mysql install init failure on centos7 - mysql

Question

I am trying to install Mysql Community Server version5.6.40 on my Centos7 VM.
During the installation i have met below problems:
1)
[root#Mysql_Server scripts]# ./mysql_install_db.sh --user=mysql --basedir=/application/mysql --datadir=/application/mysql/data
-bash: ./mysql_install_db.sh: Permission denied
[root#Mysql_Server support-files]# /etc/init.d/mysqld start
-bash: /etc/init.d/mysqld: Permission denied
i have use chmod a+x filename to assign the execute rights but i just want to know why those files lacks of execution rights. //i download the mysql installation tar file and extract with root privilege
2)while i was running the mysql_install_db.sh
[root#Mysql_Server scripts]# ./mysql_install_db.sh --user=mysql --basedir=/application/mysql --datadir=/application/mysql/data
FATAL ERROR: Could not find my_print_defaults
The following directories were searched:
/application/mysql/bin
/application/mysql/extra
If you compiled from source, you need to run 'make install' to
copy the software into the correct location ready for operation.
If you are using a binary release, you must either be at the top
level of the extracted archive, or pass the --basedir option
pointing to that location.
i tried follow steps to find out what the possible reason for causing this issue:
find / my_print_defaults
find: ‘my_print_defaults’: No such file or directory
and
ls /application/mysql/
[root#Mysql_Server scripts]# ls /application/mysql/
BUILD dbug libmysqld README support-files
client Docs libservices regex tests
cmake Doxyfile-perfschema man scripts unittest
CMakeLists.txt extra mysql-test sql VERSION
cmd-line-utils include mysys sql-bench vio
config.h.cmake INSTALL mysys_ssl sql-common win
configure.cmake libevent packaging storage zlib
COPYING libmysql plugin strings
no bin and extra directory were created.
so i was wondering if it was caused by lacking of gcc gcc-c++ because my centos7 installation chose minimal install.
or maybe it was caused by lacking of execution rights result the shell files did run correctly.
attached:below whole operations for better trouble shooting
[root#Mysql_Server ~]# yum install wget -y
[root#Mysql_Server ~]# wget https://cdn.mysql.com/archives/mysql-5.6/mysql-5.6.40.tar.gz
[root#Mysql_Server ~]# tar -xf mysql-5.6.40.tar.gz
[root#Mysql_Server ~]# mkdir /application
[root#Mysql_Server ~]# mv mysql-5.6.40 /application/
[root#Mysql_Server ~]# ln -s /application/mysql-5.6.40/ /application/mysql
[root#Mysql_Server ~]# cd /application/mysql/support-files/
[root#Mysql_Server support-files]# cp my-default.cnf.sh /etc/my.cnf
[root#Mysql_Server support-files]# cp mysql.server.sh /etc/init.d/mysqld
[root#Mysql_Server support-files]# cd /application/mysql/scripts/
[root#Mysql_Server scripts]# useradd mysql -s /sbin/nologin -M
[root#Mysql_Server scripts]# chmod a+x mysql_install_db.sh
[root#Mysql_Server scripts]# ./mysql_install_db.sh --user=mysql --basedir=/application/mysql --datadir=/application/mysql/data

Answer 1

It is a fatal mistake by misunderstanding between the source code and binary package.
Since i downloaded the source code which can not be run directly without encoding and packaging.
Thanks again for #danblack's reminds!
I've successfully run mysql_community_server on centos7 now.(using the binary package installed).
now i am going to install mysql by using the source code.