Question Unable to write to /var/www/data

Hello,
I am attempting to copy my current install to a new server. 
The new server is a docker container on Nginx, per the following steps:
GitHub - richardeigenmann/Webtrees-Docker: Run webtrees Genealogy in 3 Docker containers

The setup runs fine until I get the following error:

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/var/www/data
Oops! webtrees was unable to create files in this folder. This usually means that you need to change the folder permissions to 777.
=============================================

No mater if I do as indicated, the error persists preventing the installation. I've also tried to change ownership of the folder to www-data, still with no avail.
I can tell webtrees is able to create the file "test.txt", a zero-length file that remains there until I manually delete it, but it seems like it's unable to write to it or delete it. What could be causing this issue?

I also get the warning:
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The PHP extension "exif" is not installed.
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But I'm not sure if it could be related to the issue stated above.

Thank you for your guidance.


 

One additional piece of information:
The only out of the ordinary thing that called my attention is that instead of using the "Webtrees-Data" volume I created per the instructions, the script creates a new one named "webtrees-docker_webtrees-data" and seems to bind the container to this volume instead.

I have no significant experience of docker, but if

> I've also tried to change ownership of the folder to www-data, still with no avail.

then it is possible that this is a read-only filesystem.

Perhaps with docker you must create a read-write filesystem for your persistent data, and mount it at that point?

Oh no... I wrote a lengthy response only to find out upon submittal that my session had expired.

In short, I'd try this setup: github.com/NathanVaughn/webtrees-docker

What I see is that two out of the three containers download the webtrees distribution zip and unzip it into the same location. I think there's already a rudimentary data folder in there, so whatever container was first will be the owner.

Also you can try to copy the line containing "chmod 777 /var/www/data" from Dockerfile-php into the Dockerfile (of the nginx container) which does the same as what's described in the readme at the bottom of the shell commands code snippet:

Code:

# If you get an error about the permissions log into the container and correct them docker exec -it Webtrees_webserver bash root@827bbf76cde7:/# chmod 777 /var/www/data

bertkoor wrote:

Oh no... I wrote a lengthy response only to find out upon submittal that my session had expired.

I appreciate your time and effort. I'll check your suggestions and will let you know.
So far, I've tried mounting the whole volume /var/www/data/ into another drive and it can write now, but I'm having some issues connecting to the DB.
I'll give the Nathan Vaughn setup a try....