Drush giving Killed on Shared Rackspace

My last night ruined due to this.

Here is the complete story.

I have installed composer on Rackspace. Then i installed drush with composer(composer requires drush/drush:8.*).

But i was able to run drush only from ~/.composer/vendor/bin/drush/drush. But not from drupal root.

Here was the error i was getting:


 drush cr 

I have increased php memory limit from php.ini and in settings.php of drupal as well. But no luck.

At the end following solutions works.

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