YARN-7654. Support ENTRY_POINT for docker container. Contributed by Eric Yang

(cherry picked from commit 6c8e51ca7e)

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/api/ApplicationConstants.java

@@ -244,7 +244,14 @@ public interface ApplicationConstants {
      * Comma separate list of directories that the container should use for
      * logging.
      */
-    LOG_DIRS("LOG_DIRS");
+    LOG_DIRS("LOG_DIRS"),
+
+    /**
+     * $YARN_CONTAINER_RUNTIME_DOCKER_RUN_OVERRIDE_DISABLE
+     * Final, Docker run support ENTRY_POINT.
+     */
+    YARN_CONTAINER_RUNTIME_DOCKER_RUN_OVERRIDE_DISABLE(
+        "YARN_CONTAINER_RUNTIME_DOCKER_RUN_OVERRIDE_DISABLE");
 
     private final String variable;
     private Environment(String variable) {

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-services/hadoop-yarn-services-core/src/main/java/org/apache/hadoop/yarn/service/provider/AbstractProviderService.java

@@ -58,15 +58,9 @@ public abstract class AbstractProviderService implements ProviderService,
       Service service)
       throws IOException;
 
-  public void buildContainerLaunchContext(AbstractLauncher launcher,
+  public Map<String, String> buildContainerTokens(ComponentInstance instance,
-      Service service, ComponentInstance instance,
+      Container container,
-      SliderFileSystem fileSystem, Configuration yarnConf, Container container,
+      ContainerLaunchService.ComponentLaunchContext compLaunchContext) {
-      ContainerLaunchService.ComponentLaunchContext compLaunchContext)
-      throws IOException, SliderException {
-    processArtifact(launcher, instance, fileSystem, service);
-
-    ServiceContext context =
-        instance.getComponent().getScheduler().getContext();
       // Generate tokens (key-value pair) for config substitution.
       // Get pre-defined tokens
       Map<String, String> globalTokens =
@@ -75,6 +69,15 @@ public abstract class AbstractProviderService implements ProviderService,
           .initCompTokensForSubstitute(instance, container,
               compLaunchContext);
       tokensForSubstitution.putAll(globalTokens);
+      return tokensForSubstitution;
+  }
+
+  public void buildContainerEnvironment(AbstractLauncher launcher,
+      Service service, ComponentInstance instance,
+      SliderFileSystem fileSystem, Configuration yarnConf, Container container,
+      ContainerLaunchService.ComponentLaunchContext compLaunchContext,
+      Map<String, String> tokensForSubstitution)
+          throws IOException, SliderException {
     // Set the environment variables in launcher
     launcher.putEnv(ServiceUtils.buildEnvMap(
         compLaunchContext.getConfiguration(), tokensForSubstitution));
@@ -90,17 +93,14 @@ public abstract class AbstractProviderService implements ProviderService,
     for (Entry<String, String> entry : launcher.getEnv().entrySet()) {
       tokensForSubstitution.put($(entry.getKey()), entry.getValue());
     }
-    //TODO add component host tokens?
+  }
-//    ProviderUtils.addComponentHostTokens(tokensForSubstitution, amState);
-
-    // create config file on hdfs and add local resource
-    ProviderUtils.createConfigFileAndAddLocalResource(launcher, fileSystem,
-        compLaunchContext, tokensForSubstitution, instance, context);
-
-    // handles static files (like normal file / archive file) for localization.
-    ProviderUtils.handleStaticFilesForLocalization(launcher, fileSystem,
-        compLaunchContext);
 
+  public void buildContainerLaunchCommand(AbstractLauncher launcher,
+      Service service, ComponentInstance instance,
+      SliderFileSystem fileSystem, Configuration yarnConf, Container container,
+      ContainerLaunchService.ComponentLaunchContext compLaunchContext,
+      Map<String, String> tokensForSubstitution)
+          throws IOException, SliderException {
     // substitute launch command
     String launchCommand = compLaunchContext.getLaunchCommand();
     // docker container may have empty commands
@@ -112,10 +112,15 @@ public abstract class AbstractProviderService implements ProviderService,
       operation.addOutAndErrFiles(OUT_FILE, ERR_FILE);
       launcher.addCommand(operation.build());
     }
+  }
 
+  public void buildContainerRetry(AbstractLauncher launcher,
+      Configuration yarnConf,
+      ContainerLaunchService.ComponentLaunchContext compLaunchContext) {
     // By default retry forever every 30 seconds
     launcher.setRetryContext(
-        YarnServiceConf.getInt(CONTAINER_RETRY_MAX, DEFAULT_CONTAINER_RETRY_MAX,
+        YarnServiceConf.getInt(CONTAINER_RETRY_MAX,
+            DEFAULT_CONTAINER_RETRY_MAX,
             compLaunchContext.getConfiguration(), yarnConf),
         YarnServiceConf.getInt(CONTAINER_RETRY_INTERVAL,
             DEFAULT_CONTAINER_RETRY_INTERVAL,
@@ -124,4 +129,38 @@ public abstract class AbstractProviderService implements ProviderService,
             DEFAULT_CONTAINER_FAILURES_VALIDITY_INTERVAL,
             compLaunchContext.getConfiguration(), yarnConf));
   }
+
+  public void buildContainerLaunchContext(AbstractLauncher launcher,
+      Service service, ComponentInstance instance,
+      SliderFileSystem fileSystem, Configuration yarnConf, Container container,
+      ContainerLaunchService.ComponentLaunchContext compLaunchContext)
+      throws IOException, SliderException {
+    processArtifact(launcher, instance, fileSystem, service);
+
+    ServiceContext context =
+        instance.getComponent().getScheduler().getContext();
+    // Generate tokens (key-value pair) for config substitution.
+    Map<String, String> tokensForSubstitution =
+        buildContainerTokens(instance, container, compLaunchContext);
+
+    // Setup launch context environment
+    buildContainerEnvironment(launcher, service, instance,
+        fileSystem, yarnConf, container, compLaunchContext,
+        tokensForSubstitution);
+
+    // create config file on hdfs and add local resource
+    ProviderUtils.createConfigFileAndAddLocalResource(launcher, fileSystem,
+        compLaunchContext, tokensForSubstitution, instance, context);
+
+    // handles static files (like normal file / archive file) for localization.
+    ProviderUtils.handleStaticFilesForLocalization(launcher, fileSystem,
+        compLaunchContext);
+
+    // replace launch command with token specific information
+    buildContainerLaunchCommand(launcher, service, instance, fileSystem,
+        yarnConf, container, compLaunchContext, tokensForSubstitution);
+
+    // Setup container retry settings
+    buildContainerRetry(launcher, yarnConf, compLaunchContext);
+  }
 }

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-services/hadoop-yarn-services-core/src/main/java/org/apache/hadoop/yarn/service/provider/docker/DockerProviderService.java

@@ -17,13 +17,23 @@
  */
 package org.apache.hadoop.yarn.service.provider.docker;
 
+import org.apache.commons.lang.StringUtils;
+import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.yarn.service.component.instance.ComponentInstance;
 import org.apache.hadoop.yarn.service.provider.AbstractProviderService;
+import org.apache.hadoop.yarn.service.provider.ProviderUtils;
+import org.apache.hadoop.yarn.api.records.Container;
+import org.apache.hadoop.yarn.service.api.records.Component;
 import org.apache.hadoop.yarn.service.api.records.Service;
 import org.apache.hadoop.yarn.service.utils.SliderFileSystem;
 import org.apache.hadoop.yarn.service.containerlaunch.AbstractLauncher;
+import org.apache.hadoop.yarn.service.containerlaunch.CommandLineBuilder;
+import org.apache.hadoop.yarn.service.containerlaunch.ContainerLaunchService;
+import org.apache.hadoop.yarn.service.exceptions.SliderException;
+import org.apache.hadoop.yarn.api.ApplicationConstants.Environment;
 
 import java.io.IOException;
+import java.util.Map;
 
 public class DockerProviderService extends AbstractProviderService
     implements DockerKeys {
@@ -39,4 +49,36 @@ public class DockerProviderService extends AbstractProviderService
     launcher.setRunPrivilegedContainer(
         compInstance.getCompSpec().getRunPrivilegedContainer());
   }
+
+  @Override
+  public void buildContainerLaunchCommand(AbstractLauncher launcher,
+      Service service, ComponentInstance instance,
+      SliderFileSystem fileSystem, Configuration yarnConf, Container container,
+      ContainerLaunchService.ComponentLaunchContext compLaunchContext,
+      Map<String, String> tokensForSubstitution)
+          throws IOException, SliderException {
+    Component component = instance.getComponent().getComponentSpec();
+    boolean useEntryPoint = Boolean.parseBoolean(component
+        .getConfiguration().getEnv(Environment
+          .YARN_CONTAINER_RUNTIME_DOCKER_RUN_OVERRIDE_DISABLE.name()));
+    if (useEntryPoint) {
+      String launchCommand = component.getLaunchCommand();
+      if (!StringUtils.isEmpty(launchCommand)) {
+        launcher.addCommand(launchCommand);
+      }
+    } else {
+      // substitute launch command
+      String launchCommand = compLaunchContext.getLaunchCommand();
+      // docker container may have empty commands
+      if (!StringUtils.isEmpty(launchCommand)) {
+        launchCommand = ProviderUtils
+            .substituteStrWithTokens(launchCommand, tokensForSubstitution);
+        CommandLineBuilder operation = new CommandLineBuilder();
+        operation.add(launchCommand);
+        operation.addOutAndErrFiles(OUT_FILE, ERR_FILE);
+        launcher.addCommand(operation.build());
+      }
+    }
+  }
+
 }

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/launcher/ContainerLaunch.java

@@ -1677,6 +1677,20 @@ public class ContainerLaunch implements Callable<Integer> {
       containerLogDirs, Map<Path, List<String>> resources,
       Path nmPrivateClasspathJarDir,
       Set<String> nmVars) throws IOException {
+    // Based on discussion in YARN-7654, for ENTRY_POINT enabled
+    // docker container, we forward user defined environment variables
+    // without node manager environment variables.  This is the reason
+    // that we skip sanitizeEnv method.
+    boolean overrideDisable = Boolean.parseBoolean(
+        environment.get(
+            Environment.
+                YARN_CONTAINER_RUNTIME_DOCKER_RUN_OVERRIDE_DISABLE.
+                    name()));
+    if (overrideDisable) {
+      environment.remove("WORK_DIR");
+      return;
+    }
+
     /**
      * Non-modifiable environment variables
      */

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/linux/runtime/DockerLinuxContainerRuntime.java

@@ -235,7 +235,6 @@ public class DockerLinuxContainerRuntime implements LinuxContainerRuntime {
   @InterfaceAudience.Private
   public static final String ENV_DOCKER_CONTAINER_DELAYED_REMOVAL =
       "YARN_CONTAINER_RUNTIME_DOCKER_DELAYED_REMOVAL";
-
   private Configuration conf;
   private Context nmContext;
   private DockerClient dockerClient;
@@ -736,6 +735,8 @@ public class DockerLinuxContainerRuntime implements LinuxContainerRuntime {
     String imageName = environment.get(ENV_DOCKER_CONTAINER_IMAGE);
     String network = environment.get(ENV_DOCKER_CONTAINER_NETWORK);
     String hostname = environment.get(ENV_DOCKER_CONTAINER_HOSTNAME);
+    boolean useEntryPoint = Boolean.parseBoolean(environment
+              .get(ENV_DOCKER_CONTAINER_RUN_OVERRIDE_DISABLE));
 
     if(network == null || network.isEmpty()) {
       network = defaultNetwork;
@@ -797,8 +798,6 @@ public class DockerLinuxContainerRuntime implements LinuxContainerRuntime {
     @SuppressWarnings("unchecked")
     DockerRunCommand runCommand = new DockerRunCommand(containerIdStr,
         dockerRunAsUser, imageName)
-        .detachOnRun()
-        .setContainerWorkDir(containerWorkDir.toString())
         .setNetworkType(network);
     // Only add hostname if network is not host or if Registry DNS is enabled.
     if (!network.equalsIgnoreCase("host") ||
@@ -870,19 +869,22 @@ public class DockerLinuxContainerRuntime implements LinuxContainerRuntime {
 
     addCGroupParentIfRequired(resourcesOpts, containerIdStr, runCommand);
 
-    String disableOverride = environment.get(
+    if (useEntryPoint) {
-        ENV_DOCKER_CONTAINER_RUN_OVERRIDE_DISABLE);
+      runCommand.setOverrideDisabled(true);
-
+      runCommand.addEnv(environment);
-    if (disableOverride != null && disableOverride.equals("true")) {
+      runCommand.setOverrideCommandWithArgs(container.getLaunchContext()
-      LOG.info("command override disabled");
+          .getCommands());
+      runCommand.disableDetach();
+      runCommand.setLogDir(container.getLogDir());
     } else {
       List<String> overrideCommands = new ArrayList<>();
       Path launchDst =
           new Path(containerWorkDir, ContainerLaunch.CONTAINER_SCRIPT);
-
       overrideCommands.add("bash");
       overrideCommands.add(launchDst.toUri().getPath());
+      runCommand.setContainerWorkDir(containerWorkDir.toString());
       runCommand.setOverrideCommandWithArgs(overrideCommands);
+      runCommand.detachOnRun();
     }
 
     if(enableUserReMapping) {

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/linux/runtime/docker/DockerClient.java

@@ -49,6 +49,7 @@ public final class DockerClient {
        LoggerFactory.getLogger(DockerClient.class);
   private static final String TMP_FILE_PREFIX = "docker.";
   private static final String TMP_FILE_SUFFIX = ".cmd";
+  private static final String TMP_ENV_FILE_SUFFIX = ".env";
   private final String tmpDirPath;
 
   public DockerClient(Configuration conf) throws ContainerExecutionException {
@@ -69,15 +70,15 @@ public final class DockerClient {
 
   public String writeCommandToTempFile(DockerCommand cmd, String filePrefix)
       throws ContainerExecutionException {
-    File dockerCommandFile = null;
     try {
-      dockerCommandFile = File.createTempFile(TMP_FILE_PREFIX + filePrefix,
+      File dockerCommandFile = File.createTempFile(TMP_FILE_PREFIX + filePrefix,
         TMP_FILE_SUFFIX, new
         File(tmpDirPath));
-
+      try (
         Writer writer = new OutputStreamWriter(
             new FileOutputStream(dockerCommandFile), "UTF-8");
         PrintWriter printWriter = new PrintWriter(writer);
+      ) {
         printWriter.println("[docker-command-execution]");
         for (Map.Entry<String, List<String>> entry :
             cmd.getDockerCommandWithArguments().entrySet()) {
@@ -94,15 +95,31 @@ public final class DockerClient {
           printWriter.println("  " + entry.getKey() + "=" + StringUtils
               .join(",", entry.getValue()));
         }
-      printWriter.close();
-
         return dockerCommandFile.getAbsolutePath();
+      }
     } catch (IOException e) {
       LOG.warn("Unable to write docker command to temporary file!");
       throw new ContainerExecutionException(e);
     }
   }
 
+  private String writeEnvFile(DockerRunCommand cmd, String filePrefix,
+      File cmdDir) throws IOException {
+    File dockerEnvFile = File.createTempFile(TMP_FILE_PREFIX + filePrefix,
+        TMP_ENV_FILE_SUFFIX, cmdDir);
+    try (
+        Writer envWriter = new OutputStreamWriter(
+            new FileOutputStream(dockerEnvFile), "UTF-8");
+        PrintWriter envPrintWriter = new PrintWriter(envWriter);
+    ) {
+      for (Map.Entry<String, String> entry : cmd.getEnv()
+          .entrySet()) {
+        envPrintWriter.println(entry.getKey() + "=" + entry.getValue());
+      }
+      return dockerEnvFile.getAbsolutePath();
+    }
+  }
+
   public String writeCommandToTempFile(DockerCommand cmd,
       ContainerId containerId, Context nmContext)
       throws ContainerExecutionException {
@@ -126,13 +143,13 @@ public final class DockerClient {
         throw new IOException("Cannot create container private directory "
             + cmdDir);
       }
-
       dockerCommandFile = File.createTempFile(TMP_FILE_PREFIX + filePrefix,
           TMP_FILE_SUFFIX, cmdDir);
-
+      try (
         Writer writer = new OutputStreamWriter(
             new FileOutputStream(dockerCommandFile.toString()), "UTF-8");
         PrintWriter printWriter = new PrintWriter(writer);
+      ) {
         printWriter.println("[docker-command-execution]");
         for (Map.Entry<String, List<String>> entry :
             cmd.getDockerCommandWithArguments().entrySet()) {
@@ -149,9 +166,15 @@ public final class DockerClient {
           printWriter.println("  " + entry.getKey() + "=" + StringUtils
               .join(",", entry.getValue()));
         }
-      printWriter.close();
+        if (cmd instanceof DockerRunCommand) {
-
+          DockerRunCommand runCommand = (DockerRunCommand) cmd;
+          if (runCommand.containsEnv()) {
+            String path = writeEnvFile(runCommand, filePrefix, cmdDir);
+            printWriter.println("  environ=" + path);
+          }
+        }
         return dockerCommandFile.toString();
+      }
     } catch (IOException e) {
       LOG.warn("Unable to write docker command to " + cmdDir);
       throw new ContainerExecutionException(e);

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/linux/runtime/docker/DockerRunCommand.java

@@ -21,12 +21,14 @@
 package org.apache.hadoop.yarn.server.nodemanager.containermanager.linux.runtime.docker;
 
 import java.io.File;
+import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
 
 public class DockerRunCommand extends DockerCommand {
   private static final String RUN_COMMAND = "run";
+  private final Map<String, String> userEnv;
 
   /** The following are mandatory: */
   public DockerRunCommand(String containerId, String user, String image) {
@@ -34,6 +36,7 @@ public class DockerRunCommand extends DockerCommand {
     super.addCommandArguments("name", containerId);
     super.addCommandArguments("user", user);
     super.addCommandArguments("image", image);
+    this.userEnv = new LinkedHashMap<String, String>();
   }
 
   public DockerRunCommand removeContainerOnExit() {
@@ -174,4 +177,45 @@ public class DockerRunCommand extends DockerCommand {
   public Map<String, List<String>> getDockerCommandWithArguments() {
     return super.getDockerCommandWithArguments();
   }
+
+  public DockerRunCommand setOverrideDisabled(boolean toggle) {
+    String value = Boolean.toString(toggle);
+    super.addCommandArguments("use-entry-point", value);
+    return this;
+  }
+
+  public DockerRunCommand setLogDir(String logDir) {
+    super.addCommandArguments("log-dir", logDir);
+    return this;
+  }
+
+  /**
+   * Check if user defined environment variables are empty.
+   *
+   * @return true if user defined environment variables are not empty.
+   */
+  public boolean containsEnv() {
+    if (userEnv.size() > 0) {
+      return true;
+    }
+    return false;
+  }
+
+  /**
+   * Get user defined environment variables.
+   *
+   * @return a map of user defined environment variables
+   */
+  public Map<String, String> getEnv() {
+    return userEnv;
+  }
+
+  /**
+   * Add user defined environment variables.
+   *
+   * @param environment A map of user defined environment variables
+   */
+  public final void addEnv(Map<String, String> environment) {
+    userEnv.putAll(environment);
+  }
 }

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/native/container-executor/impl/container-executor.c

@@ -94,6 +94,8 @@ static gid_t nm_gid = -1;
 struct configuration CFG = {.size=0, .sections=NULL};
 struct section executor_cfg = {.size=0, .kv_pairs=NULL};
 
+static char *chosen_container_log_dir = NULL;
+
 char *concatenate(char *concat_pattern, char *return_path_name,
    int numArgs, ...);
 
@@ -755,8 +757,9 @@ static int create_container_directories(const char* user, const char *app_id,
       } else if (mkdirs(container_log_dir, perms) != 0) {
         free(container_log_dir);
       } else {
-        free(container_log_dir);
         result = 0;
+        chosen_container_log_dir = strdup(container_log_dir);
+        free(container_log_dir);
       }
     }
     free(combined_name);
@@ -1129,6 +1132,34 @@ char* get_container_log_directory(const char *log_root, const char* app_id,
                      container_id);
 }
 
+char *init_log_path(const char *container_log_dir, const char *logfile) {
+  char *tmp_buffer = NULL;
+  tmp_buffer = make_string("%s/%s", container_log_dir, logfile);
+
+  mode_t permissions = S_IRUSR | S_IWUSR | S_IRGRP;
+  int fd = open(tmp_buffer, O_CREAT | O_WRONLY, permissions);
+  if (fd >= 0) {
+    close(fd);
+    if (change_owner(tmp_buffer, user_detail->pw_uid, user_detail->pw_gid) != 0) {
+      fprintf(ERRORFILE, "Failed to chown %s to %d:%d: %s\n", tmp_buffer, user_detail->pw_uid, user_detail->pw_gid,
+          strerror(errno));
+      free(tmp_buffer);
+      tmp_buffer = NULL;
+    } else if (chmod(tmp_buffer, permissions) != 0) {
+      fprintf(ERRORFILE, "Can't chmod %s - %s\n",
+              tmp_buffer, strerror(errno));
+      free(tmp_buffer);
+      tmp_buffer = NULL;
+    }
+  } else {
+    fprintf(ERRORFILE, "Failed to create file %s - %s\n", tmp_buffer,
+            strerror(errno));
+    free(tmp_buffer);
+    tmp_buffer = NULL;
+  }
+  return tmp_buffer;
+}
+
 int create_container_log_dirs(const char *container_id, const char *app_id,
                               char * const * log_dirs) {
   char* const* log_root;
@@ -1506,6 +1537,7 @@ int launch_docker_container_as_user(const char * user, const char *app_id,
   char *docker_inspect_exitcode_command = NULL;
   int container_file_source =-1;
   int cred_file_source = -1;
+  int use_entry_point = 0;
 
   gid_t user_gid = getegid();
   uid_t prev_uid = geteuid();
@@ -1560,6 +1592,18 @@ int launch_docker_container_as_user(const char * user, const char *app_id,
     goto cleanup;
   }
 
+  use_entry_point = get_use_entry_point_flag();
+  char *so = init_log_path(chosen_container_log_dir, "stdout.txt");
+  if (so == NULL) {
+    exit_code = UNABLE_TO_EXECUTE_CONTAINER_SCRIPT;
+    goto cleanup;
+  }
+  char *se = init_log_path(chosen_container_log_dir, "stderr.txt");
+  if (se == NULL) {
+    exit_code = UNABLE_TO_EXECUTE_CONTAINER_SCRIPT;
+    goto cleanup;
+  }
+
   docker_command_with_binary = flatten(docker_command);
 
   // Launch container
@@ -1573,9 +1617,70 @@ int launch_docker_container_as_user(const char * user, const char *app_id,
   }
 
   if (child_pid == 0) {
+    FILE* so_fd = fopen(so, "a+");
+    if (so_fd == NULL) {
+      fprintf(ERRORFILE, "Could not append to %s\n", so);
+      exit_code = UNABLE_TO_EXECUTE_CONTAINER_SCRIPT;
+      goto cleanup;
+    }
+    FILE* se_fd = fopen(se, "a+");
+    if (se_fd == NULL) {
+      fprintf(ERRORFILE, "Could not append to %s\n", se);
+      exit_code = UNABLE_TO_EXECUTE_CONTAINER_SCRIPT;
+      fclose(so_fd);
+      goto cleanup;
+    }
+    // if entry point is enabled, clone docker command output
+    // to stdout.txt and stderr.txt for yarn.
+    if (use_entry_point) {
+      fprintf(so_fd, "Launching docker container...\n");
+      fprintf(so_fd, "Docker run command: %s\n", docker_command_with_binary);
+      if (dup2(fileno(so_fd), fileno(stdout)) == -1) {
+        fprintf(ERRORFILE, "Could not append to stdout.txt\n");
+        fclose(so_fd);
+        return UNABLE_TO_EXECUTE_CONTAINER_SCRIPT;
+      }
+      if (dup2(fileno(se_fd), fileno(stderr)) == -1) {
+        fprintf(ERRORFILE, "Could not append to stderr.txt\n");
+        fclose(se_fd);
+        return UNABLE_TO_EXECUTE_CONTAINER_SCRIPT;
+      }
+    }
+    fclose(so_fd);
+    fclose(se_fd);
     execvp(docker_binary, docker_command);
     fprintf(ERRORFILE, "failed to execute docker command! error: %s\n", strerror(errno));
     return UNABLE_TO_EXECUTE_CONTAINER_SCRIPT;
+  } else {
+    if (use_entry_point) {
+      int pid = 0;
+      int res = 0;
+      int count = 0;
+      int max_retries = get_max_retries(&CFG);
+      docker_inspect_command = make_string(
+          "%s inspect --format {{.State.Pid}} %s",
+          docker_binary, container_id);
+      // check for docker container pid
+      while (count < max_retries) {
+        fprintf(LOGFILE, "Inspecting docker container...\n");
+        fprintf(LOGFILE, "Docker inspect command: %s\n", docker_inspect_command);
+        fflush(LOGFILE);
+        FILE* inspect_docker = popen(docker_inspect_command, "r");
+        res = fscanf (inspect_docker, "%d", &pid);
+        fprintf(LOGFILE, "pid from docker inspect: %d\n", pid);
+        if (pclose (inspect_docker) != 0 || res <= 0) {
+          fprintf (ERRORFILE,
+              "Could not inspect docker to get pid %s.\n", docker_inspect_command);
+          fflush(ERRORFILE);
+          exit_code = UNABLE_TO_EXECUTE_CONTAINER_SCRIPT;
+        } else {
+          if (pid != 0) {
+            break;
+          }
+        }
+        sleep(3);
+        count++;
+      }
     } else {
       exit_code = wait_and_get_exit_code(child_pid);
       if (exit_code != 0) {
@@ -1583,6 +1688,7 @@ int launch_docker_container_as_user(const char * user, const char *app_id,
         goto cleanup;
       }
     }
+  }
 
   docker_inspect_command = make_string(
     "%s inspect --format {{.State.Pid}} %s",

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/native/container-executor/impl/utils/docker-util.c

@@ -32,6 +32,8 @@
 #include <pwd.h>
 #include <errno.h>
 
+int entry_point = 0;
+
 static int read_and_verify_command_file(const char *command_file, const char *docker_command,
                                         struct configuration *command_config) {
   int ret = 0;
@@ -336,6 +338,17 @@ const char *get_docker_error_message(const int error_code) {
   }
 }
 
+int get_max_retries(const struct configuration *conf) {
+  int retries = 10;
+  char *max_retries = get_configuration_value(DOCKER_INSPECT_MAX_RETRIES_KEY,
+      CONTAINER_EXECUTOR_CFG_DOCKER_SECTION, conf);
+  if (max_retries != NULL) {
+    retries = atoi(max_retries);
+    free(max_retries);
+  }
+  return retries;
+}
+
 char *get_docker_binary(const struct configuration *conf) {
   char *docker_binary = NULL;
   docker_binary = get_configuration_value(DOCKER_BINARY_KEY, CONTAINER_EXECUTOR_CFG_DOCKER_SECTION, conf);
@@ -348,6 +361,10 @@ char *get_docker_binary(const struct configuration *conf) {
   return docker_binary;
 }
 
+int get_use_entry_point_flag() {
+  return entry_point;
+}
+
 int docker_module_enabled(const struct configuration *conf) {
   struct section *section = get_configuration_section(CONTAINER_EXECUTOR_CFG_DOCKER_SECTION, conf);
   if (section != NULL) {
@@ -365,6 +382,12 @@ int get_docker_command(const char *command_file, const struct configuration *con
     return INVALID_COMMAND_FILE;
   }
 
+  char *value = get_configuration_value("use-entry-point", DOCKER_COMMAND_FILE_SECTION, &command_config);
+  if (value != NULL && strcasecmp(value, "true") == 0) {
+    entry_point = 1;
+  }
+  free(value);
+
   char *command = get_configuration_value("docker-command", DOCKER_COMMAND_FILE_SECTION, &command_config);
   if (strcmp(DOCKER_INSPECT_COMMAND, command) == 0) {
     return get_docker_inspect_command(command_file, conf, args);
@@ -1009,6 +1032,24 @@ static int set_devices(const struct configuration *command_config, const struct
   return ret;
 }
 
+static int set_env(const struct configuration *command_config, struct args *args) {
+  int ret = 0;
+  // Use envfile method.
+  char *envfile = get_configuration_value("environ", DOCKER_COMMAND_FILE_SECTION, command_config);
+  if (envfile != NULL) {
+    ret = add_to_args(args, "--env-file");
+    if (ret != 0) {
+      ret = BUFFER_TOO_SMALL;
+    }
+    ret = add_to_args(args, envfile);
+    if (ret != 0) {
+      ret = BUFFER_TOO_SMALL;
+    }
+    free(envfile);
+  }
+  return ret;
+}
+
 /**
  * Helper function to help normalize mounts for checking if mounts are
  * permitted. The function does the following -
@@ -1520,6 +1561,11 @@ int get_docker_run_command(const char *command_file, const struct configuration
     return ret;
   }
 
+  ret = set_env(&command_config, args);
+  if (ret != 0) {
+    return BUFFER_TOO_SMALL;
+  }
+
   ret = add_to_args(args, image);
   if (ret != 0) {
     reset_args(args);

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/native/container-executor/impl/utils/docker-util.h

@@ -23,6 +23,7 @@
 
 #define CONTAINER_EXECUTOR_CFG_DOCKER_SECTION "docker"
 #define DOCKER_BINARY_KEY "docker.binary"
+#define DOCKER_INSPECT_MAX_RETRIES_KEY "docker.inspect.max.retries"
 #define DOCKER_COMMAND_FILE_SECTION "docker-command-execution"
 #define DOCKER_INSPECT_COMMAND "inspect"
 #define DOCKER_LOAD_COMMAND "load"
@@ -85,6 +86,12 @@ char *get_docker_binary(const struct configuration *conf);
  */
 int get_docker_command(const char* command_file, const struct configuration* conf, args *args);
 
+/**
+ * Check if use-entry-point flag is set.
+ * @return 0 when use-entry-point flag is set.
+ */
+int get_use_entry_point_flag();
+
 /**
  * Get the Docker inspect command line string. The function will verify that the params file is meant for the
  * inspect command.
@@ -202,4 +209,11 @@ void reset_args(args *args);
  * @param args Pointer reference to args data structure
  */
 char** extract_execv_args(args *args);
+
+/**
+ * Get max retries for docker inspect.
+ * @param conf Configuration structure
+ * @return value of max retries
+ */
+int get_max_retries(const struct configuration *conf);
 #endif

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/native/container-executor/test/utils/test_docker_util.cc

@@ -1312,6 +1312,48 @@ namespace ContainerExecutor {
     run_docker_command_test(file_cmd_vec, bad_file_cmd_vec, get_docker_run_command);
   }
 
+  TEST_F(TestDockerUtil, test_docker_run_entry_point) {
+
+    std::string container_executor_contents = "[docker]\n"
+        "  docker.allowed.ro-mounts=/var,/etc,/usr/bin/cut\n"
+        "  docker.allowed.rw-mounts=/tmp\n  docker.allowed.networks=bridge\n "
+        "  docker.privileged-containers.enabled=1\n  docker.allowed.capabilities=CHOWN,SETUID\n"
+        "  docker.allowed.devices=/dev/test\n  docker.privileged-containers.registries=hadoop\n";
+    write_file(container_executor_cfg_file, container_executor_contents);
+    int ret = read_config(container_executor_cfg_file.c_str(), &container_executor_cfg);
+    if (ret != 0) {
+      FAIL();
+    }
+    ret = create_ce_file();
+    if (ret != 0) {
+      std::cerr << "Could not create ce file, skipping test" << std::endl;
+      return;
+    }
+
+    std::vector<std::pair<std::string, std::string> > file_cmd_vec;
+    file_cmd_vec.push_back(std::make_pair<std::string, std::string>(
+        "[docker-command-execution]\n"
+        "  docker-command=run\n"
+        "  name=container_e1_12312_11111_02_000001\n"
+        "  image=hadoop/docker-image\n"
+        "  user=nobody\n"
+        "  use-entry-point=true\n"
+        "  environ=/tmp/test.env\n",
+        "/usr/bin/docker run --name=container_e1_12312_11111_02_000001 --user=nobody --cap-drop=ALL "
+        "--env-file /tmp/test.env hadoop/docker-image"));
+
+    std::vector<std::pair<std::string, int> > bad_file_cmd_vec;
+
+    bad_file_cmd_vec.push_back(std::make_pair<std::string, int>(
+        "[docker-command-execution]\n"
+        "  docker-command=run\n"
+        "  image=hadoop/docker-image\n"
+        "  user=nobody",
+        static_cast<int>(INVALID_DOCKER_CONTAINER_NAME)));
+
+    run_docker_command_test(file_cmd_vec, bad_file_cmd_vec, get_docker_run_command);
+  }
+
   TEST_F(TestDockerUtil, test_docker_run_no_privileged) {
 
     std::string container_executor_contents[] = {"[docker]\n  docker.allowed.ro-mounts=/var,/etc,/usr/bin/cut\n"

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-site/src/site/markdown/DockerContainers.md

@@ -207,6 +207,7 @@ are allowed. It contains the following properties:
 | `docker.host-pid-namespace.enabled` | Set to "true" or "false" to enable or disable using the host's PID namespace. Default value is "false". |
 | `docker.privileged-containers.enabled` | Set to "true" or "false" to enable or disable launching privileged containers. Default value is "false". |
 | `docker.privileged-containers.registries` | Comma separated list of trusted docker registries for running trusted privileged docker containers.  By default, no registries are defined. |
+| `docker.inspect.max.retries` | Integer value to check docker container readiness.  Each inspection is set with 3 seconds delay.  Default value of 10 will wait 30 seconds for docker container to become ready before marked as container failed. |
 
 Please note that if you wish to run Docker containers that require access to the YARN local directories, you must add them to the docker.allowed.rw-mounts list.