[BAEL-4945] Using Namespaces and Selectors With the Kubernetes Java API (#10745)
* [BAEL-4863] Inicial code * [BAEL-4863] Article code * [BAEL-4945]
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psevestre
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apiVersion: v1
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kind: Namespace
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metadata:
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name: ns1
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---
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apiVersion: v1
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kind: Namespace
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metadata:
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name: ns2
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---
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apiVersion: apps/v1
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kind: Deployment
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metadata:
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name: httpd
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namespace: ns1
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labels:
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app: httpd
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version: "1"
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spec:
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replicas: 3
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selector:
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matchLabels:
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app: httpd
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template:
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metadata:
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labels:
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app: httpd
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spec:
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containers:
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- name: main
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image: httpd:alpine
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ports:
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- containerPort: 80
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---
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apiVersion: apps/v1
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kind: Deployment
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metadata:
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name: httpd
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namespace: ns2
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labels:
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app: httpd
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version: "2"
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foo: bar
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spec:
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replicas: 3
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selector:
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matchLabels:
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app: httpd
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template:
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metadata:
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labels:
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app: httpd
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spec:
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containers:
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- name: main
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image: httpd:alpine
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ports:
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- containerPort: 80
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/**
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*
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*/
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package com.baeldung.kubernetes.intro;
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import java.util.concurrent.TimeUnit;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import io.kubernetes.client.openapi.ApiClient;
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import io.kubernetes.client.openapi.apis.CoreV1Api;
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import io.kubernetes.client.openapi.models.V1NodeList;
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import io.kubernetes.client.openapi.models.V1PodList;
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import io.kubernetes.client.util.Config;
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import okhttp3.OkHttpClient;
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import okhttp3.logging.HttpLoggingInterceptor;
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/**
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* @author Philippe
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*
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*/
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public class ListPodsWithFieldSelectors {
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private static final Logger log = LoggerFactory.getLogger(ListPodsWithFieldSelectors.class);
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/**
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* @param args
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*/
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public static void main(String[] args) throws Exception {
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ApiClient client = Config.defaultClient();
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HttpLoggingInterceptor interceptor = new HttpLoggingInterceptor(message -> log.info(message));
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interceptor.setLevel(HttpLoggingInterceptor.Level.BODY);
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OkHttpClient newClient = client.getHttpClient()
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.newBuilder()
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.addInterceptor(interceptor)
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.readTimeout(0, TimeUnit.SECONDS)
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.build();
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client.setHttpClient(newClient);
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CoreV1Api api = new CoreV1Api(client);
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String fs = createSelector(args);
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V1PodList items = api.listPodForAllNamespaces(null, null, fs, null, null, null, null, null, 10, false);
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items.getItems()
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.stream()
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.map((pod) -> pod.getMetadata().getName() )
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.forEach((name) -> System.out.println("name=" + name));
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}
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private static String createSelector(String[] args) {
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StringBuilder b = new StringBuilder();
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for( int i = 0 ; i < args.length; i++ ) {
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if( b.length() > 0 ) {
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b.append(',');
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}
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b.append(args[i]);
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}
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return b.toString();
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}
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}
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/**
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*
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*/
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package com.baeldung.kubernetes.intro;
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import java.util.concurrent.TimeUnit;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import io.kubernetes.client.openapi.ApiClient;
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import io.kubernetes.client.openapi.apis.CoreV1Api;
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import io.kubernetes.client.openapi.models.V1NodeList;
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import io.kubernetes.client.openapi.models.V1PodList;
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import io.kubernetes.client.util.Config;
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import okhttp3.OkHttpClient;
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import okhttp3.logging.HttpLoggingInterceptor;
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/**
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* @author Philippe
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*
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*/
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public class ListPodsWithLabelSelectors {
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private static final Logger log = LoggerFactory.getLogger(ListPodsWithLabelSelectors.class);
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/**
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* @param args
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*/
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public static void main(String[] args) throws Exception {
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ApiClient client = Config.defaultClient();
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HttpLoggingInterceptor interceptor = new HttpLoggingInterceptor(message -> log.info(message));
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interceptor.setLevel(HttpLoggingInterceptor.Level.BODY);
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OkHttpClient newClient = client.getHttpClient()
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.newBuilder()
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.addInterceptor(interceptor)
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.readTimeout(0, TimeUnit.SECONDS)
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.build();
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client.setHttpClient(newClient);
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CoreV1Api api = new CoreV1Api(client);
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String selector = createSelector(args);
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V1PodList items = api.listPodForAllNamespaces(null, null, null, selector, null, null, null, null, 10, false);
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items.getItems()
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.stream()
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.map((pod) -> pod.getMetadata().getName() )
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.forEach((name) -> System.out.println("name=" + name));
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}
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private static String createSelector(String[] args) {
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StringBuilder b = new StringBuilder();
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for( int i = 0 ; i < args.length; i++ ) {
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if( b.length() > 0 ) {
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b.append(',');
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}
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b.append(args[i]);
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}
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return b.toString();
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}
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}
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@ -0,0 +1,52 @@
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/**
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*
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*/
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package com.baeldung.kubernetes.intro;
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import java.util.concurrent.TimeUnit;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import io.kubernetes.client.openapi.ApiClient;
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import io.kubernetes.client.openapi.apis.CoreV1Api;
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import io.kubernetes.client.openapi.models.V1NodeList;
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import io.kubernetes.client.openapi.models.V1PodList;
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import io.kubernetes.client.util.Config;
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import okhttp3.OkHttpClient;
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import okhttp3.logging.HttpLoggingInterceptor;
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/**
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* @author Philippe
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*
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*/
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public class ListPodsWithNamespaces {
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private static final Logger log = LoggerFactory.getLogger(ListPodsWithNamespaces.class);
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/**
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* @param args
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*/
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public static void main(String[] args) throws Exception {
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ApiClient client = Config.defaultClient();
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HttpLoggingInterceptor interceptor = new HttpLoggingInterceptor(message -> log.info(message));
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interceptor.setLevel(HttpLoggingInterceptor.Level.BODY);
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OkHttpClient newClient = client.getHttpClient()
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.newBuilder()
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.addInterceptor(interceptor)
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.readTimeout(0, TimeUnit.SECONDS)
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.build();
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client.setHttpClient(newClient);
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CoreV1Api api = new CoreV1Api(client);
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String namespace = "ns1";
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V1PodList items = api.listNamespacedPod(namespace,null, null, null, null, null, null, null, null, 10, false);
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items.getItems()
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.stream()
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.map((pod) -> pod.getMetadata().getName() )
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.forEach((name) -> System.out.println("name=" + name));
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}
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}
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package com.baeldung.kubernetes.intro;
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import org.junit.jupiter.api.Test;
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class ListPodsWithFieldSelectorsLiveTest {
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@Test
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void givenEqualitySelector_whenListPodsWithFieldSelectors_thenSuccess() throws Exception {
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ListPodsWithFieldSelectors.main(new String[] {
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"metadata.namespace=ns1"
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});
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}
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@Test
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void givenInequalitySelector_whenListPodsWithFieldSelectors_thenSuccess() throws Exception {
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ListPodsWithFieldSelectors.main(new String[] {
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"metadata.namespace!=ns1"
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});
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}
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@Test
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void givenChainedSelector_whenListPodsWithFieldSelectors_thenSuccess() throws Exception {
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ListPodsWithFieldSelectors.main(new String[] {
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"metadata.namespace=ns1",
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"status.phase=Running"
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});
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}
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}
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package com.baeldung.kubernetes.intro;
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import org.junit.jupiter.api.Test;
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class ListPodsWithLabelSelectorsLiveTest {
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@Test
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void givenEqualitySelector_whenListPodsWithLabelSelectors_thenSuccess() throws Exception {
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ListPodsWithLabelSelectors.main(new String[] {
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"app=httpd"
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});
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}
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@Test
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void givenInqualitySelector_whenListPodsWithLabelSelectors_thenSuccess() throws Exception {
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ListPodsWithLabelSelectors.main(new String[] {
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"app!=httpd"
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});
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}
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@Test
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void givenInSetSelector_whenListPodsWithLabelSelectors_thenSuccess() throws Exception {
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ListPodsWithLabelSelectors.main(new String[] {
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"app in (httpd,test)"
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});
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}
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@Test
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void givenNotInSetSelector_whenListPodsWithLabelSelectors_thenSuccess() throws Exception {
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ListPodsWithLabelSelectors.main(new String[] {
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"app notin (httpd)"
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});
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}
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@Test
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void givenLabelPresentSelector_whenListPodsWithLabelSelectors_thenSuccess() throws Exception {
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ListPodsWithLabelSelectors.main(new String[] {
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"app"
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});
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}
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@Test
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void givenLabelNotPresentSelector_whenListPodsWithLabelSelectors_thenSuccess() throws Exception {
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ListPodsWithLabelSelectors.main(new String[] {
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"!app"
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});
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}
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@Test
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void givenChainedSelector_whenListPodsWithLabelSelectors_thenSuccess() throws Exception {
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ListPodsWithLabelSelectors.main(new String[] {
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"app=httpd",
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"!foo"
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});
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}
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}
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