如何在Kubernetes上使用Redis部署Node.js? [英] How to deploy a node.js with redis on kubernetes?
问题描述
我有一个非常简单的node.js应用程序(HTTP服务),可与redis对话".我想创建一个部署并使用minikube运行它.
I have a very simple node.js application (HTTP service), which "talks" to redis. I want to create a deployment and run it with minikube.
根据我的理解,我需要基于docker镜像的我的应用程序的kubernetes Pod.这是我的Dockerfile:
From my understanding, I need a kubernetes Pod for my app, based on the docker image. Here's my Dockerfile:
FROM node:8.9.1
WORKDIR /usr/src/app
COPY package*.json ./
RUN npm install
COPY . .
EXPOSE 8080
CMD ["npm", "start"]
我用docker build -t my-app .
接下来,我为应用程序的Pod创建了Pod定义:
Next, I created a Pod definition for my app's Pod:
apiVersion: v1
kind: Pod
metadata:
name: my-app
spec:
containers:
- name: my-app
image: my-app:latest
imagePullPolicy: Never
ports:
- containerPort: 8080
到目前为止,太好了.但是从现在开始,我还不清楚如何进行Redis:
So far, so good. But from now on, I have no clear idea how to proceed with redis:
-
应该重新使用另一个Pod还是服务(就Kubernetes而言)?
should redis be another Pod, or a Service (in terms of Kubernetes kind)?
如何从我的应用程序内部引用Redis?根据是否将Redis定义为Pod/服务,如何获取连接URL和端口?我读到有关Kubernetes正在创建的环境变量的信息,但是我不确定这些变量是否适用于Pod或Services.
How do I reference redis from inside my app? Based on whether redis will be defined as a Pod/Service, how do I obtain a connection URL and port? I read about environment variables being created by Kubernetes, but I am not sure whether these work for Pods or Services.
如何在单一配置下同时汇总这两个(我的应用程序和Redis)?如何确保Redis首先启动,然后确保我的应用程序启动(需要运行Redis实例),以及如何将HTTP端点暴露给外部世界"?我读过有关部署的文章,但不确定如何将这些部分连接在一起.
How do I aggregate both (my app & redis) under single configuration? How do I make sure that redis starts first, then my app (which requires running redis instance), and how do I expose my HTTP endpoints to the "outside world"? I read about Deployments, but I am not sure how to connect these pieces together.
理想情况下,我希望将所有配置都包含在YAML文件中,以便最终可以通过单个命令启动整个基础架构.
Ideally, I would like to have all configurations inside YAML files, so that at the end of the day the whole infrastructure could be started with a single command.
推荐答案
我同意所有前面的答案.我只是想通过执行一个命令来使事情变得更简单.
I agree with all of the previous answers. I'm just trying to things more simple by executing a single command.
首先,在名为redis.yaml
的文件中为redis创建必要的清单,并进行服务以将其公开到外部.
First, create necessary manifests for redis in a file say redis.yaml
and service to expose it outside.
apiVersion: v1
kind: Service
metadata:
name: redis
labels:
app: node-redis
spec:
ports:
- name: redis
port: 6379
targetPort: 6379
type: NodePort
selector:
app: node-redis
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: redis
spec:
selector:
matchLabels:
app: node-redis
replicas: 1
template:
metadata:
labels:
app: node-redis
spec:
containers:
- name: redis
image: redis:latest
imagePullPolicy: IfNotPresent
ports:
- containerPort: 6379
# data volume where redis writes data
volumeMounts:
- name: data
mountPath: /data
readOnly: false
volumes:
- name: data
persistentVolumeClaim:
claimName: redis-data
---
# data volume
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: redis-data
labels:
app: node-redis
spec:
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 100Mi
接下来,将您应用的清单放在另一个文件中,例如my-app.yaml
.在这里,我放置了音量字段,以便您可以使用redis存储的数据.
Next put manifests for your app in another file say my-app.yaml
. Here i put the volume field so that you can use the data that stored by redis.
apiVersion: v1
kind: Pod
metadata:
name: my-app
labels:
app: node-redis
spec:
containers:
- name: my-app
image: my-app:latest
ports:
- containerPort: 8080
# data volume from where my-app read data those are written by redis
volumeMounts:
- name: data
mountPath: /data
readOnly: false
volumes:
- name: data
persistentVolumeClaim:
claimName: redis-data
现在我们可以使用以下bash文件my-app.sh
.
Now we can use the following bash file my-app.sh
.
#!/bin/bash
kubectl create -f redis.yaml
pod_name=$(kubectl get po -l app=node-redis | grep app-with-redis | awk '{print $1}')
# check whether redis server is ready or not
while true; do
pong=$(kubectl exec -it $pod_name -c redis redis-cli ping)
if [[ "$pong" == *"PONG"* ]]; then
echo ok;
break
fi
done
kubectl create -f my-app.yaml
只需运行chmod +x my-app.sh; ./my-app.sh
进行部署.要获取URL,请运行minikube service redis --url
.您可以类似地获取应用程序的URL.唯一的事情是您需要为应用程序提供nodePort
类型的服务,以便从群集外部访问它.
Just run chmod +x my-app.sh; ./my-app.sh
to deploy. To get the url run minikube service redis --url
. You can similarly get the url for your app. The only thing is you need a nodePort
type service for your app to access it from outside of the cluster.
所以,现在一切都在您手中.
So, everything is in your hand now.
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