A Linux system administrator wears many hats. The smaller the surroundings, the more hats you will wear. Linux administration includes backup, file recovery, disaster recovery, new system build, hardware maintenance, automation, user maintenance, file system management, application installation and configuration, system security management and 'storage. System administration covers almost all aspects of hardware and software management for physical and virtual systems.
Oddly enough, a broad knowledge base is also required on network configuration, virtualization, interoperability and even Windows operating systems. A Linux system administrator must have technical knowledge of network security, firewalls, databases and all aspects of a functioning network. This is because you are primarily a Linux SA, but you are also part of a larger support team that often has to work together to solve complex problems. Security is somehow often at the root of the problems a support team faces. A user may not have adequate or excessive access. A daemon may not have the correct permissions to write to a registry directory. A firewall exception was not saved to the running configuration of a network appliance. There are hundreds of errors on a network. Your job is to spot and correct mistakes.
Linux system administration also requires you to understand best practices, learn new software, maintain patches, read and follow security notifications, and apply hardware updates. The day of an SA is very intense. In fact, you never really give up, but you have to choose a time when you want to end your activities. Being an SA is a 24x7x365 job that makes you physically and mentally stressed. You will hear a lot about burnout in this area. We at Enable Sysadmin have written several articles on the subject.
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