使用kebuadm安装Kubernetes
使用kebuadm安装Kubernetes一、环境准备机器准备硬件需求IPk8s-master4C、8G192.168.1.220k8s-node4C、8G192.168.1.221二、基础环境搭建1.docker安装docker环境搭建2.系统设置(关闭Firewalld、SELinux、swap分区;默认所有节点执行)systemctl stop firewalld && sy
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使用kebuadm安装Kubernetes
一、环境准备
机器准备 | 硬件需求 | IP |
---|---|---|
k8s-master | 4C、8G | 192.168.1.220 |
k8s-node | 4C、8G | 192.168.1.221 |
二、基础环境搭建
1.docker安装
2.系统设置(关闭Firewalld、SELinux、swap分区;默认所有节点执行)
systemctl stop firewalld && systemctl disable firewalld
setenforce 0
sed -i 's/SELINUX=enforcing/SELINUX=disabled/' /etc/selinux/config
swapoff -a
#注释文件系统类型为swap的行
vim /etc/fstab
#/dev/mapper/centos-swap swap swap defaults 0 0
主机名设置(k8s-master):
hostname k8s-master && hostnamectl set-hostname k8s-master
主机名设置(k8s-node):
hostname k8s-node && hostnamectl set-hostname k8s-node
systemctl start docker && systemctl enable docker
cat >> /etc/hosts <<EOF
192.168.1.220 k8s-master
192.168.1.221 k8s-node
EOF
cat > /etc/sysctl.d/k8s.conf <<EOF
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF
sysctl --system
三、安装k8s
1.安装kubectl、kubelet、kubeadm(所有节点执行)
cat <<EOF > /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF
yum makecache fast
yum install -y kubectl kubelet kubeadm
2.初始化主节点(k8s-master执行)
# 由于kubeadm 默认从官网k8s.grc.io下载所需镜像,国内无法访问,因此需要通过–-image-repository指定阿里云镜像仓库地址
kubeadm init --apiserver-advertise-address=192.168.1.220 --image-repository registry.aliyuncs.com/google_containers --service-cidr=10.10.0.0/16 --pod-network-cidr=10.122.0.0/16
说明: 可通过–kubernetes-version=1.18.0指定版本号;期间会下载以下镜像,需要消耗5~10分钟!
k8s.gcr.io/kube-apiserver:v1.19.2
k8s.gcr.io/kube-controller-manager:v1.19.2
k8s.gcr.io/kube-scheduler:v1.19.2
k8s.gcr.io/kube-proxy:v1.19.2
k8s.gcr.io/pause:3.2
k8s.gcr.io/etcd:3.4.13-0
k8s.gcr.io/coredns:1.7.0
也可使用如下脚本,提取拉取拉取镜像:
for i in `kubeadm config images list`; do
imageName=${i#k8s.gcr.io/}
docker pull registry.aliyuncs.com/google_containers/$imageName
docker tag registry.aliyuncs.com/google_containers/$imageName k8s.gcr.io/$imageName
docker rmi registry.aliyuncs.com/google_containers/$imageName
done;
执行成功后会提示如下信息:
Your Kubernetes control-plane 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/
Then you can join any number of worker nodes by running the following on each as root:
kubeadm join 192.168.1.220:6443 --token l12ocz.b4bm0a7kunh3yrbg \
--discovery-token-ca-cert-hash sha256:8db373ea1f61ddaab29aa61b566c185aeccd9e35aab744ed6814cd33f9115a5e
# 复制admin.conf文件
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
# master节点为NotReady,因为corednspod没有启动,缺少网络pod
kubectl get pod --all-namespaces
kubectl get nodes
# 打印join-command
kubeadm token create --print-join-command
3.加入node节点(k8s-node执行)
kubeadm join 192.168.1.220:6443 --token l12ocz.b4bm0a7kunh3yrbg \
--discovery-token-ca-cert-hash sha256:8db373ea1f61ddaab29aa61b566c185aeccd9e35aab744ed6814cd33f9115a5e
4.bash命令补全(所有节点)
yum -y install bash-completion
source <(kubectl completion bash)
5.安装网络组件(k8s-master执行)
网络组件:flannel、Canal、Calico、weave
# 安装Calico
kubectl apply -f https://docs.projectcalico.org/manifests/calico.yaml
# 卸载Calico
# kubectl delete -f https://docs.projectcalico.org/manifests/calico.yaml
kubectl get pod --all-namespaces
kubectl get nodes
# 执行结果如下
[root@k8s-master ~]# kubectl get pod --all-namespaces
NAMESPACE NAME READY STATUS RESTARTS AGE
kube-system calico-kube-controllers-8f59968d4-cl7n5 1/1 Running 4 9m40s
kube-system calico-node-8xkjs 0/1 Running 0 9m40s
kube-system calico-node-h9vft 0/1 Running 0 9m40s
kube-system coredns-6d56c8448f-w9tp6 1/1 Running 1 63m
kube-system coredns-6d56c8448f-z6jnm 1/1 Running 1 63m
kube-system etcd-k8s-master 1/1 Running 0 63m
kube-system kube-apiserver-k8s-master 1/1 Running 0 63m
kube-system kube-controller-manager-k8s-master 1/1 Running 0 63m
kube-system kube-proxy-7t644 1/1 Running 0 63m
kube-system kube-proxy-b845t 1/1 Running 0 55m
kube-system kube-scheduler-k8s-master 1/1 Running 0 63m
[root@k8s-master ~]# kubectl get nodes
NAME STATUS ROLES AGE VERSION
chain1 Ready master 63m v1.19.2
chain2 Ready <none> 55m v1.19.2
注意: 若机器之前安装过k8s或rancher,请将对应网络组件清除。
例如:清理flannel网络插件残留
ifconfig cni0 down
ip link delete cni0
ifconfig flannel.1 down
ip link delete flannel.1
rm -rf /var/lib/cni/
rm -f /etc/cni/net.d/*
遇到问题:Calico官方默认配置下,有时会发现不了真实网卡接口,Calico相关容器报如下错误:
Readiness probe failed: caliconode is not ready: BIRD is not ready: BGP not established with x.x.x.x
解决办法:ifconfig查看CentOS真实网卡接口名,一般以ens或enp开头!,修改IP自动发现方法。
ifconfig
vim calico.yaml
#搜索“k8s,bgp”,追加如下内容:
- name: IP_AUTODETECTION_METHOD
value: "interface=enp.*" # ens 根据实际网卡开头配置
#截取修改后的部分内容如下:
- name: CLUSTER_TYPE
value: 'k8s,bgp'
- name: IP_AUTODETECTION_METHOD
value: "interface=enp.*"
- name: IP
value: autodetect
- name: CALICO_IPV4POOL_IPIP
value: Always
kubectl apply -f calico.yaml
kubectl get pod --all-namespaces
四、安装kubernetes-dashboard
1.下载yaml文件并修改
wget https://raw.githubusercontent.com/kubernetes/dashboard/v2.0.0-rc7/aio/deploy/recommended.yaml
vim recommended.yaml
内容如下(截取修改部分):
---
kind: Service
apiVersion: v1
metadata:
labels:
k8s-app: kubernetes-dashboard
name: kubernetes-dashboard
namespace: kubernetes-dashboard
spec:
type: NodePort
ports:
- port: 443
targetPort: 8443
nodePort: 30443
selector:
k8s-app: kubernetes-dashboard
---
2.创建并启动服务
kubectl create -f recommended.yaml
kubectl get svc -n kubernetes-dashboard
web访问:
https://192.168.1.220:30443/
3.获取默认token
kubectl describe secrets -n kubernetes-dashboard kubernetes-dashboard | grep token | awk 'NR==3{print $2}'
eyJhbGciOiJSUzI1NiIsImtpZCI6ImZzLUJ3TS1LdGx1S0FCR3VWd1Z2SmlXSUlyalNzWlBITHo2WVlSQTl4Y0EifQ.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.BysUZfx9yHr4JT0oAIdarjndZLf2f9vjBlz9nyNtWoTUUYk_D-MbYfjFonWy5s1ZyIAfhFUB3Q89bXVbBA7L57eSO-K-zFwxiZPKOpJrmIC73FQYNWgkCWSAEC-0wn4-Z602wGll1EkL0AHLu8ntg8QoKH_ERS3rsouOvfaEXCc59QwwTet8gc2Kucx2YDdeP4wUOY5o67IoiNlHPglzxE-N98ifTircnbhJuvrIzX2ZuCKTkNtBIrnUQBriwBswcJjQPzwFBnHikeC7UcwB8JqqgbZ9koGOaNe8ywPTM3MFehr5RbLtKanGuaRFcG1KBU6FjalS4iYqNLlFawXh-A
在Web登录页面输入即可!右上角“小铃铛”会提示权限不足!
原因: 官方给的默认权限是最小的,所以我们要自建一个最大权限的SA
# 查看日志
kubectl get pods --all-namespaces
kubectl logs -f -n kubernetes-dashboard kubernetes-dashboard-5bc6d86cfd-7n99b
4.创建SA权限token
- 方法1:编辑yaml文件,apply使之生效
vim dashboard.yaml
# 内容如下
apiVersion: v1
kind: ServiceAccount
metadata:
name: dashboard
namespace: kubernetes-dashboard
---
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
name: dashboard
subjects:
- kind: ServiceAccount
name: dashboard
namespace: kubernetes-dashboard
roleRef:
kind: ClusterRole
name: cluster-admin
apiGroup: rbac.authorization.k8s.io
kubectl create -f dashboard.yaml
kubectl describe secrets -n kubernetes-dashboard dashboard | grep token | awk 'NR==3{print $2}'
eyJhbGciOiJSUzI1NiIsImtpZCI6ImZzLUJ3TS1LdGx1S0FCR3VWd1Z2SmlXSUlyalNzWlBITHo2WVlSQTl4Y0EifQ.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.BysUZfx9yHr4JT0oAIdarjndZLf2f9vjBlz9nyNtWoTUUYk_D-MbYfjFonWy5s1ZyIAfhFUB3Q89bXVbBA7L57eSO-K-zFwxiZPKOpJrmIC73FQYNWgkCWSAEC-0wn4-Z602wGll1EkL0AHLu8ntg8QoKH_ERS3rsouOvfaEXCc59QwwTet8gc2Kucx2YDdeP4wUOY5o67IoiNlHPglzxE-N98ifTircnbhJuvrIzX2ZuCKTkNtBIrnUQBriwBswcJjQPzwFBnHikeC7UcwB8JqqgbZ9koGOaNe8ywPTM3MFehr5RbLtKanGuaRFcG1KBU6FjalS4iYqNLlFawXh-A
- 方法2:通过kubectl create命令
kubectl create serviceaccount k8s-sa -n kubernetes-dashboard
kubectl create clusterrolebinding k8s-sa-cluster-admin --clusterrole=cluster-admin --serviceaccount=kubernetes-dashboard:k8s-sa
kubectl describe secrets -n kubernetes-dashboard dashboard | grep token | awk 'NR==3{print $2}'
使用新Token登录即可!
5.根据token创建登录config文件
secret=$(kubectl describe secrets -n kubernetes-dashboard k8s-sa | grep token | awk 'NR==3{print $2}')
echo $secret
kubectl config set-cluster kubernetes --server=192.168.1.220:6443 --kubeconfig=./k8s-sa.conf
kubectl config set-credentials k8s-sa --token="$secret" --kubeconfig=./k8s-sa.conf
kubectl config set-context k8s-sa@kubernetes --cluster=kubernetes --user=k8s-sa --kubeconfig=./k8s-sa.conf
kubectl config use-context k8s-sa@kubernetes --kubeconfig=./k8s-sa.conf
kubectl config view --kubeconfig=./k8s-sa.conf
使用config文件登录即可!
参考:
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