I had a particularly outdated ubuntu distribution (12.10) and was beginning the process to update sequentially to 16.04. Yesterday, I successfully updated from 12.10->13.10->14.04 using the Ubuntu old releases archive and this tutorial from Digital Ocean. I didn’t have to change the kernel, because our droplet was using grubloader v2.0.
Excited at the success of updating, I used do-release-upgrade to move from 14.04 to 16.04 and, while the distribution was updated successfully, I immediately ran into 502 errors (nginx /1.4.6) after updating. I am new to all of this, so I did the release upgrade from 14.04 to 16.04 in the exact same way as the 13.10->14.04 upgrade.
When I try to access the nginx error logs, I get a “Permission denied” reading. First question: How do I access the error logs? Second question (dependent on what the error logs might or might not show): has anyone run into this problem when updating from 14.04->16.04? Also, I restored my droplet back to 12.10 and updated back to 14.04 and I am now running into the same 502 errors, despite the 14.04 update working fine previously.
Here is the “Permission denied” code:
Welcome to Ubuntu 14.04.5 LTS (GNU/Linux 3.13.0-143-generic i686)
* Documentation: https://help.ubuntu.com/
New release '16.04.4 LTS' available.
Run 'do-release-upgrade' to upgrade to it.
Last login: Wed Mar 21 12:34:48 2018 from c-73-205-79-49.hsd1.fl.comcast.net
root@foss:~# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 14.04.5 LTS
Release: 14.04
Codename: trusty
root@foss:~# /var/log/nginx/error.log
-bash: /var/log/nginx/error.log: Permission denied
root@foss:~#
This textbox defaults to using Markdown to format your answer.
You can type !ref in this text area to quickly search our full set of tutorials, documentation & marketplace offerings and insert the link!
These answers are provided by our Community. If you find them useful, show some love by clicking the heart. If you run into issues leave a comment, or add your own answer to help others.
Get our biweekly newsletter
Sign up for Infrastructure as a Newsletter.
Hollie's Hub for Good
Working on improving health and education, reducing inequality, and spurring economic growth? We'd like to help.
Become a contributor
Get paid to write technical tutorials and select a tech-focused charity to receive a matching donation.
root@foss:~#
/var/log/nginx/error.logshould be something more like
root@foss:~#
cat /var/log/nginx/error.logHi there,
Just came across this question in 2020. Here are some suggestions for anyone who might need this:
Here is a link to an answer on how to troubleshoot common Nginx problems:
https://www.digitalocean.com/community/questions/how-to-troubleshoot-common-nginx-issues-on-linux-server
And here is also a quick video demo on how to do that as well:
Regards, Bobby
I have the same problem but still with no success, when I type
cat /var/log/nginx/error.logI getcat: /var/log/nginx/error.log: Permission deniedI think the problem is the user of the folder, is not root, is
www-data:shows
what is this user? how can I solve, I can not access with sudo (root user)
thanks