Mount docker logical volume - linux

Question

I'm trying to access to a logical volume where previously was used by docker. This is the result of various command:
lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
nvme0n1 259:2 0 80G 0 disk
├─nvme0n1p1 259:3 0 80G 0 part /
└─nvme0n1p128 259:4 0 1M 0 part
nvme1n1 259:0 0 80G 0 disk
└─nvme1n1p1 259:1 0 80G 0 part
├─docker-docker--pool_tdata 253:1 0 79G 0 lvm
│ └─docker-docker--pool 253:2 0 79G 0 lvm
└─docker-docker--pool_tmeta 253:0 0 84M 0 lvm
└─docker-docker--pool 253:2 0 79G 0 lvm
fdisk
Disk /dev/nvme1n1: 85.9 GB, 85899345920 bytes, 167772160 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x00029c01
Device Boot Start End Blocks Id System
/dev/nvme1n1p1 2048 167772159 83885056 8e Linux LVM
WARNING: fdisk GPT support is currently new, and therefore in an experimental phase. Use at your own discretion.
Disk /dev/nvme0n1: 85.9 GB, 85899345920 bytes, 167772160 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: gpt
Disk identifier: 358A5F86-3BCA-4FB2-8C00-722B915A71AB
# Start End Size Type Name
1 4096 167772126 80G Linux filesyste Linux
128 2048 4095 1M BIOS boot BIOS Boot Partition
lvdisplay
--- Logical volume ---
LV Name docker-pool
VG Name docker
LV UUID piD2Wx-aDjf-CkpN-b4s4-YXWE-6ERm-GWTcOz
LV Write Access read/write
LV Creation host, time ip-172-31-39-159, 2020-02-16 09:18:57 +0000
LV Pool metadata docker-pool_tmeta
LV Pool data docker-pool_tdata
LV Status available
# open 0
LV Size 79.03 GiB
Allocated pool data 80.07%
Allocated metadata 31.58%
Current LE 20232
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:2
But when I try to mount the volume docker-docker--pool_tdata I get the following error:
mount /dev/mapper/docker-docker--pool_tdata /mnt/test
mount: /dev/mapper/docker-docker--pool_tdata is already mounted or /mnt/test busy
I've also tried to reboot the machine, to uninstall docker and to see if there is file opened on that volume using lsof
Do you have any clue about how can I mount that volume?
Thanks

Answer 1

Uninstalling docker does not really help as purge and autoremove only delete the installed packages and not the images, containers, volumes and config files.
To delete those you have to delete a bunch of directories contained in etc, var/lib, bin andvar/run
Clean up the env
try running docker system prune -a to remove unused containers, images etc
remove the volume with docker volume rm {volumeID}
create the volume again docker volume create docker-docker--pool_tdata
Kill the process
run lsof +D /mnt/test or cat ../docker/../tasks
this should display the PIDs of alive tasks.
Kill the task with kill -9 {PID}