Even I set max_connection in /etc/my.cnf on CentOS 7, it not work

[root@localhost ~]# uname -a

Linux localhost.localdomain 3.10.0-327.el7.x86_64 #1 SMP Thu Nov 19 22:10:57 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

[root@localhost ~]# lsb_release -a

LSB Version:    :core-4.1-amd64:core-4.1-noarch

Distributor ID: CentOS

Description:    CentOS Linux release 7.2.1511 (Core)

Release:        7.2.1511

Codename:       Core

Mariadb version is 10.1.12

[root@localhost ~]# rpm -qa | grep mariadb

mariadb-10.1.12-4.el7.x86_64

mariadb-server-10.1.12-4.el7.x86_64

mariadb-errmsg-10.1.12-4.el7.x86_64

mariadb-config-10.1.12-4.el7.x86_64

mariadb-common-10.1.12-4.el7.x86_64

mariadb-libs-10.1.12-4.el7.x86_64

[root@localhost ~]# cat /etc/my.cnf

[mysqld]

datadir=/var/lib/mysql

socket=/var/lib/mysql/mysql.sock

# Disabling symbolic-links is recommended to prevent assorted security risks

symbolic-links=0

# Settings user and group are ignored when systemd is used.

# If you need to run mysqld under a different user or group,

# customize your systemd unit file for mariadb according to the

# instructions in http://fedoraproject.org/wiki/Systemd

# Added for Openstack

bind-address = 172.16.7.195

default-storage-engine = innodb

innodb_file_per_table

collation-server = utf8_general_ci

character-set-server = utf8

max_connections = 500

[mysqld_safe]

log-error=/var/log/mariadb/mariadb.log

pid-file=/var/run/mariadb/mariadb.pid

#

# include all files from the config directory

#

!includedir /etc/my.cnf.d

MariaDB [(none)]> show variables like 'max_connections';

+-----------------+-------+

| Variable_name   | Value |

+-----------------+-------+

| max_connections | 214   |

+-----------------+-------+

1 row in set (0.00 sec)