优化系统socket参数级文件描述符

#!/bin/bash

# set ulimit
limit()
{
echo “ulimit -SHn 102400” >>/etc/rc.local
cat >> /etc/security/limits.conf << EOF

• soft nofile 65535
• hard nofile 65535
  EOF
  }

# set sysctl
sysctl()
{
cp /etc/sysctl.conf /etc/sysctl.conf-$(date +%F).bak
true > /etc/sysctl.conf
cat >> /etc/sysctl.conf << EOF
kernel.core_uses_pid = 1
kernel.msgmax = 65536
kernel.msgmnb = 65536
kernel.shmall = 4294967296
kernel.shmmax = 68719476736
kernel.sysrq = 0
net.core.netdev_max_backlog = 262144
net.core.rmem_default = 8388608
net.core.rmem_max = 16777216
net.core.somaxconn = 2048
net.core.wmem_default = 8388608
net.core.wmem_max = 16777216
net.ipv4.conf.all.arp_announce = 2
net.ipv4.conf.all.rp_filter = 0
net.ipv4.conf.default.accept_source_route = 0
net.ipv4.conf.default.arp_announce = 2
net.ipv4.conf.default.rp_filter = 0
net.ipv4.conf.lo.arp_announce = 2
net.ipv4.icmp_echo_ignore_all = 0 #禁ping，如果有nagios监控，这步可省去
net.ipv4.ip_forward = 0
net.ipv4.ip_local_port_range = 1024 65535
net.ipv4.neigh.default.gc_stale_time = 120
net.ipv4.tcp_fin_timeout = 1
net.ipv4.tcp_keepalive_time = 1200
net.ipv4.tcp_max_orphans = 262144
net.ipv4.tcp_max_syn_backlog = 1024
net.ipv4.tcp_max_tw_buckets = 5000
net.ipv4.tcp_mem = 94500000 915000000 927000000
net.ipv4.tcp_rmem = 4096 87380 4194304
net.ipv4.tcp_sack = 1
net.ipv4.tcp_synack_retries = 1
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_syn_retries = 1
net.ipv4.tcp_timestamps = 0
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_window_scaling = 1
net.ipv4.tcp_wmem = 4096 16384 4194304
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1
vm.swappiness = 0

#禁用time_wait
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_fin_timeout = 30
EOF
/sbin/sysctl -p
echo “sysctl set OK!!”
}

#—————————————————————————–
limit
sysctl