Fixes #727 - Add Redis Sentinel environment variables

[ralf401]

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[ralf401]

@mgruner I tried to include it in the environment variables page but decided against it. Now there is a new page in the "Appendix" section.

Additionally, I slightly rephrased the Redis section in the prerequisites and added a sentence to the already existing REDIS_URL variable in the environment variables page with a link to this new page.

Just one thing I noticed: the environment variables page says Please note that this method currently does not allow authentication for the REDIS_URL variable. However, I understood that this is possible via URL and added redis://user:[email protected] as an example to the new page for standard setups. I guess one of them is wrong?

Feel free to even suggest a complete rework... I could not really find additional information which could be useful for admins...

[mgruner]

Looks good to me!

Just one thing I noticed: the environment variables page says Please note that this method currently does not allow authentication for the REDIS_URL variable. However, I understood that this is possible via URL and added redis://user:[email protected] as an example to the new page for standard setups. I guess one of them is wrong?

Yes, I also believe that credentials can be passed in via the URL. You can try this locally with a standard Redis setup. Maybe you can get it to fail when supplying username/password if it is not needed by the redis service, maybe you have to set up the redis service with authentication first. Would be good to unify this, and remove this restriction.

[mgruner]

Looks good! Consider removing the username/password discrepancy/restriction.

[ralf401]

@mgruner Thanks! I tested it and after some hassle it worked in the docker compose stack. So I removed the part that no authentication is possible.