sysctrl.conf
fs.file-max = 6553600
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
#高并发，快速访问
net.ipv4.netfilter.ip_conntrack_max = 6553600
net.ipv4.tcp_window_scaling = 1
net.ipv4.tcp_timestamps = 0
net.ipv4.tcp_max_orphans = 524288
net.core.somaxconn = 20480
net.ipv4.tcp_max_tw_buckets = 15000
net.ipv4.ip_local_port_range = 1024 65000
net.ipv4.tcp_rmem = 4096 87380 16777216
net.ipv4.tcp_wmem = 4096 65536 16777216
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216
net.core.netdev_max_backlog = 80960
net.ipv4.tcp_max_syn_backlog = 819200
net.ipv4.tcp_syn_retries = 2
net.ipv4.tcp_synack_retries = 2
net.ipv4.tcp_fin_timeout = 5
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_retries1 = 3
net.ipv4.tcp_retries2 = 3
net.ipv4.tcp_orphan_retries = 3
net.ipv4.tcp_keepalive_intvl = 5
net.ipv4.tcp_keepalive_probes = 5
net.ipv4.tcp_keepalive_time = 180