dockerd: Error running deviceCreate (CreatePool) dm_task_run failed
<p>I'm building some CentOS VM with VMWare, with no access to internet, so I've downloaded and made local repositories, including <a href="https://yum.dockerproject.org/repo/main/centos/7/" rel="nofollow noreferrer">this one</a>
Then I have installed docker-engine.x86_64, and when starting the docker daemon, I get the following errors : </p>

<pre><code>[root]# dockerd
DEBU[0000] docker group found. gid: 993
...
...
DEBU[0001] Error retrieving the next available loopback: open /dev/loop-control: no such device
ERRO[0001] **There are no more loopback devices available.**
ERRO[0001] [graphdriver] prior storage driver "devicemapper" failed: loopback attach failed
DEBU[0001] Cleaning up old mountid : start.
FATA[0001] Error starting daemon: error initializing graphdriver: loopback attach failed
</code></pre>

<hr>

<p>After manually add the loop module which control loop device with this command : </p>

<pre><code>insmod /lib/modules/3.10.0-327.36.2.el7.x86_64/kernel/drivers/block/loop.ko
</code></pre>

<p>The error changes to :  </p>

<pre><code> [graphdriver] prior storage driver "devicemapper" failed: devicemapper: Error running deviceCreate (CreatePool) dm_task_run failed
</code></pre>

<p>I've read that it could be because I have not enough space disk, I think it's not that, any idea?</p>

<pre><code>[root]# df -k .
Filesystem               blocs de 1K Used      Available Used Mounted on
/dev/mapper/centos-root    51887356 2436256   49451100   5%    /
</code></pre>