RHCSA Practice Exam
RHCSA Practice Exam A Here are some tips to ensure your exam starts with a clean environment: After applying these tips, you’re ready to get started. Good luck! Answers: Reset the root password on boot If you are…
David Cao
David is a Cloud & DevOps Enthusiast. He has years of experience as a Linux engineer. He had working experience in AMD, EMC. He likes Linux, Python, bash, and more. He is a technical blogger and a Software Engineer. He enjoys sharing his learning and contributing to open-source.
5 formas de verificar la dirección IP en Linux
Cómo verificar la dirección IP en Linux En el entorno de Linux, es esencial poder verificar la dirección IP de su sistema. La dirección IP es un identificador único asignado a cada dispositivo conectado a una red, lo que le…
50 RHCSA exam questions and answers
The RHCSA (Red Hat Certified System Administrator) exam is a performance-based certification exam offered by Red Hat. It is designed to validate the skills and knowledge required to effectively administer Red Hat Enterprise Linux systems in various enterprise environments. The…
Understanding Linux MAC Addresses: 10 Common Questions Answered
This article is part of the following series. Understanding MAC address in Linux In Linux, a MAC address (Media Access Control address) is a unique identifier assigned to a network interface. It is a hardware address that is associated…
Search files by size in Linux
There are a few different ways to search files by size in Linux. One way is to use the find command. The find command is a powerful tool that can be used to search for files based on a variety…
2 ways to fix could not load server certificate file ‘server.crt’: No such file or directory in PostgreSQL
The error “could not load server certificate file ‘server.crt’: No such file or directory” in PostgreSQL indicates that the server is unable to find the server.crt file, which is required for SSL connections. If you don’t need that, set “ssl…
Enable SSL in Postgresql
Enabling SSL in PostgreSQL is a straightforward process that only requires three simple steps: Obtain server certificate and key files for Postgres On PostgreSQL server, we need 3 certificates in data directory for SSL configuration. They are: In…
2 ways to Preserve file permissions when copying files in Linux
Preserve file permissions using -p option in cp command To preserve the file permissions when copying files or directories using the cp command, you can use the -p or –preserve option. The -p option will preserve the following attributes of…
2 ways to fix cp Permission denied error
The error message “cp: Permission denied” typically occurs when the user doesn’t have permission to access the source file or the destination directory. Here are the errors we usually meet with “cp Permission denied” error in Linux: Error Description cp:…
3 ways to fix Did not find any relations in Postgresql
When running the \dt command in PostgreSQL, the error message “Did not find any relations” means that no tables were found in the current schema that is visible to the user running the command. In PostgreSQL, the \dt command is…