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Questions tagged [device-mapper]

Block layer component of the Linux kernel to create and manage virtual block devices atop of physical block devices. QUESTIONS MUST BE PROGRAMMING RELATED.

69 questions
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Data Space Used not matching docker images output

The output for docker info shows that I'm using 515.1 GB of 622.8 GB $ docker info . . Server Version: 1.13.0 Storage Driver: devicemapper Pool Name: vg-thinpool Pool Blocksize: 524.3 kB Base Device Size: 10.74 GB Backing Filesystem: xfs Data…
brogand93
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Implications of exposing /var/lib/docker over NFS to serve hosts with limited memory

What are the implications of exporting /var/lib/docker over NFS? The idea is to store the docker images in a server and export it to hosts which has limited memory to store and run containers. This would be useful to avoid having each host download…
koshyg
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Get dm-verity status (Corrupted or Verified) on Android using veritysetup

I'm trying to get dm-verity status from adb shell using veritysetup, but all the devices I'm passing result in: # cryptsetup 1.3.1 processing "./veritysetup --debug --verbose status /dev/device-mapper" # Running command status. # Initialising…
madhat1
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Docker aufs and devicemapper directories both exist

I am trying to clean up some space on my server and found that both /var/lib/docker/aufs and /var/lib/docker/devicemapper exist. Usage of /: 86.8% of 78.62GB Users logged in: 0 ncdu 1.10 ~ Use the arrow keys to navigate, press ? for…
saul.shanabrook
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Can I port a Linux DMA driver to Windows?

I want to run it on Windows without a significant change. I hope, I can change only headers and corresponding functions. http://www.alterawiki.com/wiki/File:G2x4_avmm_dma_Linux.tar.gz
snow
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Compiling/linking applications using libdevmapper

I'm actually doing a make and make install in the LVM source code directory so I can compile and link my application using -ldevmapper. I'm wondering if this is the only way (correct way) to build/link applications using libdevmapper ?
ydev
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Where can I find documentation on the raw dm_mirror interface?

I'd like to use dm_mirror directly, rather than through LVM or MD, but I've had trouble finding clear documentation on the table format it expects. Is such a document available somewhere? Note that I want to use this to mirror one partition to…
bdonlan
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How to solve /dev/mapper/docker full?

I'm working on some docker container. While trying to install some python packages /dev/mapper/docker gets filled. I read Clean docker environment: devicemapper, but this would stop ruining containers and impact the current workflow. How can I…
catsarecats
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create a non-trivial device mapper target

I am trying to write a remapping target for usage with DM. I followed instructions from several places (including this Answer) all essentially giving the same code. This is ok, but not enough for me. I need to modify "in transit" data of struct bio…
ZioByte
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Docker devicemapper (direct-lvm) metadata gets huge amount of folders

Hi i have 3 node Swarm docker setup (1 manager, 2 nodes) on Centos 7. I'm using devicemapper data storage for all three VM's. The problem is that after some time folder: /var/lib/docker/devicemapper/metadata and ../mnt have so many files / folders…
masahuku
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Double layer of device mapper - customising dm-crypt

Is it possible to create a device mapper over another device mapper? I need to apply some checks in addition to encrypting the data on disk. So, I thought of creating a mapper (for additional checks) over the mapper created by dm-crypt and use new…
user2255299
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docker aufs to devicemapper docker container and images migration

I'm on Ubuntu, changing default docker storage driver from aufs to devicemapper. I've some docker images and containers on aufs. i took backup of aufs storage files from /var/lib/docker . how can i import aufs images and containers to devicemapper…
Ningappa
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google/cadvisor:latest image monitor container run error

I found the bug below on the above "devicemapper" at bugzilla.redhat.com. It let me install the "device-mapper-persistent-data" package. However, when I installed it, I received the following error. I tried to use this link to solve the error,…
Jason Tom
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Docker service process zombie holding a Device Mapper managed device

I'm running RHEL (kernel 4.1.12) with Docker (1.12.1) and my docker service dockerd became a zombie [dockerd] with PID 412 # ps -a | grep dockerd 1 412 412 412 ? -1 Zsl 0 23:28 [dockerd] and it holds…
Stepan Vavra
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No Space on CentOS with Docker

I was using Docker on my CentOS machine for a while and had lot of images and containers (around 4GBs). My machine has 8GBs os storage and I kept getting an error from devicemapper whenever trying to remove a Docker container or Docker image with…
pcsram
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