rsync: How to Use in a PHP File

I’m trying to send an image file from one server to another using rsync. The sending server’s public key has been placed into the receiving server’s /root/.ssh/authorized_keys . (I’ll not use root later on. Just trying to keep things as simple as possible for now.)

I can get an image copied successfully to the receiving server from the command line.

rsync -va /var/www/html/nameofimage.jpg root@111.222.333.444:/images/

However, I do not know how to write this into a PHP file. I thought this would work.

exec('rsync -va /var/www/html/nameofimage.jpg root@111.222.333.444:/images/');

But when this file is invoked from the command line, I receive the message … rsync: link_stat “/home/myusername/ssh” failed: No such file or directory (2) rsync error: some files/attrs were not transferred (see previous errors) (code 23) at main.c(1183) [sender=3.1.0]

Thanks for any direction with this.

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This question was answered by @TonyTsang:

Late reply, no notification for comment reply.

Seems you are missing the identity file (private key), you have three methods to specify the identity file

  1. Copy your key to /var/www/.ssh/id_rsa (id.dsa or id_ecdsa) & chmod 0600 /var/www/.ssh/id_rsa. Then let ssh search for it.

  2. Specify it with -i option:

rsync -e "ssh -o StrictHostKeyChecking=no,UserKnownHostsFile=/dev/null -i /path/to/your/private/key" --other-options-here
  1. Specify in config file /var/www/.ssh/config (chown www-data & chmod 0600 may be required) Edit it with following content:
Host name_of_your_choice
   Port 22
   User your_user_name_at_remote_machine
   PreferredAuthentications publickey
   IdentityFile /path/to/your/private/key

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