Manual:Upgrading/el



Βασική επισκόπηση


Μεταφορά αρχείων
Επιλέξτε μέθοδο για μεταφορά αρχείων:


 * wget
 * Ασφαλές αντίγραφο με SCP ή WinSCP
 * Πρωτόκολλο Μεταφοράς Αρχείων SSH (SFTP)
 * Χρήση εξυπηρετητή FTP.
 * Η εταιρεία φιλοξενίας μπορεί να παρέχει κάποια διεπαφή διαχειριστή αρχείων μέσω των προγραμμάτων περιήγησης ιστού. Επικοινωνήστε με τον πάροχό σας.
 * Κάποια άλλη μέθοδος. Υπάρχει μια λίστα από τέτοιες στη σελίδα List of file transfer protocols

Προκαταρκτικά
Διαβάστε.


 * 1) Ελέγξτε τις απαιτήσεις
 * 2) Διαβάστε το αρχείο RELEASE-NOTES
 * 3) Διαβάστε το αρχείο UPGRADE
 * 4) Πάρτε αντίγραφα ασφαλείας των υπαρχόντων αρχείων και της βάσης δεδομένων
 * 5) Αποσυμπιέστε τα νέα αρχεία
 * 6) Αναβαθμίστε τις επεκτάσεις
 * 7) Εκτελέστε τη δέσμη ενεργειών ενημέρωσης για να ελέγξετε την βάση δεδομένων
 * 8) Δοκιμάστε την ενημερωμένη έκδοση
 * 9) Αφαιρέστε υπολείμματα από παλιές εγκαταστάσεις



Ελέγξτε τις απαιτήσεις
Το MediaWiki απαιτεί:


 * PHP +
 * Κάποιο από τα ακόλουθα:
 * MariaDB +
 * MySQL +
 * PostgreSQL +
 * SQLite +

Αν χρησιμοποιείτε PostgreSQL, παρακαλούμε διαβάστε επίσης το.

Για περισσότερες πληροφορίες, παρακαλούμε διαβάστε το και το.



Διαβάστε τις σημειώσεις έκδοσης
Εντός του συμπιεσμένου αρχείου της διανομής, ή εντός των εξαχθέντων αρχείων από το Git, υπάρχει ένας αριθμός από αρχεία με ονόματα σε κεφαλαία, το ένα εκ των οποίων περιέχει τις  (σημειώσεις έκδοσης) (wiki). Τώρα είναι η ώρα να το ανοίξετε και να μάθετε τι έχει αλλάξει σε αυτήν την έκδοση. You should also read the instructions in the UPGRADE file.



Απαλείψτε τις εκκρεμείς εργασίες
Για λόγους επιδόσεων, ορισμένες ενέργειες στη βάση δεδομένων καθυστερούνται, και η διαχείρισή τους γίνεται από την ουρά εργασιών. Αυτές οι εργασίες αποθηκεύονται στη βάση δεδομένων και περιέχουν παραμέτρους με πληροφορίες σχετικά με τις ενέργειες που πρέπει να εκτελεστούν. Συνιστάται θερμά να εκτελέσετε αυτές τις εκκρεμείς εργασίες πριν από την αναβάθμιση του wiki, για την αποφυγή αποτυχία τους σε περίπτωση που οι προδιαγραφές των παραμέτρων αυτών των εργασιών έχουν αλλάξει στη νέα έκδοση. Χρησιμοποιήστε το για να τρέξετε όλες τις εκκρεμείς εργασίες και να καθαρίσετε την ουρά πριν από την εκτέλεση της αναβάθμισης.



Πάρτε αντίγραφα ασφαλείας των υπαρχόντων αρχείων και της βάσης δεδομένων

 * Full instructions: 

While the upgrade scripts are well-maintained and robust, things could still go awry. Before proceeding to update the database schema, make a full backup of the wiki, including both the database and the files:


 * the wiki's content, from the database, (make sure you get the character set specified correctly, first check LocalSettings.php). It may be a good idea to create an XML dump in addition to the SQL database dump.
 * MySQL, both SQL dump and XML dump are for use with the  command:

mysqldump --user=wikidb_user --password=wikidb_userpassword wikidb > file.sql mysqldump --user=wikidb_user --password=wikidb_userpassword wikidb --xml > file.xml
 * PostgreSQL, database dump for use with  command:

pg_dump --create -Fc wikidb > file.db.dump
 * SQLite, you use a MediaWiki script for making a backup:

php wikifolder/maintenance/sqlite.php --backup-to file
 * images and other media files (the contents of the  directory, custom logo /skins/common/images/wiki.png)
 * configuration files, e.g.  and   (if present)
 * MediaWiki's program files, including all skins and extensions, especially if you modified them.

Using a tarball package
You can put the new files into place using FTP or the command line. Use the command line, if you have access to it! Using the command line will be much faster than having to upload each single one of the thousands of files via FTP.

FTP or graphical
If you cannot access the command line on your server, download the MediaWiki tarball to your local computer and use 7zip to extract the tarball on your local PC.

After you extracted the files locally, use your favorite FTP client software to upload directories and files to the server.

cPanel File Manager
cPanel is a popular interface provided by many web hosts. This method is efficient because the files are uncompressed on the server itself.


 * Navigate to the directory that holds your wiki folder.
 * Upload the mediawiki-1.xx.x.tar.gz file. You may need to hit "Reload" to see it.
 * Extract the mediawiki-1.xx.x.tar.gz file. Reload again.
 * Confirm that the mediawiki-1.xx.x folder is present.
 * Delete the tar.gz file.
 * Copy all necessary skins, extensions, image folders, customizations, and the LocalSettings.php into the new folder. (See below.)
 * When you are ready to run update.php, rename your old wiki folder and your new wiki folder. (e.g. "w" becomes "w1.34" and then "mediawiki1.35.0" becomes "w".) This step is easily reversible if you run into problems.



Γραμμή εντολών
You may need to run the command as  if you don't have full write permissions to the wiki install directories under your current user. When untarring a tarball package normally a new directory for the new wiki version will be created and you will have to copy the old configuration files and images directory from your old installation directory:

(Open)Solaris users should use gtar, or:

$ gzip -dc mediawiki-.tar.gz | tar xf -



Άλλα αρχεία
After extracting the tarball, you should copy or move some files and folders from the old installation directory to the new one:
 * - contains your old configuration settings.
 * The  (or   in older versions) directory, which contains all the uploaded files to the wiki, unless you have chosen a different upload directory, and change the ownership and permissions.   and   (e.g. if your web user is apache).
 * Some extensions in the  directory. You should always get updated extensions; old extensions aren't guaranteed to work with a newer version of MediaWiki.
 * In case you use a custom logo this file also needs to be restored from backup. Before 1.24 the logo is usually in . After 1.24 the logo is usually in   or   if that's what you chose to use. Then add to LocalSettings.php e.g.
 * For 1.35 you may need to restore the logos from . Then add to LocalSettings.php e.g.
 * Custom skins from within the  directory.
 * Any modifications made to the old installation files or extensions.
 * Any .htaccess file (if you're using Apache and you've defined any rules in them).

Once done, make this new folder the published folder on the web server, or rename the old installation directory and then rename the new one to match the old name. Change ownership and group of everything so the web server has access to the files.



Χρησιμοποιώντας το Git
If using, export the files into a clean location, and then copy the old customized files into the new location as described in the previous section.

You will also need to install some external PHP libraries using Composer or a provided collection maintained for the Wikimedia wiki farm. More details on installing and updating external libraries can be found in the Git download documentation.

Using patch
A small patch file is usually made available for a minor version upgrade. You'll need to download patch to use this. Manually download and extract the patch file from the dumps site or follow the directions with wget below. Patches are incremental, you can not  skip a version.


 * 1) cd to your main MediaWiki directory (the one with LocalSettings.php).
 * 1) Download the patch file and gunzip it.
 * 1) Use   to check what will be changed (e.g.,  )
 * 1) If all is well, run patch again without.
 * 1) Check your Special:Version and you should see the new version number in place.



Εναπομείναντα αρχεία που μπορεί να προκαλέσουν σφάλματα
If you unpacked over the old installation directory, some old files can cause problems with the new version.



Αναβαθμίστε τις επεκτάσεις
Certain extensions have been updated in order to work with the new version of MediaWiki. Be sure to upgrade to the latest versions of such extensions. You might need to perform manual updates to custom extensions.

Different tarballs include some subsets of extensions and have versioning which helps you upgrade choosing the right one for your MediaWiki core release.

Extension Distributor works well for most people who want a snapshot of extensions that will work with their supported versions of MediaWiki.

If you want a lot of extensions then downloading from Git is probably best. If you don't have Git but you want to upgrade a lot of extensions, you might consider using mwExtUpgrader.



Προσαρμόστε το LocalSettings.php σας
If you use the same  from the old version, you may need to adapt it to how new versions handle it:

Skin registration
Since MediaWiki 1.24, bundled skins like Vector, Monobook, Modern and CologneBlue are no longer part of MediaWiki core, and they need to be registered explicitly in  to use them, otherwise MediaWiki will warn that you don't have installed skins.

This is what you need to add to  when upgrading from versions older than 1.24 and want to have available one of those skins:

Other skins may still not be adapted to the new skin registration system, so refer to the documentation page about each skin to see how to register it properly in case of problems.

Extension registration
Since MediaWiki 1.25, extensions use a new extension registration system.

Previously your  would include something like:

This can be converted to:

Extensions are being adapted to use the new extension registration system. Extensions that are not adapted should use the old way of installing them. Refer to the installation instructions on the extension's page for more information.

Remove DefaultSettings.php line (if necessary)
Older versions of MediaWiki automatically generated a line in LocalSettings.php calling. As of Version 1.38, this line is deprecated and does not work with many extensions. It needs to be removed.

Delete the following line:



Άλλες μεταβλητές
Some variables may be obsolete or even removed. Having them in  usually won't have any effect. New variables may be added in newer versions, or some existing variables changed their type. We usually try to use sane defaults for them, and in case of type change, be backward compatible. In any case, take a look at the release notes to see those changes.



Εκτελέστε τη δέσμη ενεργειών ενημέρωσης
You can upgrade the MediaWiki database in two ways: Either from the command line or from the web browser. If you have shell access to your server, upgrading from the command line is recommended, since this reduces the risk of the upgrade process being interrupted by a timeout or connection reset.

The script will also notify you if any of MediaWiki core's PHP dependencies are out of date.



Γραμμή εντολών
Access the command line of your server or an SSH shell or similar. You can access the command line by connecting to your server via SSH. If the local PC you are working on runs Microsoft Windows, you will need a tool like PuTTY to use SSH. From the command line or the Shell, change to the  directory and execute the update script:

$ php update.php

On a Linux server if you get an error, try performing the same command as root ( sudo php update.php ). Note for simple installations on Windows (e.g. with ): First make sure that your web server (such as Apache) and your database (such as MySQL) are running. Then run : right-click it, select Open With, and browse to PHP.exe. The resulting command prompt window will likely autoclose when the schema upgrade completes.

You might see a message that your PHP version is too old and that MediaWiki needs a newer version. After that message, the update aborts. Reason for this error is that the command line can use another PHP version than that one which you have when you execute MediaWiki from the web server. When you get this message you should check, if you can execute a newer PHP version on the shell by using a different command: That might e.g. be php5 or php56. If another version is available and - if so - under which name, depends on the setup of your server. If it does not work, ask your hoster; they will surely know.

MediaWiki will inspect the existing schema and update it to work with the new code, adding tables and columns as needed.

What to do if php update.php fails to do anything, resulting in a quick pause and then return to command prompt
This can be caused by a malfunctioning extension or skin.

If this causes update.php to work, uncomment half of that half (so 1/4 of the extensions). If this does NOT cause update.php to work, uncomment the first half but comment out the second half, and then comment out half of the second half, etc. Repeat until update.php works to find the one that is failing.
 * Check that all extensions and skins called for in LocalSettings.php are present
 * Check that extensions are using the correct registration method (wfLoadExtension vs. require_once)
 * Comment out the first half of the extensions in LocalSettings.php.

What to do in case of "ALTER command denied to user" error (or similar)
In case the scripts abort with a message similar to:

Error: 1142 ALTER command denied to user 'wiki'@'localhost' for table 'mytable' (localhost) ERROR: must be the owner of the mytable relation

This means that you should check that you have defined and  in your  file (in the main directory). These are the user and password needed by this script in order to access to the database.

In some cases, an old $wgDBmwschema variable (for Postgres) seems to be read for the table name to update instead of $wgDBname, even when MySQL is used. If this is the case, just get rid of the $wgDBmwschema definition in LocalSettings.php.

What to do in case of "unexpected T_STRING" error
Individuals running update.php from the command line may encounter the following error:

 syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' \ in ~/maintenance/commandLine.inc on line 13

This error occurs when update.php is run from php4.

Individuals who have their site hosted by providers who provide both php4 and php5 should take the following steps:


 * 1) from the command line, enter the command 'whereis php5'
 * 1) once you have discerned the location of the php5 path, list the contents of php5/bin directory
 * 1) once you've determined the name of the PHP executable (either PHP or php5), type in the entire path to execute update.php

Below is an example:

<pre style="overflow:auto;"> $ command -v php5 $ ls -la /usr/local/php5/bin $ /usr/local/php5/bin/php update.php

What to do in case of 'register_argc_argv is set to false' error
You may encounter the error: <pre style="overflow:auto;"> Cannot get command line arguments, register_argc_argv is set to false


 * 1) Go to ~/maintenance. Either edit an existing 'php.ini' file, or create one.
 * 1) Add a line as follows:

<pre style="overflow:auto;"> register_argc_argv=true


 * 1) Re-run

<span id="Web_browser">

Πρόγραμμα περιήγησης Ιστού

 * See also 

If your database is already big and in high production usage, then you should not be using the Web updater, e.g. because the update process will time out when the maximum_execution_time is reached. In that case you should use update.php from the command-line interface (not from the web). What exactly is "too big" depends on your server (e.g. on its performance, the load and on how long the maximum execution time of PHP allows the script to run). If your wiki is too big for the web updater and your hosting provider does not allow command-line access, then you need to migrate your wiki to another hosting account, preferably to one that does have shell access.

For example, if your wiki is at, then navigate to.
 * 1) Always back up before performing database maintenance.
 * 1) Navigate your web browser to.
 * 1) Select your language and click continue.
 * 1) The existing installation should be detected. Follow the instructions on the screen to upgrade it. If asked for the "upgrade key", open your  file and look for the key assigned to.

It might happen that the web-updater does not seem to work: Instead of seeing the initial language selection screen, you might see an empty wiki page, possibly with some error message. In this case it is most likely that your web server uses Rewrite Rules (most likely for short URLs), which do not show you the updater at mw-config/, but a wiki page at Mw-config/, with capital "M". In this case, rename the .htaccess file for the time of the update. Then you should be able to access the web-updater.

<span id="Test_the_update">

Δοκιμάστε την ενημερωμένη έκδοση
Once the upgrade has been completed, browse to the wiki and check that the following operations work as expected:


 * Viewing pages
 * Editing pages
 * Uploading a file
 * Visit Special:Version and check that the version shown is correct and that the extensions are present.

<span id="Remove_leftovers_from_old_installations">

Αφαιρέστε υπολείμματα από παλιές εγκαταστάσεις
If you have copied your previous installation to another folder on the server, be sure to remove it or make it completely inaccessible from the web. It is very important to not leave old installations accessible from the web, since it completely defeats the purpose of upgrading, and leaves your server open to attacks.

<span id="Frequently_asked_questions">

Συχνές ερωτήσεις
<section begin=FAQ /> <span id="How_hard_is_it_to_upgrade?">

Πόσο δύσκολη είναι η αναβάθμιση;
If the only file you have modified is, and you are upgrading from 1.5 or later, the process is very simple. The amount of human work involved is only a few minutes. The database schema changes will take an amount of time proportional to the size of your database — potentially hours for wikis with millions of pages, but for a more typical size of a few thousand pages, it is usually done in seconds.

Minor upgrades, within the same major version, say from .0 to, do not require any schema changes at all. You can just update the files. The database needs no update, hence it is not necessary to run the updater script.

Upgrading from 1.4 or earlier is potentially complicated because support for character sets other than UTF-8 was dropped, and the schema for storing bulk text changed. Please read the relevant section in the  file.

Upgrading becomes difficult if you have modified our source code, and you don't want your changes to be overwritten. Tools such as diff, patch, Meld or WinMerge may be useful. There is also potential for trouble if you are using unmaintained extensions. Upgrade your extensions at the same time as you upgrade MediaWiki.

If you have modified the skin or use a custom skin, you very likely will have to adjust it to work again with the new version of MediaWiki.

<span id="How_do_I_upgrade_from_a_really_old_version?_In_one_step,_or_in_several_steps?">

Πώς αναβαθμίζω από μια πολύ παλιά έκδοση; Σε ένα βήμα, ή σε πολλαπλά βήματα;
It depends: If you are upgrading from MediaWiki 1.4 or older, you should upgrade to MediaWiki 1.5 first. If you are upgrading from a Latin-1 wiki, use upgrade1_5.php (found in MediaWiki 1.5) to convert the relevant parts of the database to UTF-8 ( needs to be set to true in your for this to work). Next, run update.php, and then set the option in LocalSettings.php to the encoding previously used by the wiki (e.g. windows-1252). This is basically how Wikipedia and other Wikimedia Foundation sites were upgraded from MediaWiki 1.4 to 1.5 – see some related notes at Wikitech. You may need to upgrade to MediaWiki 1.4 before running the upgrade1.5 script. If you want to make a database dump (e.g. MySQL) of your Latin-1 wiki, make sure the type of the  field in the  table is , not  , to avoid character encoding issues.

If you are upgrading from MediaWiki 1.5 or newer to 1.35, you can upgrade in one step, from your old version to the latest stable version. The vast majority of reports, as well as automated testing, indicate that doing it in one step works just fine. If you have trouble believing this, read this mailing list post. However, please note that when you update from old versions, chances that you will encounter PHP errors are bigger than when you upgrade from the version directly previous to the new version. You would have received these errors anyway, had you not skipped versions, but the errors would have been associated with each individual update. Instead, if you update several versions at once, you'll get the same set of errors all at the same time. This will make the upgrade more difficult, but do not forget that you did not have the trouble of updating to the intermediate versions, which you skipped!

If you are upgrading to MediaWiki 1.36 or later, only upgrades from the last two LTS releases will be supported (T259771). This will mean that for very old versions, that you first upgrade to MediaWiki 1.35 and then upgrade to 1.36.

<span id="Should_I_back_up_first?">

Πρέπει να πάρω αντίγραφα ασφαλείας πρώτα;
Short answer: Yes.

Long answer: It depends on a) how much you value your data, b) how hard it is to create a backup and c) how confident you are with MySQL maintenance and administration.

An upgrade failure may leave your database in an inconsistent state, in between two versions. A PHP or MySQL error might happen during upgrade leaving your database partly upgraded. In such situations it may be possible to somehow fix this problem with much manual work. However, it will be way easier to just put a database backup from before running update.php in place and to continue with that. Otherwise you might have hours of - needless - work.

Recovery is often complex. Volunteers on the support forums are unlikely to be impressed if you neglect to make a backup and then need help to recover from upgrade-related corruption. A better outcome is if you can revert to your backup, and then report the bug against the corresponding MediaWiki project in the upgrade process which caused the corruption.

<span id="Can_I_keep_my_LocalSettings.php?">

Μπορώ να κρατήσω το LocalSettings.php μου;
Yes, but you may have to make some minor changes. The format of is largely backward compatible. Changes which break LocalSettings.php compatibility will be documented in the "configuration changes" section of the release notes.

<span id="Can_my_wiki_stay_online_while_it_is_upgrading?">

Μπορεί το wiki μου να παραμένει σε σύνδεση ενώ αναβαθμίζεται;
Σε γενικές γραμμές ναι, ωστόσο το Git μπορεί να το διακόψει προσωρινά (για μερικά δευτερόλεπτα).

If you are upgrading between minor releases of MediaWiki, all you need to do is update the source files.

Note: the following assumes you have command line access. If you are upgrading between major releases of MediaWiki, the preferred procedure is as follows:

$adminTask = ( ===  ||  ); = $adminTask ? : ;  (This will make the database writable again, because  was only set in the old directory's LocalSettings.php.)
 * 1) Unpack the new version of MediaWiki into a new directory
 * 1) Prepare that new directory: copy your current LocalSettings.php from the old directory, copy any installed extensions and custom skins (if any). Check  and  settings in LocalSettings.php and if necessary copy logo file from the old directory to the new directory.
 * 1) In the release notes for the new version, see if any changes need to be made to LocalSettings.php.
 * 1) In the old directory, edit LocalSettings.php and insert the following code. This will place the database in read-only mode for regular wiki activity, without restricting your own update actions. Users will see the message provided if they attempt an edit during the upgrade process:
 * 1) Run the update script or the web updater in the new directory.
 * 1) Copy the images from the images sub-directory from the old directory to the new directory.
 * 1) Swap the old directory and the new directory.

<span id="Why_upgrade?">

Γιατί να αναβαθμίσω;

 *  Subscribe to mediawiki-announce to be notified of new releases. 

Recent releases receive security fixes to keep your wiki and your host safe from vandals, while old releases don't (see ).

New major releases come with new features, which you might want to use: see the release notes for details. <section end=FAQ />

<span id="See_also">

Δείτε επίσης

 * Greg Sabino Mullane's Blog post provides some more detail about point release upgrades.
 * Help and Support if you need help or something went wrong
 * - 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
 * - if you don't have a successful backup