Linux Advanced Questions

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How can you enhance the security of a Linux system?
Enhancing Linux security can involve steps such as keeping the system updated, using strong passwords, minimizing the use of root access, configuring firewalls, and enabling SELinux or AppArmor.

Can you describe load balancing and how it works in Linux?
Load balancing distributes workloads across multiple computing resources. In Linux, this can be achieved with software like Nginx or HAProxy.

Explain the role of SSH in Linux. How can it be secured?
SSH (Secure Shell) is a protocol to securely connect to a remote server. It can be secured by using key pairs for authentication and disabling root login.

Describe a situation where you might use 'chroot' in Linux administration.
chroot changes the root directory for the current running process and its children. It's commonly used in system recovery, running older versions of software, and testing new software.

How does Linux use swap space? How should it be sized relative to system memory?
Swap space is used when the physical memory (RAM) is full. It should be sized depending on your system's memory, workload, and performance requirements, with general guidance often suggesting an amount 1-2 times the size of RAM.

Explain LVM and why it might be used on a Linux server.
LVM (Logical Volume Management) allows for more flexible disk management. It can create a virtual layer over physical storage, allowing for easier resizing and management of disk space.

What is SELinux and how does it improve Linux security?
SELinux (Security-Enhanced Linux) provides additional access control mechanisms beyond traditional ones in Linux. It helps limit the damage from a compromised system.

Explain the concept of virtualization in Linux. How do tools like Docker and Kubernetes fit into this?
Virtualization allows for running multiple operating systems on a single physical machine. Docker is used for containerization, while Kubernetes is a system to manage containerized applications.

How do you automate system tasks in Linux? What tools would you use?
You can automate system tasks in Linux using shell scripts, or tools like Cron and Anacron for scheduling.

What are the different fields in /etc/passwd and /etc/shadow files?
/etc/passwd contains user information and /etc/shadow stores actual password in encrypted format. They contain fields for username, password (in passwd it's 'x' indicating that the actual hash is in shadow), user ID, group ID, home directory, shell, etc.

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