Red Hat / CentOS

How to Install and Configure Samba on CentOS 8

How to Install and Configure Samba on CentOS 8

How to Install and Configure Samba on CentOS 8

In this tutorial, we’re going to learn how to install and configure a samba server on CentOS 8/RHEL8 to share files on the local network. Samba is a free and open-source SMB/CIFS protocol implementation for Unix and Linux that allows for file and print sharing between Linux, Windows and macOS machines in a local area network.

Samba is usually installed and run on Linux. It comprises several programs that serve different but related purposes, the most important two of which are:

  • smbd: provides SMB/CIFS service (file sharing and printing), can also act as a Windows domain controller.
  • nmbd: This daemon provides NetBIOS name service, listens for name-server requests. It also allows the Samba server to be found by other computers on the network.

1. Install Samba Server

By default, the Samba package is available in the CentOS default repository. You can install it with the following command:

# dnf install samba samba-common samba-client -y

start the SMB service and enable it to start after system reboot with the following command:

# systemctl start smb.service
# systemctl enable smb.service
# systemctl start nmb.service
# systemctl enable nmb.service

You can now verify the Samba service with the following command:

# systemctl status smb

You should get the following output:

smb.service - Samba SMB Daemon
   Loaded: loaded (/usr/lib/systemd/system/smb.service; disabled; vendor preset: disabled)
   Active: active (running) since Mon 2020-03-02 23:03:30 EST; 8s ago
     Docs: man:smbd(8)
           man:samba(7)
           man:smb.conf(5)
 Main PID: 2072 (smbd)
   Status: "smbd: ready to serve connections..."
    Tasks: 4 (limit: 25028)
   Memory: 33.8M
   CGroup: /system.slice/smb.service
           ??2072 /usr/sbin/smbd --foreground --no-process-group
           ??2074 /usr/sbin/smbd --foreground --no-process-group
           ??2075 /usr/sbin/smbd --foreground --no-process-group
           ??2076 /usr/sbin/smbd --foreground --no-process-group

To check your Samba version, run

# smbd --version

Run the following command to open the above ports in the firewall.

# firewall-cmd --permanent --add-service=samba

Reload firwall daemon for the change the take effect.

# systemctl reload firewalld

2. Create a Public Share with Samba

In this section, we will create a public share with Samba so everyone can access the public share directory without a password.

Create a Public Share Directory

First, create a shared folder named public and also create two files inside the public directory:

# mkdir -p /samba/share/public
# touch /samba/share/public/file1.txt
# touch /samba/share/public/file2.txt

Next, assign the necessary permissions and ownership with the following command:

# chmod -R 0755 /samba/share/
# chmod -R 0755 /samba/share/public
# chown -R nobody:nobody /samba/share
# chown -R nobody:nobody /samba/share/public
# chcon -t samba_share_t /samba/share/public

How to Install and Configure Samba on CentOS 8

Configure Samba

Next, you will need to configure Samba to share a public directory.

First, create a backup copy of /etc/samba/smb.conf file with the following command:

# mv /etc/samba/smb.conf /etc/samba/smb.bak

Next, create a new Samba configuration file:

# vi /etc/samba/smb.conf

Add the following lines:

[global]
workgroup = WORKGROUP
server string = Samba Server %v
netbios name = samba-server
security = user
map to guest = bad user
dns proxy = no

[Public]
path = /samba/share/public
browsable =yes
writable = yes
guest ok = yes
read only = no

How to Install and Configure Samba on CentOS 8
Save and close the file. Then, restart Samba service to apply the changes:

# systemctl restart smb

Next, test the Samba configuration with the following command:

# testparm

How to Install and Configure Samba on CentOS 8
You should see the following output:

Load smb config files from /etc/samba/smb.conf
Loaded services file OK.
Server role: ROLE_STANDALONE

Press enter to see a dump of your service definitions

# Global parameters
[global]
	dns proxy = No
	map to guest = Bad User
	netbios name = SAMBA-SERVER
	security = USER
	server string = Samba Server %v
	idmap config * : backend = tdb

[Public]
	guest ok = Yes
	path = /samba/share/public
	read only = No

Configure SELinux

Next, set the proper SELinux boolean and security context values on share directory with the following command:

# setsebool -P samba_export_all_ro=1 samba_export_all_rw=1
# semanage fcontext -a -t samba_share_t "/samba/share/public(/.*)?"
# restorecon /samba/share/public

3. Access Samba Share from Windows 

Access Samba Share Path

Now open Run prompt by pressing win + r key on your keyboard then type \\IP and press enter key.

You will see Anonymous folder like below

Now you can add files/folders in this folder to share with other users.

How to Install and Configure Samba on CentOS 8

Create samba secure share 

Create a secured share on the server where only allowed user can login and set appropriate permissions on it and allow SELINUX for the samba configuration.

Create group for samba users

# groupadd securedgroup

Create samba user with securedgroup

# useradd demo -G securedgroup

Add user to samba database and set its password

# smbpasswd -a demo

Now create secure share folder for samba users and set necessary permissions.

mkdir -p /srv/samba/secured
chmod -R 0770 /srv/samba/secured
chcon -t samba_share_t /srv/samba/secured
chown -R root:securedgroup /srv/samba/secured/

Now add following lines in samba configuration file.

# vi /etc/samba/smb.conf
[secured]
path = /srv/samba/secured
valid users = @securedgroup
guest ok = no
writable = yes
browsable = yes

Then restart samba

# systemctl restart smb.service

Now access secured share from Windows

Now you can access the RHEL 8 secured folder from windows, open Run prompt by pressing win + r key on your keyboard
Then type \\SAMBA-SERVER-IP and press enter key.

My samba server IP is 192.168.130.152 so i will use \\192.168.1.200

Now Click on secured folder and it will ask you to enter samba user login details to access the folder.

You will see secured folder like below, Now you can add files/folders in this folder to share with other samba users.

4. Access Samba Share from Ubuntu

I am going to use Ubuntu to access RHEL 8 Samba secure share.
Login to Ubuntu, open terminal and run below command.

First install samba client

# apt-get install samba-client -y

Now use below command to verify Samba Share is accessible.

# smbclient --user=demo -L //192.168.1.200

Command Syntax:
smbclient –user=samba-username -L //Samba-Server-IP

# smbclient //192.168.1.200/secured -U demo

Conclusions

In this tutorial we saw how to install samba on a RHEL 8 / CentOS 8 system. We also saw how to share a directory, allowing access to guests or restricting it to authenticated users. We also saw how to configure the firewall in order for the share to be accessible from other machines on the network.

Finally, we saw how to perform the needed changes in order to have a working samba setup with SELinux in “enforcing” mode.

About the author

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jon snow

Jon is a Linux and F.O.S.S enthusiast, an upcoming Linux SysAdmin, and currently a content creator for ERRORHAT who loves working with computers and strongly believes in sharing knowledge.

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