Nginx

/etc/logrotate.d/nginx:
-----------------------
/var/log/nginx/*.log {
...
        rotate 14       <== Give an appropriate value
...
}

/var/log/nginx/*/*.log {
        daily
        missingok
        rotate 14       <== Give an appropriate value
        compress
        delaycompress
        notifempty
        create 0640 www-data adm
        sharedscripts
        prerotate
                if [ -d /etc/logrotate.d/httpd-prerotate ]; then \
                        run-parts /etc/logrotate.d/httpd-prerotate; \
                fi; \
        endscript
        postrotate
                [ ! -f /var/run/nginx.pid ] || kill -USR1 `cat /var/run/nginx.pid`
        endscript
}

The first entry (/var/log/nginx/*.log) will rotate the nginx general logs.

The second entry (/var/log/nginx/*/*.log) will rotate the logs for every web application. If we are to deploy several applications in the same server, and we require different configurations for them (e.g to copy the logs to another host), we must create different entries. One for each application.

To check that logrotate is going to rotate the logs that we want, we can run the following command:

_$: logrotate --debug /etc/logrotate.d/nginx

Note: If we enable logrotate on day D [flashback to Normandy], on day D+1 logrotate will mark that file as rotated for the last time on day D+1. On day D+2, assuming a daily rotation, the file will be rotated. On day D+6 rest from all of your work.

To check when a log file was rotated for the last time:

_$: cat /var/lib/logrotate/status

Supervisor

/etc/logrotate.d/supervisor:
----------------------------
/var/log/supervisor/*.log {
        daily
        missingok
        rotate 14
        compress
        delaycompress
        notifempty
        create 0640 root root
        postrotate
                kill -USR2 `cat /run/supervisord.pid`
                supervisorctl restart all
        endscript
}

Example: Copy the logs to another host

/etc/logrotate.d/nginx-webapp:
------------------------------
/var/log/nginx/webapp-com/*.log {
	daily
	missingok
	rotate 14
	compress
	delaycompress
	notifempty
	create 0640 www-data adm
	sharedscripts
	prerotate
		if [ -d /etc/logrotate.d/httpd-prerotate ]; then \
			run-parts /etc/logrotate.d/httpd-prerotate; \
		fi; \
		scp /var/log/nginx/webapp-com/* \
                    backupuser@devops.example.com:/srv/backup/logs/webapp/web
	endscript
	postrotate
		[ ! -f /var/run/nginx.pid ] || kill -USR1 `cat /var/run/nginx.pid`
	endscript
}

_$: ssh-copy-id -i .ssh/id_rsa.pub backupuser@devops.example.com