#云原生征文#kubeadm部署一主两从的kubernetes集群 原创 精华

swapoff -a
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vim /etc/fstab
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wget https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo -O /etc/yum.repos.d/docker-ce.repo
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yum list docker-ce --showduplicates
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yum install --setopt=obsoletes=0 docker-ce-18.06.3.ce-3.el7 -y
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mkdir /etc/docker

cat <<EOF > /etc/docker/daemon.json
{
"exec-opts": ["native.cgroupdriver=systemd"],
"registry-mirrors": ["https://kn0t2bca.mirror.aliyuncs.com"]
}
EOF
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systemctl restart docker
systemctl enable docker
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vim /etc/yum.repos.d/kubernetes.repo

[kubernetes]
name=Kubernetes
baseurl=http://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=0
repo_gpgcheck=0
gpgkey=http://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg
       http://mirrors.aliyum.com/kubernetes/yum/doc/rpm-package-key.gpg
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yum install --setopt=obsoletes=0 kubeadm-1.23.6-0 kubelet-1.23.6-0 kubectl-1.23.6-0 -y
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vim /etc/sysconfig/kubelet

KUBELET_CGROUP_ARGS="--cgroup-driver=systemd"
KUBE_PROXY_MODE="ipvs"
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systemctl enable kubelet
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vim ima.sh
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images=(
    kube-apiserver:v1.23.6
    kube-controller-manager:v1.23.6
    kube-scheduler:v1.23.6
    kube-proxy:v1.23.6
    pause:3.6
    etcd:3.5.1-0
    coredns:v1.8.6
)
 
for list in ${images[@]} ; do
    docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/$list
    docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/$list k8s.gcr.io/$list
done
docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/coredns:v1.8.6 k8s.gcr.io/coredns/coredns:v1.8.6
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sh ima.sh
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kubeadm init \
	--kubernetes-version=v1.23.6 \
	--pod-network-cidr=10.0.0.0/16 \
	--service-cidr=10.0.0.0/12 \
	--apiserver-advertise-address=172.20.10.6
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mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
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kubeadm token create --print-join-command
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kubectl get nodes
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git clone https://github.com/coredns/deployment.git
yum -y install epel-release
yum -y install jq

cd deployment/kubernetes/
./deploy.sh -i 10.0.0.254 > coredns.yaml
kubectl apply -f coredns.yaml
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kubectl get pod,svc -A
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kubectl describe pod coredns-799bc9dbc6-m7q4t -n kube-system
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kubectl get pod,svc -A
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wget https://raw.githubusercontent.com/kubernetes/dashboard/v2.4.0/aio/deploy/recommended.yaml
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vim recommended.yaml
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kubectl apply -f recommended.yaml
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kubectl get pods -n kubernetes-dashboard
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kubectl create serviceaccount dashboard-admin -n kube-system
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kubectl create clusterrolebinding dashboard-admin --clusterrole=cluster-admin --serviceaccount=kube-system:dashboard-admin
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kubectl describe secrets -n kube-system $(kubectl -n kube-system get secret | awk '/dashboard-admin/{print $1}')
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vim nginx-namespace.yaml

内容如下
apiVersion: v1 #类型为Namespace
kind: Namespace  #类型为Namespace
metadata:
  name: ns-test  #命名空间名称
  labels:
    name: label-test  #pod标签
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[root@pg01 ~]# kubectl create -f nginx-namespace.yaml
namespace/ns-test created
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[root@pg01 ~]# kubectl get namespace
NAME                   STATUS   AGE
default                Active   92m
kube-node-lease        Active   92m
kube-public            Active   92m
kube-system            Active   92m
kubernetes-dashboard   Active   21m
ns-test                Active   5s
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docker pull nginx
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vim nginx-deployment.yaml
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apiVersion: apps/v1
kind: Deployment
metadata:
  namespace: ns-test
  name: nginx-deployment
spec:
  selector:
    matchLabels:
      app: nginx
  replicas: 2
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:latest
        ports:
        - containerPort: 80
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kubectl create -f nginx-deployment.yaml
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kubectl get pods -n ns-test
kubectl get deployment  -n ns-test
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kubectl get pods -o wide -n ns-test
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curl http://10.0.181.5
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vim nginx-service.yaml
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apiVersion: v1
kind: Service
metadata:
  namespace: ns-test
  name: nginx-service
spec:
  selector:
    app: nginx
  ports:
  - protocol: TCP
    port: 80
    targetPort: 80
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kubectl create -f nginx-service.yaml	
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kubectl get svc nginx-service -o wide  -n ns-tes
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apiVersion: v1
kind: Service
metadata:
  labels:
   app: nginx
  name: nginx-service
  namespace: ns-test
spec:
  ports:
  - port: 9000
    name: nginx-service
    protocol: TCP
    targetPort: 80 # 容器nginx对外开放的端口 上面的dm已经指定了
    nodePort: 31090 #外网访问的端口
  selector:
    app: nginx
  type: NodePort
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kubectl create -f nginx-service.yaml
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kubectl get svc nginx-service -n ns-test
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