kubeadm安装kubernetes-v1.13.1

kubeadm安装kubernetes-v1.13.1

centos虚拟机使用kubeadm安装k8s-v1.13.1。

机器信息如下：

主机名	ip
master	192.168.239.200
node1	192.168.239.201
node2	192.168.239.202

环境准备

设置主机名

192.168.239.200 master
192.168.239.201 node1
192.168.239.202 node2

关闭swap

swapoff -a
sed -i 's/.*swap.*/#&/' /etc/fstab

关闭防火墙

systemctl stop firewalld
systemctl disable firewalld

关闭selinux

setenforce 0

配置相关参数

net.ipv4.ip_forward=1
net.bridge.bridge-nf-call-iptables=1
net.bridge.bridge-nf-call-ip6tables=1
vm.swappiness=0

sysctl -p

docker安装

安装docker的yum源

yum-config-manager --add-repo  https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

查看docker版本

yum list docker-ce.x86_64  --showduplicates |sort -r
docker-ce.x86_64            3:18.09.0-3.el7                    docker-ce-stable
docker-ce.x86_64            18.06.1.ce-3.el7                   docker-ce-stable
docker-ce.x86_64            18.06.1.ce-3.el7                   @docker-ce-stable
docker-ce.x86_64            18.06.0.ce-3.el7                   docker-ce-stable
docker-ce.x86_64            18.03.1.ce-1.el7.centos            docker-ce-stable
docker-ce.x86_64            18.03.0.ce-1.el7.centos            docker-ce-stable
docker-ce.x86_64            17.12.1.ce-1.el7.centos            docker-ce-stable
docker-ce.x86_64            17.12.0.ce-1.el7.centos            docker-ce-stable
docker-ce.x86_64            17.09.1.ce-1.el7.centos            docker-ce-stable
docker-ce.x86_64            17.09.0.ce-1.el7.centos            docker-ce-stable
docker-ce.x86_64            17.06.2.ce-1.el7.centos            docker-ce-stable

安装docker

yum install -y --setopt=obsoletes=0 docker-ce-18.06.1.ce-3.el7

systemctl start docker
systemctl enable docker

安装kubeadm等

配置阿里云源

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

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

node结点不用安装kubectl

yum install -y kubelet kubeadm kubectl

systemctl enable kubelet
systemctl start kubelet

安装master结点

国内无法访问google的镜像源，需要自己生成放到docker hub。

如何自己生成镜像放到docker hub请看Docker Hub上自动制做Docker镜像

下载自己生成的镜像源

vim pull-kube-image.sh

#!/bin/bash
images=(kube-scheduler:v1.13.1
        kube-proxy:v1.13.1
        kube-controller-manager:v1.13.1
        kube-apiserver:v1.13.1
        pause:3.1
        coredns:1.2.6
        etcd:3.2.24)
for imagename in ${images[@]}; do
docker pull mathlsj/$imagename
docker tag mathlsj/$imagename k8s.gcr.io/$imagename
docker rmi mathlsj/$imagename
done

docker pull quay.io/coreos/flannel:v0.10.0-amd64

查看镜像源

docker images 

REPOSITORY                              TAG                 IMAGE ID            CREATED             SIZE
k8s.gcr.io/kube-scheduler               v1.13.1             9bf9c8fb24af        7 days ago          79.6MB
k8s.gcr.io/kube-proxy                   v1.13.1             6fbfd87ede1f        7 days ago          80.2MB
k8s.gcr.io/kube-controller-manager      v1.13.1             f5e8b3a9a6bf        7 days ago          146MB
k8s.gcr.io/kube-apiserver               v1.13.1             14219a09a24c        7 days ago          181MB
k8s.gcr.io/pause                        3.1                 68112c580347        8 days ago          742kB
k8s.gcr.io/coredns                      1.2.6               75ca836e805a        8 days ago          40MB
k8s.gcr.io/etcd                         3.2.24              c10486f7ea38        9 days ago          220MB
k8s.gcr.io/kubernetes-dashboard-amd64   v1.8.3              0c60bcf89900        11 months ago       102MB
quay.io/coreos/flannel                  v0.10.0-amd64       f0fad859c909        11 months ago       44.6MB

节点初始化

kubeadm init --kubernetes-version=v1.13.1 --pod-network-cidr=10.244.0.0/16 --apiserver-advertise-address=192.168.239.200

看到Your Kubernetes master has initialized successfully!就表示初始化成功了。

要使用kubectl需要以下命令

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

查看初始化情况

kubectl get nodes

NAME     STATUS   ROLES    AGE     VERSION
master   Ready    master   3d1h    v1.13.2

kubectl get pod --all-namespaces

NAMESPACE     NAME                             READY   STATUS    RESTARTS   AGE
kube-system   coredns-86c58d9df4-2nhd5         0/1     Pending   0          35m
kube-system   coredns-86c58d9df4-l2wt9         0/1     Pending   0          35m
kube-system   etcd-master                      1/1     Running   0          34m
kube-system   kube-apiserver-master            1/1     Running   0          34m
kube-system   kube-controller-manager-master   1/1     Running   0          34m
kube-system   kube-proxy-fqjvp                 1/1     Running   0          35m
kube-system   kube-scheduler-master            1/1     Running   0          34m

安装flannel网络

wget https://raw.githubusercontent.com/coreos/flannel/bc79dd1505b0c8681ece4de4c0d86c5cd2643275/Documentation/kube-flannel.yml
kubectl apply -f kube-flannel.yml

安装node结点

在安装前，先完成前面的环境准备，docker安装和安装kubeadm等。

下载镜像源

vim pull-kube-image.sh

#!/bin/bash
images=(kube-proxy:v1.13.1
        pause:3.1
        coredns:1.2.6)
for imagename in ${images[@]}; do
docker pull mathlsj/$imagename
docker tag mathlsj/$imagename k8s.gcr.io/$imagename
docker rmi mathlsj/$imagename
done

docker pull quay.io/coreos/flannel:v0.10.0-amd64

查看镜像

docker images

REPOSITORY                              TAG                 IMAGE ID            CREATED             SIZE
k8s.gcr.io/kube-proxy                   v1.13.1             6fbfd87ede1f        7 days ago          80.2MB
k8s.gcr.io/pause                        3.1                 68112c580347        8 days ago          742kB
k8s.gcr.io/coredns                      1.2.6               75ca836e805a        8 days ago          40MB
quay.io/coreos/flannel                  v0.10.0-amd64       f0fad859c909        11 months ago       44.6MB

查看token,在master结点上看

kubeadm token list

TOKEN                     TTL       EXPIRES                     USAGES                   DESCRIPTION                                                EXTRA GROUPS
km7adp.vu3fugeopqgyj8rk   23h       2019-01-15T09:22:48-05:00   authentication,signing   The default bootstrap token generated by 'kubeadm init'.   system:bootstrappers:kubeadm:default-node-token

加入节点

kubeadm join --discovery-token km7adp.vu3fugeopqgyj8rk --discovery-token-ca-cert-hash sha256:4e05312726ad565688309951d6c8afb2965e1ce80f736d0123b4363581fcb106 192.168.239.200:6443

在master上查看状态

kubectl get nodes

NAME     STATUS   ROLES    AGE   VERSION
master   Ready    master   92m   v1.13.2
node1    Ready    <none>   41m   v1.13.2

kubectl get pods --all-namespaces -o wide

NAMESPACE     NAME                             READY   STATUS    RESTARTS   AGE   IP                NODE     NOMINATED NODE   READINESS GATES
kube-system   coredns-86c58d9df4-2nhd5         1/1     Running   0          84m   10.244.1.2        node1    <none>           <none>
kube-system   coredns-86c58d9df4-l2wt9         1/1     Running   0          84m   10.244.1.3        node1    <none>           <none>
kube-system   etcd-master                      1/1     Running   0          83m   192.168.239.200   master   <none>           <none>
kube-system   kube-apiserver-master            1/1     Running   0          83m   192.168.239.200   master   <none>           <none>
kube-system   kube-controller-manager-master   1/1     Running   0          83m   192.168.239.200   master   <none>           <none>
kube-system   kube-flannel-ds-amd64-786l8      1/1     Running   0          16m   192.168.239.200   master   <none>           <none>
kube-system   kube-flannel-ds-amd64-pc4fp      1/1     Running   0          16m   192.168.239.201   node1    <none>           <none>
kube-system   kube-proxy-fqjvp                 1/1     Running   0          84m   192.168.239.200   master   <none>           <none>
kube-system   kube-proxy-skndl                 1/1     Running   0          33m   192.168.239.201   node1    <none>           <none>
kube-system   kube-scheduler-master            1/1     Running   0          83m   192.168.239.200   master   <none>           <none>

参考文档

• http://blog.51cto.com/lullaby/2150610?utm_source=oschina-app
• https://my.oschina.net/u/2601623/blog/1634641
• https://kubernetes.io/docs/setup/independent/install-kubeadm/