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How To Fix ‘Cannot Mount Readonly’ Error When Mounting Samba Share with mount -t cifs

Ubuntu 5

In this article, we will discuss a common issue that users may encounter when trying to mount a Samba share using the mount -t cifs command on a Linux system. The error message “cannot mount readonly” can be frustrating, but with the right steps, it can be resolved.

Quick Answer

To fix the ‘Cannot Mount Readonly’ error when mounting a Samba share with the mount -t cifs command, you need to ensure that you have the correct permissions to access the shared directory, specify the rw (read-write) option in the mount command, provide authentication details if required, and specify the SMB protocol version if necessary.

Understanding the Issue

Before we delve into the solution, it’s important to understand what this error message means. The “cannot mount readonly” error typically arises when the system is unable to mount a network share with write permissions. This could be due to a variety of reasons, including incorrect mount options, insufficient permissions, or issues with the Samba server configuration.

Prerequisites

To follow along with this guide, you will need:

  • A Linux system with the cifs-utils package installed. This package provides the necessary tools and utilities for mounting CIFS/SMB shares. If you don’t have it installed, you can install it using the package manager specific to your Linux distribution. For Debian-based systems, you can use the following command:
sudo apt-get install cifs-utils
  • Access to a Samba share that you want to mount on your system.

Step 1: Checking Permissions

The first step in resolving the “cannot mount readonly” error is to ensure that you have the correct permissions to access the shared directory. The user specified in the -o username=user option of the mount command should have read and write access to the shared folder on the Samba server.

Step 2: Specifying Mount Options

The next step is to specify the correct mount options when executing the mount command. The -t cifs option tells the system that the file system type is CIFS (Common Internet File System), which is a protocol that allows sharing of files and printers over a network.

The -o option is used to specify various mount options. To fix the “cannot mount readonly” error, you need to include the rw (read-write) option to allow read and write access to the shared directory. Here is an example of how to use these options:

mount -t cifs -o username=user,rw //192.168.0.106/shared /home/user/point

In this command, username=user specifies the username for accessing the Samba share, and rw enables read and write permissions. Replace //192.168.0.106/shared with the address of your Samba share, and /home/user/point with the mount point on your local system.

Step 3: Providing Authentication Details

If the Samba share requires authentication, you may need to provide a password or a credentials file. This can be done using the password=your_password or credentials=/path/to/credentials_file options in the -o option. Replace your_password with your actual password and /path/to/credentials_file with the path to your credentials file.

Here’s an example of how to use these options:

mount -t cifs -o username=user,password=your_password,rw //192.168.0.106/shared /home/user/point

Step 4: Specifying SMB Protocol Version

In some cases, specifying the SMB protocol version can resolve the “cannot mount readonly” error. This can be done using the vers=version_number option in the -o option. For example, to specify SMB protocol version 3.0, you can use the following command:

mount -t cifs -o vers=3.0,username=user,rw //192.168.0.106/shared /home/user/point

Conclusion

By following these steps and making the necessary adjustments to the mount command, you should be able to successfully mount the Samba share without encountering the “cannot mount readonly” error. Remember that the exact command and options you need to use may vary depending on your specific situation, so don’t hesitate to consult the man page for mount.cifs or seek help from online communities if you encounter any issues.

What is the purpose of the `cifs-utils` package?

The cifs-utils package provides tools and utilities for mounting CIFS/SMB shares on a Linux system.

How do I install the `cifs-utils` package on a Debian-based system?

You can install the cifs-utils package on a Debian-based system using the command sudo apt-get install cifs-utils.

What does the “cannot mount readonly” error mean?

The "cannot mount readonly" error occurs when the system is unable to mount a Samba share with write permissions. This can be due to incorrect mount options, insufficient permissions, or issues with the Samba server configuration.

How can I check if I have the correct permissions to access the shared directory?

You can check if you have the correct permissions to access the shared directory by ensuring that the user specified in the -o username=user option of the mount command has read and write access to the shared folder on the Samba server.

How do I specify the correct mount options when using the `mount` command?

To specify the correct mount options when using the mount command, you need to include the -t cifs option to indicate that the file system type is CIFS, and the -o username=user,rw option to enable read and write access to the shared directory. Replace username=user with the appropriate username for accessing the Samba share.

How do I provide authentication details for a Samba share?

If the Samba share requires authentication, you can provide a password using the password=your_password option in the -o option of the mount command. Alternatively, you can use a credentials file by specifying the credentials=/path/to/credentials_file option in the -o option.

Can specifying the SMB protocol version help resolve the “cannot mount readonly” error?

Yes, specifying the SMB protocol version can sometimes resolve the "cannot mount readonly" error. You can do this by using the vers=version_number option in the -o option of the mount command. For example, vers=3.0 specifies SMB protocol version 3.0.

Where can I find more information about the `mount.cifs` command?

You can find more information about the mount.cifs command by consulting the man page for mount.cifs. This page provides detailed documentation on the command and its options.

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