Sample Questions from Red Hat Certified Engineer (RHCE)

Preview a few questions below — answers are revealed when you take the exam.

1. A team needs to configure a high-availability setup for a critical web application using Red Hat Enterprise Linux. The application must remain available even if one server fails. What approach should they take?

   • Implementing a load balancer with two web servers in active-passive mode, ensuring that the passive server takes over if the active server fails.
   • Setting up a clustered file system with automatic failover capabilities between two servers to maintain data integrity and availability.
   • Configuring a pacemaker cluster with corosync for communication, and using resource agents to manage the web application service across multiple nodes.
   • Deploying the web application on a single server with redundant hardware components, such as dual power supplies and network interfaces, to enhance reliability.

2. Consider the situation where a Red Hat Enterprise Linux server is experiencing intermittent network connectivity issues. Which method solves it best?

   • Rebooting the server to reset all network configurations and services.
   • Using the 'nmcli' command to restart the network manager service and reapply the network configurations.
   • Checking the system logs for any error messages related to network interfaces or services, and addressing the root cause based on the log entries.
   • Disabling and re-enabling the network interface using the 'ifconfig' command to temporarily resolve the connectivity issues.

3. Which option best evaluates the security implications of running a web server with default settings on a Red Hat Enterprise Linux system?

   • Assessing the risk of exposing sensitive data and potential vulnerabilities by analyzing the default configuration files and comparing them against security benchmarks.
   • Disabling all network services except for the web server to minimize the attack surface and reduce the risk of unauthorized access.
   • Implementing a web application firewall (WAF) to filter malicious traffic and protect the web server from common attack vectors.
   • Regularly updating the web server software and applying security patches to address known vulnerabilities and enhance overall security posture.

4. How should a professional assess the performance impact of running multiple resource-intensive applications on a single Red Hat Enterprise Linux server?

   • Monitoring system resource usage, such as CPU, memory, and disk I/O, using tools like 'top' or 'htop' to identify any bottlenecks or performance degradation.
   • Configuring process priorities using the 'nice' and 'renice' commands to allocate more CPU resources to critical applications and improve overall system performance.
   • Implementing containerization technologies, such as Docker or Podman, to isolate applications and optimize resource utilization on the server.
   • Upgrading the server hardware, such as adding more RAM or faster CPUs, to accommodate the increased resource demands of the applications.

5. What strategy should be applied when migrating a legacy application from an older version of Red Hat Enterprise Linux to a newer release?

   • Performing a parallel installation of the new release alongside the existing system, gradually migrating applications and data to the new environment.
   • Conducting thorough compatibility testing of the legacy application on the new release to identify any potential issues or incompatibilities.
   • Utilizing containerization technologies to encapsulate the legacy application and its dependencies, ensuring compatibility with the new release.
   • Engaging with the application vendor or developer community to obtain updated versions or patches compatible with the newer release of Red Hat Enterprise Linux.