#
SSH
#
Check if we can login as root
grep PermitRootLogin /etc/ssh/sshd_config
#
Have access to ssh private key
Copy the key to our local computer.
chmod 600 root_key
ssh -i root_key root@10.10.10.100
#
Generate a public&private ssh key pair
Add our public ssh key to authorized_keys file.
ssh-keygen -f mykey
cat mykey.pub # you can copy this to authorized_keys
chmod 600 mykey
ssh -i mykey user@10.10.10.11