diff --git a/src/container.c b/src/container.c
index 011e42f..ef7839c 100644
--- a/src/container.c
+++ b/src/container.c
@@ -499,47 +499,21 @@ static int hyper_rescan_scsi(void)
 struct hyper_container_arg {
 	struct hyper_container	*c;
 	struct hyper_pod	*pod;
-	int			ipcns;
-	int			utsns;
 	int			pipe[2];
 };
 
-static int hyper_container_init(void *data)
+static int hyper_setup_container_rootfs(void *data)
 {
 	struct hyper_container_arg *arg = data;
 	struct hyper_container *container = arg->c;
 	char root[512], rootfs[512];
 	int setup_dns;
 
-	fprintf(stdout, "%s in\n", __func__);
-	if (container->exec.argv == NULL) {
-		fprintf(stdout, "no cmd!\n");
-		goto fail;
-	}
-
-	if (setns(arg->ipcns, CLONE_NEWIPC) < 0) {
-		perror("setns to ipcns of pod init faild");
-		goto fail;
-	}
-
-	if (setns(arg->utsns, CLONE_NEWUTS) < 0) {
-		perror("setns to ipcns of pod init faild");
-		goto fail;
-	}
-
 	if (hyper_rescan_scsi() < 0) {
 		fprintf(stdout, "rescan scsi failed\n");
 		goto fail;
 	}
 
-	// set early env. the container env config can overwrite it
-	setenv("HOME", "/root", 1);
-	setenv("HOSTNAME", arg->pod->hostname, 1);
-	if (container->exec.tty)
-		setenv("TERM", "xterm", 1);
-	else
-		unsetenv("TERM");
-
 	if (mount("", "/", NULL, MS_SLAVE|MS_REC, NULL) < 0) {
 		perror("mount SLAVE failed");
 		goto fail;
@@ -650,7 +624,8 @@ static int hyper_container_init(void *data)
 	}
 
 	hyper_send_type(arg->pipe[1], READY);
-	hyper_exec_process(&container->exec);
+	fflush(NULL);
+	_exit(0);
 
 fail:
 	hyper_send_type(arg->pipe[1], ERROR);
@@ -674,23 +649,15 @@ static int hyper_setup_pty(struct hyper_container *c)
 		return -1;
 	}
 
-	if (hyper_setup_exec_tty(&c->exec) < 0) {
-		fprintf(stderr, "setup container pts failed\n");
-		return -1;
-	}
-
 	return 0;
 }
 
-int hyper_start_container(struct hyper_container *container,
-			  int utsns, int ipcns, struct hyper_pod *pod)
+int hyper_setup_container(struct hyper_container *container, struct hyper_pod *pod)
 {
 	int stacksize = getpagesize() * 42;
 	struct hyper_container_arg arg = {
 		.c	= container,
 		.pod	= pod,
-		.utsns	= utsns,
-		.ipcns	= ipcns,
 		.pipe	= {-1, -1},
 	};
 	int flags = CLONE_NEWNS | SIGCHLD;
@@ -699,24 +666,18 @@ int hyper_start_container(struct hyper_container *container,
 	uint32_t type;
 	int pid;
 
-	if (container->image == NULL || container->exec.argv == NULL) {
-		fprintf(stdout, "container root image %s, argv %p\n",
-			container->image, container->exec.argv);
-		goto fail;
-	}
-
 	if (pipe2(arg.pipe, O_CLOEXEC) < 0) {
 		perror("create pipe between pod init execcmd failed");
 		goto fail;
 	}
 
-	if (hyper_setup_pty(container) < 0) {
-		fprintf(stderr, "setup pty device for container failed\n");
+	if (hyper_setup_container_portmapping(container, pod) < 0) {
+		perror("fail to setup port mapping for container");
 		goto fail;
 	}
 
-	if (hyper_watch_exec_pty(&container->exec, pod) < 0) {
-		fprintf(stderr, "faile to watch container pty\n");
+	if (hyper_setup_pty(container) < 0) {
+		fprintf(stderr, "setup pty device for container failed\n");
 		goto fail;
 	}
 
@@ -726,7 +687,7 @@ int hyper_start_container(struct hyper_container *container,
 		goto fail;
 	}
 
-	pid = clone(hyper_container_init, stack + stacksize, flags, &arg);
+	pid = clone(hyper_setup_container_rootfs, stack + stacksize, flags, &arg);
 	free(stack);
 	if (pid < 0) {
 		perror("create child process failed");
@@ -746,24 +707,12 @@ int hyper_start_container(struct hyper_container *container,
 		goto fail;
 	}
 
-	container->exec.pid = pid;
-	list_add_tail(&container->exec.list, &pod->exec_head);
-	container->exec.ref++;
-
 	close(arg.pipe[0]);
 	close(arg.pipe[1]);
-	fprintf(stdout, "container %s,init pid %d,ref %d\n", container->id, pid, container->exec.ref);
 	return 0;
 fail:
 	close(container->ns);
-	hyper_reset_event(&container->exec.stdinev);
-	hyper_reset_event(&container->exec.stdoutev);
-	hyper_reset_event(&container->exec.stderrev);
 	container->ns = -1;
-	fprintf(stdout, "container %s init exit code %d\n", container->id, -1);
-	container->exec.code = -1;
-	container->exec.seq = 0;
-	container->exec.ref = 0;
 	close(arg.pipe[0]);
 	close(arg.pipe[1]);
 	return -1;
diff --git a/src/container.h b/src/container.h
index ec7406c..19f1e5f 100644
--- a/src/container.h
+++ b/src/container.h
@@ -53,8 +53,7 @@ struct hyper_container {
 
 struct hyper_pod;
 
-int hyper_start_container(struct hyper_container *container,
-			  int utsns, int ipcns, struct hyper_pod *pod);
+int hyper_setup_container(struct hyper_container *container, struct hyper_pod *pod);
 struct hyper_container *hyper_find_container(struct hyper_pod *pod, const char *id);
 void hyper_cleanup_container(struct hyper_container *container, struct hyper_pod *pod);
 void hyper_cleanup_containers(struct hyper_pod *pod);
diff --git a/src/init.c b/src/init.c
index 27f22c8..323b452 100644
--- a/src/init.c
+++ b/src/init.c
@@ -274,141 +274,18 @@ fail:
 	goto out;
 }
 
-struct hyper_stage0_arg {
-	struct hyper_pod	*pod;
-	struct hyper_container	*container;
-	int			ctl_pipe[2];
-};
-
-// stage0: enter the pidns
-static int hyper_container_stage0(void *data)
-{
-	int pidns, ipcns, utsns, ret;
-	struct hyper_container *c;
-	struct hyper_stage0_arg *arg;
-	struct hyper_pod *pod;
-	char path[64];
-
-	arg = data;
-	pod = arg->pod;
-	c   = arg->container;
-
-	ret = pidns = ipcns = utsns = -1;
-
-	sprintf(path, "/proc/%d/ns/pid", pod->init_pid);
-	pidns = open(path, O_RDONLY| O_CLOEXEC);
-	if (pidns < 0) {
-		perror("fail to open pidns of pod init");
-		goto out;
-	}
-
-	/* enter pidns of pod init, so the children of this process will run in
-	 * pidns of pod init, see man 2 setns */
-	if (setns(pidns, CLONE_NEWPID) < 0) {
-		perror("enter pidns of pod init failed");
-		goto out;
-	}
-
-	sprintf(path, "/proc/%d/ns/uts", pod->init_pid);
-	utsns = open(path, O_RDONLY| O_CLOEXEC);
-	if (utsns < 0) {
-		perror("fail to open utsns of pod init");
-		goto out;
-	}
-
-	sprintf(path, "/proc/%d/ns/ipc", pod->init_pid);
-	ipcns = open(path, O_RDONLY| O_CLOEXEC);
-	if (ipcns < 0) {
-		perror("fail to open ipcns of pod init");
-		goto out;
-	}
-
-	ret = hyper_start_container(c, utsns, ipcns, pod);
-out:
-	close(pidns);
-	close(utsns);
-	close(ipcns);
-
-	if (hyper_send_type(arg->ctl_pipe[1], ret ? ERROR : READY) < 0) {
-		fprintf(stderr, "container init send ready message failed\n");
-	}
-
-	/* hyper_container_stage0 shares fd table with init, let init closes pipe. */
-	//close(arg->ctl_pipe[0]);
-	//close(arg->ctl_pipe[1]);
-
-	_exit(ret);
-}
-
-int hyper_start_container_stage0(struct hyper_container *c, struct hyper_pod *pod)
-{
-	int stacksize = getpagesize() * 4;
-	void *stack = NULL;
-	struct hyper_stage0_arg arg = {
-		.pod		= pod,
-		.container	= c,
-		.ctl_pipe	= {-1, -1},
-	};
-	int ret = -1, pid, status;
-	uint32_t type;
-
-	if (pipe2(arg.ctl_pipe, O_CLOEXEC) < 0) {
-		perror("create pipe between hyper init and pod init failed");
-		goto out;
-	}
-
-	stack = malloc(stacksize);
-	if (stack == NULL) {
-		perror("fail to allocate stack for container init");
-		goto out;
-	}
-
-	if (hyper_setup_container_portmapping(c, pod) < 0) {
-		perror("fail to setup port mapping for container");
-		goto out;
-	}
-
-	pid = clone(hyper_container_stage0, stack + stacksize, CLONE_VM| CLONE_FILES| SIGQUIT, &arg);
-	if (pid < 0) {
-		perror("enter container pid ns failed");
-		goto out;
-	}
-
-	if (waitpid(pid, &status, __WCLONE) <= 0) {
-		perror("waiting hyper_container_stage0 finish failed");
-		goto out;
-	}
-
-	/* Wait for container start */
-	if (hyper_get_type(arg.ctl_pipe[0], &type) < 0) {
-		perror("get enter_container_pidns ready message failed");
-		goto out;
-	}
-
-	if (type != READY) {
-		fprintf(stderr, "get incorrect enter_container_pidns message type %d, expect READY\n",
-			type);
-		goto out;
-	}
-
-	/* container process is spawned and ready to execute */
-	pod->remains++;
-	ret = 0;
-out:
-	close(arg.ctl_pipe[0]);
-	close(arg.ctl_pipe[1]);
-
-	free(stack);
-	return ret;
-}
-
 int hyper_start_containers(struct hyper_pod *pod)
 {
 	struct hyper_container *c;
 
+	// TODO: setup containers and run container init processes
+	//       via separated hyperstart APIs
 	list_for_each_entry(c, &pod->containers, list) {
-		if (hyper_start_container_stage0(c, pod) < 0)
+		if (hyper_setup_container(c, pod) < 0)
 			return -1;
+		if (hyper_run_process(&c->exec) < 0)
+			return -1;
+		pod->remains++;
 	}
 
 	return 0;
@@ -665,7 +542,9 @@ static int hyper_new_container(char *json, int length)
 	}
 
 	list_add_tail(&c->list, &pod->containers);
-	ret = hyper_start_container_stage0(c, pod);
+	ret = hyper_setup_container(c, pod);
+	if (ret >= 0)
+		ret = hyper_run_process(&c->exec);
 	if (ret < 0) {
 		//TODO full grace cleanup
 		hyper_cleanup_container(c, pod);