在CentOS上部署Kubernetes集群并部署应用通常涉及以下步骤:
systemctl stop firewalld
systemctl disable firewalld
sed -i 's/enforcing/disabled/' /etc/selinux/config
setenforce 0
swapoff -a
sed -ri 's/.*swap.*/#&/' /etc/fstab
hostnamectl set-hostname <hostname>
cat >> /etc/hosts << EOF
<master-ip> <master-hostname>
<node1-ip> <node1-hostname>
<node2-ip> <node2-hostname>
EOF
cat > /etc/sysctl.d/k8s.conf << EOF
net.bridge.bridge-nf-call-iptables = 1
net.ipv4.ip_forward = 1
EOF
sysctl --system
yum install ntpdate -y
ntpdate time.windows.com
cat > /etc/yum.repos.d/docker-ce.repo << EOF
[docker-ce]
name=Docker CE
baseurl=https://mirrors.aliyun.com/docker-ce/linux/centos/$releasever/
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://mirrors.aliyun.com/docker-ce/linux/centos/gpg
EOF
yum install -y docker-ce
systemctl start docker
systemctl enable docker
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=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 install -y kubelet kubeadm kubectl
systemctl enable kubelet
systemctl start kubelet
kubeadm init --apiserver-advertise-address=<master-ip> --image-repository registry.aliyuncs.com/google_containers --kubernetes-version v1.23.0 --service-cidr=10.96.0.0/12 --pod-network-cidr=10.244.0.0/16
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
在Master节点生成的命令复制到每个Worker节点并执行。
例如,部署Tomcat应用的tomcat.yaml
:
apiVersion: apps/v1
kind: Deployment
metadata:
name: myweb
spec:
selector:
matchLabels:
app: myweb
replicas: 2
template:
metadata:
labels:
app: myweb
spec:
containers:
- name: myweb
image: docker.io/tomcat:latest
ports:
- containerPort: 8080
---
apiVersion: v1
kind: Service
metadata:
name: myweb
spec:
ports:
- port: 8099
targetPort: 8080
selector:
app: myweb
type: NodePort
kubectl apply -f tomcat.yaml
kubectl get pods