torsdag 12 februari 2015

Creating a minimal MySQL installation for embedded system!

Over the last few MySQL releases the size of the MySQL package have increased in size and it looks like the trend is continuing.
  • 687M MySQL 5.5.42
  • 1,1G  MySQL 5.6.21
  • 1,3G  MySQL 5.7.4
  • 1,5G         MySQL 5.7.5
This guide is for a Linux installation. I have tested the instructions below to create a minimal installation on my Ubuntu 14.04 laptop. I know you can make it a bit smaller by running mysqld directly and only using one error message file but this would not affect total size much. I also added the mysql client to have some way of logging into MySQL.

MySQL configuration file used to start MySQL:
ledir = /home/ted/labb/mini-mysql/bin

port = 63301
socket = /tmp/mysql63301.sock
basedir = /home/ted/labb/mini-mysql
datadir = /home/ted/labb/mini-mysql/data
tmpdir = /tmp
pid-file = /tmp/

Create MySQL basedir where you want to store all binaries:
mkdir /home/ted/labb/mini-mysql

Go to basedir:
cd /home/ted/labb/mini-mysql

Create folders for binaries and database (normally your datadir would not be located in your basedir):
mkdir bin
mkdir data

Download MySQL "Linux - Generic (glibc 2.5) (x86, 64-bit), Compressed TAR Archive" from
Copy files needed to start MySQL daemon and client program:
cp ~5.6.22/bin/mysql bin/
cp ~5.6.22/bin/mysqld bin/
cp ~5.6.22/bin/mysqld_safe bin/
cp -fr ~5.6.22/share .

We need some binaries and files to create mysql internal database, these can be removed later on:
cp ~5.6.22/scripts/mysql_install_db bin/
cp ~5.6.22/bin/resolveip bin/
cp ~5.6.22/support-files/my-default.cnf .

Create MySQL internal database:
./bin/mysql_install_db --datadir=./data/

# Now we can remove tools for creating internal mysql schema:
rm bin/mysql_install_db
rm bin/resolveip
rm my-default.cnf
rm rm my-new.cnf

Start server:
./bin/mysqld_safe --defaults-file=./my.cnf &

Log into server:
./bin/mysql -uroot -P63301 -h127.0.0.1

Total size of installation:
mysql$ du -sh *
88M     bin
3,2M    share

This is good news, with some minimal work it's still possible to get the binary package down to below 100M.

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