configure new VPS

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user

add new user

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adduser ubuntu  # new user's direction automatically
useradd ubuntu  # need to new dir manually

add user to admin group / edit sudoers

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groupadd superadmin
usermod -g superadmin ubuntu
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adduser ubuntu --ingroup sudo  # new user and assign to sudo group
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vim /etc/sudoers

user state

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id ubuntu

upload public key

method1

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ssh-keygen

new file authorized_keys and paste your own public key into this file.

method2

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ssh-copy-id -i .ssh/common.pub root@ip:port

automatically upload public key.

change login method

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cd /etc/ssh
vim sshd_config
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RSAAuthentication yes
PubkeyAuthentication yes
PermitRootLogin no
PasswordAuthentication no

restart ssh service

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service ssh restart

log

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cd /var/log

auth.log: authentication log