Build a File Server with Samba

ktdevx@gmail.com (Kaito Takemura) — Mon, 21 Apr 2025 23:24:39 +0900

In this article, we use Samba to build a file server that can be accessed from Windows.

# Introduction

For the server hardware, GMKtec’s NucBox M5 Plus was selected.

リンク

Since Debian is installed on the mini PC, Samba is installed there to build the file server.

When installing Debian from scratch, also see Install Debian.

# Install Samba

Install Samba with apt.

sudo apt install samba

The Samba installation is complete. Dependencies are installed automatically.

# Create a Partition

Create a partition on the disk where you want to create the shared folder. First, check the list of disks with lsblk.

kaito@file:~$ lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS
sda 8:0 0 32G 0 disk
|-sda1 8:1 0 31G 0 part /
|-sda2 8:2 0 1K 0 part
`-sda5 8:5 0 975M 0 part [SWAP]
sdb 8:16 0 931.5G 0 disk
sr0 11:0 1 1024M 0 rom

sdb is the disk on which the shared folder is created. Create a partition on sdb with fdisk.

kaito@file:~$ sudo fdisk /dev/sdb
Welcome to fdisk (util-linux 2.38.1).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Device does not contain a recognized partition table.
Created a new DOS (MBR) disklabel with disk identifier 0x278ce66c.
Command (m for help): n
Partition type
p primary (0 primary, 0 extended, 4 free)
e extended (container for logical partitions)
Select (default p):
Using default response p.
Partition number (1-4, default 1):
First sector (2048-1953525167, default 2048):
Last sector, +/-sectors or +/-size{K,M,G,T,P} (2048-1953525167, default 1953525167):
Created a new partition 1 of type 'Linux' and of size 931.5 GiB.
Command (m for help): w
The partition table has been altered.
Calling ioctl() to re-read partition table.
Syncing disks.

Run lsblk again to confirm that the partition was created.

kaito@file:~$ lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS
sda 8:0 0 32G 0 disk
|-sda1 8:1 0 31G 0 part /
|-sda2 8:2 0 1K 0 part
`-sda5 8:5 0 975M 0 part [SWAP]
sdb 8:16 0 931.5G 0 disk
`-sdb1 8:17 0 931.5G 0 part
sr0 11:0 1 1024M 0 rom

The sdb1 partition has been added. Next, create a file system on this partition.

# Create a File System

Use mkfs to create an Ext4 file system on the sdb1 partition created earlier.

kaito@file:~$ sudo mkfs -t ext4 /dev/sdb1
mke2fs 1.47.0 (5-Feb-2023)
Discarding device blocks: done
Creating filesystem with 244190390 4k blocks and 61054976 inodes
Filesystem UUID: 2cc13138-06d1-4c28-ae9f-fc126067921a
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
4096000, 7962624, 11239424, 20480000, 23887872, 71663616, 78675968,
102400000, 214990848
Allocating group tables: done
Writing inode tables: done
Creating journal (262144 blocks): done
Writing superblocks and filesystem accounting information: done

The file system has been created.

# Mount the File System

First, check the UUID of the disk partition by running ls -l /dev/disk/by-uuid/.

kaito@file:~$ ls -l /dev/disk/by-uuid/
total 0
lrwxrwxrwx 1 root root 10 Apr 20 01:05 2cc13138-06d1-4c28-ae9f-fc126067921a -> ../../sdb1
lrwxrwxrwx 1 root root 10 Apr 20 00:57 6ee6b083-0585-45dd-b3d2-2add948dd8f3 -> ../../sda1
lrwxrwxrwx 1 root root 10 Apr 20 00:57 837625f1-5be2-4aed-9a8a-cbac1e7c29cc -> ../../sda5

This command lists symbolic links that identify each disk partition by UUID. The UUID of the partition to mount is 2cc13138-06d1-4c28-ae9f-fc126067921a.

Create the directory where the partition will be mounted. In this example, /srv/share is created.

sudo mkdir /srv/share

Configure the file system created earlier to be mounted automatically in this directory.

Automatic mounting is configured in /etc/fstab. Open the file in a text editor and change the settings. The following is an example.

# <file system> <mount point> <type> <options> <dump> <pass>
UUID=2cc13138-06d1-4c28-ae9f-fc126067921a /srv/share ext4 defaults,nofail 0 2

The settings are divided into six fields separated by spaces.

file system
The file system to mount.
mount point
The directory where the file system is mounted.
type
The type of file system to mount, such as ext4 or btrfs.
options
Mount options for the file system. Some file systems have specific settings.
dump
Specifies whether the file system is backed up by the dump command. 1 includes it in backups, and 0 excludes it.
pass
Specifies the order in which fsck checks the file systems at boot. 1 has the highest priority and is required for the root file system. Use 2 for other file systems. 0 disables checking.

After changing the settings, mount the file system with the following commands.

sudo systemctl daemon-reload
sudo mount -a

The file system is mounted according to /etc/fstab. Confirm that it was mounted with the df command.

kaito@file:~$ df -h
Filesystem Size Used Avail Use% Mounted on
udev 462M 0 462M 0% /dev
tmpfs 97M 1.9M 95M 2% /run
/dev/sda1 31G 1.8G 28G 7% /
tmpfs 481M 0 481M 0% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 97M 0 97M 0% /run/user/1000
/dev/sdb1 916G 28K 870G 1% /srv/share

The file system is mounted. Automatic mounting is now configured.

# Create a Group for Shared Folder Access

In this example, the file server is configured so that only users belonging to a specific group can access the shared folder.

Create a group named share and add users who should be allowed to access the shared folder.

sudo groupadd share

After creating the group, change the owning group and permissions of the shared folder. This allows only users belonging to the specific group to access it.

sudo chown root:share /srv/share
sudo chmod 2770 /srv/share

The owning group and permissions have been changed.

# Edit the Samba Configuration File

Edit Samba’s /etc/samba/smb.conf configuration file as follows.

[global]
server role = standalone
security = user
log file = /var/log/samba/log.%m
max log size = 1000
logging = file
panic action = /usr/share/samba/panic-action %d
[share]
path = /srv/share
read only = no
create mask = 0660
directory mask = 0770

Save the file and restart Samba by running sudo systemctl restart smbd.

# Add a User for Shared Folder Access

Create a user who can connect to the file server and add the user to the share group.

sudo useradd user
sudo usermod -aG share user

A user named user has been created. Add the user to the database with pdbedit. You are prompted to enter the password used to log in to the file server.

kaito@file:~$ sudo pdbedit -a user
new password: <file-server-login-password>
retype new password: <file-server-login-password>
Unix username: user
NT username:
Account Flags: [U ]
User SID: S-1-5-21-1396205738-3650286879-311231574-1001
Primary Group SID: S-1-5-21-1396205738-3650286879-311231574-513
Full Name:
Home Directory: \\FILE\user
HomeDir Drive:
Logon Script:
Profile Path: \\FILE\user\profile
Domain: FILE
Account desc:
Workstations:
Munged dial:
Logon time: 0
Logoff time: Thu, 07 Feb 2036 00:06:39 JST
Kickoff time: Thu, 07 Feb 2036 00:06:39 JST
Password last set: Sun, 20 Apr 2025 01:57:46 JST
Password can change: Sun, 20 Apr 2025 01:57:46 JST
Password must change: never
Last bad password : 0
Bad password count : 0
Logon hours : FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF

The user has been added.

The required configuration is complete. Finally, access the shared folder from a client PC.

# Access the Shared Folder

Access the shared folder created with Samba from Windows File Explorer.

Enter the path to the shared folder in the field at the top of the window.

\\<server-IP-address>\<shared-folder>

You are prompted to enter network credentials.

Enter the username and password of the user created in Samba, then select OK.

If the username and password of the user logged in on the client PC match those of the user created in Samba, entering credentials is skipped.

The shared folder can now be accessed. The Samba file server setup is complete.

Samba on KTDEVX