[K8s] kubeadm rapid deployment Kubernetes

1.Kubernetes Chart

2.Kubernetes environment ready

1⃣️ turn off the firewall:

systemctl stop firewalld && systemctl disable firewalld

2⃣️ close selinux:

sed -i 's/enforcing/disabled/' /etc/selinux/config 
setenforce 0

3⃣️ closed swap:

#临时
swapoff -a  
#永久关闭swap分区
sudo sed -ri 's/.*swap.*/#&/' /etc/fstab

4⃣️ add the host name and IP correspondence relationship (remember to set the host name):

cat /etc/hosts
10.211.55.3 k8s-master 
10.211.55.4 k8s-node1
10.211.55.6 k8s-node2
10.211.55.7 k8s-node3

5⃣️ IPv4 traffic will be passed to the bridging chain iptables:

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

3. All nodes installed Docker / kubeadm / kubelet

Kubernetes default CRI (container runtime) is Docker, therefore install Docker.
1⃣️ installation Docker:

sudo su
wget https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo -O /etc/yum.repos.d/docker-ce.repo
yum -y install docker-ce-18.06.1.ce-3.el7
systemctl enable docker && systemctl start docker
docker --version

Ali cloud 2⃣️ add YUM repositories:

[root@k8s-master yum.repos.d]# cat /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.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg

3⃣️ installation kubeadm, kubelet and kubectl

yum install -y kubelet kubeadm kubectl
systemctl enable kubelet && systemctl start kubelet

4. department Kubernetes Master

1⃣️ Since the default image address k8s.gcr.io pull the country inaccessible, specify the address of the warehouse Ali cloud mirrored here.

kubeadm init --apiserver-advertise-address=10.211.55.3 --image-repository registry.aliyuncs.com/google_containers --service-cidr=10.1.0.0/16 --pod-network-cidr=10.244.0.0/16

After executing init:

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 10.211.55.3:6443 --token eehcsb.r8tnvj7ov436x63q \
    --discovery-token-ca-cert-hash sha256:583f343b5d55ff96c5a83ccc82444de3c0313adf135d8a980507932aa2f51e1d 

If an error occurs, execute:

 kubeadm reset
#kubeadm详细用法可查看kubeadm --help

2⃣️ use kubectl tools:

[root@k8s-master yum.repos.d]# mkdir -p $HOME/.kube
[root@k8s-master yum.repos.d]# sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
[root@k8s-master yum.repos.d]# sudo chown $(id -u):$(id -g) $HOME/.kube/config
[root@k8s-master yum.repos.d]# kubectl get nodes
NAME         STATUS     ROLES    AGE     VERSION
k8s-master   NotReady   master   8m33s   v1.17.0

In addition, we also need to be prompted to create a network and allow other nodes to perform kubeadm join ... join the cluster.

5. Create Network

If you do not create your network, view the status pod, you can see kube-dns component is blocked, unavailable when the cluster:

[root@k8s-master yum.repos.d]# kubectl get pod -n kube-system
NAME                                 READY   STATUS    RESTARTS   AGE
coredns-9d85f5447-n9kkd              0/1     Pending   0          25m
coredns-9d85f5447-s9ms2              0/1     Pending   0          25m
etcd-k8s-master                      1/1     Running   0          25m
kube-apiserver-k8s-master            1/1     Running   0          25m
kube-controller-manager-k8s-master   1/1     Running   0          25m
kube-proxy-94wtc                     1/1     Running   0          5m41s
kube-proxy-h8q8h                     1/1     Running   0          5m45s
kube-proxy-kxmxt                     1/1     Running   0          25m
kube-proxy-nxtpq                     1/1     Running   0          5m44s
kube-scheduler-k8s-master            1/1     Running   0          25m

Create a network problem, unfinished, and then update to address tomorrow ...