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CentOS7安装MariaDB服务无法启动的问题 - CSDN博客 http://blog.csdn.net/u013412790/article/details/51713149
mysql之mysql安装、初始化，以及mysql相关命令的使用 - 小私的blog - 51CTO技术博客 http://ggvylf.blog.51cto.com/784661/1680973

yum -y install mariadb-server

Installed:
  mariadb-server.x86_64 1:5.5.56-2.el7                                                                      

Dependency Installed:
  libaio.x86_64 0:0.3.109-13.el7                        mariadb.x86_64 1:5.5.56-2.el7                       
  perl-Compress-Raw-Bzip2.x86_64 0:2.061-3.el7          perl-Compress-Raw-Zlib.x86_64 1:2.061-4.el7         
  perl-DBD-MySQL.x86_64 0:4.023-5.el7                   perl-DBI.x86_64 0:1.627-4.el7                       
  perl-Data-Dumper.x86_64 0:2.145-3.el7                 perl-IO-Compress.noarch 0:2.061-2.el7               
  perl-Net-Daemon.noarch 0:0.48-5.el7                   perl-PlRPC.noarch 0:0.2020-14.el7                   

Dependency Updated:
  mariadb-libs.x86_64 1:5.5.56-2.el7                                                                        

Complete!

mysql                       mysqld_safe_helper          mysql_secure_installation
mysqlaccess                 mysqldump                   mysql_setpermission
mysqladmin                  mysqldumpslow               mysqlshow
mysqlbinlog                 mysql_find_rows             mysqlslap
mysqlbug                    mysql_fix_extensions        mysqltest
mysqlcheck                  mysqlhotcopy                mysql_tzinfo_to_sql
mysql_convert_table_format  mysqlimport                 mysql_upgrade
mysqld_multi                mysql_install_db            mysql_waitpid
mysqld_safe                 mysql_plugin                mysql_zap

[root@aftree /usr/java/jdk1.8.0_152]# mysql_install_db 
Installing MariaDB/MySQL system tables in '/var/lib/mysql' ...
171023 12:20:56 [Note] /usr/libexec/mysqld (mysqld 5.5.56-MariaDB) starting as process 22452 ...
OK
Filling help tables...
171023 12:20:57 [Note] /usr/libexec/mysqld (mysqld 5.5.56-MariaDB) starting as process 22461 ...
OK

To start mysqld at boot time you have to copy
support-files/mysql.server to the right place for your system

PLEASE REMEMBER TO SET A PASSWORD FOR THE MariaDB root USER !
To do so, start the server, then issue the following commands:

'/usr/bin/mysqladmin' -u root password 'new-password'
'/usr/bin/mysqladmin' -u root -h aftree.6oo0.com password 'new-password'

Alternatively you can run:
'/usr/bin/mysql_secure_installation'

which will also give you the option of removing the test
databases and anonymous user created by default.  This is
strongly recommended for production servers.

See the MariaDB Knowledgebase at http://mariadb.com/kb or the
MySQL manual for more instructions.

You can start the MariaDB daemon with:
cd '/usr' ; /usr/bin/mysqld_safe --datadir='/var/lib/mysql'

You can test the MariaDB daemon with mysql-test-run.pl
cd '/usr/mysql-test' ; perl mysql-test-run.pl

Please report any problems at http://mariadb.org/jira

The latest information about MariaDB is available at http://mariadb.org/.
You can find additional information about the MySQL part at:
http://dev.mysql.com
Consider joining MariaDB's strong and vibrant community:
https://mariadb.org/get-involved/