Operating Systems and Application Servers

How to fix error “Failed to download metadata for repo AppStream… in CentOS”?

21 July 2022
CentOS, Linux
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How to fix error "Failed to download metadata for repo AppStream... in CentOS"? When you run yum update, you may see error said "Failed to download metadata for repo AppStream...",…Read more →

How to install bootstrap 5 and make it work with Ruby 2.7.2 + on Rails 6.1 +

29 November 2021
PostgreSQL 12, Programming, Ruby On Rails, Ubuntu LTS 20.04, VC(Visual Studio Code)
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Rails 6 follow webpacker, you don't need to install a gem, do this instead In your Rails home directory, run this command, to install jQuery, popper.js and bootstrap, jQuery and…Read more →

How to upgrade Node.js from v10.19.0 to v12.13.0 in Ubuntu 20?

23 November 2021
Ubuntu, Ubuntu LTS 20.04
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Key words: Ruby on Rails,node.js, webpack and stimulus,Ubuntu 20 problem to solve: error tailwindcss@2.2.19: The engine "node" is incompatible with this module. Expected version ">=12.13.0". Got "10.19.0" how to fix?…Read more →

How to solve “Failed to download metadata for repo ‘pgdg94’ “?

27 October 2021
CentOS, Linux, Operating Systems and Application Servers, PostgreSQL, PostgreSQL 11, PostgreSQL 12, VirtualBox
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OS: Cent OS 8 Task: check if there is security update then update security only if there is any security update problem to solve: Run 'yum --security check-update' to see…Read more →

Useful Linux Command

3 July 2020
CentOS, Linux, Trick Treat Cheat Sheet, Ubuntu, Ubuntu LTS 18.04, Ubuntu LTS 20.04
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How to search and replace a word in file in Linux? sed -i 's/original/new/g' file.txt Explanation: sed = Stream EDitor-i = in-place (i.e. save back to the original file)The command string:s = the…Read more →

How to stress test SQL Server 2019 Developer Edition on Ubuntu LTS 18.04

3 July 2020
Linux, MS SQL Server 2019, Ubuntu LTS 18.04
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30 June 2020
Linux, MS SQL Server, MS SQL Server 2019, Ubuntu
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