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1.1. Ìá¸ßTCPÅþÁ¬µÄ×î´óÊýÄ¿
ͨ¹ýÐÞ¸Ä/sys/…/net/ipv4/tcp_max_syn_backlogºÍ/sys/…/net/core/somaxconn²ÎÊý£¬¿ÉÒÔÌá¸ßTCPÅþÁ¬µÄ×î´óÊýÄ¿¡£
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# ÐÞ¸Ä/sys/.../net/ipv4/tcp_max_syn_backlog²ÎÊý echo "1000000" > /sys/.../net/ipv4/tcp_max_syn_backlog # ÐÞ¸Ä/sys/.../net/core/somaxconn²ÎÊý echo "1000000" > /sys/.../net/core/somaxconn
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1.2. Ìá¸ßTCPÅþÁ¬µÄ³¬Ê±Ê±¼ä
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# ÐÞ¸Ä/sys/.../net/ipv4/tcp_fin_timeout²ÎÊý echo "30" > /sys/.../net/ipv4/tcp_fin_timeout
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1.3. ¿ªÆôTCP¿ìËÙ·¿ª£¨TCP Fast Open£©
TCP¿ìËÙ·¿ªÊÇÒ»ÖÖÓÅ»¯ÊÖÒÕ£¬Í¨¹ýÔÚÎÕÊֽ׶η¢ËÍÊý¾Ý£¬ïÔÌÍøÂçÑÓ³Ù¡£ÔÚCentOSÖУ¬¿ÉÒÔͨ¹ýÐÞ¸Ä/sys/…/net/ipv4/tcp_fastopen²ÎÊýÀ´¿ªÆôTCP¿ìËÙ·¿ª¡£
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# ¿ªÆôTCP¿ìËÙ·¿ª echo "3" > /sys/.../net/ipv4/tcp_fastopen
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Keepalive¼°TimeoutÉèÖÃ
KeepaliveÊÇÒ»ÖÖ¼á³ÖTCPÅþÁ¬»îÔ¾µÄ»úÖÆ£¬TimeoutÊÇÖ¸ÔÚһ׼ʱ¼äÄÚÎÞÏìÓ¦ºó¹Ø±ÕÅþÁ¬¡£ÔÚCentOSÖУ¬¿ÉÒÔͨ¹ýÐÞ¸Ä/etc/…/sysctl.confÎļþÀ´ÉèÖÃKeepaliveºÍTimeout¡£
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# ÉèÖÃKeepalive echo "net.ipv4.tcp_keepalive_time = 1200" >> /etc/.../sysctl.conf echo "net.ipv4.tcp_keepalive_intvl = 10" >> /etc/.../sysctl.conf echo "net.ipv4.tcp_keepalive_probes = 6" >> /etc/.../sysctl.conf # ÉèÖÃTimeout echo "net.ipv4.tcp_syn_retries = 2" >> /etc/.../sysctl.conf echo "net.ipv4.tcp_synack_retries = 2" >> /etc/.../sysctl.conf echo "net.ipv4.tcp_retries2 = 5" >> /etc/.../sysctl.conf
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¿ªÆôSYN Cookie£¨¿ÉÑ¡£©
SYN CookieÊÇÒ»ÖÖµÖÓùSYN Flood¹¥»÷µÄÊÖÒÕ¡£ÔÚCentOSÖУ¬¿ÉÒÔͨ¹ýÐÞ¸Ä/sys/…/net/ipv4/tcp_syncookies²ÎÊýÀ´¿ªÆôSYN Cookie¡£
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# ¿ªÆôSYN Cookie echo "1" > /sys/.../net/ipv4/tcp_syncookies
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# µ÷½âÎļþÐÎò·ûÏÞÖÆ echo "www-data soft nofile 65536" >> /etc/security/.../limits.conf echo "www-data hard nofile 65536" >> /etc/security/.../limits.conf
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¿ªÆôTCPÓµÈû¿ØÖÆËã·¨£¨CUBIC£©
CUBICÊÇÒ»ÖÖTCPÓµÈû¿ØÖÆËã·¨£¬¿ÉÒÔÌá¸ßЧÀÍÆ÷µÄÍøÂçÐÔÄÜ¡£ÔÚCentOSÖУ¬¿ÉÒÔͨ¹ýÐÞ¸Ä/sys/…/net/ipv4/tcp_congestion_control²ÎÊýÀ´¿ªÆôCUBIC¡£
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# ¿ªÆôCUBIC echo "cubic" > /sys/.../net/ipv4/tcp_congestion_control
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