Experts have hands-on practice and skills to resolve system issues. Daily, working and doing regular operations on the system, they get expertise. Even they understand other system processes for which they have theoretical knowledge. The technical staff of most enterprises is involved in configuring application servers, networks, and system security.

Learning each command with all its parameters needs a lot of practice, and no one is a complete master. Most Linux commands we forget as they do not come in use over a while.

When an expert encounters an issue, they start searching for information online and browsing technical forums. For almost 90% of such, they have help documents, instructions, and FAQs. The 10% depends on their ability or by asking others about the resolution process. The technical experts, senior operation and maintenance engineers, or system architects keep themselves updated with highly comprehensive knowledge of programming language and cluster & distributed architecture.

The Linux distros come with minimum requirements, recommended configurations, and installation options (such as a graphical interface or character interface). The organizations may have different setup planning for hosting servers. Administrators use the Kickstart tool for unattended Linux system installation. They create ‘ks.cfg‘ response file through various parameters or settings that need manual intervention in the typical installation process.

CHANGE THE PORT OF THE SERVER

vi /etc/ssh/sshd_config

change #Port 22

to Port 8022

/etc/init.d/sshd restart

CREATING DOMAIN ENTRY

vi /etc/named.conf

cd /var/named/

CHECKING ERROR LOGS

tail -f /usr/local/apache/logs/error_log