Manual:Backing up a wiki/it

È importante effettuare regolari backups dei dati del proprio wiki (dati e file). Questa pagina fornisce una panoramica del processo di backup per un wiki MediaWiki tipico; probabilmente si vorrà ideare un proprio script di backup o un programma per adattarlo alle dimensioni del wiki e alle proprie esigenze individuali.

Panoramica
MediaWiki memorizza i dati importanti in due luoghi:
 * Database: pagine ed i loro contenuti, utenti e le loro configurazioni, metadata, indici di ricerca, etc.
 * File system: files di configurazione del software, skins personalizzate, estensioni, immagini (incluse immagini cancellate), etc.

Occorre mettere il wiki in modalità read-only (solo-lettura) prima di creare il backup - vedi. Questo garantirà che tutte le parti del proprio backup siano consistenti (alcune delle estensioni installate possono scrivere dati).



Trasferimento file
Occorrerà scegliere un metodo per il trasferimento dei files dal server di partenza:


 * I dati non privati si possono semplicemente pubblicare su archive.org e/o in una directory  del proprio server web.
 * SCP (o WinSCP), SFTP/FTP o altri protocolli di trasferimento dati di propria scelta.
 * La società di hosting di norma fornisce un file manager utilizzabile da una interfaccia via browser web, verificare con il proprio provider.

Database
La maggior parte dei dati critici del wiki è memorizzata nel database. Quando si usa il backend predefinito MySQL o MariaDB, il database può essere scaricato in un file di script che può essere usato in seguito per ricreare da zero il database e tutti i dati in esso contenuti.

Automysqlbackup
Vedere il pacchetto in Debian:

Installare il pacchetto:

Tutto il tuo database sarà salvato in /var/lib/automysqlbackup/:

Backup manuale:

Ripristinare un database:

Per altre distribuzioni, vedere su Sourceforge.



Mysqldump dalla linea di comando
Il modo più comodo per creare un file di dump del database di cui si vuole fare il backup è usare lo strumento standard di dump di MySQL mysqldump dalla riga di comando. Assicuratevi di aver impostato correttamente i parametri o potreste avere difficoltà a ripristinare il database. A seconda delle dimensioni del database, mysqldump potrebbe richiedere un tempo considerevole.

First insert the following line into LocalSettings.php

this can be removed as soon as the dump is completed.

Esempio del comando ad eseguire nella shell di Linux/UNIX:

mysqldump -h hostname -u userid -p --default-character-set=whatever dbname > backup.sql

Substituting,  ,  , and   as appropriate. Tutti e quattro si possono trovare nel tuo file (LSP). may be found under ; by default it is localhost. may be found under,  may be found under , where it is listed after. If  is not specified mysqldump will likely use the default of utf8, or if using an older version of MySQL, latin1. While  may be found under. After running this line from the command line mysqldump will prompt for the server password (which may be found under in LSP).

See mysqldump for a full list of command line parameters.

The output from mysqldump can instead be piped to gzip, for a smaller output file, as follows

mysqldump -h hostname -u userid -p dbname | gzip > backup.sql.gz

Some newer versions of MySQL might show an error about tablespaces and PROCESS privilege. MediaWiki does not use tablespaces. The solution is to add the --no-tablespaces option to the command:

mysqldump --no-tablespaces -h hostname -u userid -p dbname | gzip > backup.sql.gz

A similar mysqldump command can be used to produce XML output instead, by including the --xml parameter.

mysqldump -h hostname -u userid -p --xml dbname > backup.xml

and to compress the file with a pipe to gzip

mysqldump -h hostname -u userid -p --xml dbname | gzip > backup.xml.gz

Remember to also backup the file system components of the wiki that might be required, e.g., images, logo, and extensions.



Avviare mysqldump con Cron
Cron is the time-based job scheduler in Unix-like computer operating systems. Cron enables users to schedule jobs (commands or shell scripts) to run periodically at certain times or dates.

A sample command that you may run from a crontab may look like this:  nice -n 19 mysqldump -u $USER --password=$PASSWORD $DATABASE -c | nice -n 19 gzip -9 > ~/backup/wiki-$DATABASE-$(date '+%Y%m%d').sql.gz The  lowers the priority of the process.

Use valid values for,  , and. This will write a backup file with the weekday in the filename so you would have a rolling set of backups. If you want to save the files and extensions as well, you might want to use this one.

If you want to add this task in Cron through Cpanel then you must escape the character "%"

/usr/bin/mysqldump -u $USER --password=$PASSWORD $DATABASE -c | /bin/gzip > ~/backup/wiki-$DATABASE-$(date '+\%Y\%m\%d').sql.gz

or you will get an error:

/bin/sh: -c: line 0: unexpected EOF while looking for matching `'' /bin/sh: -c: line 1: syntax error: unexpected end of file

Tabelle
Some of the tables dumped have different degrees of temporariness. So to save disk space (beyond just gziping), although those tables need to be present in a proper dump, their data does not. However, under certain circumstances the disadvantage of having to rebuild all this data may outweigh saving disk space (for example, on a large wiki where restoration speed is paramount).

See mailing list thread mysql5 binary schema about the topic.



Conversione da Latin-1 a UTF-8
See the relevant section of the upgrading page for information about this process. Also see the talk page for more information about working with character sets in general.

PostgreSQL
You can use the  tool to back up a MediaWiki PostgreSQL database. For example:

pg_dump mywiki > mywikidump.sql

will dump the  database to mywikidump.sql.

To restore the dump:

psql mywiki -f mywikidump.sql

You may also want to dump the global information, e.g. the database users:

pg_dumpall --globals > postgres_globals.sql

phpMyAdmin
Turn your wiki to read only by adding  to LocalSettings.php.

Open the browser to your phpadmin link, login, choose the wiki database. (Check LocalSettings.php if you're not sure). Select Export. Make sure all items under Export are highlighted, and make sure Structure is highlighted (it's important to maintain the table structure). Optionally check Add DROP TABLE to delete existing references when importing. Make sure Data is checked. Select zipped. Then click on GO and save the backup file. Remove  from LocalSettings.php

Remember to also backup the file system components of the wiki that might be required, e.g. images, logo, and extensions.



Collegamenti esterni

 * For a tutorial, see Siteground: MySQL Export: How to backup a MySQL database using phpMyAdmin
 * Backing up the Database

HeidiSQL
HeidiSQL is similar to phpMyAdmin, but without any restrictions of phpMyAdmin's free version. HeidiSQL requires a direct database connection, where some hosts may only offer web interfaces (phpMyAdmin) to firewalled databases.



Filesystem
MediaWiki stores other components of the wiki in the file system where this is more appropriate than insertion into the database. The most important of these are and uploaded files in the   directory (including deleted files, thumbnails, and rendered math and SVG images, if applicable).

The best method to back these up is to place them into an archive file, such as a  file, which can then be compressed if desired. On Windows, applications such as WinZip or 7-zip can be used.

For Linux variants, assuming the wiki is stored in

It should be possible to backup the entire "wiki" folder in "htdocs" if using XAMPP.

Configuration files
LocalSettings.php is the most important of these, but a wiki might also have things like  or other web server configuration files that should be backed up.

Uploaded files
Files uploaded to the wiki are by default put into the  directory, separated into subdirectories such as. There are also other directories such as  and. These should all be backed up.

The  can be backed up along with everything else, but can optionally be excluded in order to save backup space. This directory stores the derived thumbnails of images and other files; generally multiple thumbnails per wiki file. After restoring from backup, these thumbnails will be recreated as required (although depending on this may need to be a manual process).



Backup del contenuto del wiki (dump XML)
It is also a good idea to create an XML dump in addition to the database dump. XML dumps contain the content of the wiki (wiki pages with all their revisions), without the site-related data (they do not contain user accounts, image metadata, logs, etc).

XML dumps are less likely to cause problems with character encoding, as a means of transferring large amounts of content quickly, and can easily be used by third party tools, which makes XML dumps a good fallback should your main database dump become unusable.

To create an XML dump, use the command-line tool, located in the   directory of your MediaWiki installation. See for more details.

You can also create an XML dump for a specific set of pages online, using Special:Export, although attempting to dump large quantities of pages through this interface will usually time out.

To import an XML dump into a wiki, use the command-line tool. For a small set of pages, you can also use the Special:Import page via your browser (by default, this is restricted to the sysop group).

'' See for more information. ''



Accesso al server senza shell
If you have no shell access, use the WikiTeam Python script dumpgenerator.py from a DOS, Unix or Linux command-line. Requires Python v2. Mediawiki Client Tools are developing Mediawiki Scraper, a Python 3.x port.

User account information won't be preserved. The XML dump can include full or only most recent page history. The images dump will contain all file types with associated descriptions. The siteinfo.json and SpecialVersion.html files will contain information about wiki features such as the installed extensions and skins.

Full instructions are at the WikiTeam tutorial and Mediawiki Scraper GitHub repositories.

See also Data dumps.

Scripts
Script does not need to be modified for each site to be backed up. Does not (yet) rotate old backups. Usage:. Also provides a script to restore a backup. Can be used with Windows task scheduler.
 * Unofficial backup script by User:Duesentrieb.
 * Unofficial backup script by Flominator; creates a backup of all files and the database, with optional backup rotation.
 * User:Darizotas/MediaWiki Backup Script for Windows - a script for backing up a Windows MediaWiki install. Note: Has no restore feature.
 * WikiTeam tools - if you do not have server access (e.g. your wiki is in a free wikifarm), you can generate an XML dump and an image dump using WikiTeam tools (see some saved wikis).
 * Another backup script that: dumps DB, files (just pictures by default, option to include all files in installation), and XML; puts the site into read-only mode; timestamps backups; and reads the charset from LocalSettings.
 * Another unofficial by Lanthanis that: exports the pages of specified namespaces as an XML file; dumps specified database tables; and adds further specified folders and files to a ZIP backup file.
 * Script to make periodical backups mw_backup. This script will make daily, weekly and monthly backups of your database and images directory when run as a daily cron job.

Extensions

 * – Allows users to generate and download database dumps
 * – Allows users to generate and download XML and file/image dumps



Vedi anche

 * Help:Export is a quick and easy way to save all pages on your wiki.
 * — if you don't have a successful backup
 * — if you don't have a successful backup
 * — if you don't have a successful backup
 * — if you don't have a successful backup