Operations grimoire/Logs - Revision history

Sandrine at 13:01, 22 November 2025

2025-11-22T13:01:43Z

← Older revision		Revision as of 13:01, 22 November 2025
Line 57:		Line 57:

	See the official documentation newsyslog.conf(5) for the definition and precautions relating to the "G" flag.		See the official documentation newsyslog.conf(5) for the definition and precautions relating to the "G" flag.

			After a log file is rotated (renamed and a new one created), many applications will not automatically start writing to the new file—they keep writing to the now-renamed (old) log file. To solve this, the application must be notified to reopen its log files. This is commonly done by sending a specific signal (not a kill -9, which forcefully terminates the process, but a well-defined signal the application knows how to handle, like SIGHUP or SIGUSR1).

			Similarly, with newsyslog (FreeBSD), it's possible to specify the path to the application's PID file and choose the appropriate signal so the daemon can close and reopen its log files after rotation.

			This mechanism ensures the application immediately starts writing to the new log file, guaranteeing complete and organized log capture

Sandrine at 12:58, 22 November 2025

2025-11-22T12:58:26Z

@@ Line 1: / Line 1: @@
-Logs are generally located in /var/log directory, but can also be in specialized systems (e.g. Docker)
+Logrotate is a utility in Linux that manages log file rotation, archiving, and deletion automatically to prevent logs from consuming all disk space. The configuration is usually placed in /etc/logrotate.conf for global settings and in /etc/logrotate.d/ for application-specific log policies
 To configure logrotate for a specific service, create a file in /etc/logrotate.d/, for example /etc/logrotate.d/nginx, and add a block describing how the log files should be rotated:
@@ Line 18: / Line 15: @@
+}
-For reference, see the full documentation:
+Logs are generally located in /var/log directory, but can also be in specialized systems (e.g. Docker)
-https://wiki.archlinux.org/title/Logrotate
+How to create a logrotate configuration (Linux)
-== Log rotation ==
+To configure logrotate for a specific service, create a file in /etc/logrotate.d/, for example /etc/logrotate.d/nginx, and add a block describing how the log files should be rotated:
 /var/log/nginx/*.log {
@@ Line 41: / Line 34: @@
      endscript
+}
-For more details, see: https://linux.die.net/man/8/logrotate

Sandrine: /* Log rotation */

2025-11-22T12:41:34Z

Log rotation

← Older revision		Revision as of 12:41, 22 November 2025
Line 27:		Line 27:
	== Log rotation ==		== Log rotation ==
	=== Logrotate (Linux) ===		=== Logrotate (Linux) ===

			To create a logrotate configuration under Linux, you simply need to create (or modify) a file in the directory /etc/logrotate.d/. Each file in this folder contains one or more sections, each describing the rotation rules for one or more log files.

			/var/log/nginx/*.log {
			daily
			rotate 7
			compress
			missingok
			notifempty
			create 640 root adm
			postrotate
			systemctl reload nginx > /dev/null
			endscript
			}
			For more details, see: https://linux.die.net/man/8/logrotate

Sandrine at 12:37, 22 November 2025

2025-11-22T12:37:10Z

← Older revision		Revision as of 12:37, 22 November 2025
Line 27:		Line 27:
	== Log rotation ==		== Log rotation ==
	=== Logrotate (Linux) ===		=== Logrotate (Linux) ===


	~~=== Newsyslog ===~~

	~~To create a configuration for newsyslog under FreeBSD, you need to add or modify a line in the main file /etc/newsyslog.confor in an auxiliary configuration file, often specific to a service.~~

	~~/var/log/www//.log root:web 640 90 * @T00 JC /var/run/nginx.pid 30~~

	~~If you're manipulating patterns with wildcards (like ), don't forget the option G. Otherwise, the system might create a literal file named ` ` or not process the files as expected.~~

	~~For a field-by-field explanation, see the man page:~~

	~~https://man.freebsd.org/cgi/man.cgi?newsyslog.conf(5)~~

	~~== References ==~~
	*

Sandrine: /* Newsyslog */

2025-11-22T12:35:21Z

Newsyslog

← Older revision		Revision as of 12:35, 22 November 2025
Line 31:		Line 31:
	=== Newsyslog ===		=== Newsyslog ===

			To create a configuration for newsyslog under FreeBSD, you need to add or modify a line in the main file /etc/newsyslog.confor in an auxiliary configuration file, often specific to a service.

			/var/log/www//.log root:web 640 90 * @T00 JC /var/run/nginx.pid 30

			If you're manipulating patterns with wildcards (like ), don't forget the option G. Otherwise, the system might create a literal file named ` ` or not process the files as expected.

			For a field-by-field explanation, see the man page:

			https://man.freebsd.org/cgi/man.cgi?newsyslog.conf(5)

	== References ==		== References ==
	*		*

Sandrine at 12:31, 22 November 2025

2025-11-22T12:31:24Z

← Older revision	Revision as of 12:31, 22 November 2025
Line 1:	Line 1:
		Logs are generally located in /var/log directory, but can also be in specialized systems (e.g. Docker)

		How to create a logrotate configuration (Linux)
		Logrotate is a utility in Linux that manages log file rotation, archiving, and deletion automatically to prevent logs from consuming all disk space. The configuration is usually placed in /etc/logrotate.conf for global settings and in /etc/logrotate.d/ for application-specific log policies.

		To configure logrotate for a specific service, create a file in /etc/logrotate.d/, for example /etc/logrotate.d/nginx, and add a block describing how the log files should be rotated:

		/var/log/nginx/*.log {
		daily
		rotate 7
		compress
		missingok
		notifempty
		create 640 root adm
		postrotate
		systemctl reload nginx > /dev/null
		endscript
		}

		How the rotation works:
		When logrotate runs (automatically via cron or manually), it checks each log file per the configuration, archives old logs, creates new ones, and triggers the specified post-rotation actions.

		For reference, see the full documentation:

		https://wiki.archlinux.org/title/Logrotate

		== Log rotation ==
		=== Logrotate (Linux) ===


		=== Newsyslog ===


		== References ==
		*

Sandrine: Blanked the page

2025-11-22T12:30:24Z

Blanked the page

← Older revision		Revision as of 12:30, 22 November 2025
Line 1:		Line 1:
	~~Logs are generally located in /var/log directory, but can also be in specialized systems (e.g. Docker)~~

	~~How to create a logrotate configuration (Linux)~~
	Logrotate is a utility in Linux that manages log file rotation, archiving, and deletion automatically to prevent logs from consuming all disk space. The configuration is usually placed in /etc/logrotate.conf for global settings and in /etc/logrotate.d/ for application-specific log policies.

	~~To configure logrotate for a specific service, create a file in /etc/logrotate.d/, for example /etc/logrotate.d/nginx, and add a block describing how the log files should be rotated:~~

	~~/var/log/nginx/*.log {~~
	~~daily~~
	~~rotate 7~~
	~~compress~~
	~~missingok~~
	~~notifempty~~
	~~create 640 root adm~~
	~~postrotate~~
	~~systemctl reload nginx > /dev/null~~
	~~endscript~~
	}

	~~How the rotation works:~~
	~~When logrotate runs (automatically via cron or manually), it checks each log file per the configuration, archives old logs, creates new ones, and triggers the specified post-rotation actions.~~

	~~For reference, see the full documentation:~~

	~~https://wiki.archlinux.org/title/Logrotate~~

	~~== Log rotation ==~~
	~~=== Logrotate (Linux) ===~~


	~~=== Newsyslog ===~~


	~~== References ==~~
	*

Sandrine: /* Web logs */

2025-11-22T12:29:17Z

Web logs

@@ Line 1: / Line 1: @@
 Logs are generally located in /var/log directory, but can also be in specialized systems (e.g. Docker)
-== Web logs ==
+How to create a logrotate configuration (Linux)
 == Log rotation ==

Dereckson: Created page with "Logs are generally located in /var/log directory, but can also be in specialized systems (e.g. Docker) == Web logs == == Log rotation == === Logrotate (Linux) === === Newsyslog === == References == *"

2025-11-22T11:35:52Z

Created page with "Logs are generally located in /var/log directory, but can also be in specialized systems (e.g. Docker) == Web logs == == Log rotation == === Logrotate (Linux) === === Newsyslog === == References == *"

New page

Logs are generally located in /var/log directory, but can also be in specialized systems (e.g. Docker)

== Web logs ==

== Log rotation ==
=== Logrotate (Linux) ===

=== Newsyslog ===

== References ==
*