How to create a second socket for mysqld
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11-12-2019 - |
Question
I would like to create second mysqld instance.
How can I create a second socket file?
I tried copying /var/run/mysqld/mysqld.sock
and create an empty file mysqld2.sock
but no luck.
Solution
You will want to use mysqld_multi, which is part of a typical MySQL server install. On my Ubuntu server, it was located at /usr/bin/mysqld_multi.
MySQL's Documentation on mysqld_multi
Here is a how to, I used to set up mysqld_multi: MySQL Multi How to
Update, running a 2nd instance from the shell
Start another mysqld using a different, port, socket and data directory
# make a new data directory
mkdir /var/lib/mysql2
# give ownership to mysql user
chown mysql:mysql -R /var/lib/mysql2
# install mysql database
mysql_install_db --user=mysql --datadir=/var/lib/mysql2/
# run 2nd daemon
/usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql2
--user=mysql
--log-error=/var/log/mysqld2.log
--pid-file=/var/lib/mysql2/mysql2.pid
--bind-address=127.0.0.1 --port=3307
--socket=/var/lib/mysql2/mysql2.sock &
Then connect to the 2nd instance with mysql
mysql --port 3307 --socket=/var/lib/mysql2/mysql2.sock
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