新书第一章sysctl.conf

 mv /etc/sysctl.conf /etc/sysctl.conf.bak

cat >>/etc/sysctl.conf<<EOF
net.ipv4.ip_forward = 1
net.ipv4.conf.default.rp_filter = 1
net.ipv4.conf.default.accept_source_route = 0
kernel.sysrq = 0
kernel.core_uses_pid = 1
kernel.msgmnb = 65536
kernel.msgmax = 65536
kernel.shmmax = 68719476736
kernel.shmall = 4294967296
kernel.panic = 60
net.ipv4.tcp_syncookies = 1
net.ipv4.icmp_echo_ignore_broadcasts = 1
net.ipv4.icmp_ignore_bogus_error_responses = 1
net.ipv4.conf.all.accept_redirects = 0
net.ipv4.conf.all.rp_filter = 1
net.ipv4.conf.all.log_martians = 1
net.ipv4.conf.all.arp_announce = 2
net.ipv4.conf.all.arp_ignore = 1
fs.file-max = 655350
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_mem = 94500000 915000000 927000000
net.ipv4.tcp_max_orphans = 3276800
net.ipv4.tcp_fin_timeout = 3
net.ipv4.tcp_keepalive_time = 10
net.ipv4.ip_local_port_range = 1024  65535
net.ipv4.ip_conntrack_max = 1310720000
net.ipv4.netfilter.ip_conntrack_tcp_timeout_time_wait = 10

net.ipv4.netfilter.ip_conntrack_tcp_timeout_established = 30

net.ipv4.netfilter.ip_conntrack_tcp_timeout_close_wait = 6

net.ipv4.netfilter.ip_conntrack_tcp_timeout_fin_wait = 12

vm.swappiness = 2
net.ipv4.tcp_tw_reuse = 1
net.ipv4.conf.default.rp_filter = 0
net.ipv4.tcp_max_tw_buckets = 100
net.ipv4.conf.all.rp_filter = 0
net.ipv4.conf.all.send_redirects = 1
net.ipv4.ip_nonlocal_bind = 1
net.ipv4.tcp_keepalive_intvl = 3
net.ipv4.tcp_keepalive_probes = 3
net.ipv4.tcp_orphan_retries = 1

EOF
sysctl  -p