I have found an interesting article on how to use ssh to update your WordPress blog instead of the default method (FTP/FTPS).

The steps are the following :

• create a new user account
  adduser wp-user
• set the security rights for the files and the folders on the WordPress path (for the example, the WordPress directory path is /var/www/html)
  cd /var/www/html
  find . -type d -exec chmod 0755 {} \;
  find . -type f -exec chmod 0644 {} \;
• set the file ownership to the new user account
  chown -R wp-user:wp-user /var/www/html
• create a RSA keypair (both public and private keys)
  ssh-keygen -t rsa -b 4096
  When prompted, enter /home/wp-user/wp_rsa

  Info : do not set the passphrase. Just leave it blank and type “Enter”. Otherwise, it will not work. Do not hesitate to leave a comment if you have a tip to do it works with a passphrase…
  

• Set the security and the ownership on the key files/folders
  chown wp-user:www-data /home/wp-user/wp_rsa*
  chmod 0640 /home/wp-user/wp_rsa*

  mkdir /home/wp-user/.ssh
  chown wp-user:wp-user /home/wp-user/.ssh/
  chmod 0700 /home/wp-user/.ssh/
  cp /home/wp-user/wp_rsa.pub /home/wp-user/.ssh/authorized_keys
  chown wp-user:wp-user /home/wp-user/.ssh/authorized_keys
  chmod 0644 /home/wp-user/.ssh/authorized_keys

• To restrict the key usage to the local computer, add the following text at the beginning of the file /home/wp-user/.ssh/authorized_keys before ssh-rsa
  from=”127.0.0.1″ ssh-rsa…
• Add the following packages :
  apt-get update
  apt-get install php5-dev libssh2-1-dev libssh2-php
• Edit your wp-config.php and add these lines at the end :
  define(‘FTP_PUBKEY’,’/home/wp-user/wp_rsa.pub’);
  define(‘FTP_PRIKEY’,’/home/wp-user/wp_rsa’);
  define(‘FTP_USER’,’wp-user’);
  define(‘FTP_HOST’,’127.0.0.1:22′);
• Restart Apache
  service apache2 restart

Reference

Source

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