Step.1 Change OS basic configuration on FTP Server

Step.1-1 Stop SELINUX and Firewall

sudo setenforce 0
sudo sed -i -e 's/=permissive/=disabled/g' /etc/selinux/config
sudo systemctl stop firewalld.service
sudo systemctl disable firewalld.service

Step.1-2 Change OS users password rule (DO NOT for PRODUCTION Services)

grep 'password    requisite     pam_pwquality.so' /etc/pam.d/system-auth
grep '= enforce_for_root' /etc/pam.d/system-auth
sudo sed -i -e 's/= enforce_for_root/= /g' /etc/pam.d/system-auth
grep -v '^#' /etc/security/pwquality.conf
sudo sed -i -e 's/ucredit/#ucredit/g' /etc/security/pwquality.conf
sudo sed -i -e 's/ocredit/#ocredit/g' /etc/security/pwquality.conf
echo "ucredit = 0" >> /etc/security/pwquality.conf
echo "ocredit = 0" >> /etc/security/pwquality.conf

Step.2 FTP Server Installation on OracleLinux7

Step.2-1 Create user and FTP data directory

sudo groupadd -g 55555 ftpgrp
sudo useradd -u 55555 ftpuser -g 55555 -G ftpgrp
sudo echo "ftpuser" | passwd --stdin ftpuser
sudo mkdir -p /var/nfs/ftp
sudo chown ftpuser:ftpgrp /var/nfs/ftp
sudo sed -i -e 's/authtok_type=/authtok_type= enforce_for_root/g' /etc/pam.d/system-auth

Step.2-2 Modify Config file

sudo sed -i -e 's/anonymous_enable=YES/anonymous_enable=NO/g' /etc/vsftpd/vsftpd.conf
sudo sed -i -e 's/#chroot_l/chroot_l/g' /etc/vsftpd/vsftpd.conf
sudo sed -i -e 's/chroot_local_user=NO/chroot_local_user=YES/g' /etc/vsftpd/vsftpd.conf
sudo sed -i -e 's/listen=NO/listen=YES/g' /etc/vsftpd/vsftpd.conf
sudo sed -i -e 's/listen_ipv6=YES/listen_ipv6=NO/g' /etc/vsftpd/vsftpd.conf
echo pasv_enable=YES >> /etc/vsftpd/vsftpd.conf
echo user_config_dir=/etc/vsftpd/user_conf >> /etc/vsftpd/vsftpd.conf
mkdir /etc/vsftpd/user_conf
touch /etc/vsftpd/user_conf/ftpuser
echo local_root=/var/nfs/ftp > /etc/vsftpd/user_conf/ftpuser
echo ftpuser >> /etc/vsftpd/chroot_list

Step.2-3 Restart service

systemctl restart vsftpd
systemctl status vsftpd

Step.3

Step.3-1 Install FTP Client

sudo yum -y install ftp

Step.3-2 Confirm FTP Connection

ftp ftpuser@localhost