Краткое руководство по развертыванию приложений Java в OpenShift

Deployment configurations can be managed with the oc command like any other resource. You can create a new configuration or update the existing one by using the oc apply command.

$ oc apply -f account-deployment.yaml

You might be a little surprised, but this command does not trigger any build and does not start the pods. In fact, you have only created a resource of type deploymentConfig, which describes the deployment process. You can start this process using some other oc commands, but first, let’s take a closer look at the resources required by our application.

Injecting Environment Variables

As I have mentioned before, our sample applications use an external datasource. They need to open the connection to the existing MongoDB instance in order to store their data passed using HTTP endpoints exposed by the application. Here’s our MongoVerticle class, which is responsible for establishing a client connection with MongoDB. It uses environment variables for setting security credentials and a database name.

public class MongoVerticle extends AbstractVerticle {

    @Override
    public void start() throws Exception {
        ConfigStoreOptions envStore = new ConfigStoreOptions()
                .setType("env")
                .setConfig(new JsonObject().put("keys", new JsonArray().add("DATABASE_USER").add("DATABASE_PASSWORD").add("DATABASE_NAME")));
        ConfigRetrieverOptions options = new ConfigRetrieverOptions().addStore(envStore);
        ConfigRetriever retriever = ConfigRetriever.create(vertx, options);
        retriever.getConfig(r -> {
            String user = r.result().getString("DATABASE_USER");
            String password = r.result().getString("DATABASE_PASSWORD");
            String db = r.result().getString("DATABASE_NAME");
            JsonObject config = new JsonObject();
            config.put("connection_string", "mongodb://" + user + ":" + password + "@mongodb/" + db);
            final MongoClient client = MongoClient.createShared(vertx, config);
            final AccountRepository service = new AccountRepositoryImpl(client);
            ProxyHelper.registerService(AccountRepository.class, vertx, service, "account-service");
        });
    }

}

$ oc set env --from=secrets/mongodb dc/account-service

apiVersion: "v1"
kind: "ImageStream"
metadata:
  name: "account-vertx-service"
spec:
  dockerImageRepository: "piomin/account-vertx-service"

$ oc apply -f account-image.yaml

$ oc rollout latest dc/account-service
$ oc rollout latest dc/customer-service

$ oc whoami -t
Sz9_TXJQ2nyl4fYogR6freb3b0DGlJ133DVZx7-vMFM
$ docker login -u developer -p Sz9_TXJQ2nyl4fYogR6freb3b0DGlJ133DVZx7-vMFM https://172.30.1.1:5000

$ docker tag piomin/account-vertx-service 172.30.1.1:5000/sample-deployment/account-vertx-service:latest
$ docker push 172.30.1.1:5000/sample-deployment/account-vertx-service