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Nextcloud storage

Hello,

I have a Virtual Private Server with Ubuntu and Docker installed. I have a Nextcloud App running inside Docker and I have a problem with the Nextcloud storage.

OS: Ubuntu 20.04.2 LTS
Docker: Docker version 20.10.5, build 55c4c88
VPS size: 10 GB

The Nextcloud gives me the following error message:

It says: Your storage is full, thus no data can be updated or synchronized.

When I try to access the Nextcloud over the browser, the log in screen is available, but when I try to log in, it’s not possible to do so.

$ sudo docker system df

TYPE            TOTAL     ACTIVE    SIZE      RECLAIMABLE
Images          6         5         1.309GB   47.73MB (3%)
Containers      5         4         717.2MB   0B (0%)
Local Volumes   6         6         4.854GB   0B (0%)
Build Cache     0         0         0B        0B

$ sudo docker system df -v

Images space usage:

REPOSITORY                               TAG       IMAGE ID       CREATED       SIZE      SHARED SIZE   UNIQUE SIZE   CONTAINERS
ubuntu_proxy                             latest    aa2db9524419   3 weeks ago   47.73MB   47.73MB       55B           1
jwilder/nginx-proxy                      alpine    c27b943be747   3 weeks ago   47.73MB   47.73MB       0B            0
jrcs/letsencrypt-nginx-proxy-companion   latest    5bd467f6a856   3 weeks ago   25.66MB   0B            25.66MB       1
nextcloud                                apache    61345d6582f9   4 weeks ago   834.8MB   0B            834.8MB       1
mariadb                                  latest    1138596852f3   5 weeks ago   401MB     0B            401MB         1
hello-world                              latest    d1165f221234   7 weeks ago   13.34kB   0B            13.34kB       1

Containers space usage:

CONTAINER ID   IMAGE                                    COMMAND                  LOCAL VOLUMES   SIZE      CREATED       STATUS                   NAMES
e2f0e2128017   jrcs/letsencrypt-nginx-proxy-companion   "/bin/bash /app/entr…"   3               16.6kB    3 weeks ago   Up 3 weeks               ubuntu_letsencrypt-companion_1
2faf44c8887b   nextcloud:apache                         "/entrypoint.sh apac…"   1               717MB     3 weeks ago   Up 3 weeks               ubuntu_app_1
9db394739db3   mariadb                                  "docker-entrypoint.s…"   1               20.6kB    3 weeks ago   Up 3 weeks               ubuntu_db_1
3960054c80ab   ubuntu_proxy                             "/app/docker-entrypo…"   4               3.91kB    3 weeks ago   Up 3 weeks               ubuntu_proxy_1
4681531c9a9d   hello-world                              "/hello"                 0               0B        4 weeks ago   Exited (0) 4 weeks ago   zen_boyd

Local Volumes space usage:

VOLUME NAME                                                        LINKS     SIZE
ubuntu_nextcloud                                                   1         4.624GB
ubuntu_certs                                                       2         16.49kB
ubuntu_vhost.d                                                     2         278B
ubuntu_html                                                        2         1.106kB
5995bf51a230e50cafed67a9c1ea92de2fc7b6ed1cc2739e31fbeb5fc8acd977   1         1.525kB
ubuntu_db                                                          1         230.3MB

Build cache usage: 0B

CACHE ID   CACHE TYPE   SIZE      CREATED   LAST USED   USAGE     SHARED

My VPS has 10 GB. For me it seems that only around half of the storage inside my docker is used, but the Nextcloud volume is full. Right?

So, how can I solve my storage problem properly?
My Idea is to extend the Nextcloud volume, but I could not find how to do so. Is that possible and how can I do that?

Thank you for your help.

Greetings
cmcloud

Edit: unfortunately I was not able to post the $ sudo docker system df -v in a way that it is displayed correctly. Maybe you can tell me how to do so?