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yum update

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·À»ðǽÊDZ£»¤ÏµÍ³ÃâÊÜÍøÂç¹¥»÷µÄÒªº¦×é¼þ¡£CentOSϵͳʹÓÃfirewalld×÷ΪĬÈÏ·À»ðǽÖÎÀíÆ÷¡£ÒÔÏÂÊÇÔõÑù×°Öò¢ÉèÖÃfirewalldµÄʾÀý´úÂ룺

# ×°ÖÃfirewalld
yum install firewalld

# ÆôÓÃfirewalld
systemctl start firewalld

# ÉèÖÃfirewalld¿ª»úÆô¶¯
systemctl enable firewalld

# ¿ªÆô³£ÓõÄÍøÂçЧÀÍ
firewall-cmd --permanent --add-service=http
firewall-cmd --permanent --add-service=https

# ÖØÆô·À»ðǽ
firewall-cmd --reload

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ÔÚCentOSϵͳÉÏ£¬ÓÐһЩ²»ÐëÒªµÄЧÀÍ¿ÉÄÜ»á³ÉΪ¶ñÒâ´úÂë¹¥»÷µÄÄ¿µÄ¡ £¿ÉÒÔͨ¹ý½ûÓûò×èÖ¹ÕâЩЧÀÍÀ´ïÔ̭ϵͳµÄ¹¥»÷Ãæ¡£ÒÔÏÂÊǽûÓúÍ×èֹЧÀ͵ÄʾÀý´úÂ룺

# ½ûÓúÍ×èÖ¹TelnetЧÀÍ
systemctl disable telnet
systemctl stop telnet

# ½ûÓúÍ×èÖ¹FTPЧÀÍ
systemctl disable vsftpd
systemctl stop vsftpd

# ½ûÓúÍ×èÖ¹ÎÞÏßЧÀÍ
systemctl disable NetworkManager
systemctl stop NetworkManager

# ½ûÓúÍ×èÖ¹²»ÐëÒªµÄÊý¾Ý¿âЧÀÍ£¨ÀýÈçMySQL£©
systemctl disable mysqld
systemctl stop mysqld

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»á¼û¿ØÖÆÊÇÏÞÖÆϵͳ»á¼ûµÄÒ»ÖÖÒªÁì¡ £¿ÉÒÔʹÓÃÒÔÏÂÉèÖÃÎļþÐ޸Ļá¼û¿ØÖÆ£º

# ÐÞ¸Ä/etc/hosts.allowÎļþÒÔÔÊÐíÌض¨µÄÖ÷ʱ»ú¼û
echo "sshd: 192.168.1.0/255.255.255.0" >> /etc/hosts.allow

# ÐÞ¸Ä/etc/hosts.denyÎļþÒÔ×èÖ¹Ìض¨µÄÖ÷ʱ»ú¼û
echo "sshd: ALL" >> /etc/hosts.deny

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Ô´¿ØÖÆÊDZ£»¤ÏµÍ³ÃâÊܶñÒâÈí¼þºÍ¶ñÒâ´úÂë¹¥»÷µÄÒ»ÖÖÒªÁì¡ £¿ÉÒÔʹÓÃÒÔÏÂÏÂÁî×°ÖúÍÉèÖÃyum-cron£¬ÒÔ×Ô¶¯¼ì²éºÍ¸üÐÂÈí¼þ°ü£º

# ×°ÖÃyum-cron
yum install yum-cron

# ÆôÓÃyum-cron
systemctl start yum-cron

# ÉèÖÃyum-cron¿ª»úÆô¶¯
systemctl enable yum-cron

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