Learn Linux Systems Administration

To become proficient in Linux Systems Administration, you can follow the step-by-step guide outlined below. The tutorial will cover various aspects of Linux administration and introduce yo u to essential tools and technologies.

Requirements

• KVM Hypervisor
• Rocky Linux as the base distribution for all work

Tutorial Steps

1. Set up a KVM Hypervisor: Install and configure a KVM hypervisor on your machine. This will enable you to create and manage virtual machines (VMs).

2. Install Foreman/Katello: Deploy a Foreman/Katello server within the KVM hypervisor. Use Rocky Linux as the base distribution. Foreman is a complete lifecy cle management tool, while Katello adds content and subscription management capabilities. This step provides a centralized management platform for the lab environment.

3. Configure DNS and DHCP: Create a VM within the KVM hypervisor to provide named (DNS) and dhcpd (DHCP) services to your environment. DNS translates domain names to IP addresses, whil e DHCP automatically assigns IP addresses to devices. This step ensures proper name resolution and IP allocation within the lab.

4. Implement LDAP Authentication: Utilize the Foreman/Katello server to automatically install a pair of OS instances, which will serve as Master/Master LDAP servers. LDAP (Lightweight Directory Access Protocol) is a protocol for accessing and maintaining distributed directory information services. Implementing LDAP authentication centralizes user management and enhances security across the lab.

5. Configure LDAP Authentication: Reconfigure all three servers (Foreman/Katello, DNS/DHCP, LDAP) to use LDAP authentication. This step ensures that all services and systems in the lab utilize LDAP for user authentication, enhancing consistency and security.

6. Deploy Postgresql VMs: Create two new VMs and set them up as Postgresql servers. Use pgpool-II to establish master/master replication between the servers. Postgresql is a powerful o pen-source relational database management system. Setting up master/master replication ensures data redundancy and high availability within the lab.

7. Set up Ansible: Install and configure Ansible. Ansible is an open-source automation tool that simplifies the deployment, configuration, and management of sys tems. Utilizing Ansible with the Foreman/Katello server allows for streamlined configuration and orchestration of the lab environment.

8. Configure iSCSI and NFS: Deploy a VM and install iscsitgt for iSCSI and nfs-kernel-server for NFS. iSCSI (Internet Small Computer System Interface) enables block-level storage acces s over IP networks, while NFS (Network File System) allows file-level access to remote storage. This step provides flexible and scalable storage solutions for the lab.

9. Install Bacula for Backup: Deploy another VM and install Bacula using the Postgresql cluster for database storage. Bacula is an open-source network backup solution. Configuring Bacula for backups ensures data protection and recovery capabilities within the lab.

10. Deploy Apache HTTP Servers: Deploy two VMs with Apache HTTP servers. Apache HTTP Server is a widely-used web server software. This step sets up web ser ver instances that can serve web content within the lab.

11. Set up Tomcat with JBoss Cache: Deploy two VMs and install Tomcat on them. Configure JBoss Cache

12. Implement Load Balancing: Deploy another VM for iptables-based NAT/round-robin load balancing between the two Apache HTTP servers.

13. Configure Postfix for Email: Install Postfix on a VM and set it up to use a Gmail account for sending emails and receiving messages only from the internal network.

14. Set up Zabbix for Monitoring: Deploy a VM and configure it as a Zabbix server. Use SNMP to monitor the communication state of relevant services in the environment. Check if the cor rect ports are open.