如何使用PHP exec（）在后台执行远程SSH命令？

Question

Is there a simple way to execute SSH commands in the background on remote machines from PHP without using ssh2_* ? The PHP script is executed by the user from bash (no Apache involved), so it's not an issue of rights. I've tried doing this:

exec("ssh -f -o UnknownHostsFile=/dev/null -o StrictHostKeyChecking=no -i {$keyFile} {$user}@{$ip} {$remoteCommand} 2>&1 >/dev/null </dev/null");

For example:

exec("ssh -f -o UnknownHostsFile=/dev/null -o StrictHostKeyChecking=no -i /home/data/id_rsa user@192.168.0.19 '/home/user/script.sh ; exit' 2>&1 >/dev/null </dev/null");

All PHP variables have been escaped with escapeshellarg() and $remoteCommand is a bash script on the remote machine that sleeps for a few minutes and then starts executing some commands.

My problem is that if I execute that SSH command from bash, it gives control back to bash immediately. If I execute it from php using exec() it waits until the remote command executes. I've tried adding 2>&1 >/dev/null </dev/null after /home/user/script.sh , but the execution still doesn't return control to the PHP script.

Answer 1

我认为您在将执行发送到后台的命令末尾缺少＆ 。