[ssh] sshd_config 설정

sshd_config 수정

sudo vi /etc/ssh/sshd_config

# /etc/ssh/sshd_config

Port 22

ListenAddress 0.0.0.0
ListenAddress ::

# root 로그인 비활성화
PermitRootLogin no

StrictModes yes
MaxAuthTries 6
MaxSessions 10

# 클라이언트가 300초 동안 입력이 없으면 연결을 종료시킴
TCPKeepAlive yes
ClientAliveInterval 300
ClientAliveCountMax 0

PasswordAuthentication no
PermitEmptyPasswords no

PubkeyAuthentication yes

# Expect .ssh/authorized_keys2 to be disregarded by default in future.
# The default is to check both .ssh/authorized_keys and .ssh/authorized_keys2
# but this is overridden so installations will only check .ssh/authorized_keys
AuthorizedKeysFile      .ssh/authorized_keys

수정 후 ssh 서비스 재시작

sudo systemctl restart ssh  # ubuntu
sudo systemctl restart sshd # centos