Add SFTP user

gistfile1.sh

# Add new user group 
groupadd sftpusers

# Add new user set the directory, the main role and the user name
useradd -g sftpusers -d /dir -s /sbin/nologin username

# Make sure the user can perform SSH login
usermod username -s /sbin/nologin

# Make sure the user has been added
grep username /etc/passwd

# Set the user password
passwd username

Edit the following file /etc/ssh/sshd_config

#Subsystem sftp /usr/libexec/openssh/sftp-server
Subsystem sftp internal-sftp

Match Group sftpusers
ChrootDirectory /
ForceCommand internal-sftp
AllowTcpForwarding no

# Set the directory owner user:group format 
chown -R checkout:sftpusers /dir

# Reset permissions
chmod 755 /dir

# Reload or Restart the SSH service
sudo service ssh reload

service ssh restart

/etc/init.d/ssh restart