1. On k8s configuration information
- Secret()
Stored as encrypted data it can be used to store sensitive information, such as: OAuth tokens, private keys, passwords, database connection, the event bus connections, and so require secure storage of private data.
- configMap
The data stored in the form of plain text, can be used to hold some of the non-sensitive information, such as: configuration information of the application.
k8s provide for the Secret and ConfigMap four ways to create a (literal, files, environment files, yaml), in fact categorized view is created in two ways, literal and files.
1.1 How injected into the micro-service application?
k8s already provides two ways for us, that is injected through the storage volume (volume) and the way the environment variables to the micro-service applications.
2, the real purpose
Environmentally variables will k8s ConfigMap in the application configuration information stored in the micro-injected into the service. This is Microsoft's micro Services sample application (eshopOnContainer) methods used. Otherwise, I hope you go on your own combat.
3, the preparation of the resource file yaml
ConfigMap resource file, appsetting.yml as follows:
Above the red mark of what we need to configure the information injection.
hello-world-deployment-with-settings.yml如下：
4. Create a resource object k8s
By dashboard view the cluster profile, Deployment resource object as follows:
ConfigMap resource object as follows:
5, run the micro-service check injection results
Can be seen from the above, the injection success! ! !
6, Postscript
When we use the micro-service architecture to develop our application, how to manage these huge configuration information? How to achieve non-stop dynamic information to the micro-injection service? How to use configuration information and data storage mechanism k8s to decouple the configuration information with the micro-service applications? Stay tuned, we will examine each combat.
Next, we will combat how to make micro-aware service applications dynamically change the configuration information k8s management.
源码参考：https://github.com/justmine66/k8s.ecoysystem.apps