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