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Fix step required to ensure the logical volume is being monitored

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DanHam 2018-04-14 01:38:18 +01:00
parent a2230dac45
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18
storage/storagedriver/device-mapper-driver.md
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@ -311,16 +311,28 @@ assumes that the Docker daemon is in the `stopped` state.
Logical volume docker/thinpool changed. Logical volume docker/thinpool changed.
``` ```
11. Enable monitoring for logical volumes on your host. Without this step, 11. Ensure monitoring of the logical volume is enabled.
automatic extension does not occur even in the presence of the LVM profile.
```bash ```bash
$ sudo lvs -o+seg_monitor $ sudo lvs -o+seg_monitor
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert Monitor LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert Monitor
thinpool docker twi-a-t--- 95.00g 0.00 0.01 monitored thinpool docker twi-a-t--- 95.00g 0.00 0.01 not monitored
``` ```
If the output in the `Monitor` column reports, as above, that the volume is
`not monitored` then monitoring needs to be explicitly enabled. Without
this step, automatic extension of the logical volume will not occur,
regardless of any settings in the applied profile.
```bash
$ sudo lvchange --monitor y docker/thinpool
```
Double check that monitoring is now enabled by running the
`sudo lvs -o+seg_monitor` command a second time. The `Monitor` column
should now report the logical volume is being `monitored`.
12. If you have ever run Docker on this host before, or if `/var/lib/docker/` 12. If you have ever run Docker on this host before, or if `/var/lib/docker/`
exists, move it out of the way so that Docker can use the new LVM pool to exists, move it out of the way so that Docker can use the new LVM pool to
store the contents of image and containers. store the contents of image and containers.