Linux UpSkill Challenge Day 3 - Power trip

• https://linuxupskillchallenge.org/03/

# view last logins
last
last root
sudo lastb

# check configurations b4 reloading daemon
sshd -t
nginx -t

sshd log location: /var/log/auth.log

incredible: figlet [word]

• Medium - SSH hardening

for SSH hardening: generate list of primes, select eligible primes, copy to appropriate directory

sudo su
ssh-keygen -M generate -O bits=2048 moduli-2048.candidates
ssh-keygen -M screen -f moduli-2048.candidates moduli-2048
rm /etc/ssh/moduli
mv moduli-2048 /etc/ssh/moduli
sshd -t
systemctl restart sshd
exit

EOF