Modelo de alta disponibilidade em cluster usando ferramentas open source

Abstract

The high availability system (SAD) is a technology that allows the elimination of points of failure for applications and guarantee the continuity of your business. In Mozambique there are already companies that use this technology, they are distributed by the sectors of Communications, Finance, Banking, Transport and Services. There are several factors that lead several institutions to adhere to high availability services, the main ones being market competitiveness and the need to increase income. This work focuses on all aspects of high availability and the various techniques that can be found in these systems. The file systems that can be found on UNIX systems, whose main focus is journalling, are described. A system of this nature is designed taking into account all the points of failure that may occur, without taking into account the electrical current component and, finally, the high availability system is implemented. Among the main reasons that lead to the adherence of high availability technology in an Open Source environment, the fact that the technological infrastructure is of low cost stands out, the benefits resulting from high availability services constitute a motivation for its adoption and, the the fact that most companies, large and small, consider that their customers are so demanding and cannot wait that long for their services to be replaced when they are not available when needed. The extent to which small businesses can also implement these systems within their businesses at low cost is illustrated.