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Status: published
Programming, Software and application
2022-01-09 18:30:29
SSH
1445
You are new to Linux and switch to the Linux Operating System, this is a tutorial for you. This will help you to start your journey in the Linux system because when you perform daily operations in this system, you will not stack on it.
After installing the OS, we need some basic applications to do our daily operation such as browser, zoom, skype. If we are a developer then we need some development tools like Node.Js and NPM, PHP, phpMyAdmin, MySQL, Apache, Tomcat, DBreaver etc. This tutorial will cover all of this.
Important thing is when you enable the installation of those applications, you will learn many things regarding Linux OS.
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SSH:
The Secure Shell Protocol is a cryptographic network protocol for operating network services securely over an unsecured network. Its most notable applications are remote login and command-line execution. SSH applications are based on a client–server architecture, connecting an SSH client instance with an SSH server.
SSH connection:
ssh -p 22 oracle@IP
SSH connection problem with "Host key verification failed..." error
"Host key verification failed" means that the host key of the remote host was changed.
SSH stores the host keys of the remote hosts in ~/.ssh/known_hosts. You can either edit that text file manually and remove the old key (you can see the line number in the error message), or use
ssh-keygen -R hostname
From man page:
-R hostname
Removes all keys belonging to hostname from a known_hosts file. This option is useful to delete hashed hosts .