Sorry ahead of time, I’m still very new to Linux and Zammad. I probably messed this up myself but all your help is appreciated!
- Used Zammad version: Zammad 5.0.2
- Used Zammad installation type: (source, package, docker-compose, …)
- Operating system: CentOS 7
- Browser + version: Firefox
- Load in like normal and log in from browser.
- Getting error 502 Bad Gateway.
Steps to reproduce the behavior:
I had an update for Zammad and it needed the latest version of Postgres to install so I tried to install an updated version of Postgres. But after installing the updated Postgres version 14 I received error 502.
I have checked the Zammad.conf file and the Nginx.conf. I changed the localhost to the FQDN and that changed the error to 504. But seeing as that doesn’t seem to be the problem and nginx -t returns with okay status (besides the ssl_stapling error which apparently is from my self-signed cert).
*Zammad also updated to the latest version above. I have also found that Postgres was giving an error of the user account Zammad not having access to the database. I then gave it access and assigned it ownership but not it is still saying it can’t open a file “pg_stat_tmp/global.stat”
[root@ticketos log]# systemctl start postgresql-14
Job for postgresql-14.service failed because the control process exited with error code. See "systemctl status postgresql-14.service" and "journalctl -xe" for details.
2021-10-29 14:01:22.577 CDT  FATAL: could not open file "global/pg_filenode.map": Permission denied
2021-10-29 14:01:22.579 CDT  FATAL: could not open file "global/pg_filenode.map": Permission denied
2021-10-29 14:01:22.580 CDT  WARNING: could not open statistics file "pg_stat_tmp/global.stat": Permission denied
2021-10-29 14:01:22.590 CDT  WARNING: could not open statistics file "pg_stat_tmp/global.stat": Permission denied
I found this link: How to upgrade PostgreSQL from version 9.6 to version 10.1 without losing data? - Stack Overflow
Showing the proper way to upgrade the database from one version to the next. Which I didn’t do. Hopefully, I can still recover the original data in the previous database. According to my PG_VERSION it says it was 9.2.
I hope this can help.
I have fixed my problem. Maybe someone will be helped by this another time.
Moral of the story: ALWAYS UPGRADE POSTGRES CORRECTLY
I was running Postgresql 9.2 and the new Zammad 5.0 needs Postgresql 9.3 or higher. I have no experience with this so I simply add the repository and upgrade PostgreSQL.
After several days of errors:
Error #1: 502 when trying to access the website
Error #2: Zammad role does not exist
Error #3: database zammad_production does not exist. Can’t create a database.
Error #4: Postsql-14 failed to restart. Journalctl -xe would show zammad_websocket_1 can not connect
etc., etc. etc…Lots of errors.
After learning more and more about Postgres and how it relates to Zammad. I realize that I need to have Postgresql 9.2 in order to migrate my data. But…Postgresql doesn’t support 9.2 anymore but you need it to do the migration of your data… Days later I find out that CentOS 7 Base Repository is where you get 9.2 and before I installed Postgresql 14 I was instructed to do
exclude=postgresql* in my repository base file. I had to remove that and I was able to reinstall PostgreSQL 9.2.
Once that was installed I needed to migrate the old database data to the new folder for that I used this guideCentOS: Upgrade PostgreSQL from 9.2 to 9.6. I was going from 9.2 - 14 but it still worked with some obvious changes to the names of files.
Then after that, I was still getting the error zammad_production database does not exist. At this point, I have to apologize because I can’t remember exactly what I used to fix this but I’m pretty sure I did
su - Postgres
and then as a Postgres user, I created the zammad_production database. I will put some links that were useful to figuring this out below.
Create Database Permissions
Oh, and I did have to manually create the data folder for the new Postgresql-14 so here’s a guide for that. unable-to-start-posgtresql-the-reason-isnt-clear
Sorry if this isn’t as helpful there was a lot of forums I read and it’s a big blur. But before you upgrade PostgreSQL. Back up and then follow someone’s guide who knows what they are doing.
Great to hear that you could rule out your tricky postgresql situation.
I’m sure other users will benefit from your comprehensive sum up - thanks for providing your solution!
Thank you, a lot of the research I did had to do with things you’ve answered so you’ve definitely helped as well lol. Thanks!
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