重慶分公司
重慶分公司，新征程啟航
為企業提供網站建設、域名注冊、服務器等服務
CentOS7中怎么安裝Kubernetes集群
CentOS7中怎么安裝 Kubernetes集群，針對這個問題，這篇文章詳細介紹了相對應的分析和解答，希望可以幫助更多想解決這個問題的小伙伴找到更簡單易行的方法。
目前創新互聯已為1000多家的企業提供了網站建設、域名、虛擬主機、網站運營、企業網站設計、杜集網站維護等服務，公司將堅持客戶導向、應用為本的策略，正道將秉承"和諧、參與、激情"的文化，與客戶和合作伙伴齊心協力一起成長，共同發展。
CentOS7(mini) 安裝 Kubernetes 集群（kubeadm方式）
安裝CentOS
安裝net-tools
[root@localhost ~]# yum install -y net-tools
關閉firewalld
[root@localhost ~]# 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. [root@localhost ~]# setenforce 0 [root@localhost ~]# sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/config
安裝Docker
如今Docker分為了Docker-CE和Docker-EE兩個版本，CE為社區版即免費版，EE為企業版即商業版。我們選擇使用CE版。
安裝yum源工具包
[root@localhost ~]# yum install -y yum-utils device-mapper-persistent-data lvm2
下載docker-ce官方的yum源配置文件
[root@localhost ~]# yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
禁用docker-c-edge源配edge是不開發版，不穩定，下載stable版
yum-config-manager --disable docker-ce-edge
更新本地YUM源緩存
yum makecache fast
安裝Docker-ce相應版本的
yum -y install docker-ce
運行hello world
[root@localhost ~]# systemctl start docker [root@localhost ~]# 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/
安裝kubelet與kubeadm包
使用kubeadm init命令初始化集群之下載Docker鏡像到所有主機的實始化時會下載kubeadm必要的依賴鏡像，同時安裝etcd,kube-DNS,kube-proxy,由于我們GFW防火墻問題我們不能直接訪問，因此先通過其它方法下載下面列表中的鏡像，然后導入到系統中，再使用kubeadm init來初始化集群
使用DaoCloud加速器(可以跳過這一步)
[root@localhost ~]# 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
[root@localhost ~]# systemctl restart docker下載鏡像,自己通過Dockerfile到dockerhub生成對鏡像,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
添加阿里源
[root@localhost ~]# 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
查看kubectl kubelet kubeadm kubernetes-cni列表
[root@localhost ~]# yum list kubectl kubelet kubeadm kubernetes-cni 已加載插件：fastestmirror Loading mirror speeds from cached hostfile * base: mirrors.tuna.tsinghua.edu.cn * extras: mirrors.sohu.com * updates: mirrors.sohu.com 可安裝的軟件包 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 [root@localhost ~]#
安裝kubectl kubelet kubeadm kubernetes-cni
[root@localhost ~]# yum install -y kubectl kubelet kubeadm kubernetes-cni
修改cgroups
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監控的端口，默認為0改為4194，這樣就可以通過瀏器查看kubelet的監控cAdvisor的web頁
[root@kub-master ~]# vi /etc/systemd/system/kubelet.service.d/10-kubeadm.conf
Environment="KUBELET_CADVISOR_ARGS=--cadvisor-port=4194"
啟動所有主機上的kubelet服務
[root@master ~]# systemctl enable kubelet && systemctl start kubelet
初始化master master節點上操作
[root@master ~]# 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 RBAC] [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 RBAC 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 [root@master ~]#
kubeadm join --token 0696ed.7cd261f787453bd9 192.168.0.100:6443這個一定要記住,以后無法重現，添加節點需要
添加節點
[root@node1 ~]# 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.
在master配置kubectl的kubeconfig文件
[root@master ~]# mkdir -p $HOME/.kube [root@master ~]# cp -i /etc/kubernetes/admin.conf $HOME/.kube/config [root@master ~]# chown $(id -u):$(id -g) $HOME/.kube/config
在Master上安裝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-rbac.yml
查看集群
[root@master ~]# kubectl get cs
NAME STATUS MESSAGE ERROR
scheduler Healthy ok
controller-manager Healthy ok
etcd-0 Healthy {"health": "true"}
[root@master ~]# 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
[root@master ~]# 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-h58rw 0/3 ImagePullBackOff 0 25m
kube-system kube-flannel-ds-28n3w 1/2 CrashLoopBackOff 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 ImagePullBackOff 0 41s
kube-system kube-proxy-shkmx 0/1 ImagePullBackOff 0 25m
kube-system kube-proxy-vtk52 0/1 ContainerCreating 0 1m
kube-system kube-scheduler-master 1/1 Running 0 24m
[root@master ~]#關于CentOS7中怎么安裝 Kubernetes集群問題的解答就分享到這里了，希望以上內容可以對大家有一定的幫助，如果你還有很多疑惑沒有解開，可以關注創新互聯行業資訊頻道了解更多相關知識。
網站欄目：CentOS7中怎么安裝Kubernetes集群
分享URL：http://www.xueling.net.cn/article/ghsdsp.html