Go微服務(wù)架構(gòu)實(shí)戰(zhàn)-【公粽號：堆棧future】
Go微服務(wù)架構(gòu)實(shí)戰(zhàn)目錄
1. 微服務(wù)架構(gòu)上篇
1. grpc技術(shù)介紹
2. grpc+protobuf+網(wǎng)關(guān)實(shí)戰(zhàn)
3. etcd技術(shù)介紹
4. 基于etcd的服務(wù)發(fā)現(xiàn)與注冊
5. 基于etcd的分布式鎖實(shí)戰(zhàn)
2. 微服務(wù)架構(gòu)中篇
基于k8s的Deployment工作負(fù)載
主要是利用Deployment資源對象實(shí)現(xiàn)的面哼，包括一下功能：
- 多副本集
- 擴(kuò)縮容
- 自愈和故障轉(zhuǎn)移
- 滾動更新
- 回退能力
接下來詳細(xì)了解下操作過程
1. 多副本集
deploy.yaml中只需修改一下replicas政敢，讓它的值變成我們想要的副本數(shù)量。
<pre data-tool="mdnice編輯器" style="box-sizing: border-box !important; margin: 10px 0px; padding: 0px; outline: 0px; font-family: SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace; font-size: 14px; overflow: auto; display: block; color: rgb(33, 37, 41); max-width: 100%; overflow-wrap: break-word !important; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: 0.8px; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0.8px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; border-radius: 5px; box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;">apiVersion: apps/v1 kind: Deployment metadata: name: k8sdemo-deploy labels: app: k8sdemo spec: replicas: 3 //修改這里 selector: matchLabels: app: k8sdemo template: metadata: labels: app: k8sdemo spec: containers: - name: k8sdemo image: k8s-grpc-demo:latest imagePullPolicy: Never ports: - containerPort: 50007 </pre>
然后kubectl apply -f deploy.yaml應(yīng)用一下就可以了，看下創(chuàng)建結(jié)果：
從結(jié)果看出三個(gè)pod成功起來了。
2. 擴(kuò)縮容
比較簡單，一行命令搞定：
kubectl scale --replicas=1 deployment/k8sdemo-deploy回車之后打印如下：
然后看下pod數(shù)量kubectl get pod發(fā)現(xiàn)只有一個(gè)pod了，這里就不展示了职祷，非常簡單痰催。
3. 自愈和故障轉(zhuǎn)移
因?yàn)槲抑挥幸慌_機(jī)器胎食，沒辦法驗(yàn)證扰才，所以只列出步驟，下去大家自己可以嘗試厕怜。
- 停某一臺機(jī)器
- 刪除某個(gè)pod
大家可以去試試衩匣，看看是否停掉機(jī)器之后，pod會在別的機(jī)器上再起來粥航，保持Deployment的副本集數(shù)量不變琅捏。或者在某臺機(jī)器上刪除某個(gè)pod之后递雀，看看這個(gè)pod是否重新建立(歸功于Deployment的能力)柄延。
tips：當(dāng)你要?jiǎng)h除pod的時(shí)候發(fā)現(xiàn)一直刪除不掉，pod會自動起來缀程，不要著急莫慌搜吧，你應(yīng)該先刪除Deployment，這樣pod就會自動刪除的杨凑。
4. 滾動更新
首先你基于你的代碼做了部分更新滤奈，比如增加了日志等功能，然后在本地構(gòu)建鏡像撩满，比如k8s-grpc-demo:v2蜒程，然后你用一行命令就可以搞定滾動更新：
<pre data-tool="mdnice編輯器" style="box-sizing: border-box !important; margin: 10px 0px; padding: 0px; outline: 0px; font-family: SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace; font-size: 14px; overflow: auto; display: block; color: rgb(33, 37, 41); max-width: 100%; overflow-wrap: break-word !important; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: 0.8px; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0.8px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; border-radius: 5px; box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;">kubectl set image deployment/k8sdemo-deploy k8s-grpc-demo=k8s-grpc-demo:v2 --record </pre>
查看下更新狀態(tài)
<pre data-tool="mdnice編輯器" style="box-sizing: border-box !important; margin: 10px 0px; padding: 0px; outline: 0px; font-family: SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace; font-size: 14px; overflow: auto; display: block; color: rgb(33, 37, 41); max-width: 100%; overflow-wrap: break-word !important; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: 0.8px; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0.8px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; border-radius: 5px; box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;">kubectl rollout status deployment/k8sdemo-deploy </pre>
5. 回退能力
- 查看歷史版本記錄
<pre data-tool="mdnice編輯器" style="box-sizing: border-box !important; margin: 10px 0px; padding: 0px; outline: 0px; font-family: SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace; font-size: 14px; overflow: auto; display: block; color: rgb(33, 37, 41); max-width: 100%; overflow-wrap: break-word !important; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: 0.8px; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0.8px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; border-radius: 5px; box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;">kubectl rollout history deployment/k8sdemo-deploy </pre>
- 查看某個(gè)歷史詳情
<pre data-tool="mdnice編輯器" style="box-sizing: border-box !important; margin: 10px 0px; padding: 0px; outline: 0px; font-family: SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace; font-size: 14px; overflow: auto; display: block; color: rgb(33, 37, 41); max-width: 100%; overflow-wrap: break-word !important; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: 0.8px; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0.8px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; border-radius: 5px; box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;">kubectl rollout history deployment/k8sdemo-deploy --revision=2 </pre>
- 回滾(回到上次)
<pre data-tool="mdnice編輯器" style="box-sizing: border-box !important; margin: 10px 0px; padding: 0px; outline: 0px; font-family: SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace; font-size: 14px; overflow: auto; display: block; color: rgb(33, 37, 41); max-width: 100%; overflow-wrap: break-word !important; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: 0.8px; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0.8px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; border-radius: 5px; box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;">kubectl rollout undo deployment/k8sdemo-deploy </pre>
- 回滾(回到指定版本)
<pre data-tool="mdnice編輯器" style="box-sizing: border-box !important; margin: 10px 0px; padding: 0px; outline: 0px; font-family: SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace; font-size: 14px; overflow: auto; display: block; color: rgb(33, 37, 41); max-width: 100%; overflow-wrap: break-word !important; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: 0.8px; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0.8px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; border-radius: 5px; box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;">kubectl rollout undo deploymen/k8sdemo-deploy --to-revision=2 </pre>
6. 小結(jié)
其實(shí)k8s使用不是很復(fù)雜，你可以學(xué)完k8s之后搭建自己的服務(wù)伺帘，但是如果想深入定制k8s昭躺，需要有一定golang知識和容器化知識，所以想要進(jìn)階的可以在深入學(xué)習(xí)下源碼理解下原理曼追。
下篇文章繼續(xù)給大家講解下k8s的service的服務(wù)注冊和發(fā)現(xiàn)能力和ingress的入口網(wǎng)關(guān)能力窍仰，以及它們的網(wǎng)絡(luò)架構(gòu)知識。喜歡這篇文章的童鞋可以關(guān)注礼殊，轉(zhuǎn)發(fā)和分享哈驹吮。
github地址：https://github.com/guojiangli/k8s-grpc-demo
【公粽號：堆棧future】
