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Merge pull request #9602 from AndyHee/patch-20201125
Documentation for Migrating to new server
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Hypolite Petovan
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@ -35,6 +35,7 @@ Friendica Documentation and Resources
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* [Using SSL with Friendica](help/SSL)
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* [Config values that can only be set in config/local.config.php](help/Config)
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* [Improve Performance](help/Improve-Performance)
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* [Migrate](help/Migrate)
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* [Administration Tools](help/tools)
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**Developer Manual**
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92
doc/Migrate.md
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92
doc/Migrate.md
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@ -0,0 +1,92 @@
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Migrating to a new server installation
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===============
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* [Home](help)
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## Preparation
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### New server
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Set up your new server as described [here](Install); follow the installation procedure until you have created a database.
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### Heads up to users
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Inform your users of an upcoming interruption to your service.
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To ensure data consistency, your server needs to be offline during some steps of the migration processes.
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You may also find these addons useful for communicating with your users prior to the migration process:
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* blackout
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* notifyall
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### Storage
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Check your storage backend with ``bin/console storage list`` in the root folder.
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The output should look like this:
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````
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Sel | Name
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-----------------------
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| Filesystem
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* | Database
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````
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If you are *not* using ``Database`` run the following commands:
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1. ``bin/console storage set Database`` to activate the database backend.
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2. ``bin/console storage move`` to initiate moving the stored image files.
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This process may take a long time depending on the size of your storage and your server's capacity.
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Prior to initiating this process, you may want to check the number of files in the storage with the following command: ``tree -if -I index.html /path/to/storage/``.
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### Cleaning up
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Before transferring your database, you may want to clean it up; ensure the expiration of database items is set to a reasonable value and activated via the administrator panel.
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*Admin* > *Site* > *Performance* > Enable "Clean up database"
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After adjusting these settings, the database cleaning up processes will be initiated according to your configured daily cron job.
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To review the size of your database, log into MySQL with ``mysql -p`` run the following query:
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````
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SELECT table_schema AS "Database", SUM(data_length + index_length) / 1024 / 1024 / 1024 AS "Size (GB)" FROM information_schema.TABLES GROUP BY table_schema;
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````
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You should see an output like this:
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````
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+--------------------+----------------+
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| Database | Size (GB) |
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+--------------------+----------------+
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| friendica_db | 8.054092407227 |
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| [..........] | [...........] |
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+--------------------+----------------+
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````
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Finally, you may also want to optimise your database with the following command: ``mysqloptimize -p friendica-db``
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### Going offline
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Stop background tasks and put your server in maintenance mode.
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1. If you had set up a worker cron job like this ``*/10 * * * * cd /var/www/friendica; /usr/bin/php bin/worker.php`` run ``crontab -e`` and comment out this line. Alternatively if you deploy a worker daemon, disable this instead.
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2. Put your server into maintenance mode: ``bin/console maintenance 1 "We are currently upgrading our system and will be back soon."``
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## Dumping DB
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Export your database: ``mysqldump -p friendica_db > friendica_db-$(date +%Y%m%d).sql`` and possibly compress it.
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## Transferring to new server
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Transfer your database and a copy of your configuration file ``config/local.config.php.copy`` to your new server installation.
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## Restoring your DB
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Import your database on your new server: ``mysql -p friendica_db < your-friendica_db-file.sql``
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## Completing migration
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### Configuration file
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Copy your old server's configuration file to ``config/local.config.php``.
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Ensure the newly created database credentials are identical to the setting in the configuration file; otherwise update them accordingly.
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### Cron job for worker
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Set up the required daily cron job.
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Run ``crontab -e`` and add the following line according to your system specification
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``*/10 * * * * cd /var/www/friendica; /usr/bin/php bin/worker.php``
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### DNS settings
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Adjust your DNS records by pointing them to your new server.
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## Troubleshooting
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If you are unable to login to your newly migrated Friendica installation, check your web server's error and access logs and mysql logs for obvious issues.
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If still unable to resolve the problem, it's likely an issue with your [installation](Install).
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In this case, you may try to an entirely new Friendica installation on your new server, but use a different FQDN and DNS name.
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Once you have this up and running, take it offline and purge the database and configuration file and try migrating to this installation.
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