[英]Kubectl deployment - how to load env vars from JSON file
I'm using kubectl to deploy ASP.Net core apps to K8S cluster.我正在使用 kubectl 将 ASP.Net 核心应用程序部署到 K8S 集群。 At the current moment I hardcode container PORTs and ConnectionString for DataBase like this:
目前,我对数据库的容器端口和 ConnectionString 进行硬编码,如下所示:
apiVersion: apps/v1
kind: Deployment
metadata:
name: mydeploy
spec:
replicas: 1
selector:
matchLabels:
app: mydeploy
template:
metadata:
labels:
app: mydeploy
spec:
containers:
- name: mydeploy
image: harbor.com/my_app:latest
env:
- name: MyApp__ConnectionString
value: "Host=postgres-ap-svc;Port=5432;Database=db;Username=postgres;Password=password"
ports:
- containerPort: 5076
But the good solution I think - to use such variables from appsettings.json
file (ASP.Net config file).但我认为好的解决方案 - 使用
appsettings.json
文件(ASP.Net 配置文件)中的此类变量。 So my question - How to load this vars from JSON file and use in yaml file?所以我的问题 - 如何从 JSON 文件加载这个变量并在 yaml 文件中使用?
JSON file is like this: JSON 文件是这样的:
{
"MyApp": {
"ConnectionString": "Host=postgres-ap-svc;Port=5432;Database=db;Username=postgres;Password=password"
},
"ClientBaseUrls": {
"MyApp": "http://mydeploy-svc:5076/api",
}
}
You can use following command to create configmap and then mount it to your contianer您可以使用以下命令创建 configmap,然后将其挂载到您的 contianer
kubectl create configmap appsettings --from-file=appsettings.json --dry-run -o yaml
For mounting you should add a volume to your deployment or sts like this:对于安装,您应该向部署或 sts 添加一个卷,如下所示:
volumes:
- name: config
configMap:
name: appsettings
And then mount it to your container:然后将其安装到您的容器中:
volumeMounts:
- mountPath: /appropriate/path/to/config/appsettings.json
subPath: appsettings.json
name: config
Also if you want you can use the config map as your environment variables source like this:此外,如果您愿意,可以使用配置 map 作为环境变量源,如下所示:
envFrom:
- configMapRef:
name: config
I'm putting all the comments as a community wiki answer for better usability.为了更好的可用性,我将所有评论作为社区 wiki 答案。
If you run printenv
in a container and see:如果您在容器中运行
printenv
并查看:
appsettings.json={ "MyApp": { "ConnectionString": "Host=postgres-ap-svc;Port=5432;Database=db;Username=postgres;Password=password" }, "ClientBaseUrls": { "MyApp": "http://mydeploy-svc:5076/api", } }
instead of something like: "MyApp__ConnectionString":"..."
and "ClientBaseUrls__MyApp":"..."
而不是类似:
"MyApp__ConnectionString":"..."
和"ClientBaseUrls__MyApp":"..."
you should create the configmap using --from-env-file
option instead.您应该使用
--from-env-file
选项创建配置映射。
For example: kubectl create configmap appsettings --from-env-file=appsettings.json --dry-run -o yaml
And use envFrom
like mentioned in the post kubernetes.io/docs/tasks/configure-pod-container/ . For example:
kubectl create configmap appsettings --from-env-file=appsettings.json --dry-run -o yaml
And use envFrom
like mentioned in the post kubernetes.io/docs/tasks/configure-pod-container/ .
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