So recently we needed rapid backups of one of our MySQL servers. As everyone know server admin tasks are not my favorite thing to do, but it is obviously a need in our development environment so I got to thinking what was a quick reliable way to accomplish this task. The backup is easy:
Write a small script to dump the db:
#!/bin/sh timestamp=$(date '+%d-%m-%Y@%H:%M') mysqldump -u dbuser -pPassword --all-databases | gzip > /tmp/path/for/backup/database_$timestamp.sql.gz
This is a bash script that stores the current timestamp to a variable then goes about dumping the databases to text and piping that to gzip which outputs a gzipped version of the DB. Compression is good since we’re going to email it to a Gmail account for storage and we wanna maximize our 7 GB of backup space.
$timestamp in our filepath is replaced by the timestamp we generate above.
Next we actually need to mail this file to our backups account, after a short research session i came across mutt. Which seems to fufill the requirement of sending a email with an attached file easily from the command line:
mutt -s "Hourly backup from c4.kohsrv.net | $timestamp" -a /tmp/path/for/backup/database_$timestamp.sql.gz firstname.lastname@example.org < /path/to/msg/body.txt
An odd convetion of mutt that i didnt take alot of time to explore was u have to read in a text file for the msg body. this can probably be done without a file but for simplicity i just created a small text file with something like Backup from devserver. and moved on with my life.
Finally u can delete the temp file or leave it for redundency just beaware it will take up space over time.
So our completed bash script should look like
#!/bin/sh timestamp=$(date '+%d-%m-%Y@%H:%M') mysqldump -u dbuser -pPassword --all-databases | gzip > /tmp/path/for/backup/database_$timestamp.sql.gz mutt -s "Hourly backup from c4.kohsrv.net | $timestamp" -a /tmp/path/for/backup/database_$timestamp.sql.gz email@example.com < /path/to/msg/body.txt rm /tmp/path/for/backup/database_$timestamp.sql.gz
Now we have to do a couple things to make this actually work first u need to:
Save it to a file in a folder, in our case since CentOS (our server) has cron folders already setup we save it in /etc/cron.hourly which is preconfigured to run every script in that folder every hour.
If your os does not have preconfigured cron folders u need to add ur script to your cron this article will not go into it, but the cron is a task scheduler so when configured properly u could run a task at a given intreval on your server auto-magically. Theres a good article on configuring the cron here: http://unixgeeks.org/security/newbie/unix/cron-1.html but thats all ill say about that.
Make sure your file is marked executable or it wont run most likely returning Permission Denied, to do this run:
chmod +x filename.sh
So thats about it. Now your server should send your backup account an email every hour or however long you made your interval and email with a database backup.