优化配置

输入vi /etc/security/limits.conf回车

光标移到在文件结尾，按【a】进入编辑模式，添加以下内容，并保存退出。

* hard nofile 51200
* soft nofile 51200

输入vi /etc/profile回车

光标移到在文件结尾，按【a】进入编辑模式，添加以下内容，并保存退出。

ulimit -n 51200

输入vi /etc/sysctl.d/local.conf回车

按【a】进入编辑模式输入以下内容，并保存退出。

# max open files
fs.file-max = 51200
# max read buffer
net.core.rmem_max = 67108864
# max write buffer
net.core.wmem_max = 67108864
# default read buffer
net.core.rmem_default = 65536
# default write buffer
net.core.wmem_default = 65536
# max processor input queue
net.core.netdev_max_backlog = 4096
# max backlog
net.core.somaxconn = 4096

# resist SYN flood attacks
net.ipv4.tcp_syncookies = 1
# reuse timewait sockets when safe
net.ipv4.tcp_tw_reuse = 1
# turn off fast timewait sockets recycling
net.ipv4.tcp_tw_recycle = 0
# short FIN timeout
net.ipv4.tcp_fin_timeout = 30
# short keepalive time
net.ipv4.tcp_keepalive_time = 1200
# outbound port range
net.ipv4.ip_local_port_range = 10000 65000
# max SYN backlog
net.ipv4.tcp_max_syn_backlog = 4096
# max timewait sockets held by system simultaneously
net.ipv4.tcp_max_tw_buckets = 5000
# turn on TCP Fast Open on both client and server side
net.ipv4.tcp_fastopen = 3
# TCP receive buffer
net.ipv4.tcp_rmem = 4096 87380 67108864
# TCP write buffer
net.ipv4.tcp_wmem = 4096 65536 67108864
# turn on path MTU discovery
net.ipv4.tcp_mtu_probing = 1

# for high-latency network
# net.ipv4.tcp_congestion_control = hybla

# for low-latency network, use cubic instead
# net.ipv4.tcp_congestion_control = cubic

重新载入修改过的系统配置。

在root@ssvps:~#提示符后输入sysctl --system

重启系统配置。在root@ssvps:~#提示符后输入reboot

此时，PuTTY会弹出窗口提示断开连接，点确定并关闭窗口。