Date Posted:04-05-2017<\/strong><\/p>\n Using password based login is always security risk. Incase if the password is known to others then it will be easy for them to access the machine. To overcome this situation, its always good to create a user and login without password ie., key based authentication.<\/p>\n Let’s start with create a private\/public key pair on the local machine. We can use puttygen to create a private and public key. While creating the keypair, drag over the area to generate a random key. Once, the key generated click on\u00a0Save Private key\u00a0<\/strong> to save the private key. Copy the key from public key<\/em> area and we will be needing this key on the destination server.<\/p>\n Incase of linux machine, execute the below command to generate private\/public key pair. While executing the command, it may ask for pass-phrase key. We are not going to use\u00a0pass-phrase\u00a0<\/em>to make the process simple.<\/p>\n The above command will create two files<\/p>\n id_rsa – This is a private key<\/p>\n id_rsa.pub – This is a public Key. We will be using this key on the server to authenticate the user. This is similar to the key which is on puttygen from windows.<\/p>\n Login to the server and create a new user.<\/p>\n Create necessary directory and modify the permissions, ownership<\/p>\n Create\u00a0authorized_keys\u00a0<\/em>file on the user directory. We had already generated the public key<\/em>\u00a0on the linux machine or windows machine.<\/p>\n Copy the key and paste it on authorized_keys file.<\/p>\n Modify the ownership and permission of the authorized_keys file.<\/p>\nPrerequisites:<\/h4>\n
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Implementation:<\/h4>\n
ssh-keygen -t rsa<\/code><\/p>\nuseradd admin<\/code><\/p>\nmkdir \/home\/admin\/.ssh<\/code>
\n chown admin. \/home\/admin\/.ssh<\/code>
\n chmod 700 \/home\/admin\/.ssh\/<\/code><\/p>\nvi \/home\/admin\/.ssh\/authorized_keys<\/code><\/p>\nchown admin.\u00a0\/home\/admin\/.ssh\/authorized_keys<\/code><\/p>\n