Do not stop execution if cgroup mountpoint is not found

runtime.go

@@ -305,18 +305,22 @@ func NewRuntime() (*Runtime, error) {
 		log.Printf("WARNING: You are running linux kernel version %s, which might be unstable running docker. Please upgrade your kernel to 3.8.0.", k.String())
 	}
 
-	cgroupMemoryMountpoint, err := FindCgroupMountpoint("memory")
-	if err != nil {
-		return nil, err
-	}
-
-	_, err1 := ioutil.ReadFile(path.Join(cgroupMemoryMountpoint, "/memory.limit_in_bytes"))
-	_, err2 := ioutil.ReadFile(path.Join(cgroupMemoryMountpoint, "memory.soft_limit_in_bytes"))
-	runtime.capabilities.MemoryLimit = err1 == nil && err2 == nil
-
-	_, err = ioutil.ReadFile(path.Join(cgroupMemoryMountpoint, "memeory.memsw.limit_in_bytes"))
-	runtime.capabilities.SwapLimit = err == nil
+	if cgroupMemoryMountpoint, err := FindCgroupMountpoint("memory"); err != nil {
+		log.Printf("WARNING: %s\n", err)
+	} else {
+		_, err1 := ioutil.ReadFile(path.Join(cgroupMemoryMountpoint, "memory.limit_in_bytes"))
+		_, err2 := ioutil.ReadFile(path.Join(cgroupMemoryMountpoint, "memory.soft_limit_in_bytes"))
+		runtime.capabilities.MemoryLimit = err1 == nil && err2 == nil
+		if !runtime.capabilities.MemoryLimit {
+		   	log.Printf("WARNING: Your kernel does not support cgroup memory limit.")
+		}
 
+		_, err = ioutil.ReadFile(path.Join(cgroupMemoryMountpoint, "memory.memsw.limit_in_bytes"))
+		runtime.capabilities.SwapLimit = err == nil
+		if !runtime.capabilities.SwapLimit {
+		   	log.Printf("WARNING: Your kernel does not support cgroup swap limit.")
+		}
+	}
 	return runtime, nil
 }
 

utils.go

@@ -503,7 +503,6 @@ func FindCgroupMountpoint(cgroupType string) (string, error) {
 		if len(r) == 2 {
 			return r[1], nil
 		}
-		fmt.Printf("line: %s (%d)\n", line, len(r))
 	}
-	return "", fmt.Errorf("cgroup mountpoint not found")
+	return "", fmt.Errorf("cgroup mountpoint not found for %s", cgroupType)
 }