How to view nginx log on Centos (docker)?
I get 502, 504 Nginx Gateway errors, so I want to see nginx log.
Can you tell me command line, how to view nginx log on Centos (docker)?
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In a discussion titled ‘How to view nginx log inside Discourse?’ under the Installation category, hokod seeks help viewing nginx logs on CentOS (Docker) due to 502/504 gateway errors. Simsnet advises entering the Docker container shell via ./launcher enter app, then navigating to /var/log/nginx to view error.log using nano. However, hokod reports the directory doesn’t exist. After checking /var/log contents, pfaffman suggests the logs are at /var/discourse/shared/standalone/logs/var-log/nginx, but hokod still encounters errors. Simsnet corrects the path to /var/discourse/shared/standalone/log/var-log/nginx (note: singular ‘log’ not ‘logs’), which resolves the issue for them. MikeNolan adds that running nginx -V inside the container can reveal the actual log file paths configured for nginx. The key takeaway is that nginx logs in Discourse Docker are not in the container’s /var/log/nginx, but rather mapped to the host at /var/discourse/shared/standalone/log/var-log/nginx.
Discourse runs inside a Docker container, which is essentially like a virtual machine. All components are self-contained so it is rather difficult to lose anything. To see the logs that the NGINX server produces, such as access and error, you’ll need to go to the logs folder inside the container’s shell.
Exercise caution while inside the shell, as this can break your instance.
Enter your container’s shell using these commands. You can skip su - if you’re already root.
su -
cd /var/discourse
./launcher enter app
cd /var/log/nginx
Open the file error.log in your preferred terminal text editor (I prefer nano only because I’m not an expert, you’ll need to install it first).
nano error.log
Locate the last line (the latest entry) of the file by pressing ^V (CTRL-V). When finished, press ^X to return to shell.
When finished, run exit to return to your CentOS root shell.
I got this error when I followed your instructions
-bash: cd: /var/log/nginx: No such file or directory
Go to the /var/log directory and reply with the results of the ls command.
I did as you instructed, returned the following results,
What do I do next to see the nginx log?
[root@45 discourse]# cd /var/log/
[root@45 log]# ls
anaconda cron-20211101 maillog-20211017 ppp spooler-20211024
audit cron-20211107 maillog-20211024 rhsm spooler-20211101
boot.log dmesg maillog-20211101 secure spooler-20211107
btmp dmesg.old maillog-20211107 secure-20211017 tallylog
btmp-20211101 firewalld messages secure-20211024 tuned
chrony grubby messages-20211017 secure-20211101 wtmp
cron grubby_prune_debug messages-20211024 secure-20211107 yum.log
cron-20211017 lastlog messages-20211101 spooler yum.log-20200101
cron-20211024 maillog messages-20211107 spooler-20211017 yum.log-20210114
See
/var/discourse/shared/standalone/logs/var-log/nginx
i did like you, but i still get the error:
[root@45 var-log]# cd /var/discourse/shared/standalone/logs/var-log/nginx
-bash: cd: /var/discourse/shared/standalone/logs/var-log/nginx: No such file or directory
[root@45 var-log]# /var/discourse/shared/standalone/logs/var-log/nginx
-bash: /var/discourse/shared/standalone/logs/var-log/nginx: No such file or directory
What if you do an ls in the var-log directory that you are in?
Try it again, but replace the folder logs with log, like below. I also got the error on my machine.
/var/discourse/shared/standalone/log/var-log/nginx
This is an old topic, but running nginx -V inside the container should indicate where nginx’s log files are.