⚗️ Installing kubectl inside container

Dockerfile

@@ -78,20 +78,36 @@
 #   accessed directly. (example: "foo.example.com,bar.example.com")
 #
 ###
-FROM registry.access.redhat.com/ubi9/openjdk-21:1.21
+FROM eclipse-temurin:21-jdk
 
 ENV LANGUAGE='en_US:en'
 
+WORKDIR /root
+
+RUN apt-get update && \
+    apt-get install -y apt-transport-https ca-certificates curl gnupg && \
+    curl -fsSL https://pkgs.k8s.io/core:/stable:/v1.33/deb/Release.key | gpg --dearmor -o /etc/apt/keyrings/kubernetes-apt-keyring.gpg && \
+    chmod 644 /etc/apt/keyrings/kubernetes-apt-keyring.gpg && \
+    echo 'deb [signed-by=/etc/apt/keyrings/kubernetes-apt-keyring.gpg] https://pkgs.k8s.io/core:/stable:/v1.33/deb/ /' | tee /etc/apt/sources.list.d/kubernetes.list && \
+    chmod 644 /etc/apt/sources.list.d/kubernetes.list && \
+    apt-get update && \
+    apt-get install -y kubectl
+
+RUN useradd -m quarkus
+
+WORKDIR /etc/build
 
 # We make four distinct layers so if there are application changes the library layers can be re-used
-COPY --chown=185 target/quarkus-app/lib/ /deployments/lib/
+COPY target/quarkus-app/lib/ /deployments/lib/
-COPY --chown=185 target/quarkus-app/*.jar /deployments/
+COPY target/quarkus-app/*.jar /deployments/
-COPY --chown=185 target/quarkus-app/app/ /deployments/app/
+COPY target/quarkus-app/app/ /deployments/app/
-COPY --chown=185 target/quarkus-app/quarkus/ /deployments/quarkus/
+COPY target/quarkus-app/quarkus/ /deployments/quarkus/
 
 EXPOSE 8080
-USER 185
+
-ENV JAVA_OPTS_APPEND="-Dquarkus.http.host=0.0.0.0 -Djava.util.logging.manager=org.jboss.logmanager.LogManager"
+USER quarkus
+
+ENV JAVA_OPTS_APPEND="-Dquarkus.http.host=0.0.0.0"
 ENV JAVA_APP_JAR="/deployments/quarkus-run.jar"
 
-ENTRYPOINT [ "/opt/jboss/container/java/run/run-java.sh" ]
+CMD ["java","-jar","/deployments/quarkus-run.jar"]

src/main/java/dev/dinauer/NodeResource.java

@@ -12,6 +12,8 @@ import jakarta.ws.rs.GET;
 import jakarta.ws.rs.Path;
 import jakarta.ws.rs.Produces;
 import jakarta.ws.rs.core.MediaType;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.io.BufferedReader;
 import java.io.IOException;
@@ -24,6 +26,8 @@ import java.util.List;
 @Authenticated
 public class NodeResource
 {
+    private static final Logger LOG = LoggerFactory.getLogger(NodeResource.class);
+
     @Inject
     ClientProvider clientProvider;
 
@@ -34,6 +38,7 @@ public class NodeResource
         List<NodeStats> result = new ArrayList<>();
 
         List<String> stats = getTopNodes();
+
         for(String nodeName : stats)
         {
             String[] parts = nodeName.split("\\s+");
@@ -53,7 +58,9 @@ public class NodeResource
 
     private List<String> getTopNodes() throws IOException, InterruptedException
     {
-        ProcessBuilder pb = new ProcessBuilder(List.of("kubectl", "top", "nodes", "--no-headers"));
+        List<String> commands = List.of("kubectl", String.format("--kubeconfig=%s", clientProvider.pathToKubeconfig()), "top", "nodes", "--no-headers");
+        LOG.info("Executing command: {}", String.join(" ", commands));
+        ProcessBuilder pb = new ProcessBuilder(commands);
         Process p = pb.start();
 
         List<String> text = new ArrayList<>();
@@ -65,9 +72,14 @@ public class NodeResource
                 text.add(line);
             }
         }
-        p.waitFor();
+        int exitCode = p.waitFor();
+        if(exitCode == 0)
+        {
+            LOG.info("Found {} nodes", text.size());
             return text;
         }
+        throw new RuntimeException("Failed to retrieve top nodes.");
+    }
 
     public record NodeStats(Node node, Integer absoluteCpuUsage, Integer relativeCpuUsage, Integer totalCpu, Integer absoluteMemory, Integer relativeMemory, Integer totalMemory)
     {

src/main/java/dev/dinauer/utils/ClientProvider.java

@@ -1,29 +1,32 @@
 package dev.dinauer.utils;
 
 import io.fabric8.kubernetes.client.Config;
-import io.fabric8.kubernetes.client.DefaultKubernetesClient;
 import io.fabric8.kubernetes.client.KubernetesClient;
 import io.fabric8.kubernetes.client.KubernetesClientBuilder;
-import io.fabric8.kubernetes.client.extension.ExtensionAdapter;
-import io.fabric8.kubernetes.client.http.HttpClient;
-import io.fabric8.kubernetes.client.vertx.VertxHttpClientBuilder;
 import io.fabric8.kubernetes.client.vertx.VertxHttpClientFactory;
 import io.vertx.mutiny.core.Vertx;
 import jakarta.enterprise.context.ApplicationScoped;
 import jakarta.inject.Inject;
-import org.eclipse.microprofile.config.ConfigProvider;
+import org.eclipse.microprofile.config.inject.ConfigProperty;
 
 import java.io.File;
 
 @ApplicationScoped
 public class ClientProvider
 {
+    @ConfigProperty(name = "dev.dinauer.kobooboo.kubeconfigs.dir")
+    String configFilePath;
+
     @Inject
     Vertx vertx;
 
     public KubernetesClient getClient()
     {
-        String configFilePath = ConfigProvider.getConfig().getValue("dev.dinauer.kobooboo.kubeconfigs.dir", String.class);
         return new KubernetesClientBuilder().withConfig(Config.fromKubeconfig(new File(configFilePath))).withHttpClientFactory(new VertxHttpClientFactory(vertx.getDelegate())).build();
     }
+
+    public String pathToKubeconfig()
+    {
+        return configFilePath;
+    }
 }

src/main/java/dev/dinauer/utils/StartupService.java

@@ -3,6 +3,7 @@ package dev.dinauer.utils;
 import dev.dinauer.login.User;
 import dev.dinauer.login.UserRepo;
 import io.quarkus.elytron.security.common.BcryptUtil;
+import io.quarkus.runtime.Startup;
 import jakarta.annotation.PostConstruct;
 import jakarta.enterprise.context.ApplicationScoped;
 import jakarta.inject.Inject;
@@ -10,6 +11,7 @@ import jakarta.inject.Inject;
 import java.io.IOException;
 import java.util.Set;
 
+@Startup
 @ApplicationScoped
 public class StartupService
 {