Syslog Server Analyzing and Storing Logs - RHCSA

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OpenSSH (Secure Shell) Server and Client Configuration - RHCSA

1. A cryptographic handshake is made so that the client can verify that it is communicating with the correct server.

2. The transport layer of the connection between the client and remote host is encrypted using a symmetric cipher.

3. The client authenticates itself to the server.

4. The client interacts with the remote host over the encrypted connection.



openssh-server package installed

X11 forwarding

ssh -Y username@hostname





ssh -L local-port:remote-hostname:remote-port username@hostname



sshd(8) — The manual page for the sshd daemon documents available command line options and provides a complete list of supported configuration files and directories.

ssh(1) — The manual page for the ssh client application provides a complete list of available command line options and supported configuration files and directories.

scp(1) — The manual page for the scp utility provides a more detailed description of this utility and its usage.

sftp(1) — The manual page for the sftp utility.

ssh-keygen(1) — The manual page for the ssh-keygen utility documents in detail how to use it to generate, manage, and convert authentication keys used by ssh.

ssh_config(5) — The manual page named ssh_config documents available SSH client configuration options.

sshd_config(5) — The manual page named sshd_config provides a full description of available SSH daemon configuration options.



SSH (Secure Shell) is a protocol which facilitates secure communications between two systems using a client-server architecture and allows users to log in to server host systems remotely. Unlike other remote communication protocols, such as FTP or Telnet, SSH encrypts the login session, rendering the connection difficult for intruders to collect unencrypted passwords.



The ssh program is designed to replace older, less secure terminal applications used to log in to remote hosts, such as telnet or rsh. A related program called scp replaces older programs designed to copy files between hosts, such as rcp. Because these older applications do not encrypt passwords transmitted between the client and the server, avoid them whenever possible. Using secure methods to log in to remote systems decreases the risks for both the client system and the remote host.

Red Hat Enterprise Linux includes the general OpenSSH package, openssh, as well as the OpenSSH

server, openssh-server, and client, openssh-clients, packages. Note, the OpenSSH packages require the

OpenSSL package openssl-libs, which installs several important cryptographic libraries, enabling

OpenSSH to provide encrypted communications.



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How to Get Help From Linux Command Line and Man Pages - RHCSA

Getting Help From Command Line



:: Getting Help From Command Line ::

Not most of the production Server will have access to internet, because of security reasons, wihtout internet access how you can get an help using your command line interface. which is not a step by step guide but it will give you an idea to execute the commands and how commands works.

In Order to get the help, we have to use below commands in most of the situations.

1. Man
2. Pinfo
3. Command --help
4. Info
5. Help command

Man is the system's manual pager. Each page arugument given to man is normally the name of program, utility or function.

1 Executable programs or shell commands
2 System calls (functions provided by the kernel)
3 Library calls (functions within program libraries)
4 Special files (usually found in /dev)
5 File formats and conventions eg /etc/passwd
6 Games
7 Miscellaneous (including macro packages and conventions), e.g. man(7), groff(7)
8 System administration commands (usually only for root)
9 Kernel routines [Non standard]

man ls

man -a intro

man -t alias | lpr -Pps

man -k printf

man -s 3 -K "open"

Spacebar – Scrolling man page down

PageDown/Down Arrow – Scrolling man page down

PageUp/Up Arrow – Scrolling man page UP

/string – Search for particular string

n (key) – Repeat search Up to down

N (key) – Repeat search Down to up

g – Go to first to man page

G  – Go to end of the man page

q – Exit from man page

pinfo

info

Whereis

whatis

command --help

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