大佬教程收集整理的这篇文章主要介绍了CentOS上部署Kubernetes集群，大佬教程大佬觉得挺不错的，现在分享给大家，也给大家做个参考。
1.安装net-tools
[[email protected] ~]# yum install -y net-tools
2.关闭firewalld
[[email protected] ~]# systemctl stop firewalld && systemctl disable firewalld Removed symlink /etc/systemd/system/multi-user.target.wants/firewalld.service. Removed symlink /etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service. [[email protected] ~]# setenforce 0 [[email protected] ~]# sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/config
如今Docker分为了Docker-CE和Docker-EE两个版本，CE为社区版即免费版，EE为企业版即商业版。我们选择使用CE版。
1.安装yum源工具包
[[email protected] ~]# yum install -y yum-utils device-mapper-persistent-data lvm2
2.下载docker-ce官方的yum源配置文件
[[email protected] ~]# yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
3.禁用docker-c-edge源配edge是不开发版，不稳定，下载stable版
yum-config-manager --disable docker-ce-edge
4.更新本地YUM源缓存
yum makecache fast
5.安装Docker-ce相应版本的
yum -y install docker-ce
6.运行Hello world
[[email protected] ~]# systemctl start docker [[email protected] ~]# docker run Hello-world Unable to find image 'Hello-world:latest' locally latest: Pulling from library/Hello-world 9a0669468bf7: Pull complete Digest: sha256:0e06ef5e1945a718b02a8c319e15bae44f47039005530bc617a5d071190ed3fc Status: Downloaded newer image for Hello-world:latest Hello from Docker! This message shows that your installation appears to be working correctly. To generate this message,Docker took the following steps: 1. The Docker client contacted the Docker daemon. 2. The Docker daemon pulled the "Hello-world" image from the Docker Hub. 3. The Docker daemon created a new container from that image which runs the executable that produces the output you are currently reading. 4. The Docker daemon streamed that output to the Docker client,which sent it to your terminal. To try something more ambitIoUs,you can run an Ubuntu container with: $ docker run -it ubuntu bash Share images,automate workflows,and more with a free Docker ID: https://cloud.docker.com/ For more examples and ideas,visit: https://docs.docker.com/ENGIne/userguide/
使用kubeadm init命令初始化集群之下载Docker镜像到所有主机的实始化时会下载kubeadm必要的依赖镜像，同时安装etcd,kube-dns,kube-proxy,由于我们GFW防火墙问题我们不能直接访问，因此先通过其它方法下载下面列表中的镜像，然后导入到系统中，再使用kubeadm init来初始化集群
1.使用DaoCloud加速器(可以跳过这一步)
[[email protected] ~]# curl -sSL https://get.daocloud.io/daotools/set_mirror.sh | sh -s http://0d236e3f.m.daocloud.io docker version >= 1.12 {"registry-mirrors": ["http://0d236e3f.m.daocloud.io"]} success. You need to restart docker to take effect: sudo systemctl restart docker [[email protected] ~]# systemctl restart docker
2.下载镜像,自己通过Dockerfile到dockerhub生成对镜像,也可以克隆我的
images=(kube-controller-manager-amd64 etcd-amd64 k8s-dns-sidecar-amd64 kube-proxy-amd64 kube-apiserver-amd64 kube-scheduler-amd64 pause-amd64 k8s-dns-dnsmasq-nAnny-amd64 k8s-dns-kube-dns-amd64) for imagename in ${images[@]} ; do docker pull champly/$imagename docker tag champly/$imagename gcr.io/google_containers/$imagename docker rmi champly/$imagename done
3.修改版本
docker tag gcr.io/google_containers/etcd-amd64 gcr.io/google_containers/etcd-amd64:3.0.17 && docker rmi gcr.io/google_containers/etcd-amd64 && docker tag gcr.io/google_containers/k8s-dns-dnsmasq-nAnny-amd64 gcr.io/google_containers/k8s-dns-dnsmasq-nAnny-amd64:1.14.5 && docker rmi gcr.io/google_containers/k8s-dns-dnsmasq-nAnny-amd64 && docker tag gcr.io/google_containers/k8s-dns-kube-dns-amd64 gcr.io/google_containers/k8s-dns-kube-dns-amd64:1.14.5 && docker rmi gcr.io/google_containers/k8s-dns-kube-dns-amd64 && docker tag gcr.io/google_containers/k8s-dns-sidecar-amd64 gcr.io/google_containers/k8s-dns-sidecar-amd64:1.14.2 && docker rmi gcr.io/google_containers/k8s-dns-sidecar-amd64 && docker tag gcr.io/google_containers/kube-apiserver-amd64 gcr.io/google_containers/kube-apiserver-amd64:v1.7.5 && docker rmi gcr.io/google_containers/kube-apiserver-amd64 && docker tag gcr.io/google_containers/kube-controller-manager-amd64 gcr.io/google_containers/kube-controller-manager-amd64:v1.7.5 && docker rmi gcr.io/google_containers/kube-controller-manager-amd64 && docker tag gcr.io/google_containers/kube-proxy-amd64 gcr.io/google_containers/kube-proxy-amd64:v1.6.0 && docker rmi gcr.io/google_containers/kube-proxy-amd64 && docker tag gcr.io/google_containers/kube-scheduler-amd64 gcr.io/google_containers/kube-scheduler-amd64:v1.7.5 && docker rmi gcr.io/google_containers/kube-scheduler-amd64 && docker tag gcr.io/google_containers/pause-amd64 gcr.io/google_containers/pause-amd64:3.0 && docker rmi gcr.io/google_containers/pause-amd64
4.添加阿里源
[[email protected] ~]# cat >> /etc/yum.repos.d/kubernetes.repo << EOF [kubernetes] name=Kubernetes baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/ enabled=1 gpgcheck=0 EOF
5.查看kubectl kubelet kubeadm kubernetes-cni列表
[[email protected] ~]# yum list kubectl kubelet kubeadm kubernetes-cni 已加载插件：fastestmirror Loading mirror speeds from cached hostfile * base: mirrors.tuna.tsinghua.edu.cn * extras: mirrors.sohu.com * updates: mirrors.sohu.com 可安装的软件包 kubeadm.x86_64 1.7.5-0 kubernetes kubectl.x86_64 1.7.5-0 kubernetes kubelet.x86_64 1.7.5-0 kubernetes kubernetes-cni.x86_64 0.5.1-0 kubernetes [[email protected] ~]#
6.安装kubectl kubelet kubeadm kubernetes-cni
[[email protected] ~]# yum install -y kubectl kubelet kubeadm kubernetes-cni
vi /etc/systemd/system/kubelet.service.d/10-kubeadm.conf
update KUBELET_CGROUP_ARGS=--cgroup-driver=systemd to KUBELET_CGROUP_ARGS=--cgroup-driver=cgroupfs
修改kubelet中的cAdvisor监控的端口，默认为0改为4194，这样就可以通过浏器查看kubelet的监控cAdvisor的web页
[[email protected] ~]# vi /etc/systemd/system/kubelet.service.d/10-kubeadm.conf
启动所有主机上的kubelet服务
[[email protected] ~]# systemctl enable kubelet && systemctl start kubelet
初始化master master节点上操作
[[email protected] ~]# kubeadm reset && kubeadm init --apiserver-advertise-address=192.168.0.100 --kubernetes-version=v1.7.5 --pod-network-cidr=10.200.0.0/16 [preflight] Running pre-flight checks [reset] Stopping the kubelet service [reset] UnmounTing mounted directories in "/var/lib/kubelet" [reset] Removing kubernetes-managed containers [reset] deleting contents of stateful directories: [/var/lib/kubelet /etc/cni/net.d /var/lib/dockershim /var/lib/etcd] [reset] deleting contents of config directories: [/etc/kubernetes/manifests /etc/kubernetes/pki] [reset] deleting files: [/etc/kubernetes/admin.conf /etc/kubernetes/kubelet.conf /etc/kubernetes/controller-manager.conf /etc/kubernetes/scheduler.conf] [kubeadm] WARNING: kubeadm is in beta,please do not use it for production clusters. [init] Using Kubernetes version: v1.7.5 [init] Using Authorization modes: [Node R@R_801_11442@] [preflight] Running pre-flight checks [preflight] WARNING: docker version is greater than the most recently validated version. Docker version: 17.09.0-ce. Max validated version: 1.12 [preflight] StarTing the kubelet service [kubeadm] WARNING: starTing in 1.8,tokens expire after 24 hours by default (if you require a non-expiring token use --token-ttl 0) [certificates] Generated CA certificate and key. [certificates] Generated API server certificate and key. [certificates] API Server serving cert is signed for DNS names [master kubernetes kubernetes.default kubernetes.default.svc kubernetes.default.svc.cluster.local] and IPs [10.96.0.1 192.168.0.100] [certificates] Generated API server kubelet client certificate and key. [certificates] Generated service account token signing 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" [apiclient] Created API client,waiTing for the control plane to become ready [apiclient] All control plane components are healthy after 34.002949 seconds [token] Using token: 0696ed.7cd261f787453bd9 [apiconfig] Created R@R_801_11442@ rules [addons] Applied essential addon: kube-proxy [addons] Applied essential addon: kube-dns 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 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 0696ed.7cd261f787453bd9 192.168.0.100:6443 [[email protected] ~]#
kubeadm join --token 0696ed.7cd261f787453bd9 192.168.0.100:6443 这个一定要记住,以后无法重现，添加节点需要
[[email protected] ~]# kubeadm join --token 0696ed.7cd261f787453bd9 192.168.0.100:6443 [kubeadm] WARNING: kubeadm is in beta,please do not use it for production clusters. [preflight] Running pre-flight checks [preflight] WARNING: docker version is greater than the most recently validated version. Docker version: 17.09.0-ce. Max validated version: 1.12 [preflight] WARNING: kubelet service is not enabled,please run 'systemctl enable kubelet.service' [preflight] StarTing the kubelet service [discovery] Trying to connect to API Server "192.168.0.100:6443" [discovery] Created cluster-info discovery client,requesTing info from "https://192.168.0.100:6443" [discovery] Cluster info signature and contents are valid,will use API Server "https://192.168.0.100:6443" [discovery] successfully established connection with API Server "192.168.0.100:6443" [bootstrap] Detected server version: v1.7.10 [bootstrap] The server supports the Certificates API (certificates.k8s.io/v1beta1) [csr] Created API client to obtain unique certificate for this node,generating keys and certificate signing request [csr] Received signed certificate from the API server,generating KubeConfig... [kubeconfig] Wrote KubeConfig file to disk: "/etc/kubernetes/kubelet.conf" Node join complete: * Certificate signing request sent to master and response received. * Kubelet informed of new secure connection details. Run 'kubectl get nodes' on the master to see this machine join.
[[email protected] ~]# mkdir -p $HOME/.kube [[email protected] ~]# cp -i /etc/kubernetes/admin.conf $HOME/.kube/config [[email protected] ~]# chown $(id -u):$(id -g) $HOME/.kube/config
在Master上安装flAnnel
docker pull quay.io/coreos/flAnnel:v0.8.0-amd64 kubectl apply -f https://raw.githubusercontent.com/coreos/flAnnel/v0.8.0/Documentation/kube-flAnnel.yml kubectl apply -f https://raw.githubusercontent.com/coreos/flAnnel/v0.8.0/Documentation/kube-flAnnel-r@R_801_11442@.yml
[[email protected] ~]# kubectl get cs NAME STATUS messaGE ERROR scheduler Healthy ok controller-manager Healthy ok etcd-0 Healthy {"health": "true"} [[email protected] ~]# kubectl get nodes NAME STATUS AGE VERSION master Ready 24m v1.7.5 node1 NotReady 45s v1.7.5 node2 NotReady 7s v1.7.5 [[email protected] ~]# kubectl get pods --all-namespaces NAMESPACE NAME READY STATUS RESTARTS AGE kube-system etcd-master 1/1 Running 0 24m kube-system kube-apiserver-master 1/1 Running 0 24m kube-system kube-controller-manager-master 1/1 Running 0 24m kube-system kube-dns-2425271678-h48rw 0/3 ImagePull@R_801_11442@kOff 0 25m kube-system kube-flAnnel-ds-28n3w 1/2 CrashLoop@R_801_11442@kOff 13 24m kube-system kube-flAnnel-ds-ndspr 0/2 ContainerCreaTing 0 41s kube-system kube-flAnnel-ds-zvx9j 0/2 ContainerCreaTing 0 1m kube-system kube-proxy-qxxzr 0/1 ImagePull@R_801_11442@kOff 0 41s kube-system kube-proxy-shkmx 0/1 ImagePull@R_801_11442@kOff 0 25m kube-system kube-proxy-vtk52 0/1 ContainerCreaTing 0 1m kube-system kube-scheduler-master 1/1 Running 0 24m [[email protected] ~]#
如果出现：The connection to the server localhost:8080 was refused - did you specify the right host or port?
解决办法： 为了使用kubectl访问apiserver，在~/.bash_profile中追加下面的环境变量： export KUBECONfig=/etc/kubernetes/admin.conf source ~/.bash_profile 重新初始化kubectl
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