dsmr docker 2.5GB when exporting

[hemant5400z]

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Description

Hi,

Im moving my docker to another server hence exporting both dsmr and dsmrdb. I noticed that dsmr docker is almost 2.5 GB. Expected the dsmrdb to be large as it contians the database but is uses the volume mapping to store the DB.

What I don't understand why the dsmr docker is that large as it does not contain any data only the configs. I also deleted the backupdir contents to be sure the issues was not there but still the dsmr docker is 2.5 GB not sure what it storing there.

Can someone help me to understand /cleanup this docker?

Expected behaviour

dsmr should be small similar approx 300-400 MB.

Actual behaviour

The dsmr docker has grown to a huge beast 2.5 GB when exporting.

Steps to reproduce

Export docker from Synology docker panel.

Docker info

Server:
 Containers: 10
  Running: 7
  Paused: 0
  Stopped: 3
 Images: 17
 Server Version: 20.10.3
 Storage Driver: btrfs
  Build Version: Btrfs v4.0
  Library Version: 101
 Logging Driver: db
 Cgroup Driver: cgroupfs
 Cgroup Version: 1
 Plugins:
  Volume: local
  Network: bridge host ipvlan macvlan null overlay
  Log: awslogs db fluentd gcplogs gelf journald json-file local logentries splunk syslog
 Swarm: inactive
 Runtimes: io.containerd.runc.v2 io.containerd.runtime.v1.linux runc
 Default Runtime: runc
 Init Binary: docker-init
 containerd version: b1dc45ec561bd867c4805eee786caab7cc83acae
 runc version: 89783e1862a2cc04647ab15b6e88a0af3d66fac3
 init version: 12b6a20 (expected: de40ad0)
 Security Options:
  apparmor
 Kernel Version: 3.10.105
 OSType: linux
 Architecture: x86_64
 CPUs: 2
 Total Memory: 1.961GiB
 Name: HAGPAZ1-S-05
 ID: WYNU:4ZHT:AUDS:DN5A:G7N6:NVZS:TJCN:4NUF:GKWI:MU73:4AYY:THNS
 Docker Root Dir: /volume1/@docker
 Debug Mode: false
 Registry: https://index.docker.io/v1/
 Labels:
 Experimental: false
 Insecure Registries:
  127.0.0.0/8
 Live Restore Enabled: false

Version

• Docker compose version (type docker-compose --version):

• docker-compose version 1.28.5, build 1bbbad71

• System info (type uname -a): Linux 3.10.105 #25426 SMP Tue May 12 04:40:16 CST 2020 x86_64 GNU/Linux synology_bromolow_3615xs

Docker compose

not sure if this is relevant

Container logs

not sure if this is relevant

Additional info

No response

[xirixiz]

Hi, do you run a db cleanup regulary? I run it each time the container starts (enabled it by default). You can find more in the "features" section: https://github.com/xirixiz/dsmr-reader-docker#features

Depending on old and unused data, this process might take some time.

[xirixiz]

Sorry, didn't read properly. There's actually nothing interesting to backup from the dsmr container. See the backup/restore options in the section: https://github.com/xirixiz/dsmr-reader-docker#features.

The reason dsmr data is big is that dsmr also creates db backups on a scheduled base (for each day of the week one backup if I`m not mistaken). You can find it as the mounted volume in you docker-compose file for the dsmr container, it most probably contains the word "backup" :)

[hemant5400z]

Hi,

I know there is a backup volume, however when exporting a container, the volume data is not exported ( I assume) but so be sure I deleted all the backups in the volume but still the container was claiming 2.5 gb export data.

Hemant

[xirixiz]

Hi,

I need to have some more details on this in order to help out.

• What is the reason for exporting the container (it usually doesn't make sense to export a container)?
• Can you share the output of docker ps -a | grep dsmr and docker images | grep dsmr?

I noticed you're using the Synology UI to export a container. I`m not sure what's happening in the background then. Perhaps you can export it manually and see if there's a difference in size.

docker export dsmr > dsmr.tar. When I export the image like that, the size doesn't exceed 100mb.

-rw-r--r-- 1 root root 99M Aug 29 08:52 dsmr.tar

Maybe you can also share your settings for spinning up a container (docker-compose.yml?)?

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