This website is based on the upcoming changes of the elabs Rails engine. Everything's not fine, but you can see the changes coming in the next releases.

This post is mainly an aggregation of ressources found there and there on the web in order save a MySQL database on a regular time basis, making the dumps available in a network shared folder.

Setup :

This article was written for a RaspberryPI with a Raspbian and a MySQL server. The steps should be the same for other Linux distributions.

MySQL user

First, we will create a mysql user wich only privileges will be to read the db:

On the raspberry pi, type:

  • mysql -uroot -p to log in Mysql as root (password will be prompted).
  • On the MySQL prompt : GRANT LOCK TABLES, SELECT ON DATABASE.* TO 'BACKUPUSER'@'%' IDENTIFIED BY 'PASSWORD'; to create the user BACKUPUSER with password PASSWORD with privileges on all tables in DATABASE. You can replace DATABASE with * to grant privileges on all dbs.
  • Then flush the privileges with flush privileges;.
  • You can now log out with exit;

The Cron task (Source)

First, create the folder where the dumps will be saved:

  • sudo mkdir /var/db_dumps

The task will be created on the current Raspberry, so this will be a local task:

  • Edit /etc/crontab with your favorite editor and add the following: 0 * * * * USER /usr/bin/mysqldump DATABASE -uBACKUPUSER -pPASSWORD > /var/db_dumps/filename.sql. If you plan to backup all your databases, replace DATABASE by --all-databases. USER is the a system user
  • If you want to have the date in your file name, use something like filename_`date +\%Y\%m\%d_\%H\%M`.sql (Source]
  • To help you creating the cron job, you can use the Crontab-generator

Setting up Samba share

For the files to be available on the network, i'll use Samba.

  • Install Samba with sudo apt-get install samba
  • Edit file /etc/samba/smb.conf
  • Add the following at the end of the file (got help from this):
[DbDumps]
  comment=Dumps of the MySQL server
  path=/var/db_dumps/
  browseable=yes
  read only=yes
  guest ok=yes
  public=yes

That's it...

Following this, your database will be saved every hour on a publicly read-only folder on your network. To go further, you can disable other shares in /etc/samba/smb.conf if you don't need it

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