MySQL

MySQL

Veeam supports backup and restore of MySQL databases.

Backup Options:

The following options are supported to backup MySQL databases:

  • HotBackup Database Online Dump.

    o Online Dump to the same server.
o Online Dump to Staging server

  • HotBackup Database Freeze.

  • ColdBackup Database Shutdown.

HotBackup Database Online Dump:

There are multiple options available regarding Database Online Dump, one of the option is to use Veeam Pre & Post Thaw Scripts to dump the database during the backup operations and other option to dump the database to another staging server and protect the staging server from Veeam.

Let’s go through each option one by one in the details:

Database Online Dump During Backup Operations:

In this option the pre-freeze script will dump all databases hosted on the guest to a single file under the /tmp directory. Before the VM snapshot creation, the mysql dump native command will dump a copy of the database while service will remain available.

The dump will be deleted by post-thaw script after the guest snapshot has been successful. Pre Freeze Sciprt:

  1. Use Editor

  2. Copy the content in the editor.

    !/bin/bash
# config:
# when running on debian we can use existing debian-sys-maint account using defaults file
# otherwise, specify username and password below using use_credentials
#use_credentials="-uroot -p"
defaults_file="/etc/my.cnf"
dump_file="/tmp/mysql_dump.sql"
database="--all-databases"
if [ -f $defaults_file ]
then
opts="--defaults-file=$defaults_file"
elif [ -n $use_credentials ]
then
opts="$opts $use_credentials"
else
echo "$0 : error, no mysql authentication method set" | logger
exit 1
fi
opts="$opts $database"
echo "$0 executing mysqldump" | logger
mysqldump $opts >$dump_file 2>/dev/null
if [ $? -ne 0 ]
then
echo "$0 : mysqldump failed" | logger
exit 2
else
echo "$0 : mysqldump suceeded" | logger
sync;sync
fi

  3. Save script as PreFreeze.sh

  4. Use script as pre-freeze script in a backup job.

Post-Thaw Scripts 1. Use Editor 2. Copy the below in the editor:

#!/bin/bash
dump_file="/tmp/mysql_dump.sql"
if [ -f $dump_file ]
then
echo "$0 deleting mysql dump file $dump_file" | logger
rm -f $dump_file > /dev/null 2>&1
exit 0
else
echo "$0 could not locate mysql dump file $dump

  1. Save file as PostThaw.sh.

  2. Use script as Post-Thaw script in the backupjob

**Online Dump to Staging server

Another option is to dump the MySQL database to staging server and protect staging server from backup job.

  1. Create new server or use any existing server as NFS Share.

  2. Create Script to dump the MySQL database to Staging server

  3. Use Editor

  4. Copy below sample code in the editor:

    ```

    !/bin/bash

    Shell script to backup MySQL database

Set these variables

MyUSER="" # DB_USERNAME MyPASS="" # DB_PASSWORD MyHOST="" # DB_HOSTNAME

Backup Dest directory

DEST="" # /home/username/backups/DB

Email for notifications

EMAIL=""

How many days old files must be to be removed

DAYS=3

Linux bin paths

MYSQL="$(which mysql)" MYSQLDUMP="$(which mysqldump)" GZIP="$(which gzip)"

Get date in dd-mm-yyyy format

NOW="$(date +"%d-%m-%Y_%s")"

Create Backup sub-directories

MBD="$DEST/$NOW/mysql" install -d $MBD

DB skip list

SKIP="information_schema another_one_db"

Get all databases

DBS="$($MYSQL -h $MyHOST -u $MyUSER -p$MyPASS -Bse 'show databases')"

Archive database dumps

for db in $DBS do skipdb=-1 if [ "$SKIP" != "" ]; then for i in $SKIP do [ "$db" == "$i" ] && skipdb=1 || : done fi

if [ "$skipdb" == "-1" ] ; then
    FILE="$MBD/$db.sql"
$MYSQLDUMP -h $MyHOST -u $MyUSER -p$MyPASS $db > $FILE
fi

done

Archive the directory, send mail and cleanup

cd $DEST tar -cf $NOW.tar $NOW $GZIP -9 $NOW.tar

echo "MySQL backup is completed! Backup name is $NOW.tar.gz" | mail -s "MySQL backup" $EMAIL rm -rf $NOW

Remove old files

find $DEST -mtime +$DAYS -exec rm -f {} \;

5.    Save file as DB_Backup.sh.
6.    Use Linux Scheduler to run the script on desired time for the backup.
7.    Configure the backup of staging VM.

***HotBackup Database Freeze.

In this option, Veeam will freeze the database during pre-freeze script and release the database in post-thaw, MySQL table will be flashed to disk into read-only state and writable once the VM snapshot has
been created.

1.    Use editor 
2.    Copy the sample code

!/bin/bash

config:

when running on debian we can use existing debian-sys-maint account using defaults file

otherwise, specify username and password below using use_credentials

use_credentials="-uroot -p"

defaults_file="/etc/my.cnf" timeout=300 lock_file=/tmp/mysql_tables_read_lock

if [ -f $defaults_file ]; then opts="--defaults-file=$defaults_file" fi if [ -n $use_credentials ]; then opts="$opts $use_credentials" fi sleep_time=$((timeout+10)) rm -f $lock_file echo "$0 executing FLUSH TABLES WITH READ LOCK" | logger mysql $opts -e "FLUSH TABLES WITH READ LOCK; system touch $lock_file; system nohup sleep $sleep_time; system echo lock released|logger; " > /dev/null & mysql_pid=$! echo "$0 child pid $mysql_pid" | logger c=0 while [ ! -f $lock_file ] do

check if mysql is running

if ! ps -p $mysql_pid 1>/dev/null ; then echo "$0 mysql command has failed (bad credentials?)" | logger exit 1 fi sleep 1 c=$((c+1)) if [ $c -gt $timeout ]; then echo "$0 timed out waiting for lock" | logger touch $lock_file kill $mysql_pid fi done echo $mysql_pid > $lock_file exit 0

3.    Save as PreFreeze.sh.
4.    Configure the script as prefreeze script in the backup job.

Post-Thaw Script:
1.    Use Editor
2.    Copy the sample code

!/bin/bash

lock_file=/tmp/mysql_tables_read_lock

mysql_pid=$(cat $lock_file) echo "$0 sending sigterm to $mysql_pid" | logger pkill -9 -P $mysql_pid rm -f $lock_file exit 0

3.    Save code as Post-Thaw.sh 
4.    Configure post-thaw script in the backup job.

*Tip* 
> Adjust the timeout according to database size, in the sample script we have set 300 seconds for timeout

## Cold Backup Database Shutdown:

In this option, Veeam will use pre and post-thaw script to stop and start the MySQL service using init.d or systemctl commands, depending on the database packages during the snapshot operations.

#### Pre-Freeze Script

1.    Use Editor
2.    Copy the sample code below

!/bin/bash

timeout=300 if [ -f /var/run/mysqld/mysqld.pid ] then mysql_pid=$(cat /var/run/mysqld/mysqld.pid) >/dev/null 2>&1 else echo "$0 : Mysql not started or bad mysql pid file location" | logger exit 1 fi echo "$0 : Processing pre-freeze backup script" | logger /etc/init.d/mysqld stop mysql & > /dev/null 2>&1 c=0 while [ true ] do if [ $c -gt $timeout ] then echo "$0 : timed out, mysql shutdown failed" | logger exit 2 fi

check if mysql is running

if [ -f /var/run/mysqld/mysqld.pid ] then echo "$0 : Waiting 5 more seconds for mysql shutdown" | logger sleep 5 c=$((c+5)) else echo "$0 : Mysql stopped" | logger sync;sync break

fi done

3.    Save code as Pre-Freeze.sh
4.    Configure the script to run with backup job as pre-freeze script.

#### Post-Thaw Script:

1.    Use Editor
2.    Copy the sample code below

!/bin/bash

timeout=300 echo "$0 : processing post-thaw backup script" | logger if [ -f /var/run/mysqld/mysqld.pid ] then mysql_pid=$(cat /var/run/mysqld/mysqld.pid) >/dev/null 2>&1 echo "$0 : Mysql already started with PID $mysql_pid" | logger exit 1 fi /etc/init.d/mysqld start mysql & > /dev/null 2>&1 c=0 while [ true ] do if [ $c -gt $timeout ] then echo "$0 : timed out, mysql startup failed" | logger exit 2 fi

check if mysql is running

if [ -f /var/run/mysqld/mysqld.pid ] then mysql_pid=$(cat /var/run/mysqld/mysqld.pid) >/dev/null 2>&1 echo "$0 : MySQL started with pid $mysql_pid" | logger break else echo "$0 : Waiting 5 more seconds for mysql startup" sleep 5 c=$((c+5)) fi done

``` 3. Save code as Postthaw.sh 4. Configure the backup job to run the script as Post Thaw Script.

Restore:

The restore is the integrated part of MySQL protection strategy. Veeam provides multiple option of MySQL restores depends on the backup method. Let’s go through the option for each backup method.

Database Online Dump During Backup Operations:

For this backup option, Veeam provides following restore options depends on the failure:

Failure

Restore Option

Server Failed

Instant Server Restore

Database or Application Level Failure

Guest File Level Restore

Database Item Level Restore

Veeam Universal Application Item Restore

Online Dump to Staging server

In this backup job, Veeam provides following restore options

Failure

Restore Option

Database Restore

Instant File Level Restore

Tip

In addition to online dump to staging server, take crash-consistency backup of mysql server and in case of server failure restore the mysql server from crach-consistency backup and use database dump from staging server to restore the database.

HotBackup Database Freeze.

For this backup option, Veeam provides following restore options depends on the failure:

Failure

Restore Option

Server Failed

Instant Server Restore

Database or Application Level Failure

Guest File Level Restore

Database Item Level Restore

Veeam Universal Application Item Restore

ColdBackup Database Shutdown.

For this backup option, Veeam provides following restore options depends on the failure:

Failure

Restore Option

Server Failed

Instant Server Restore

Database or Application Level Failure

Guest File Level Restore

Database Item Level Restore

Veeam Universal Application Item Restore

For more details about protection and restore use MySQL Protection Whitepaper

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