CentOS7中怎么安装 Kubernetes集群
CentOS7中怎么安装 Kubernetes集群,针对这个问题,这篇文章详细介绍了相对应的分析和解答,希望可以帮助更多想解决这个问题的小伙伴找到更简单易行的方法。
CentOS7(mini) 安装 Kubernetes 集群(kubeadm方式)
安装CentOS
安装net-tools
[root@localhost ~]# yum install -y net-tools
关闭firewalld
[root@localhost ~]# systemctl stop firewalld && systemctl disable firewalldRemoved 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
安装Docker
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。
安装yum源工具包
[root@localhost ~]# yum install -y yum-utils device-mapper-persistent-data lvm2
下载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是不开发版,不稳定,下载stable版
yum-config-manager --disable docker-ce-edge
更新本地YUM源缓存
yum makecache fast
安装Docker-ce相应版本的
yum -y install docker-ce
运行hello world
[root@localhost ~]# systemctl start docker[root@localhost ~]# docker run hello-worldUnable to find image 'hello-world:latest' locallylatest: Pulling from library/hello-world9a0669468bf7: Pull completeDigest: sha256:0e06ef5e1945a718b02a8c319e15bae44f47039005530bc617a5d071190ed3fcStatus: Downloaded newer image for hello-world:latestHello 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 bashShare 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/
安装kubelet与kubeadm包
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
使用DaoCloud加速器(可以跳过这一步)
[root@localhost ~]# curl -sSL https://get.daocloud.io/daotools/set_mirror.sh | sh -s http://0d236e3f.m.daocloud.iodocker 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/$imageNamedone
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=Kubernetesbaseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/enabled=1gpgcheck=0EOF
查看kubectl kubelet kubeadm kubernetes-cni列表
[root@localhost ~]# yum list kubectl kubelet kubeadm kubernetes-cni已加载插件:fastestmirrorLoading 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 kuberneteskubectl.x86_64 1.7.5-0 kuberneteskubelet.x86_64 1.7.5-0 kuberneteskubernetes-cni.x86_64 0.5.1-0 kubernetes[root@localhost ~]#
安装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
[root@kub-master ~]# vi /etc/systemd/system/kubelet.service.d/10-kubeadm.conf
Environment="KUBELET_CADVISOR_ARGS=--cadvisor-port=4194"
启动所有主机上的kubelet服务
[root@master ~]# systemctl enable kubelet && systemctl start kubelet
初始化master master节点上操作
[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-dnsYour 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/configYou 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 nodeas root: kubeadm join --token 0696ed.7cd261f787453bd9 192.168.0.100:6443[root@master ~]#
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
添加节点
[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上安装flannel
docker pull quay.io/coreos/flannel:v0.8.0-amd64kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/v0.8.0/Documentation/kube-flannel.ymlkubectl apply -f https://raw.githubusercontent.com/coreos/flannel/v0.8.0/Documentation/kube-flannel-rbac.yml
查看集群
[root@master ~]# kubectl get csNAME STATUS MESSAGE ERRORscheduler Healthy okcontroller-manager Healthy oketcd-0 Healthy {"health": "true"}[root@master ~]# kubectl get nodesNAME STATUS AGE VERSIONmaster Ready 24m v1.7.5node1 NotReady 45s v1.7.5node2 NotReady 7s v1.7.5[root@master ~]# kubectl get pods --all-namespacesNAMESPACE NAME READY STATUS RESTARTS AGEkube-system etcd-master 1/1 Running 0 24mkube-system kube-apiserver-master 1/1 Running 0 24mkube-system kube-controller-manager-master 1/1 Running 0 24mkube-system kube-dns-2425271678-h58rw 0/3 ImagePullBackOff 0 25mkube-system kube-flannel-ds-28n3w 1/2 CrashLoopBackOff 13 24mkube-system kube-flannel-ds-ndspr 0/2 ContainerCreating 0 41skube-system kube-flannel-ds-zvx9j 0/2 ContainerCreating 0 1mkube-system kube-proxy-qxxzr 0/1 ImagePullBackOff 0 41skube-system kube-proxy-shkmx 0/1 ImagePullBackOff 0 25mkube-system kube-proxy-vtk52 0/1 ContainerCreating 0 1mkube-system kube-scheduler-master 1/1 Running 0 24m[root@master ~]#
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