133 lines
3.0 KiB
Markdown
133 lines
3.0 KiB
Markdown
金丝雀发布又称为灰度发布。它能够缓慢的将修改推广到一小部分用户，验证没有问题后，再推广到全部用户，以降低生产环境引入新功能带来的风险。
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主要实现思想是SVC 通过标签 将生产流量逐步转发到新版本的POD中，不断扩容新版本Deployment的副本数，缩减旧版本的副本数
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## 工作负载概览
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| **工作负载** | **名称** | **标签** | **标签选择器** | **作用** |
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| --- | --- | --- | --- | --- |
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| service | web-service | 无 | app: nginx
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env: prod | 负载均衡，通过筛选pod 的标签进行流量转发 |
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| deployment | web-nginx-v1(旧版本，使用nginx1.14镜像)
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web-nginx-v2(新版本，使用nginx1.20镜像) | 随意，为方便管理，这里我们与下面的pod 的标签保持一致 | app: nginx
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env: prod
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release：v1（旧）
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release：v2（新） | 扩展管理、管理pod等 |
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| pod | web-nginx | app: nginx
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env: prod
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release：v1（旧）
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release：v2（新） | 无 | 管理容器，最小调度单位 |
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通过nginx 的版本进行验证，举个例子 svc 的Cluster IP为 1.1.1.1，那我们就通过curl 1.1.1.1/net 查看404 显示中的nginx版本，即可快速区分
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## YAML
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以下为详细yaml配置文件
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### SVC
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```yaml
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apiVersion: v1
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kind: Service
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metadata:
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name: web-service
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spec:
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selector:
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app: nginx
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env: prod
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ports:
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- protocol: TCP
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port: 80
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targetPort: 80
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```
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### 旧Deployment
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```yaml
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apiVersion: apps/v1
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kind: Deployment
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metadata:
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name: web-nginx-v1
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labels:
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app: nginx
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env: prod
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release: v1
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spec:
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replicas: 10
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selector:
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matchLabels:
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app: nginx
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env: prod
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release: v1
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template:
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metadata:
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labels:
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app: nginx
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env: prod
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release: v1
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spec:
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containers:
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- name: nginx
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image: nginx:1.14.2
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ports:
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- containerPort: 80
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```
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### 新Deplyment
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```yaml
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apiVersion: apps/v1
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kind: Deployment
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metadata:
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name: web-nginx-v2
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labels:
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app: nginx
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env: prod
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release: v2
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spec:
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replicas: 1
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selector:
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matchLabels:
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app: nginx
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env: prod
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release: v2
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template:
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metadata:
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labels:
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app: nginx
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env: prod
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release: v2
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spec:
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containers:
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- name: nginx
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image: nginx:1.20.1
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ports:
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- containerPort: 80
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```
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## 具体操作
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运行svc 和deployment
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```yaml
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kubectl apply -f canary-dp-old.yaml -f canary-svc.yaml
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```
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查看SVC的CLUSTER-IP
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```yaml
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kubectl get svc
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```
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查看运行状态并测试服务可用性
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```yaml
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kubectl get pod
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curl SVC的CLUSTER-IP/net
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```
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开始金丝雀部署
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```yaml
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kubectl apply -f canary-dp-new.yaml
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```
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查看运行状态，并测试金丝雀的服务情况
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```yaml
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kubectl get pod
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curl SVC的CLUSTER-IP/net
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```
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逐步扩容金丝雀的副本数量，减少v1版本的副本数量
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```yaml
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kubectl scale deployment web-nginx-v2 --replicas 数量（建议逐步加大）
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kubectl scale deployment web-nginx-v1 --replicas 数量（建议逐步减小）
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```
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