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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.

72 questions
117
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14 answers

Why is docker image eating up my disk space that is not used by docker

I have setup docker and I have used completely different block device to store docker's system data: [root@blink1 /]# cat /etc/sysconfig/docker # /etc/sysconfig/docker other_args="-H tcp://0.0.0.0:9367 -H unix:///var/run/docker.sock -g…
ming.kernel
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47
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4 answers

Clean docker environment: devicemapper

I have a docker environment with 2 containers (Jenkins and Nexus, both with their own named volume). I have a daily cron-job which deletes unused containers and images. This is working fine. But the problem is inside my devicemapper: du -sh…
DenCowboy
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5 answers

Can't run Docker container due device mapper error

I just can't create and run new containers in Docker anymore. But in the same time a can run previously created containers. When I try to do something like this: [user@host ~ ] docker run --name=fpm-5.3 debian:jessie 2014/07/12 07:34:08 Error:…
loadaverage
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11
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1 answer

How to clean docker devicemapper folder properly ?

I have some problem about the storage. The folder /var/lib/docker/devicemapper/ is taking 50% of my storage. In the folder /var/lib/docker/devicemapper/mnt, I have many empty folders. How can I properly clean docker devicemapper and remove all…
Youssouf Maiga
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7
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1 answer

Share docker images between hosts with NFS

I'building a mesosphere infrastructure on AWS instances with 3 master servers (running zookeeper, mesos-master, marathon and haproxy) and N slaves (running mesos-slave and docker). If I run the same container on different slaves marathon downloads…
sekipaolo
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7
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1 answer

How to tell Docker to use dm/LVM backend for volumes instead of vfs

I recently heard (from a RedHat guy) that "direct-LVM"(devicemapper) is the recommended storage-backend for production setups, so I wanted to try that out on a CentOS 7 VM. (where loopback-LVM seems to be the default). So I created a separate…
powo
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6
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0 answers

How do I clear a thinpool device for docker

I am running docker on a Redhat system with devicemapper and thinpool device just as recommended for production systems. Now when I want to reinstall docker I need two steps: 1) remove docker directory (in my case /area51/docker) 2) clear thinpool…
Tom
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6
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1 answer

create device mapper target

I am trying to implement device mapper target by referring to the already existing ones dm-linear, dm-snapshot, dm-cache etc. In my implementation, I need to perform a read/modify/write operation on a certain sector range. Since the device mapper…
Rashid Shaikh
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5
votes
1 answer

docker - driver "devicemapper" failed to remove root filesystem after process in container killed

I am using Docker version 17.06.0-ce on Redhat with devicemapper storage. I am launching a container running a long-running service. The master process inside the container sometimes dies for whatever reason. I get the following error message.…
bjonen
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5
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0 answers

How to mount image in docker whose storage driver is devicemapper

I wonder if I can mount an image(ex. ubuntu image) in docker whose storage driver is devicemapper "without executing it as a container". Actually I succeeded to mount the filesystem in a container like this. type "docker run -it ubuntu" type "df…
Hs Kim
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5
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1 answer

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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4
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1 answer

docker devicemapper data file size increasing exponentially and consuming my host disk 90%

My Docker details Client: Version: 1.11.0 API version: 1.23 Go version: go1.7.1 Git commit: 4dc5990 Built: OS/Arch: linux/amd64 Server: Version: 1.11.0 API version: 1.23 Go version: go1.7.1 Git commit: 4dc5990 …
Chandan Kashyap
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3
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1 answer

LUKS and dm-crypt distinction responsibilities

Reading through the documentation of both dm-crypt and LUKS, I understand that LUKS is a format specification to allow FDE, and that dm-crypt is a dm target which allows encryption / decryption of writes / reads to the block device. However, I'm…
Jasper
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2
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2 answers

Mount LVM overlays/snapshots?

I'm trying to programmatically mount a disk image created with the Fedora LiveUSB creator, and I'm encountering some issues. From what I've been told, it's very difficult to mount LVM snapshots outside of the host system. I have both the "pristine"…
lfaraone
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2
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0 answers

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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