Docker push to remote registry consumes local devicemapper storage capacity #32644
Description
Once I push to remote registry an images which does not exists there, for an unknown reason the local thinpool capacity shrink.
Not sure why does it happen - I do see
[Sun Apr 16 13:27:21 2017] XFS (dm-48): Unmounting Filesystem
[Sun Apr 16 13:27:22 2017] XFS (dm-48): Mounting V4 Filesystem
[Sun Apr 16 13:27:22 2017] XFS (dm-48): Ending clean mount
[Sun Apr 16 13:27:24 2017] XFS (dm-48): Unmounting Filesystem
in dmesg - so I guess docker is doing something on the local storage.
Would like to get an explanation. What am I missing?
[root@stratonode0 ~]# docker info
Containers: 34
Running: 34
Paused: 0
Stopped: 0
Images: 39
Server Version: 1.10.3
Storage Driver: devicemapper
Pool Name: inaugurator-docker_thinpool-tpool
Pool Blocksize: 524.3 kB
Base Device Size: 10.74 GB
Backing Filesystem: xfs
Data file:
Metadata file:
Data Space Used: 25.96 GB
Data Space Total: 26.84 GB
Data Space Available: 878.7 MB
Metadata Space Used: 13.75 MB
Metadata Space Total: 1.074 GB
Metadata Space Available: 1.06 GB
Udev Sync Supported: true
Deferred Removal Enabled: false
Deferred Deletion Enabled: false
Deferred Deleted Device Count: 0
Library Version: 1.02.93-RHEL7 (2015-01-28)
Execution Driver: native-0.2
Logging Driver: json-file
Plugins:
Volume: local
Network: bridge null host
Kernel Version: 3.10.0-327.10.1.el7.x86_64
Operating System: CentOS Linux 7 (Core)
OSType: linux
Architecture: x86_64
CPUs: 12
Total Memory: 62.32 GiB
Name: XXXX
ID: 4AS5:G6YJ:YQUT:T3CC:PG4B:2BLJ:ZKH5:GJEM:BJHC:P6FO:C2SU:ZDG5