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sudo yum update

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LinuxЧÀÍÆ÷ĬÈÏÆô¶¯ÁËÐí¶à²»ÐëÒªµÄЧÀÍ£¬ÕâЩЧÀÍ¿ÉÄÜ»á³ÉΪ¹¥»÷ÕßÈëÇÖϵͳµÄDZÔÚÈë¿Ú¡£Ó¦¸Ã×ÐϸÉó²éЧÀÍÆ÷¿ªÆôµÄËùÓÐЧÀÍ£¬²¢Æ¾Ö¤ÏÖʵÐèÇó½ûÓò»ÐëÒªµÄЧÀÍ¡£ÒÔÏÂÊÇÔÚCentOSϵͳÖнûÓÃij¸öЧÀ͵ÄʾÀý´úÂ룺

sudo systemctl stop <service-name>
sudo systemctl disable <service-name>

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# Æô¶¯·À»ðǽЧÀÍ
sudo systemctl start firewalld

# ¿ªÆôSSH»á¼û
sudo firewall-cmd --zone=public --add-port=22/tcp --permanent
sudo firewall-cmd --reload

# ¿ªÆôWebЧÀÍ»á¼û
sudo firewall-cmd --zone=public --add-port=80/tcp --permanent
sudo firewall-cmd --reload

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SSHÊÇÖÎÀíÔ±Ô¶³ÌµÇ¼ЧÀÍÆ÷µÄ³£Ó÷½·¨¡£ÎªÁËÔöÌíSSH»á¼ûµÄÇå¾²ÐÔ£¬¿ÉÒÔ¾ÙÐÐÒÔÏÂÉèÖãº

ÐÞ¸ÄSSHĬÈ϶˿ڣº½«Ä¬ÈϵÄ22¶Ë¿Ú¸ÄΪһ¸öºÜÊÇÓö˿Ú£¬¿ÉÒÔïÔÌ­±©Á¦ÆƽâµÄΣº¦¡£

½ûÓÃrootÓû§µÇ¼£ºÕ¥È¡rootÓû§Ö±½ÓʹÓÃSSHµÇ¼ЧÀÍÆ÷£¬¿ÉÒÔÔöÌí¹¥»÷ÕßµÄÈëÇÖÄѶÈ¡£

ÉèÖù«Ô¿µÇ¼£ºÊ¹ÓÃÃÜÔ¿¶ÔµÇ¼ЧÀÍÆ÷£¬¶ø²»ÊÇÃÜÂëµÇ¼£¬¿ÉÒÔÌṩ¸ü¸ßµÄÇå¾²ÐÔ¡£

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sudo vi /etc/ssh/sshd_config

# ÐÞ¸ÄSSHĬÈ϶˿Ú
Port 2222

# ½ûÓÃrootÓû§µÇ¼
PermitRootLogin no

# ÉèÖù«Ô¿µÇ¼
RSAAuthentication yes
PubkeyAuthentication yes

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sudo systemctl restart sshd

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ΪÁ˱ÜÃⱩÁ¦ÆƽâSSHÃÜÂ룬¿ÉÒÔÌí¼ÓÏÞÖÆ»úÖÆ£¬ÏÞÖÆSSHʧ°ÜµÇ¼µÄ´ÎÊýºÍʱ¼ä¾àÀë¡£ÒÔÏÂÊÇʹÓÃfail2ban¹¤¾ßÏÞÖÆSSH±©Á¦ÆƽâµÄʾÀý´úÂ룺

# ×°ÖÃfail2ban
sudo yum install epel-release
sudo yum install fail2ban

# ½¨Éè×Ô½ç˵ÉèÖÃÎļþ
sudo cp /etc/fail2ban/jail.conf /etc/fail2ban/jail.local

# ±à¼­ÉèÖÃÎļþ
sudo vi /etc/fail2ban/jail.local

# ÐÞ¸ÄSSHÏà¹ØÉèÖÃ
[sshd]
enabled  = true
port     = ssh
logpath  = %(sshd_log)s
backend  = %(sshd_backend)s
maxretry = 3
bantime  = 3600

# Æô¶¯fail2banЧÀÍ
sudo systemctl start fail2ban
sudo systemctl enable fail2ban

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