NFS Server Library

Experimental NFSv4 server library in pure go.

The motive I started this project is mainly I need to immigrate a few projects to k8s and there are no other storage services except an OSS(like aws s3). So I need something to join OSS and k8s PV together. To me NFS is a interesting choice.

Currently this repo doesn't include any COS wrapper in it.

Getting start

To give it a try:

package main

import (
	"flag"
	"fmt"
	"os"

	"github.com/smallfz/libnfs-go/auth"
	"github.com/smallfz/libnfs-go/backend"
	"github.com/smallfz/libnfs-go/fs"
	"github.com/smallfz/libnfs-go/log"
	"github.com/smallfz/libnfs-go/memfs"
	"github.com/smallfz/libnfs-go/server"
)

func main() {
	listen := ":2049"
	flag.StringVar(&listen, "l", listen, "Server listen address")
	flag.Parse()

	log.UpdateLevel(log.DEBUG)

	mfs := memfs.NewMemFS()

	// We don't need to create a new fs for each connection as memfs is opaque towards SetCreds.
	// If the file system would depend on SetCreds, make sure to generate a new fs.FS for each connection.
	backend := backend.New(func() fs.FS { return mfs }, auth.Null)

	mfs.MkdirAll("/mount", os.FileMode(0o755))
	mfs.MkdirAll("/test", os.FileMode(0o755))
	mfs.MkdirAll("/test2", os.FileMode(0o755))
	mfs.MkdirAll("/many", os.FileMode(0o755))

	perm := os.FileMode(0o755)
	for i := 0; i < 256; i++ {
		mfs.MkdirAll(fmt.Sprintf("/many/sub-%d", i+1), perm)
	}

	svr, err := server.NewServerTCP(listen, backend)
	if err != nil {
		log.Errorf("server.NewServerTCP: %v", err)
		return
	}

	if err := svr.Serve(); err != nil {
		log.Errorf("svr.Serve: %v", err)
	}
}

After the server started you can mount the in-memory filesystem to local:

on Mac:

mount -o nfsvers=4,noacl,tcp -t nfs localhost:/ /Users/smallfz/mnt

on Linux:

mount -o nfsvers=4,minorversion=0,noacl,tcp -t nfs localhost:/ /mnt

Status

Recent testing results of nfstest_posix with --nfsversion=4:

• access: 58/58 pass
• open: 19/22 pass
• chdir: 3/3 pass
• readdir: 3/3 pass
• opendir: 2/2 pass
• seekdir,rewinddir: 9/9 pass
• telldir: 5/5 pass
• read: 3/3 pass
• write: 7/7 pass
• close: 3/3 pass
• stat: 22/23 pass
• fstat: 22/23 pass
• chmod: 2/16 pass
• creat: 6/6 pass
• unlink: 2/4 pass
• mkdir: 5/7 pass
• rmdir: 3/5 pass
• link: x
• fcntl: x
• ...

Contributing

Firing an issue if anything. Any advice is appreciated.