1 Introduction
There are two main ways to deploy K8s:
- 1、Cube admin
Kubeadm is a K8s deployment tool that provides kubeadm init and kubeadm join for rapid deployment of Kubernetes clusters.
- 2. Binary
Download the distribution's binary package from github, and manually deploy each component to form a Kubernetes cluster.
This article installs a kubernetes cluster on centos7 through kudeadm.
2. Environment preparation
(1) Initial configuration
# close the firewall
systemctl stop firewalld systemctl disable firewalld
# close selinux
sed -i 's/enforcing/disabled/' /etc/selinux/config
# close swap
Comment out the swap under /etc/fstab.
| 1 |
|
#Set the hostname
hostnamectl set-hostname k8s-node hostnamectl set-hostname k8s-master
#Add hosts in master
cat > /etc/hosts << EOF 192.168.44.137 k8s-node 192.168.44.138 k8s-master EOF
#Pass bridged IPV4 traffic to the chain of 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
# time synchronization
yum install ntpdate -y ntpdate time.windows.com
(2) Install Docker
wget http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo -O /etc/yum.repos.d/docker-ce.repo
yum -y install docker-ce
systemctl enable docker && systemctl start docker
#Configure mirror accelerator
sudo mkdir -p /etc/docker
sudo tee /etc/docker/daemon.json <<-'EOF'
{
"registry-mirrors": ["https://kd88kykb.mirror.aliyuncs.com"]
}
EOF
sudo systemctl daemon-reload
sudo systemctl restart docker
(3) Add Alibaba Cloud yum software source
cat > /etc/yum.repos.d/kubernetes.repo << EOF [kubernetes] name=Kubernetes baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/ enabled=1 gpgcheck=0 repo_gpgcheck=0 gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg EOF
(4) Install kubeadm, kubelet and kubectl
yum install -y kubelet-1.19.0 kubeadm-1.19.0 kubectl-1.19.0 systemctl enable kubelet
3. Deploy Kubernetes Master
| 1 2 3 4 5 6 |
|
Successful installation:
Use kubectl to view node status
4. Deploy the Node node
To add a new node to the cluster, execute the kubeadm join command.
kubeadm join 192.168.44.138:6443 --token 1g5b2s.sany5uo5w4op3hae \
--discovery-token-ca-cert-hash sha256:0fc38e874b727a9a4c2118e562a0b941dde98fa6ecc4ec2a6161b7d70a3966e2
journalctl -u kubelet
5. Deploy container network (CNI)
Find the calico corresponding to the k8s version
https://projectcalico.docs.tigera.io/archive/v3.20/getting-started/kubernetes/requirements
| 1 2 3 |
#Download calico.yaml, replace CALICO_IPV4POOL_CIDR<br>curl https://raw.githubusercontent.com/projectcalico/calico/v3.25.0/manifests/calico-etcd.yaml -o calico.yaml<br>
|
6. Test the kubernetes cluster
Create a pod in the cluster and verify that it is running:
kubectl create deployment nginx --image=nginx kubectl expose deployment nginx --port=80 --type=NodePort kubectl get pod,svc
http://192.168.44.138:31819/
http://192.168.44.137:31819/
7. Deploy Dashboard
Download and add type: NodePort
https://raw.githubusercontent.com/kubernetes/dashboard/v2.0.3/aio/deploy/recommended.yaml
kubectl apply -f recommended.yaml kubectl get pod,svc -n kubernetes-dashboard
Browser access:
Create a service account and bind the default cluster-admin administrator cluster role:
| 1 2 3 4 5 6 |
|
Use the token to log in to the dashboard.
Reprinted in: https://www.cnblogs.com/xiaozi/p/17110071.html