lnmp 优化日志

net.ipv4.ip_forward = 0

net.ipv4.conf.default.rp_filter = 1

net.ipv4.conf.default.accept_source_route = 0

kernel.sysrq = 0

kernel.core_uses_pid = 1

net.ipv4.tcp_syncookies = 1

kernel.msgmnb = 65536

kernel.msgmax = 65536

kernel.shmmax = 68719476736

kernel.shmall = 4294967296

net.ipv4.tcp_max_tw_buckets = 6000

net.ipv4.tcp_sack = 1

net.ipv4.tcp_window_scaling = 1

net.ipv4.tcp_rmem = 4096 87380 4194304

net.ipv4.tcp_wmem = 4096 16384 4194304

net.core.wmem_default = 8388608

net.core.rmem_default = 8388608

net.core.rmem_max = 16777216

net.core.wmem_max = 16777216

net.core.netdev_max_backlog = 262144

net.core.somaxconn = 262144

net.ipv4.tcp_max_orphans = 3276800

net.ipv4.tcp_max_syn_backlog = 262144

net.ipv4.tcp_timestamps = 0

net.ipv4.tcp_synack_retries = 1

net.ipv4.tcp_syn_retries = 1

net.ipv4.tcp_tw_recycle = 1

net.ipv4.tcp_tw_reuse = 1

net.ipv4.tcp_mem = 94500000 915000000 927000000

net.ipv4.tcp_fin_timeout = 1

net.ipv4.tcp_keepalive_time = 30

net.ipv4.ip_local_port_range = 1024 65000

在服务器安装了LNMP(Linux+Nginx+Mysql+php)环境以后Linux服务器参数必须作必要的优化，包括网络参数优化、文件数优化、内存优化等等。 一、网络参数优化： 这部分主要参照张宴大师 《Nginx 0.8.x + PHP 5.2.13（FastCGI）搭建赛过Apache十倍的Web服务器（第6版）[原创]》其中 5、优化Linux内核参数的内容： vi /etc/sysctl.conf #编辑sysctl.conf文件 #在/etc/sysctl.conf中添加以下内容

网络参数优化开始

net.ipv4.tcp_max_syn_backlog = 65536 net.core.netdev_max_backlog = 32768 net.core.somaxconn = 32768

net.core.wmem_default = 8388608 net.core.rmem_default = 8388608 net.core.rmem_max = 16777216 net.core.wmem_max = 16777216

net.ipv4.tcp_timestamps = 0 net.ipv4.tcp_synack_retries = 2 net.ipv4.tcp_syn_retries = 2

net.ipv4.tcp_tw_recycle = 1 #net.ipv4.tcp_tw_len = 1 net.ipv4.tcp_tw_reuse = 1

net.ipv4.tcp_mem = 94500000 915000000 927000000 net.ipv4.tcp_max_orphans = 3276800

#net.ipv4.tcp_fin_timeout = 30 #net.ipv4.tcp_keepalive_time = 120 net.ipv4.ip_local_port_range = 1024 65535 #网络参数优化结束 #添加内容结束

修改完成后运行如下命令使参数生效： /sbin/sysctl -p

二、系统最大打开文件数优化 默认状况下，系统容许最大打开文件数为1024个，这对于访问量较大的web服务器来讲远远不够用。系统最大打开文件数能够经过ulimit来修改和查询。 通常状况下，能够经过ulimit -n来查看目前系统容许的最大打开文件数，例如 ： ulimit -n 1024 #系统返回

若是咱们要修改系统容许最大文件打开数，能够经过ulimit -SHn来作，例如要临时修改系统最大打开文件数为51201个，那么用以下命令： ulimit -SHn 51201 每次重启系统时，该值会被自动还原，能够将上述命令写入 /etc/rc.local 中。若是想永久更改，能够按照以下修改： vi /etc/security/limits.conf

add

• soft nofile 51201
• hard nofile 51201

系统最大打开文件数影响到的配置文件(如下必须设置为系统设置相一致，例如设置系统最大打开文件数为：51201)： A、Nginx配置文件nginx.conf的配置项：worker_rlimit_nofile、worker_connections、open_file_cache等，例如设置为： worker_rlimit_nofile 51201; events { use epoll; worker_connections 51201; } http { #其它参数略过 open_file_cache max=51201 inactive=20s;
open_file_cache_min_uses 1;
open_file_cache_valid 30s; #其它参数略过 } B、FastCGI配置文件php-fpm.conf的配置项 51201 三、系统共享内存优化： 系统共享内存大小主要影响到eaccelerator的设置： eaccelerator.shm_size="32" 该项为eaccelerator可以使用的共享内存大小(单位为MB)设置。 在Linux下，单个进程的最大共享内存使用量受/proc/sys/kernel/shmmax中设置的数字限制(单位为字节)，例如Redhat 4.7的shmmax默认值为33554432字节(33554432bytes/1024/1024=32MB)。 临时更改该值(例如修改成128MB=128x1024x1024=134217728字节)： echo 134217728 > /proc/sys/kernel/shmmax echo 134217728 > /proc/sys/kernel/shmall 按照以上方法更改，在每次重启系统时，该值会被自动还原。若是想永久更改，能够修改/etc/sysctl.conf文件，设置： #系统共享内存大小优化 kernel.shmmax = 134217728 完整的/etc/sysctl.conf修改添加内容以下： #在/etc/sysctl.conf中添加以下内容

网络参数优化开始

net.ipv4.tcp_max_syn_backlog = 65536 net.core.netdev_max_backlog = 32768 net.core.somaxconn = 32768

net.core.wmem_default = 8388608 net.core.rmem_default = 8388608 net.core.rmem_max = 16777216 net.core.wmem_max = 16777216

net.ipv4.tcp_timestamps = 0 net.ipv4.tcp_synack_retries = 2 net.ipv4.tcp_syn_retries = 2

net.ipv4.tcp_tw_recycle = 1 #net.ipv4.tcp_tw_len = 1 net.ipv4.tcp_tw_reuse = 1

net.ipv4.tcp_mem = 94500000 915000000 927000000 net.ipv4.tcp_max_orphans = 3276800

#net.ipv4.tcp_fin_timeout = 30 #net.ipv4.tcp_keepalive_time = 120 net.ipv4.ip_local_port_range = 1024 65535 #网络参数优化结束 #系统共享内存大小优化开始 kernel.shmmax = 134217728 #系统共享内存大小优化结束 #添加内容结束 修改完成后运行如下命令使参数生效 /sbin/sysctl -p 以上，若有不足，欢迎你们指正和追加，谢谢！

高负载linux服务器的内核调优 vi /etc/sysctl.conf,修改内核参数： kernel.shmall = 268435456 net.ipv4.tcp_syncookies = 1 net.ipv4.tcp_tw_reuse = 1 net.ipv4.tcp_tw_recycle = 1 net.ipv4.tcp_fin_timeout = 30 net.ipv4.tcp_keepalive_time = 1200 net.ipv4.ip_local_port_range = 1024 65000 net.ipv4.tcp_max_tw_buckets = 5000 net.ipv4.tcp_max_tw_buckets = 5000 net.ipv4.tcp_fin_timeout = 30 net.ipv4.tcp_keepalive_time = 300 net.ipv4.tcp_syncookies = 1 net.ipv4.tcp_tw_reuse = 1 net.ipv4.tcp_tw_recycle = 1 net.ipv4.ip_local_port_range = 5000 65000 net.ipv4.tcp_mem = 786432 1048576 1572864 net.core.wmem_max = 873200 net.core.rmem_max = 873200 net.ipv4.tcp_wmem = 8192 436600 873200 net.ipv4.tcp_rmem = 32768 436600 873200 net.core.somaxconn = 256 net.core.netdev_max_backlog = 1000 net.ipv4.tcp_max_syn_backlog = 2048 net.ipv4.tcp_retries2 = 5 net.ipv4.tcp_keepalive_time = 500 net.ipv4.tcp_keepalive_intvl = 30 net.ipv4.tcp_keepalive_probes = 3 net.ipv4.conf.lo.arp_ignore = 0 net.ipv4.conf.lo.arp_announce = 0 net.ipv4.conf.all.arp_ignore = 0 net.ipv4.conf.all.arp_announce = 0 几个解释： net.ipv4.tcp_syncookies = 1 #表示开启SYN Cookies。当出现SYN等待队列溢出时，启用cookies来处理，可防范少许SYN攻击，默认为0，表示关闭； net.ipv4.tcp_tw_reuse = 1 #表示开启重用。容许将TIME-WAIT sockets从新用于新的TCP链接，默认为0，表示关闭； net.ipv4.tcp_tw_recycle = 1 #表示开启TCP链接中TIME-WAIT sockets的快速回收，默认为0，表示关闭。 net.ipv4.tcp_fin_timeout = 30 #表示若是套接字由本端要求关闭，这个参数决定了它保持在FIN-WAIT-2状态的时间。 net.ipv4.tcp_keepalive_time = 1200 #表示当keepalive起用的时候，TCP发送keepalive消息的频度。缺省是2小时，改成20分钟。 net.ipv4.ip_local_port_range = 1024 65000 #表示用于向外链接的端口范围。缺省状况下很小：32768到61000，改成1024到65000。 net.ipv4.tcp_max_tw_buckets = 5000 #表示系统同时保持TIME_WAIT套接字的最大数量，若是超过这个数字， #TIME_WAIT套接字将马上被清除并打印警告信息。默认为180000，改成5000。 #对于Apache、Nginx等服务器，上几行的参数能够很好地减小TIME_WAIT套接字数量， #可是对于Squid，效果却不大。此项参数能够控制TIME_WAIT套接字的最大数量，避免Squid服务器被大量的TIME_WAIT套接字拖死

完整的内核优化配置： net.ipv4.tcp_max_tw_buckets = 6000 net.ipv4.tcp_sack = 1 net.ipv4.tcp_window_scaling = 1 net.ipv4.tcp_rmem = 4096 87380 4194304 net.ipv4.tcp_wmem = 4096 16384 4194304 net.core.wmem_default = 8388608 net.core.rmem_default = 8388608 net.core.rmem_max = 16777216 net.core.wmem_max = 16777216 net.core.netdev_max_backlog = 262144 net.core.somaxconn = 262144 net.ipv4.tcp_max_orphans = 3276800 net.ipv4.tcp_max_syn_backlog = 262144 net.ipv4.tcp_timestamps = 0 net.ipv4.tcp_synack_retries = 1 net.ipv4.tcp_syn_retries = 1 net.ipv4.tcp_tw_recycle = 1 net.ipv4.tcp_tw_reuse = 1 net.ipv4.tcp_mem = 94500000 915000000 927000000 net.ipv4.tcp_fin_timeout = 1 net.ipv4.tcp_keepalive_time = 30 net.ipv4.ip_local_port_range = 1024 65000

~]# sysctl -p net.ipv4.ip_forward = 0 net.ipv4.conf.default.rp_filter = 1 net.ipv4.conf.default.accept_source_route = 0 kernel.sysrq = 0 kernel.core_uses_pid = 1 net.ipv4.tcp_syncookies = 1 kernel.msgmnb = 65536 kernel.msgmax = 65536 kernel.shmmax = 4294967295 kernel.shmall = 268435456 kernel.sem = 250 32000 100 128 fs.file-max = 65535 net.ipv4.ip_local_port_range = 1024 65535 net.core.wmem_max = 262144 net.core.wmem_default = 262144 net.core.rmem_default = 262144 net.core.rmem_max = 262144

修改/etc/sysctl.conf， /sbin/sysctl -p当即生效 永久修改内核参数： echo “10″ > /proc/sys/net/ipv4/tcp_fin_timeout 各类参数的意思：http://ipsysctl-tutorial.frozentux.net/ipsysctl-tutorial.html 还参考了：http://trac.lighttpd.net/trac/wiki/Docs%3APerformance#platform-specific-notes net.ipv4.tcp_fin_timeout = 10 net.ipv4.tcp_keepalive_time = 300 net.ipv4.tcp_syncookies = 1 net.ipv4.tcp_tw_reuse = 1 net.ipv4.tcp_tw_recycle = 1 #tcp port range net.ipv4.ip_local_port_range = 4096 65000 #tcp send buffer. min, default , and max net.ipv4.tcp_wmem = 4096 65536 16777216 #tcp reservie buffer. #net.ipv4.tcp_rmem = 4096 65536 16777216