centos7 安装k8s

从过去以物理机和虚拟机为主体的开发运维环境，向以容器为核心的基础设施的转变过程，并不是一次温和的改革，而是涵盖了对网络、存储、调度、操作系统、分布式原理等各个方面的容器化理解和改造。

 

配置

2g内存2cpu

内核

Linux 4.17.11-1.el7.elrepo.x86_64

 

然后进入虚拟机可用命令查看ip地址查看互通

ip addr show

用swap分区

sudo swapoff -a

  永久禁用

sudo vi /etc/fstab

把/dev/mapper/centos-swap swap这行注释掉

  编写配置

vim /etc/sysctl.d/k8s.conf

net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1    
vm.swappiness=0

sysctl --system

2. 配置kubernetes yum源

vim  /etc/yum.repos.d/kubernetes.repo

[kubernetes]
name=kubernetes
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/
gpgcheck=0
enable=1

======================== 执行：

cd /etc/yum.repos.d/

wget https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

yum clean all

yum repolist

安装

安装kubeadm, kubelet and kubectl

yum install docker-ce kubelet-1.11.1 kubeadm-1.11.1  kubectl-1.11.1 kubernetes-cni

systemctl enable docker
systemctl enable kubelet.service
systemctl start docker
systemctl start kubelet

3.由于国内网络原因，kubernetes的镜像托管在google云上，无法直接下载，所以直接把把镜像搞下来有个技术大牛把gcr.io的镜像

每天同步到https://github.com/anjia0532/gcr.io_mirror这个站点，因此，如果需要用到gcr.io的镜像，可以执行如下的脚本进行镜像拉取

vim pullimages.sh

#!/bin/bash
images=(kube-proxy-amd64:v1.11.1 kube-scheduler-amd64:v1.11.1 kube-controller-manager-amd64:v1.11.1
kube-apiserver-amd64:v1.11.1 etcd-amd64:3.2.18 coredns:1.1.3 pause:3.1 )
for imageName in ${images[@]} ; do
docker pull anjia0532/google-containers.$imageName
docker tag anjia0532/google-containers.$imageName k8s.gcr.io/$imageName
docker rmi anjia0532/google-containers.$imageName
done

sh pullimages.sh

5.kubernetes集群不允许开启swap，所以我们需要忽略这个错误

vim /etc/sysconfig/kubelet

KUBELET_EXTRA_ARGS="--fail-swap-on=false"

编写kubeadm.yaml

vim kubeadm.yaml

apiVersion: kubeadm.k8s.io/v1alpha1
kind: MasterConfiguration
controllerManagerExtraArgs:
  horizontal-pod-autoscaler-use-rest-clients: "true"
  horizontal-pod-autoscaler-sync-period: "10s"
  node-monitor-grace-period: "10s"
apiServerExtraArgs:
  runtime-config: "api/all=true"
kubernetesVersion: "v1.11.1"

kubeadm init --config kubeadm.yaml

这样就可以完成 Kubernetes Master 的部署了，这个过程只需要几分钟，部署完成后，kubeadm 会生成一行指令：

kubeadm join 10.168.0.2:6443 --token 00bwbx.uvnaa2ewjflwu1ry --discovery-token-ca-cert-hash 
sha256:00eb62a2a6020f94132e3fe1ab721349bbcd3e9b94da9654cfe15f2985ebd711

4.配置kubectl与apiserver的认证

mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config

检查健康状态

kubectl get cs

查看节点状态

kubectl get nodes

现在，我们就可以使用 kubectl get 命令来查看当前唯一一个节点的状态了：

kubectl get nodes

部署网络插件Weave

kubectl apply -f https://git.io/weave-kube-1.6

查看

kubectl get pods -n kube-system

[root@localhost ~]# kubectl get pods -n kube-system
NAME                                            READY     STATUS    RESTARTS   AGE
coredns-78fcdf6894-csxpw                        1/1       Running   0          27m
coredns-78fcdf6894-td848                        1/1       Running   0          27m
etcd-localhost.localdomain                      1/1       Running   0          26m
kube-apiserver-localhost.localdomain            1/1       Running   0          26m
kube-controller-manager-localhost.localdomain   1/1       Running   0          26m
kube-proxy-v78j8                                1/1       Running   0          27m
kube-scheduler-localhost.localdomain            1/1       Running   0          26m
weave-net-vcnb6                                 2/2       Running   0          44s

加入污点

kubectl taint nodes --all node-role.kubernetes.io/master-

可视化插件，下载镜像

wget https://raw.githubusercontent.com/kubernetes/dashboard/master/src/deploy/recommended/kubernetes-dashboard.yaml

docker pull anjia0532/google-containers.kubernetes-dashboard-amd64:v1.10.0
docker tag  anjia0532/google-containers.kubernetes-dashboard-amd64:v1.10.0   k8s.gcr.io/kubernetes-dashboard-amd64:v1.10.0
docker rmi  anjia0532/google-containers.kubernetes-dashboard-amd64:v1.10.0 

修改kubernetes-dashboard.yaml，可以直接token认证进入

kind: Service
apiVersion: v1
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: kube-system
spec:
  # 添加Service的type为NodePort
  type: NodePort
  ports:
    - port: 443
      targetPort: 8443
      # 添加映射到虚拟机的端口,k8s只支持30000以上的端口
      nodePort: 30001
  selector:
    k8s-app: kubernetes-dashboard

 

kubectl apply -f   kubernetes-dashboard.yaml

看 Dashboard 对应的 Pod 的状态了

kubectl get pods -n kube-system

部署容器存储插件，下载镜像

kubectl apply -f https://raw.githubusercontent.com/rook/rook/master/cluster/examples/kubernetes/ceph/operator.yaml
kubectl apply -f https://raw.githubusercontent.com/rook/rook/master/cluster/examples/kubernetes/ceph/cluster.yaml

查看安装情况

kubectl get pods -n rook-ceph-system
kubectl get pods -n rook-ceph

开启服务

nohup  kubectl proxy --address='0.0.0.0'  --accept-hosts='^*$'  --disable-filter=true &

获取token命令

kubectl -n kube-system describe $(kubectl -n kube-system get secret -n kube-system -o name | grep namespace) | grep token

访问dashboard

通过node节点的ip，加刚刚我们设置的nodePort就可以访问了。

https://<node-ip>:<node-port>

下面是我成功的结果图

备忘：

查看全部节点

kubectl get pods --all-namespaces

查看pods

kubectl describe pod -n kube-system

查看具体问题

kubectl describe pod kubernetes-dashboard-767dc7d4d-mg5gw -n kube-system

参考：

https://jusene.me/2018/09/10/k8s-1/

http://blog.51cto.com/ghbsunny/2162205?source=dra

https://my.oschina.net/andylo25/blog/1618342

https://imroc.io/posts/kubernetes/install-kubernetes-1.9-on-centos7-with-kubeadm/

https://segmentfault.com/a/1190000013681047

https://www.centos.bz/2018/07/kubernetes%E7%9A%84dashboard%E7%99%BB%E5%BD%95%E6%96%B9%E5%BC%8F/