Disk partition or block device needs to be mounted before it can be used. Linux supports mounting via device or partition name, partition label, or UUID. Mounting via UUID is the most reliable way as the UUID value doesn't change just as a device name would. It also avoids possible name conflict when using labels.
Mount USB HDD by UUID in Linux
I am connecting a couple of external USB hard drives. I want them to be mounted on specific folders during startup. I am unable to boot using /etc/fstab if one of the drive is not connected. so I am using an init script. But /dev/sdbx enumeration is not always same to use with mount /dev/sdX /some/mount/folder in the init script.
I want to mount the usb drive in /media based on the UUID of the disk. How can I use the UUID of a usb drive in a udev rules file and what is a udev rule to mount the usb drive with the UUID number as the folder name.
Udev has a quite powerful variable and attribute substitution syntax. Specifically every occurrence of $envID_FS_UUID will be replaced with the UUID of the drive. So to mount a device under /media/UUID you could use this rule:
The UUID of a partition is required mainly for mounting the partitions correctly in a computer system where hundreds of hard drives are installed. If you mount the hard drives or SSDs using UUIDs, there is almost zero changes of the wrong hard drive getting mounted and causing serious data loss.
Now that you know how to find the UUID of the storage devices in Linux, you can learn how to mount the partitions with UUID. I have written a dedicated article on how to mount partitions with UUID using the /etc/fstab file. You can read it at _partition_uuid_label_linux/
I am beginner in ubuntu linux and i need to write simple bash script, that can identify necessary flash drive(which contains only one vfat partition) using uuid of this partition, and get the mount point of this flash drive.The /etc/fstab file does'nt contains mountig rule for this drive.For example, let partition uuid as 7DCD-9380Using the readlink tool i can get device link in /dev catalog :
I read that tune2fs cannot be used to modify the UUID for NTFS partitions, because this is technically not a UUID, but a serial number. Any suggestions on how I can mount the two disks without causing conflicts?
Short of writing a script to check the output of fdisk -l, how can I mount this drive at boot time only if it is present? It would be handy to have an fdisk entry for this drive, so I can just type mount /jgdata instead of needing a device name.
The correct option to add in fstab is nofail, however, it needs to come after auto. If you change it to noauto, it will never mount during boot. If you add nobootwait to the bootloader, you could potentially miss something serious, such as mounting the partition before fsck finishes checking it, or not mounting a partition that is used in the boot process.
After making the above change, The system will start normally (and mount the volume) if the device is plugged in while the system is shutdown.It will also boot normally if the device is not present at boot time.
The only inconvenience is that if you connect the device while the system is running, depending on configuration (too many variables to test), the device may not mount immediately. This can be remedied with a simple mount -a or mount /specific_device or a reboot.
If you use the nofail option in /etc/fstab, the system will look for your disk (and partition) at boot time. If the device is plugged, the filesystem will be mounted. If not, the boot will continue as normal.
it doesn't automatically mount if present, but it does get it known if present so a simple mount /jgdata works...then a scripted mount /jdata wouldn't need an output check, just catch the error and keep booting
The recommended way to mount during the boot is instructing their system through the fstab file. Looking at your Ask, I could see you are almost there, lacks only the instruction that sets the device to use automount options, allowing your system to mount the device when its available.
Using the Raspberry Pi OS Desktop, any (readable) hard drive that is connected will be mounted automatically in the folder /media/pi/. It is subsequently very easy to share this folder over the network and thereby make the Raspberry Pi into a NAS, following the filesharing guide. In this way you can connect your external hard disk, SSD, or USB stick to any of the USB ports on the Raspberry Pi, and mount the file system to access the data stored on it. Your Raspberry Pi is actually in that way acting as a dedicated NAS-drive!
If you want to mount your drive manually, such as to make sure that the mount location is always the same or when not having access to the Desktop interface, connect the drive to your Raspberry Pi and create a target folder to be the mount point of the storage device, e.g. exdisk:
The drives added to your fstab file should be automatically mounted upon startup. In some cases this does not happen, which may be to due with the type of drive you are mounting (e.g. cifs) or that your Raspberry Pi has not yet connected to the network at the mounting it is trying to mount the drive. To help overcome this I found it is best to add a mount command to the rc.local file. To do so, edit the rc.local file:
After you attach an Amazon EBS volume to your instance, it is exposed as a block device. You can format the volume with any file system and then mount it. After you make the EBS volume available for use, you can access it in the same ways that you access any other volume. Any data written to this file system is written to the EBS volume and is transparent to applications using the device.
The device could be attached to the instance with a different device name than you specified in the block device mapping. For more information, see Device names on Linux instances. Use the lsblk command to view your available disk devices and their mount points (if applicable) to help you determine the correct device name to use. The output of lsblk removes the /dev/ prefix from full device paths.
The following is example output for an instance built on the Nitro System, which exposes EBS volumes as NVMe block devices. The root device is /dev/nvme0n1, which has two partitions named nvme0n1p1 and nvme0n1p128. The attached volume is /dev/nvme1n1, which has no partitions and is not yet mounted.
Determine whether there is a file system on the volume. New volumes are raw block devices, and you must create a file system on them before you can mount and use them. Volumes that were created from snapshots likely have a file system on them already; if you create a new file system on top of an existing file system, the operation overwrites your data.
Do not use this command if you're mounting a volume that already has data on it (for example, a volume that was created from a snapshot). Otherwise, you'll format the volume and delete the existing data.
Use the mkdir command to create a mount point directory for the volume. The mount point is where the volume is located in the file system tree and where you read and write files to after you mount the volume. The following example creates a directory named /data.
Review the file permissions of your new volume mount to make sure that your users and applications can write to the volume. For more information about file permissions, see File security at The Linux Documentation Project.
Add the following entry to /etc/fstab to mount the device at the specified mount point. The fields are the UUID value returned by blkid (or lsblk for Ubuntu 18.04), the mount point, the file system, and the recommended file system mount options. For more information about the required fields, run man fstab to open the fstab manual.
In the following example, we mount the device with UUID aebf131c-6957-451e-8d34-ec978d9581ae to mount point /data and we use the xfs file system. We also use the defaults and nofail flags. We specify 0 to prevent the file system from being dumped, and we specify 2 to indicate that it is a non-root device.
If you ever boot your instance without this volume attached (for example, after moving the volume to another instance), the nofail mount option enables the instance to boot even if there are errors mounting the volume. Debian derivatives, including Ubuntu versions earlier than 16.04, must also add the nobootwait mount option.
To verify that your entry works, run the following commands to unmount the device and then mount all file systems in /etc/fstab. If there are no errors, the /etc/fstab file is OK and your file system will mount automatically after it is rebooted.
Hi I am new to Ubuntu and recently installed 14.04 LTS. I am having issues with mounting external hard drives for all users at start up. For example, after start up if I login as a user A, only user A can access the external media, and others can't access these external media. Could someone please help me fix this issue.
To mount a partition at startup for all users, we need an entry in the fstab file. What is happening presently is, the HDD is getting mounted for the user who logs in which gives access permissions to only that user. By adding an entry in the fstab, the partition will be mounted by root with access to all users. this r/w access can be controlled later on.
now create a folder, for example sudo mkdir /media/ExtHDD01. This is the folder where your external HDD partition will be mounted at. This folder will be owned by root. To give other users permission to r/w into this folder we need to give the proper permissions. so chmod -R 777 /media/ExtHDD01 would be good enough. Now you need to edit your fstab file. to do so, type the following command.
Each file system is described in a separate line. These definitions will be converted into systemd mount units dynamically at boot, and when the configuration of the system manager is reloaded. The default setup will automatically fsck and mount file systems before starting services that need them to be mounted. For example, systemd automatically makes sure that remote file system mounts like NFS or Samba are only started after the network has been set up. Therefore, local and remote file system mounts specified in /etc/fstab should work out-of-the-box. See systemd.mount(5) for details. 2ff7e9595c
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