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add troubleshooting (#5387) 

* add troubleshooting

See: https://github.com/moby/moby/issues/34343

* express better
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mrfly 2017-11-29 00:10:44 +08:00 committed by Jim Galasyn
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10
engine/userguide/storagedriver/device-mapper-driver.md
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@ -623,6 +623,16 @@ block device and other parameters to suit your situation.
<output truncated> <output truncated>
``` ```
### Activate the `devicemapper` after reboot
If you reboot the host and find that the docker service failed to start,
you'll see the error, "Non existing device". You need to re-activate the
logical volumes with this command:
```bash
sudo lvchange -ay docker/thinpool
```
## How the `devicemapper` storage driver works ## How the `devicemapper` storage driver works
> **Warning**: Do not directly manipulate any files or directories within > **Warning**: Do not directly manipulate any files or directories within