Network diagram
See Figure 146.
Figure 146: Network diagram
This network comprises the following devices (all hosts are running Linux):
DNS—DNS server used to resolve the domain name apm-test.com. It is deployed with BIND v9 and supports round robin load balancing.
Web1/Web2—Web servers that provide web services.
MySQL-M/MySQL-S—Database servers deployed with MySQL. The replication function is enabled for MySQL. MySQL-M is the primary server. MySQL-S is the secondary server and it backs up the data and uploads the backup data to the FTP server every day.
FTP—FTP server deployed VSFTP. It receives backup data from MySQL-S every day.
SW1—Layer 3 switch that provides network access services and performs access control for all servers.
Administrators required for the network include:
Administrator A—Performs routine network maintenance. As a member of the operator group Administrator Group, administrator A has the Admin privilege and manages all servers, network devices, BIND, and VSFTP.
Administrator B—Updates and publishes web pages. As a member of the operator group Web Group, administrator B has the maintainer privilege and manages Web 1, Web 2, Apache, and PHP.
Administrator C—Performs routine database maintenance and optimization. As a member of the operator group DB Group, administrator B has the maintainer privilege and manages MySQL-M, MySQL-S, and MySQL.
Administrator D—Monitors services 24 hours a day, 7 days a week. As a member of the operator group 7*24 Monitor Group, administrator D has the viewer privilege.