SSH is a network protocol. It allows data to be exchanged using a secure channel between two networked devices.
\nSame protocol is used for:<\/p>\n
ssh
\nsftp
\nscp<\/p>\n
RPM packages required to rum ssh includes:<\/p>\n
Openssh.rpm
\nOpenssh-client.rpm
\nOpenssh-server.rpm<\/p>\n
The configuration files of ssh are:<\/p>\n
\/etc\/ssh\/ssh_config : for configuring client
\n\/etc\/ssh\/sshd_config : for configuring server<\/p>\n
When ssh is executed for the first time a file \/root\/.ssh\/known_hosts is created.<\/p>\n
This file contains public keys and IP addresses of remote hosts.
\n# ssh user1@remotehost.com Password-less communication<\/p>\n
By the following setup a client should be able to access a server via ssh without typing a password every time.<\/p>\n
Login to the clients box
\n# cd \/root\/.ssh (or which ever user)
\n# ssh-keygen -t rsa : Without entering anything keep pressing enter
\nThe above will create two files id_rsa & id_rsa.pub
\nCopy the contents of id_rsa.pub to the server. Copy it into the home directory of the user as whom you will be login in. Copy it into \/home\/username\/.ssh\/ authorized_keys<\/p>\n
Adding security to ssh<\/p>\n
Users can be allowed or denied access to ssh by adding the following entries in \/etc\/ssh\/sshd_config
\nallowusers abc : To allow abc
\ndenyusers abc : To deny abc<\/p>\n","protected":false},"excerpt":{"rendered":"