centos k8s离线安装

centos  k8s离线安装(转载)

 

下载离线包

链接:https://pan.baidu.com/s/1iQJpKZ9PdFjhz9yTgl0Wjg 密码:gwmh

 

 

1. 环境准备

主机名

IP

配置

master1

192.168.1.181

1C 4G

node1

192.168.1.182

2C 6G

准备不低于2台虚机。 1台 master,其余的做node

OS: Centos7.3 mini install。 最小化安装。配置节点IP

主机名

IP

配置

master1

192.168.1.181

1C 4G

node1

192.168.1.182

2C 6G

分别设置主机名为master1 node1 ... 时区

timedatectl set-timezone Asia/Shanghai #都要执行 hostnamectl set-hostname master1 #master1执行 hostnamectl set-hostname node1 #node1执行

在所有节点/etc/hosts中添加解析,master1,node1

127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4 ::1 localhost localhost.localdomain localhost6 localhost6.localdomain6 192.168.1.181 matser1 192.168.1.182 node1

关闭所有节点的seliux以及firewalld

sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/config setenforce 0 systemctl disable firewalld systemctl stop firewalld

 

 

2. 安装docker

使用文件docker-packages.tar,每个节点都要安装。

tar -xvf docker-packages.tar cd docker-packages rpm -Uvh * 或者 yum install local *.rpm 进行安装 docker version #安装完成查看版本

启动docker,并设置为开机自启

systemctl start docker && systemctl enable docker

输入docker info,==记录Cgroup Driver==

Cgroup Driver: cgroupfs

docker和kubelet的cgroup driver需要一致,如果docker不是cgroupfs,则执行

cat << EOF > /etc/docker/daemon.json { "exec-opts": ["native.cgroupdriver=cgroupfs"] } EOF systemctl daemon-reload && systemctl restart docker

2. 安装kubeadm,kubectl,kubelet

使用文件kube-packages-1.10.1.tar,每个节点都要安装

kubeadm是集群部署工具

kubectl是集群管理工具,通过command来管理集群

kubelet的k8s集群每个节点的docker管理服务

tar -xvf kube-packages-1.10.1.tar cd kube-packages-1.10.1 rpm -Uvh * 或者 yum install local *.rpm 进行安装

在所有kubernetes节点上设置kubelet使用cgroupfs,与dockerd保持一致,否则kubelet会启动报错

默认kubelet使用的cgroup-driver=systemd,改为cgroup-driver=cgroupfs sed -i "s/cgroup-driver=systemd/cgroup-driver=cgroupfs/g" /etc/systemd/system/kubelet.service.d/10-kubeadm.conf 重设kubelet服务,并重启kubelet服务 systemctl daemon-reload && systemctl restart kubelet

关闭swap,及修改iptables,不然后面kubeadm会报错

swapoff -a vi /etc/fstab #swap一行注释

cat < /etc/sysctl.d/k8s.conf net.bridge.bridge-nf-call-ip6tables = 1 net.bridge.bridge-nf-call-iptables = 1 EOF sysctl --system

3. 导入镜像

使用文件k8s-images-1.10.tar.gz,每个节点都要执行

节点较少,就不搭建镜像仓库服务了,后续要用的应用镜像,每个节点都要导入

docker load -i k8s-images-1.10.tar.gz 一共11个镜像,分别是

k8s.gcr.io/etcd-amd64:3.1.12

k8s.gcr.io/kube-apiserver-amd64:v1.10.1

k8s.gcr.io/kube-controller-manager-amd64:v1.10.1

k8s.gcr.io/kube-proxy-amd64:v1.10.1

k8s.gcr.io/kube-scheduler-amd64:v1.10.1

k8s.gcr.io/pause-amd64:3.1 k8s.gcr.io/k8s-dns-kube-dns-amd64:1.14.8

k8s.gcr.io/k8s-dns-dnsmasq-nanny-amd64:1.14.8

k8s.gcr.io/k8s-dns-sidecar-amd64:1.14.8

k8s.gcr.io/kubernetes-dashboard-amd64:v1.8.3 quay.io/coreos/flannel:v0.9.1-amd64

4. kubeadm init 部署master节点

只在master执行。此处选用最简单快捷的部署方案。etcd、api、controller-manager、 scheduler服务都会以容器的方式运行在master。etcd 为单点,不带证书。etcd的数据会挂载到master节点/var/lib/etcd

init部署是支持etcd 集群和证书模式的,配置方法见我1.9的文档,此处略过。

init命令注意要指定版本,和pod范围

kubeadm init --kubernetes-version=v1.10.1 --pod-network-cidr=10.244.0.0/16 Your Kubernetes master has initialized successfully! To start using your cluster, you need to run the following 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: https://kubernetes.io/docs/concepts/cluster-administration/addons/ You can now join any number of machines by running the following on each node as root: kubeadm join 192.168.1.181:6443 --token wct45y.tq23fogetd7rp3ck --discovery-token-ca-cert-hash sha256:c267e2423dba21fdf6fc9c07e3b3fa17884c4f24f0c03f2283a230c70b07772f

记下join的命令,后续node节点加入的时候要用到

执行提示的命令,保存kubeconfig

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

此时执行kubectl get node 已经可以看到master节点,notready是因为还未部署网络插件

[root@master1 kubernetes1.10]# kubectl get node NAME STATUS ROLES AGE VERSION master1 NotReady master 3m v1.10.1

查看所有的pod,kubectl get pod --all-namespaces

kubedns也依赖于容器网络,此时pending是正常的

[root@master1 kubernetes1.10]# kubectl get pod --all-namespaces

NAMESPACE NAME READY STATUS RESTARTS AGE

kube-system etcd-master1 1/1 Running 0 3m kube-system kube-apiserver-master1 1/1 Running 0 3m kube-system kube-controller-manager-master1 1/1 Running 0 3m kube-system kube-dns-86f4d74b45-5nrb5 0/3 Pending 0 4m kube-system kube-proxy-ktxmb 1/1 Running 0 4m kube-system kube-scheduler-master1 1/1 Running 0 3m

配置KUBECONFIG变量

echo "export KUBECONFIG=/etc/kubernetes/admin.conf" >> /etc/profile source /etc/profile echo $KUBECONFIG #应该返回/etc/kubernetes/admin.conf

5. 部署flannel网络

k8s支持多种网络方案,flannel,calico,openvswitch

此处选择flannel。 在熟悉了k8s部署后,可以尝试其他网络方案,我另外一篇1.9部署中有介绍flannel和calico的方案,以及切换时需要的动作。

kubectl apply -f kube-flannel.yml 网络就绪后,节点的状态会变为ready

[root@master1 kubernetes1.10]# kubectl get node NAME STATUS ROLES AGE VERSION

master1 Ready master 18m v1.10.1

6. kubeadm join 加入node节点

6.1 node节点加入集群

使用之前kubeadm init 生产的join命令,加入成功后,回到master节点查看是否成功

kubeadm join 192.168.1.181:6443 --token wct45y.tq23fogetd7rp3ck --discovery-token-ca-cert-hash sha256:c267e2423dba21fdf6fc9c07e3b3fa17884c4f24f0c03f2283a230c70b07772f [root@master1 kubernetes1.10]# kubectl get node NAME STATUS ROLES AGE VERSION master1 Ready master 31m v1.10.1 node1 Ready 44s v1.10.1

至此,集群已经部署完成。

6.2 如果出现x509这个报错

如果有报错才需要做这一步,不然不需要。

这是因为master节点缺少KUBECONFIG变量

[discovery] Failed to request cluster info, will try again: [Get https://192.168.1.181:6443/api/v1/namespaces/kube-public/configmaps/cluster-info: x509: certificate has expired or is not yet valid]

master节点执行

export KUBECONFIG=$HOME/.kube/config

node节点kubeadm reset 再join

kubeadm reset kubeadm join xxx ...

6.3 如果忘了join命令,加入节点方法

若node已经成功加入,忽略这一步。

使用场景:忘了保存上面kubeadm init生产的join命令,可按照下面的方法加入node节点。

首先master节点获取token,如果token list内容为空,则kubeadm token create创建一个,记录下token数据

[root@master1 kubernetes1.10]# kubeadm token list TOKEN TTL EXPIRES USAGES DESCRIPTION EXTRA GROUPS wct45y.tq23fogetd7rp3ck 22h 2018-04-26T21:38:57+08:00 authentication,signing The default bootstrap token generated by 'kubeadm init'. system:bootstrappers:kubeadm:default-node-token

node节点执行如下,把token部分进行替换

kubeadm join --token wct45y.tq23fogetd7rp3ck 192.168.1.181:6443 --discovery-token-unsafe-skip-ca-verification

7. 部署k8s ui界面,dashboard

dashboard是官方的k8s 管理界面,可以查看应用信息及发布应用。dashboard的语言是根据浏览器的语言自己识别的

官方默认的dashboard为https方式,如果用chrome访问会拒绝。本次部署做了修改,方便使用,使用了http方式,用chrome访问正常。

一共需要导入3个yaml文件

kubectl apply -f kubernetes-dashboard-http.yaml kubectl apply -f admin-role.yaml kubectl apply -f kubernetes-dashboard-admin.rbac.yaml

[root@master1 kubernetes1.10]# kubectl apply -f kubernetes-dashboard-http.yaml serviceaccount "kubernetes-dashboard" created role.rbac.authorization.k8s.io "kubernetes-dashboard-minimal" created rolebinding.rbac.authorization.k8s.io "kubernetes-dashboard-minimal" created deployment.apps "kubernetes-dashboard" created service "kubernetes-dashboard" created

[root@master1 kubernetes1.10]# kubectl apply -f admin-role.yaml clusterrolebinding.rbac.authorization.k8s.io "kubernetes-dashboard" created [root@master1 kubernetes1.10]# kubectl apply -f kubernetes-dashboard-admin.rbac.yaml clusterrolebinding.rbac.authorization.k8s.io "dashboard-admin" created

创建完成后,通过 http://任意节点的IP:31000即可访问ui

8. EFK和监控

这两部分后续会单独写如何部署。

9. FAQ

9.1 kubectl 命令补全

root@master1:/# vim /etc/profilecd #添加下面这句,再source source <(kubectl completion bash) root@master1:/# source /etc/profile

9.2 master节点默认不可部署pod

执行如下,node-role.kubernetes.io/master 可以在 kubectl edit node master1中taint配置参数下查到

root@master1:/var/lib/kubelet# kubectl taint node master1 node-role.kubernetes.io/master- node "master1" untainted

9.3 node节点pod无法启动/节点删除网络重置

node1之前反复添加过,添加之前需要清除下网络

root@master1:/var/lib/kubelet# kubectl get po -o wide NAME READY STATUS RESTARTS AGE IP NODE nginx-8586cf59-6zw9k 1/1 Running 0 9m 10.244.3.3 node2 nginx-8586cf59-jk5pc 0/1 ContainerCreating 0 9m node1 nginx-8586cf59-vm9h4 0/1 ContainerCreating 0 9m node1 nginx-8586cf59-zjb84 1/1 Running 0 9m 10.244.3.2 node2

root@node1:~# journalctl -u kubelet failed: rpc error: code = Unknown desc = NetworkPlugin cni failed to set up pod "nginx-8586cf59-rm4sh_default" network: failed to set bridge addr: "cni0" already has an IP address different from 10.244.2.1/24 12252 cni.go:227] Error while adding to cni network: failed to set bridge addr: "cni0" already

重置kubernetes服务,重置网络。删除网络配置,link

kubeadm reset systemctl stop kubelet systemctl stop docker rm -rf /var/lib/cni/ rm -rf /var/lib/kubelet/* rm -rf /etc/cni/ ifconfig cni0 down ifconfig flannel.1 down ifconfig docker0 down ip link delete cni0 ip link delete flannel.1 systemctl start docker

 

加入节点

systemctl start docker

kubeadm join --token 55c2c6.2a4bde1bc73a6562 192.168.1.144:6443 --discovery-token-ca-cert-hash sha256:0fdf8cfc6fecc18fded38649a4d9a81d043bf0e4bf57341239250dcc62d2c832

 

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