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MYSQL.md

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MySQL Installation

Instructions

MacOS

This setup uses Homebrew.

Mojave users, please follow these instructions and, afterwards, the appended commands under Mojave Users below.

Dependencies:

  • $ brew install cmake

  • $ brew install openssl

Installation:

#make sure you don't have any other versions of mysql installed
$ brew list

#if you do
$ brew uninstall <[email protected]>
$ brew unlink <[email protected]>

#install 5.7
$ brew install [email protected]

$ brew link [email protected] --force

Test Usage:

# install brew services 
$ brew tap homebrew/services

# cmd to run always - suggest aliasing this in your bash profile
$ brew services start [email protected]

#confirm its running
$ brew services list

# cmd to stop running
$ brew services stop [email protected]

Update Permissions:

# check for right permissions to the PIDs
$ ls -laF /usr/local/var/mysql/

# if the owner is root you should change it to mysql or username
$ sudo chown -R <username> /usr/local/var/mysql/

# confirm updated permissions
$ ls -laF /usr/local/var/mysql/

Account Setup:

# secure your account
$  mysql_secure_installation   

# set password
$ mysqladmin -u root password <newpassword>  
# login -- not root anymore
$ mysql -u <username> -p <password>

Permission issues above?

(Note: These commands also fix the error - Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2))

$ mysql.server stop

#unset the temporary directory
$ echo $TMPDIR
$ unset TMPDIR
$ echo $TMPDIR

$ whoami

$ mysqld -initialize --verbose --user=$(whoami) --basedir="$(brew --prefix mysql)" --datadir=/usr/local/var/mysql --tmpdir=/tmp

#restart mysql
$ mysql.server restart

$ mysql -u root

#You should now be in the mysql command line shell
mysql> SELECT User, Host, authentication_string FROM mysql.user;

mysql> rename user 'root'@'localhost' to '<yourUsername>'@'localhost';

#confirm
mysql> SELECT User, Host, authentication_string FROM mysql.user; 

mysql> flush privileges;

mysql> exit

Reconfirm Access

Whenever you want to access the mysql db locally, you need to run this login first. It might be useful to alias this in your bash profile.

$ mysql -u <username> -p

Mojave Users:

  • Mojave changed the location of header files necessary for compiling C extensions, as well as mySQL file locations. You'll want to run these commands to ensure that later installation runs smoothly:
$ bundle config --local build.mysql2 "--with-ldflags=-L/usr/local/opt/openssl/lib --with-cppflags=-I/usr/local/opt/openssl/include"

$ sudo installer -pkg /Library/Developer/CommandLineTools/Packages/macOS_SDK_headers_for_macOS_10.14.pkg -target /

Linux

Installation:

# If you do not have mysql-server installed run
$ sudo apt-get install mysql-server
# Enter a password you can rem when prompted during installation for root

Configure MapKnitter account:

$ mysql -u root -p
# Enter the password you input during installation
# Create a mapknitter user
$ CREATE USER 'mapknitter' IDENTIFIED BY 'password';
# Grant permissions to the new user
$ GRANT ALL ON *.* TO 'mapknitter' WITH GRANT OPTION;

If you get the error Access denied for user 'root'@'localhost'" error"

Meaning maybe you forgot your root password or was not prompted when installing. You might be having some dependencies of mysql in your machine. You need to remove all the dependencies and reinstall mysql a fresh. Use the following commands to remove mysql and all its dependencies

$ sudo -i
$ service mysql stop
$ killall -KILL mysql mysqld_safe mysqld
$ apt-get --yes purge mysql-server mysql-client
$ apt-get --yes autoremove --purge
$ apt-get autoclean
$ deluser --remove-home mysql
$ delgroup mysql
$ rm -rf /etc/apparmor.d/abstractions/mysql /etc/apparmor.d/cache/usr.sbin.mysqld /etc/mysql /var/lib/mysql /var/log/mysql* /var/log/upstart/mysql.log* /var/run/mysqld
$ updatedb
$ exit

After this repeat installation and configuration steps

Add the username and passsword on the config/database.yml development:

Note: You can use MariaDB in development as your database if you are more comfortable with it

Troubleshooting

MySQL build / setup

  1. Ensure you have the lateset version of xcode installed (MacOS only)

  2. Check your MySQL verion to make sure it matches the one specified in the instructions: $ mysql --version

  1. Reference section on this page "permission issues above?" for handling this error:

    Cannot connect to local MySQL server through socket '/tmp/mysql.sock' (2)

mysql2 gem

  1. Ensure you have a database.yml set up for adapter: mysql2

    • Copy the contents of database.yml.example, but add your personal username and password, which should have been set up during MySQL setup.

  2. If you ever see this error, do not update to this gem. Instead, try running the commands under Mojave Users if you are a Mojave user, or ask look online or ask PL for help!

    Please install the mysql2 adapter: gem install activerecord-mysql2-adapter (cannot load such file -- mysql2/mysql2) (LoadError)

  3. Bundler skipping over mysql2 gem?

    $ rm .bundle/config

$ bundle exec bundle install