0, 调优之ulimit命令
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| ulimit -n # 列出最大打开文件数
ulimit -a # 列出所有资源设置信息
ulimit -HSn 65535 # 软设置最大打开文件数，重启后失效
*常见案例日志,java.net.SocketException:Too many open files*
**相关配置文件**
/etc/security/limits.conf
* soft nofile 65535
* hard nofile 65535
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1, 系统内核参数调优
常见案例日志,kernel:ip_conntrack:table full,dropping packet
在/etc/sysctl.conf加入，最后执行sysctl -p使配置生效
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| net.nf_conntrack_max = 1000000 # 防止防火墙连接追踪满
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2, 调优之swappiness参数
表示使用swap的概率,此值越大表示使用swap的概率越大
查看目前配置
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| cat /proc/sys/vm/swappiness
vm.swappiness=10 # 表示当内存使用率超过(100-10)90%时,才开始使用swap.
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4，线上web服务器配置参考,需要根据服务器的配置进行修改
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| net.ipv4.conf.lo.arp_ignore = 1
net.ipv4.conf.lo.arp_announce = 2
net.ipv4.conf.all.arp_ignore = 1
net.ipv4.conf.all.arp_announce = 2
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_fin_timeout = 10
net.ipv4.tcp_max_syn_backlog = 20000
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_syncookies = 1
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_mem = 94500000 915000000 927000000
net.ipv4.tcp_max_orphans=3276800
net.ipv4.tcp_fin_timeout = 10
net.ipv4.tcp_keepalive_time = 120
net.ipv4.ip_local_port_range = 1024 65535
net.ipv4.tcp_max_tw_buckets = 80000
net.ipv4.tcp_keepalive_time = 120
net.ipv4.tcp_keepalive_intvl = 15
net.ipv4.tcp_keepalive_probes = 5
net.ipv4.conf.lo.arp_ignore = 1
net.ipv4.conf.lo.arp_announce = 2
net.ipv4.conf.all.arp_ignore = 1
net.ipv4.conf.all.arp_announce = 2
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