB]
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Get:4 https://mirrors.aliyun.com/kubernetes/apt kubernetes-xenial/main amd64 kubectl amd64 1.10.1-00 [8,906 kB]
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Get:5 https://mirrors.aliyun.com/kubernetes/apt kubernetes-xenial/main amd64 kubeadm amd64 1.10.1-00 [20.7 MB]
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Fetched 56.9 MB in 5s (11.0 MB/s)
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Use of uninitialized value $_ in lc at /usr/share/perl5/Debconf/Template.pm line 287.
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Selecting previously unselected package kubernetes-cni.
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(Reading database ... 191799 files and directories currently installed.)
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Preparing to unpack .../kubernetes-cni_0.6.0-00_amd64.deb ...
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Unpacking kubernetes-cni (0.6.0-00) ...
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Selecting previously unselected package socat.
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Preparing to unpack .../socat_1.7.3.1-1_amd64.deb ...
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Unpacking ....
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....
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```
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kubeadm安装完以后，就可以使用它来快速安装部署Kubernetes集群了。
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## 使用kubeadm安装Kubernetes集群
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### 使用kubeadmin初始化master节点
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因为使用要使用canal，因此需要在初始化时加上网络配置参数,设置kubernetes的子网为10.244.0.0/16，注意此处不要修改为其他地址，因为这个值与后续的canal的yaml值要一致，如果修改，请一并修改。
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这个下载镜像的过程涉及翻墙，因为会从gcr的站点下载容器镜像。。。（如果大家翻墙不方便的话，可以用[我导出的镜像](https://pan.baidu.com/s/1knjGYvxfSeiixWbK6Le8Jw),解压缩以后是9个tar包，使用```docker load< xxxx.tar``` 导入即可）。
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如果有能够连接gcr站点的网络，那么整个安装过程非常简单。
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```console
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# kubeadm init --pod-network-cidr=10.244.0.0/16 --apiserver-advertise-address=192.168.0.200
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[init] Using Kubernetes version: v1.10.1
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[init] Using Authorization modes: [Node RBAC]
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[preflight] Running pre-flight checks.
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[WARNING FileExisting-crictl]: crictl not found in system path
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Suggestion: go get github.com/kubernetes-incubator/cri-tools/cmd/crictl
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[preflight] Starting the kubelet service
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[certificates] Generated ca certificate and key.
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[certificates] Generated apiserver certificate and key.
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[certificates] apiserver serving cert is signed for DNS names [ubuntu-master kubernetes kubernetes.default kubernetes.default.svc kubernetes.default.svc.cluster.local] and IPs [10.96.0.1 192.168.0.200]
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[certificates] Generated apiserver-kubelet-client certificate and key.
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[certificates] Generated etcd/ca certificate and key.
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[certificates] Generated etcd/server certificate and key.
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[certificates] etcd/server serving cert is signed for DNS names [localhost] and IPs [127.0.0.1]
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[certificates] Generated etcd/peer certificate and key.
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[certificates] etcd/peer serving cert is signed for DNS names [ubuntu-master] and IPs [192.168.0.200]
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[certificates] Generated etcd/healthcheck-client certificate and key.
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[certificates] Generated apiserver-etcd-client certificate and key.
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[certificates] Generated sa key and public key.
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[certificates] Generated front-proxy-ca certificate and key.
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[certificates] Generated front-proxy-client certificate and key.
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[certificates] Valid certificates and keys now exist in "/etc/kubernetes/pki"
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[kubeconfig] Wrote KubeConfig file to disk: "/etc/kubernetes/admin.conf"
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[kubeconfig] Wrote KubeConfig file to disk: "/etc/kubernetes/kubelet.conf"
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[kubeconfig] Wrote KubeConfig file to disk: "/etc/kubernetes/controller-manager.conf"
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[kubeconfig] Wrote KubeConfig file to disk: "/etc/kubernetes/scheduler.conf"
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[controlplane] Wrote Static Pod manifest for component kube-apiserver to "/etc/kubernetes/manifests/kube-apiserver.yaml"
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[controlplane] Wrote Static Pod manifest for component kube-controller-manager to "/etc/kubernetes/manifests/kube-controller-manager.yaml"
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[controlplane] Wrote Static Pod manifest for component kube-scheduler to "/etc/kubernetes/manifests/kube-scheduler.yaml"
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[etcd] Wrote Static Pod manifest for a local etcd instance to "/etc/kubernetes/manifests/etcd.yaml"
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[init] Waiting for the kubelet to boot up the control plane as Static Pods from directory "/etc/kubernetes/manifests".
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[init] This might take a minute or longer if the control plane images have to be pulled.
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[apiclient] All control plane components are healthy after 28.003828 seconds
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[uploadconfig] Storing the configuration used in ConfigMap "kubeadm-config" in the "kube-system" Namespace
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[markmaster] Will mark node ubuntu-master as master by adding a label and a taint
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[markmaster] Master ubuntu-master tainted and labelled with key/value: node-role.kubernetes.io/master=""
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[bootstraptoken] Using token: rw4enn.mvk547juq7qi2b5f
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[bootstraptoken] Configured RBAC rules to allow Node Bootstrap tokens to post CSRs in order for nodes to get long term certificate credentials
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[bootstraptoken] Configured RBAC rules to allow the csrapprover controller automatically approve CSRs from a Node Bootstrap Token
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[bootstraptoken] Configured RBAC rules to allow certificate rotation for all node client certificates in the cluster
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[bootstraptoken] Creating the "cluster-info" ConfigMap in the "kube-public" namespace
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[addons] Applied essential addon: kube-dns
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[addons] Applied essential addon: kube-proxy
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Your Kubernetes master has initialized successfully!
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To start using your cluster, you need to run the following as a regular user:
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mkdir -p $HOME/.kube
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sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
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sudo chown $(id -u):$(id -g) $HOME/.kube/config
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You should now deploy a pod network to the cluster.
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Run "kubectl apply -f [podnetwork].yaml" with one of the options listed at:
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https://kubernetes.io/docs/concepts/cluster-administration/addons/
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You can now join any number of machines by running the following on each node
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as root:
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kubeadm join 192.168.0.200:6443 --token rw4enn.mvk547juq7qi2b5f --discovery-token-ca-cert-hash sha256:ba260d5191213382a806a9a7d92c9e6bb09061847c7914b1ac584d0c69471579
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```
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执行如下命令来配置kubectl。
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```console
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mkdir -p $HOME/.kube
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sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
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sudo chown $(id -u):$(id -g) $HOME/.kube/config
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```
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这样master的节点就配置好了，并且可以使用kubectl来进行各种操作了，根据上面的提示接着往下做，将slave节点加入到集群
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### Slave节点加入集群
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在slave节点执行如下的命令,将slave节点加入集群，正常的返回信息如下：
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```console
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#kubeadm join 192.168.0.200:6443 --token rw4enn.mvk547juq7qi2b5f --discovery-token-ca-cert-hash sha256:ba260d5191213382a806a9a7d92c9e6bb09061847c7914b1ac584d0c69471579
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[preflight] Running pre-flight checks.
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[WARNING FileExisting-crictl]: crictl not found in system path
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Suggestion: go get github.com/kubernetes-incubator/cri-tools/cmd/crictl
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[discovery] Trying to connect to API Server "192.168.0.200:6443"
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[discovery] Created cluster-info discovery client, requesting info from "https://192.168.0.200:6443"
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[discovery] Requesting info from "https://192.168.0.200:6443" again to validate TLS against the pinned public key
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[discovery] Cluster info signature and contents are valid and TLS certificate validates against pinned roots, will use API Server "192.168.0.200:6443"
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[discovery] Successfully established connection with API Server "192.168.0.200:6443"
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This node has joined the cluster:
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* Certificate signing request was sent to master and a response
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was received.
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* The Kubelet was informed of the new secure connection details.
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Run 'kubectl get nodes' on the master to see this node join the cluster.
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```
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等待节点加入完毕。加入中状态
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```console
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# kubectl get node
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NAME STATUS ROLES AGE VERSION
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ubuntu-1 NotReady <none> 6m v1.10.1
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ubuntu-2 NotReady <none> 6m v1.10.1
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ubuntu-3 NotReady <none> 6m v1.10.1
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ubuntu-master NotReady master 10m v1.10.1
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```
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在master节点查看信息如下状态为节点加入完毕
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```console
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root@Ubuntu-master:~# kubectl get pod -n kube-system -o wide
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NAME READY STATUS RESTARTS AGE IP NODE
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etcd-ubuntu-master 1/1 Running 0 21m 192.168.0.200 ubuntu-master
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kube-apiserver-ubuntu-master 1/1 Running 0 21m 192.168.0.200 ubuntu-master
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kube-controller-manager-ubuntu-master 1/1 Running 0 22m 192.168.0.200 ubuntu-master
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kube-dns-86f4d74b45-wkfk2 0/3 Pending 0 22m <none> <none>
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kube-proxy-6ddb4 1/1 Running 0 22m 192.168.0.200 ubuntu-master
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kube-proxy-7ngb9 1/1 Running 0 17m 192.168.0.202 ubuntu-2
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kube-proxy-fkhhx 1/1 Running 0 18m 192.168.0.201 ubuntu-1
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kube-proxy-rh4lq 1/1 Running 0 18m 192.168.0.203 ubuntu-3
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kube-scheduler-ubuntu-master 1/1 Running 0 21m 192.168.0.200 ubuntu-master
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```
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kubedns组件需要在网络插件完成安装以后会自动安装完成
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## 安装网络插件canal
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从[canal官方文档参考](https://docs.projectcalico.org/v3.0/getting-started/kubernetes/installation/hosted/canal/)，如下网址下载2个文件并且安装，其中一个是配置canal的RBAC权限，一个是部署canal的DaemonSet。
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```console
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# kubectl apply -f https://docs.projectcalico.org/v3.0/getting-started/kubernetes/installation/hosted/canal/rbac.yaml
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clusterrole.rbac.authorization.k8s.io "calico" created
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clusterrole.rbac.authorization.k8s.io "flannel" created
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clusterrolebinding.rbac.authorization.k8s.io "canal-flannel" created
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clusterrolebinding.rbac.authorization.k8s.io "canal-calico" created
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```
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```console
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# kubectl apply -f https://docs.projectcalico.org/v3.0/getting-started/kubernetes/installation/hosted/canal/canal.yaml
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configmap "canal-config" created
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daemonset.extensions "canal" created
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customresourcedefinition.apiextensions.k8s.io "felixconfigurations.crd.projectcalico.org" created
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customresourcedefinition.apiextensions.k8s.io "bgpconfigurations.crd.projectcalico.org" created
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customresourcedefinition.apiextensions.k8s.io "ippools.crd.projectcalico.org" created
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customresourcedefinition.apiextensions.k8s.io "clusterinformations.crd.projectcalico.org" created
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customresourcedefinition.apiextensions.k8s.io "globalnetworkpolicies.crd.projectcalico.org" created
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customresourcedefinition.apiextensions.k8s.io "networkpolicies.crd.projectcalico.org" created
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serviceaccount "canal" created
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```
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查看canal的安装状态
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```console
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# kubectl get pod -n kube-system -o wide
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NAME READY STATUS RESTARTS AGE IP NODE
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canal-fc94k 3/3 Running 10 4m 192.168.0.201 ubuntu-1
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canal-rs2wp 3/3 Running 10 4m 192.168.0.200 ubuntu-master
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canal-tqd4l 3/3 Running 10 4m 192.168.0.202 ubuntu-2
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canal-vmpnr 3/3 Running 10 4m 192.168.0.203 ubuntu-3
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etcd-ubuntu-master 1/1 Running 0 28m 192.168.0.200 ubuntu-master
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kube-apiserver-ubuntu-master 1/1 Running 0 28m 192.168.0.200 ubuntu-master
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kube-controller-manager-ubuntu-master 1/1 Running 0 29m 192.168.0.200 ubuntu-master
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kube-dns-86f4d74b45-wkfk2 3/3 Running 0 28m 10.244.2.2 ubuntu-3
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kube-proxy-6ddb4 1/1 Running 0 28m 192.168.0.200 ubuntu-master
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kube-proxy-7ngb9 1/1 Running 0 24m 192.168.0.202 ubuntu-2
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kube-proxy-fkhhx 1/1 Running 0 24m 192.168.0.201 ubuntu-1
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kube-proxy-rh4lq 1/1 Running 0 24m 192.168.0.203 ubuntu-3
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kube-scheduler-ubuntu-master 1/1 Running 0 28m 192.168.0.200 ubuntu-master
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```
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可以看到canal和kube-dns都已经运行正常，一个基本功能正常的测试环境就部署完毕了。
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此时查看集群的节点状态，版本为最新的版本v1.10.1
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```console
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# kubectl get node
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NAME STATUS ROLES AGE VERSION
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ubuntu-1 Ready <none> 27m v1.10.1
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ubuntu-2 Ready <none> 27m v1.10.1
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ubuntu-3 Ready <none> 27m v1.10.1
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ubuntu-master Ready master 31m v1.10.1
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```
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让master也运行pod（默认master不运行pod）,这样在测试环境做是可以的，不建议在生产环境如此操作
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```console
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||||
#kubectl taint nodes --all node-role.kubernetes.io/master-
|
||||
node "ubuntu-master" untainted
|
||||
taint "node-role.kubernetes.io/master:" not found
|
||||
taint "node-role.kubernetes.io/master:" not found
|
||||
taint "node-role.kubernetes.io/master:" not found
|
||||
```
|
||||
后续如果想要集群其他功能启用，请参考后续文章。
|
||||
|
|
@ -0,0 +1,40 @@
|
|||
# kubeadm
|
||||
# 基本介绍
|
||||
**kubeadm** 是一个工具包，可帮助您以简单，合理安全和可扩展的方式引导最佳实践Kubernetes群集。它还支持为您管理[Bootstrap Tokens](/docs/admin/bootstrap-tokens/)并升级/降级群集。
|
||||
|
||||
kubeadm的目标是建立一个通过Kubernetes一致性测试[Kubernetes Conformance tests](http://blog.kubernetes.io/2017/10/software-conformance-certification)的最小可行集群 ，但不会安装其他功能插件。
|
||||
|
||||
它在设计上并未为您安装网络解决方案，需要用户自行安装第三方符合CNI的网络解决方案（如flanal，calico，canal等）。
|
||||
|
||||
kubeadm可以在多种设备上运行，可以是Linux笔记本电脑，虚拟机，物理/云服务器或Raspberry Pi。这使得kubeadm非常适合与不同种类的配置系统（例如Terraform，Ansible等）集成。
|
||||
|
||||
kubeadm是一种简单的方式让新用户开始尝试Kubernetes，也可能是第一次让现有用户轻松测试他们的应用程序并缝合到一起的方式，也可以作为其他生态系统中的构建块，或者具有更大范围的安装工具。
|
||||
|
||||
可以在支持安装deb或rpm软件包的操作系统上非常轻松地安装kubeadm。SIG集群生命周期[SIG Cluster Lifecycle](https://github.com/kubernetes/community/tree/master/sig-cluster-lifecycle) kubeadm的SIG相关维护者提供了预编译的这些软件包，也可以在其他操作系统上使用。
|
||||
|
||||
## kubeadm 成熟度
|
||||
|
||||
| 分类 | 成熟度 Level |
|
||||
|---------------------------|--------------- |
|
||||
| Command line UX | beta |
|
||||
| Implementation | beta |
|
||||
| Config file API | alpha |
|
||||
| Self-hosting | alpha |
|
||||
| kubeadm alpha subcommands | alpha |
|
||||
| CoreDNS | alpha |
|
||||
| DynamicKubeletConfig | alpha |
|
||||
|
||||
kubeadm的整体功能状态为 **Beta**，即将在2018 年推向 **General Availability（GA）**。一些子功能（如自托管或配置文件API）仍在积极开发中。随着这个工具的发展，创建集群的实现可能会稍微改变，但总体实现应该相当稳定。根据`kubeadm alpha`定义，任何命令 都在alpha级别上受支持。
|
||||
|
||||
|
||||
## 支持时间表
|
||||
|
||||
Kubernetes版本通常支持九个月，在此期间，如果发现严重的错误或安全问题，可能会从发布分支发布补丁程序版本。这里是最新的Kubernetes版本和支持时间表; 这也适用于 `kubeadm`.
|
||||
|
||||
| Kubernetes version | Release month | End-of-life-month |
|
||||
|--------------------|----------------|-------------------|
|
||||
| v1.6.x | March 2017 | December 2017 |
|
||||
| v1.7.x | June 2017 | March 2018 |
|
||||
| v1.8.x | September 2017 | June 2018 |
|
||||
| v1.9.x | December 2017 | September 2018 |
|
||||
| v1.10.x | March 2018 | December 2018 |
|
||||
Loading…
Reference in New Issue