Migrate all databases to remote server with mysqldump in one step – 1:1 migration

Here is quick one, last in this year :). So I had to move a lot of databases to another server, but problem was, that on source server there wasn’t enough disk available. Also it was migration from very old mysql version to mariadb so mysqldump is your friend. Mysqldump all databases was out of the question because of low disk space. Dumping each database on its own would take too long and too many effort. But you can create dump of database and import it on new server in the same step.

First, you’ll need list of all databases on your source server and create them on new server. If your mysqldump creates “create database”, then you don’t need to create them manually on new server. If you want, you can skip mysql and any other databases that you don’t wish to transfer with grep. Put list of databases in some file – databases.txt for example. But first, make shure that command bellow show all databases. It is also necessary that you can remote access to mysql from source server to new server.

Test list all databases (exclude unwanted ones):

[root@oldserver ~]# mysql -e 'show databases' | grep -v "|" | grep -v "Database\|information_schema\|mysql\|performance_schema"
database1
geekytuts
database2
database3
database4
database5

Then put list of databases in text file databasest.txt:

[root@oldserver ~]# mysql -e 'show databases' | grep -v "|" | grep -v "Database\|information_schema\|mysql\|performance_schema" > databases.txt

Then you can import database to remote server like this:

mysqldump -u root -ppassword --single-transaction --skip-lock-tables database1 | mysql -h 1.1.1.1 -u root -ppassword database1

If you want to import all/multi databases, then use database.txt that we created in first step with for loop:

for i in `cat databases.txt`; do mysqldump -u root -ppassword --single-transaction --skip-lock-tables $i | mysql -h 1.1.1.1 -u root -ppassword $i; done

Bonus: If you need to create all databases listed in databases.txt on new server manualy, then you can also create all of them in one step. Use databases.txt on new server. If your mysqldump creates “create database” also, then you can skip this step.

[root@newserver ~]# for i in `cat databases.txt`; do mysql -u root -ppassword -e create database $i; done

Hope this helps someone.

Happy new year!

FTP file transfer from command line with wget

Sometimes you have a lot of files to transfer and no rsync, only FTP. You don’t want to sit in front of the computer and waiting for files to transfer. If you have access to command line, there is a simple solution on how to transfer all your files through FTP with wget. Once transfer is started you don’t want to close terminal session as you would cancel transfer also. Luckily there is great piece of software named screen. So, you start a new screen session by typing command screen, and run command below. Then you can detach from that screen session with pressing CTRL + A + D. This way file transfer will continue to transfer in background. You can even shut down your computer. When you want to see if all is transfered, you can just attach screen session back with command screen -x.

So in screen, just run this:

wget -m ftp://username:password@ftp.hostname.com

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