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NFS implementation by Erlang

simplenfs 최신버젼 다운로드

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simplenfs
=========
* Purpose
 - Confirm whether the performance handling NFS protocol generated by [erpcgen](https://github.com/leo-project/erpcgen/) is sufficient or not
 - Need less to say, Out of expectation use in production

* Limitations
 - Lock manager protocol is not implemented
 - The max length of file path is limited up to 64 byte in order to make code concise
 - Some rpcs listed as below are not implemented regarding symbolic link and special file
 
* Not implemented
 - readlink
 - symlink
 - mknod
 - link
 - readdir

* How to set up NFS server 
 - Install/Start
  ```sh
  ## prerequirements: Erlang alrady installed
  ## on shell
  git clone https://github.com/leo-incubator/simplenfs.git
  cd simplenfs
  make
  ## Start dependent services
  sudo /etc/init.d/rpcbind start
  sudo /etc/init.d/rpcidmapd start
  erl -pa ebin
  ```
  ```erlang
  %% on erlang shell
  %% Start NFS written in Erlang!
  simplenfs:start().
  ```

* How to set up NFSv3 client
 - Install
  ```sh
  ## on shell
  sudo yum install nfs-utils
  ```

- Configure
  ```sh 
  ## set MOUNTD_NFS_V3 to yes
  sudo vi /etc/sysconfig/nfs
  
  ## set Defaultvers to 3
  sudo vi /etc/nfsmount.conf
  ```

- Start dependent services
  ```sh
  sudo /etc/init.d/rpcbind start
  ```

- Mount/Uumount
  ```sh
  ## mkdir for the mount point
  sudo mkdir /mnt/nfs
  sudo chown user:group /mnt/nfs
  ## mount without lock manager
  sudo mount -t nfs -o nolock server:/path/for/expose /mnt/nfs
  ## now you can do almost file operations
  echo "hello world" > /mnt/nfs/test.txt
  chmod 400 /mnt/nfs/test.txt
  ls -al /mnt/nfs
  cat /mnt/nfs/test.txt
  vi /mnt/nfs/test.txt
  mv /mnt/nfs/test.txt /mnt/nfs/test2.txt
  rm /mnt/nfs/test.txt
  mkdir -p /mnt/nfs/0/1/2/3
  find /mnt/nfs -type d -ls
  rmdir /mnt/nfs/0/1/2/3
  rm -rf /mnt/nfs/0
  ls -al /mnt/nfs
  ## umount
  sudo umount /mnt/nfs
  ```

* TODO
 - Reduce network traffic since there are some needless round trip between Client/Server
 - Implement acceptor pool
 - Implement file handle cache as necessary
 - benchmark and compare with a generic NFS server

simplenfs

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