centos下limits.conf和sysctl.conf优化脚本

# turning system     

ulimit -HSn 65536

echo -ne "     

* soft nofile 65536

* hard nofile 65536

" >>/etc/security/limits.conf     

           

           

# /etc/sysctl.conf     

cat >>/etc/sysctl.conf<<EOF     

net.ipv4.netfilter.ip_conntrack_max = 131072

net.ipv4.tcp_max_tw_buckets = 5000

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.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_tw_recycle = 1

#net.ipv4.tcp_fin_timeout = 30

           

#net.ipv4.tcp_keepalive_time = 300

net.ipv4.ip_local_port_range = 1024    65000

EOF