script/guide_ssh_using_key.txt at master · alochym01/script · GitHub

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Network topology
1.	server with IP: 172.30.41.38, client is any computer

Set to setup
1.	on server:
	- run cli: ssh-keygen
	- the result is in ~/.ssh/
drwx------  2 inf inf 4096 Oct 21 00:11 ./
drwxr-xr-x 14 inf inf 4096 Oct 21 00:10 ../
-rw-rw-r--  1 inf inf  392 Oct 21 00:11 authorized_keys
-rw-------  1 inf inf 1679 Oct 21 00:10 id_rsa
-rw-r--r--  1 inf inf  392 Oct 21 00:10 id_rsa.pub

	- run cli: cd ~/.ssh
	- run cli: cat id_rsa.pub > authorized_keys
ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQCuIqXqVxmrGVhSXfUeXbItQWhO/HlhieDTH6pJDYxmVcl+/Yb6LxKtEfywbpQ51W0CUaKbc9Ir8w2lglt8Un2IB1JcekO87BwxhMuQtbwXvXdHnLTSxx79KVpKr/7ZBfdpOyIX9VYmc7hIx0a8mZOzFqRUOzXzv+SgJrUR3dn8BnwUiOL0/j2cD5KqVipGHkFQYNrOtureLoIIYIiXNnsQ/qfiuRq65SwewDUH11y5J3YkNSAuXCXYNQ81hJLs8uefKB0+nhkW7qVbUtNls3GNoQpql1Z6Lj44B0vfrDnrOa/Aqz2XuusZ8thK+hTQs445GGKw0Rrx4UZSwyapM6R5 inf@ubuntu

2.	on client
	- copy the content id_rsa of the server into its local storage - abc.txt
	- chmod 600 abc.txt or you will get the error
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@         WARNING: UNPROTECTED PRIVATE KEY FILE!          @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
Permissions 0664 for 'id_rsa_ubuntu' are too open.
It is required that your private key files are NOT accessible by others.
This private key will be ignored.
bad permissions: ignore key: id_rsa_ubuntu
inf@172.30.41.38's password:

	- run cli: ssh -i abc.txt username@server_ip_address
	- example: ssh -i abc.txt inf@172.30.41.38