Security issues in small Linux networks

A case study of an intrusion into a Linux cluster for parallel computing is presented, along with an approach used by the authors to make the system less vulnerable to future intrusions.Linux clusters have revolutionized computing by providing access to modern software technologies at lowcost.However, such clusters are vulnerable, and often managed by administrators lacking both the time and knowledge to deal adequately with security issues.The newly modified system discussed by the authors attempts to balance the needs of accessibility and security at relatively low cost in terms of time and money.PemGsion to make digital or hard copies of all a part of this wait for personal or classroom use is ganted withcut fee provided that copies are not made oc distributed for profit or commercial advantage and that copies bear this notice and the tkll citation on the first page.To copy otherwise,