The Talend Administration Center web application allows you to run tasks as different UNIX system users, through the Run As option. To avoid errors when starting the task on the server, you need first to:
give specific permissions to some server directories.
give necessary authorizations to the directories and files created by Talend JobServer by configuring the umask.
define the Operating System users allowed to run tasks from the server.
For more information on this feature, see the Talend Administration Center User Guide.