Centos: config mysql server

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1. install mysql server on centos

a) wget http://repo.mysql.com/mysql-community-release-el7-5.noarch.rpm
b) rpm -ivh mysql-community-release-el7-5.noarch.rpm
c) yum install mysql-community-server
d) service mysqld restart

2. set password for 'root'

a) # mysql -u root
b) mysql> use mysql;
c) mysql> update user set password=PASSWORD(‘your_password’) where User='root';

3. add new user

a) create user 'username'@'xxx.xxx.xxx.xxx' identified by 'password'; ('%' match any ip address)
a) mysql> select host,user from user; (check the privileges)

4. grant privileges for the user

a) grant all privileges on stock to 'username'@'xxx.xxx.xxx.xxx'; (grant privileges of database stock to 'username'@'xxx.xxx.xxx.xxx. *.* match any database)
b) select host,user from user; (check the privileges) 

5. allow firewall accept port 3306

a) # firewall-cmd --add-service=mysql --permanent
    success
b) # firewall-cmd --reload
    success
c) iptables -L -n | grep 3306 (check whether port 3306 is accept)
    ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0            tcp dpt:3306 ctstate NEW
d) firewall-cmd --state (check the state of the firewall)
     running

6. try to access mysql from remote host

a) mysql -h "xxx.xxx.xxx.xxx" -u username -p

7. change the datadir if you want

a) stop mysql
   1) systemctl stop mysqld.service
b) create new mysql data directory
   1) mkdir /var/data/mysql
c) modify /etc/my.cnf and point to new data directory – add the client section to the top
   [client]
   port=3306
   socket=/var/data/mysql/mysql.sock
   [mysqld]
   datadir=/var/data/mysql
   socket=/var/data/mysql/mysql.sock
d) copy all files from /var/lib/mysql to the new directory /var/data/mysql
   1) cp -r /var/lib/mysql/* /var/data/mysql
e) permissions for the new directory
   1) chown -R mysql /var/data/mysql;
   2) chgrp -R mysql /var/data/mysql;
   3) chmod -R g+rw /var/data/mysql;
f) also modify SELINUX settings to allow mysql to use the different path
   # add context and make it permanent 
   1) semanage fcontext -a -s system_u -t mysqld_db_t "/var/data/mysql(/.*)?"
   2) restorecon -Rv /var/data/mysql
g) start mysql
   1) systemctl start mysqld.service