How to use yum to configure lnmp environment in CentOS7.6 system

Server: MariaDB
 Server version: 5.5.60-MariaDB MariaDB Server
 [root@ln-125 ~]# cat /etc/redhat-release
 CentOS Linux release 7.6.1810 (Core)
 [root@ln-125 ~]# nginx -v
 nginx version: nginx/1.14.2
 [root@ln-125 ~]# php-fpm -v
 PHP 5.4.16 (fpm-fcgi) (built: Oct 30 2018 19:32:20)
 Copyright (c) 1997-2013 The PHP Group
 Zend Engine v2.4.0, Copyright (c) 1998-2013 Zend Technologies

[root@ln-125 ~]# cat >> /etc/yum.repos.d/nginx.repo <<EOF
[nginx]
name=nginx-repo
baseurl=http://nginx.org/packages/centos/$releasever/$basearch/   
#releasever is the version number of Linux CentOS 7
gpgcheck=0
enabled=1
EOF

yum clean all;
yum makecache ;
yum list nginx;
#You can now see the nginx installation package;
yum install nginx;
systemctl enable nginx ;
systemctl start nginx

[root@ln-125 ~]# nginx -V
nginx version: nginx/1.14.2
built by gcc 4.8.5 20150623 (Red Hat 4.8.5-28) (GCC) 
built with OpenSSL 1.0.2k-fips 26 Jan 2017
TLS SNI support enabled
configure arguments: --prefix=/etc/nginx --sbin-path=/usr/sbin/nginx --modules-path=/usr/lib64/nginx/modules --conf-path=/etc/nginx/nginx.conf --error-log-path=/var/log/nginx/error.log --http-log-path=/var/log/nginx/access.log --pid-path=/var/run/nginx.pid --lock-path=/var/run/nginx.lock --http-client-body-temp-path=/var/cache/nginx/client_temp --http-proxy-temp-path=/var/cache/nginx/proxy_temp --http-fastcgi-temp-path=/var/cache/nginx/fastcgi_temp --http-uwsgi-temp-path=/var/cache/nginx/uwsgi_temp --http-scgi-temp-path=/var/cache/nginx/scgi_temp --user=nginx --group=nginx --with-compat --with-file-aio --with-threads --with-http_addition_module --with-http_auth_request_module --with-http_dav_module --with-http_flv_module --with-http_gunzip_module --with-http_gzip_static_module --with-http_mp4_module --with-http_random_index_module --with-http_realip_module --with-http_secure_link_module --with-http_slice_module --with-http_ssl_module --with-http_stub_status_module --with-http_sub_module --with-http_v2_module --with-mail --with-mail_ssl_module --with-stream --with-stream_realip_module --with-stream_ssl_module --with-stream_ssl_preread_module --with-cc-opt='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic -fPIC' --with-ld-opt='-Wl,-z,relro -Wl,-z,now -pie'

yum install -y php php-fpm php-pear php-devel #httpd 

vim /etc/nginx/conf.d/default.conf 
...
  location / {
    root /usr/share/nginx/html; #Set the absolute path of the root directory index index.html index.htm index.php; #Match php files}
  location ~ \.php$ { #Originally commented out, need to be enabled or copied root /usr/share/nginx/html; #Set the absolute path fastcgi_pass 127.0.0.1:9000;
    fastcgi_index index.php;
    fastcgi_param SCRIPT_FILENAME /scripts$fastcgi_script_name;
    fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name; #Set the root directory to match include fastcgi_params;
  }
...

touch /dev/shm/php-fpm-default.sock
[root@ln-125 ~]# cat /etc/php-fpm.d/www.conf |grep -Ev '^;|^$'
[www]
listen = /dev/shm/php-fpm-default.sock
listen.backlog = -1
listen.allowed_clients = 127.0.0.1
listen.owner = nobody
listen.group = nobody
listen.mode = 0666
user = nginx
group = nginx
. . .
systemctl restart php-fpm.service
systemctl enable php-fpm

vim /etc/php.ini 
cgi.fix_pathinfo=1 #Remove the comments and enable PHP's pathinfo pseudo-static function.
max_execution_time = 0 #The maximum time the script runs, 30 seconds by default max_input_time = 300 #The time the script can consume, 60 seconds by default memory_limit = 256M #The maximum memory consumed by the script, change the value according to your needs, 128M by default
post_max_size = 100M #The maximum data for a single submission. This item does not limit the size of a single uploaded file, but limits the submission data of the entire form. The limit range includes all content submitted by the form. For example, when posting a post, the post title, content, attachments, etc. The default is 8M
upload_max_filesize = 10M#The maximum permitted size of uploaded files, the default is 2M

vim /etc/php-fpm.d/www.conf 
Find the following two lines and uncomment listen.owner = nobody 
listen.group = nobody 
Find the following two lines and change their respective apache to nginx 
user = apache -> user = nginx 
group = apache -> group = nginx

yum install -y mariadb mariadb-server
#Startup automatically[root@ln-125 ~]# systemctl start mariadb.service
[root@ln-125 ~]# systemctl enable mariadb.service
#Initialize database configuration mysql_secure_installation #Configure default settings (root password login method, etc.)
#Set the default character set to edit vim /etc/my.cnf
[root@ln-125 ~]# grep -Ev '^#|^$' /etc/my.cnf
[mysqld]
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
symbolic-links=0
character-set-server = utf8 ##Set the default encoding [mysqld_safe]
log-error=/var/log/mariadb/mariadb.log
pid-file=/var/run/mariadb/mariadb.pid
!includedir /etc/my.cnf.d

systemctl restart mariadb.service

cat >> /usr/share/nginx/html/index.php << EOF
<?php 
echo phpinfo();  
?>