整个K8S演练步骤可以分为几个关键步骤,下面是整个流程的步骤概要:
| 步骤 | 操作 |
|-------------------------|---------------------------------------------|
| 步骤一:搭建K8S集群 | 在本地或云端搭建K8S集群 |
| 步骤二:创建Deployment | 创建一个简单的Deployment来部署应用程序 |
| 步骤三:扩展Deployment | 扩展Deployment,测试节点水平扩展的效果 |
| 步骤四:滚动更新Deployment | 修改Deployment镜像版本,观察滚动更新的过程 |
| 步骤五:清理资源 | 删除创建的Deployment和其他资源 |
现在让我们逐步来介绍每个步骤需要做什么,以及需要使用的代码示例来实现。
### 步骤一:搭建K8S集群
1. 安装Minikube(用于在本地快速搭建K8S集群)
```shell
brew install minikube
```
2. 启动Minikube集群
```shell
minikube start
```
### 步骤二:创建Deployment
1. 创建一个简单的Deployment YAML 文件(如`myapp-deployment.yaml`),用于部署应用程序:
```yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: myapp-deployment
spec:
replicas: 3
selector:
matchLabels:
app: myapp
template:
metadata:
labels:
app: myapp
spec:
containers:
- name: myapp
image: nginx:latest
ports:
- containerPort: 80
```
2. 使用kubectl命令部署Deployment
```shell
kubectl apply -f myapp-deployment.yaml
```
### 步骤三:扩展Deployment
1. 修改Deployment YAML 文件,将replicas字段修改为5:
```yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: myapp-deployment
spec:
replicas: 5
...
```
2. 使用kubectl命令更新Deployment
```shell
kubectl apply -f myapp-deployment.yaml
```
### 步骤四:滚动更新Deployment
1. 修改Deployment的镜像版本,并保存为新的YAML文件`myapp-deployment-v2.yaml`:
```yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: myapp-deployment
spec:
...
containers:
- name: myapp
image: nginx:1.19
...
```
2. 使用kubectl命令进行滚动更新
```shell
kubectl apply -f myapp-deployment-v2.yaml
```
### 步骤五:清理资源
1. 删除Deployment
```shell
kubectl delete deployment myapp-deployment
```
2. 停止Minikube集群
```shell
minikube stop
```
通过以上步骤的演练,你已经学会了如何搭建K8S集群,创建Deployment,扩展Deployment,以及进行滚动更新。希望这篇文章可以帮助你快速入门K8S的基本操作流程,加油!