无法从php中的exec或shell_exec执行aws cli命令

Question

I installed aws cli on my local Ubuntu 18.04 development machine. It works fine from the terminal for example if i type:

$which aws I get: /usr/local/bin/aws . However, if i try to run this command from within a php script it does nothing.

$cmd ="aws --version";

try {
    $exec = exec($cmd,$output, $return);
    $exec2 = shell_exec($cmd);
}
catch(Exception $e)
{
    echo 'Message: ' .$e->getMessage();
}

exec2 returns null exec returns 127.

Now I understand that this is a paths issue and I have tried to add it to the path but it does not work.

I know this can be done using the php sdk but for various reasons i cant use that.

Can someone explain how to get this working on ubuntu 18.04 with php?

Answer 1

My code was working all along. The issue was that I had to redirect stdout to stderr using 2>&1 at the end of the command.

 $cmd = "aws redshift restore-table-from-cluster-snapshot --cluster-identifier {$this->redshift_cluster_identifier} --snapshot-identifier {$this->snapshot_identifier} --source-database-name citnow --source-table-name {$tableName} --target-database-name citnow --new-table-name {$newTableName} 2>&1";
        $exec = exec($cmd,$output, $return);