diff --git a/api.go b/api.go
index ba8646599d..4d294667ac 100644
--- a/api.go
+++ b/api.go
@@ -345,11 +345,11 @@ func postCommit(srv *Server, version float64, w http.ResponseWriter, r *http.Req
 		return err
 	}
 	var (
-		config = &Config{}
+		config engine.Env
 		env    engine.Env
 		job    = srv.Eng.Job("commit", r.Form.Get("container"))
 	)
-	if err := json.NewDecoder(r.Body).Decode(config); err != nil && err != io.EOF {
+	if err := config.Import(r.Body); err != nil {
 		utils.Errorf("%s", err)
 	}
 
@@ -357,7 +357,7 @@ func postCommit(srv *Server, version float64, w http.ResponseWriter, r *http.Req
 	job.Setenv("tag", r.Form.Get("tag"))
 	job.Setenv("author", r.Form.Get("author"))
 	job.Setenv("comment", r.Form.Get("comment"))
-	job.SetenvJson("config", config)
+	job.SetenvSubEnv("config", &config)
 
 	var id string
 	job.Stdout.AddString(&id)
@@ -704,18 +704,14 @@ func postContainersAttach(srv *Server, version float64, w http.ResponseWriter, r
 		return fmt.Errorf("Missing parameter")
 	}
 
-	// TODO: replace the buffer by job.AddEnv()
 	var (
 		job    = srv.Eng.Job("inspect", vars["name"], "container")
-		buffer = bytes.NewBuffer(nil)
-		c      Container
+		c, err = job.Stdout.AddEnv()
 	)
-	job.Stdout.Add(buffer)
-	if err := job.Run(); err != nil {
+	if err != nil {
 		return err
 	}
-
-	if err := json.Unmarshal(buffer.Bytes(), &c); err != nil {
+	if err = job.Run(); err != nil {
 		return err
 	}
 
@@ -742,7 +738,7 @@ func postContainersAttach(srv *Server, version float64, w http.ResponseWriter, r
 
 	fmt.Fprintf(outStream, "HTTP/1.1 200 OK\r\nContent-Type: application/vnd.docker.raw-stream\r\n\r\n")
 
-	if !c.Config.Tty && version >= 1.6 {
+	if c.GetSubEnv("Config") != nil && !c.GetSubEnv("Config").GetBool("Tty") && version >= 1.6 {
 		errStream = utils.NewStdWriter(outStream, utils.Stderr)
 		outStream = utils.NewStdWriter(outStream, utils.Stdout)
 	} else {
diff --git a/engine/env.go b/engine/env.go
index f93555a40b..f30e135555 100644
--- a/engine/env.go
+++ b/engine/env.go
@@ -86,6 +86,28 @@ func (env *Env) GetList(key string) []string {
 	return l
 }
 
+func (env *Env) GetSubEnv(key string) *Env {
+	sval := env.Get(key)
+	if sval == "" {
+		return nil
+	}
+	buf := bytes.NewBufferString(sval)
+	var sub Env
+	if err := sub.Decode(buf); err != nil {
+		return nil
+	}
+	return &sub
+}
+
+func (env *Env) SetSubEnv(key string, sub *Env) error {
+	var buf bytes.Buffer
+	if err := sub.Encode(&buf); err != nil {
+		return err
+	}
+	env.Set(key, string(buf.Bytes()))
+	return nil
+}
+
 func (env *Env) GetJson(key string, iface interface{}) error {
 	sval := env.Get(key)
 	if sval == "" {
diff --git a/engine/job.go b/engine/job.go
index 34393fcab5..5447441beb 100644
--- a/engine/job.go
+++ b/engine/job.go
@@ -114,6 +114,14 @@ func (job *Job) SetenvBool(key string, value bool) {
 	job.env.SetBool(key, value)
 }
 
+func (job *Job) GetenvSubEnv(key string) *Env {
+	return job.env.GetSubEnv(key)
+}
+
+func (job *Job) SetenvSubEnv(key string, value *Env) error {
+	return job.env.SetSubEnv(key, value)
+}
+
 func (job *Job) GetenvInt64(key string) int64 {
 	return job.env.GetInt64(key)
 }
diff --git a/server.go b/server.go
index a6f869f977..2df7a8abc6 100644
--- a/server.go
+++ b/server.go
@@ -1660,8 +1660,7 @@ func (srv *Server) ContainerCreate(job *engine.Job) engine.Status {
 	}
 	resolvConf, err := utils.GetResolvConf()
 	if err != nil {
-		job.Error(err)
-		return engine.StatusErr
+		return job.Error(err)
 	}
 	if !config.NetworkDisabled && len(config.Dns) == 0 && len(srv.runtime.config.Dns) == 0 && utils.CheckLocalDns(resolvConf) {
 		job.Errorf("WARNING: Docker detected local DNS server on resolv.conf. Using default external servers: %v\n", defaultDns)