centos7 begin========================================================
没有ifconfig 	-> yum install net-tools
重启ssd服务		-> systemctl restart sshd.service
关闭selinux		-> vi /etc/sysconfig/selinux添加SELINUX=disabled
关闭防火墙		-> systemctl stop firewalld
				   systemctl disable firewalld.service
TCP连接数		-> vi /etc/security/limits.conf添加俩行
								* soft nofile                   1024000
								* hard nofile                   1024000
				-> vi /etc/pam.d/login添加一行
								session required /lib/security/pam_limits.so
				-> vi /etc/sysctl.conf添加一行
								net.ipv4.ip_local_port_range = 1024 65000
centos7 end==========================================================

ulimit -b unlimited
ulimit -c unlimited
ulimit -d unlimited
ulimit -e unlimited
ulimit -f unlimited
ulimit -i unlimited
ulimit -l unlimited
ulimit -m unlimited
ulimit -n unlimited
ulimit -p unlimited
ulimit -q unlimited
ulimit -r unlimited
ulimit -s unlimited
ulimit -t unlimited
ulimit -u unlimited
ulimit -v unlimited
ulimit -x unlimited

* soft core                     unlimited
* soft data                     unlimited
* soft fsize                    unlimited
* soft memlock                  unlimited
* soft nofile                   unlimited
* soft rss                      unlimited
* soft stack                    unlimited
* soft cpu                      unlimited
* soft nproc                    unlimited
* soft as                       unlimited
* soft maxlogins                unlimited
* soft maxsyslogins             unlimited
* soft priority                 unlimited
* soft locks                    unlimited
* soft sigpending               unlimited
* soft msgqueue                 unlimited
* soft nice                     unlimited
* soft rtprio                   unlimited

* hard core                     unlimited
* hard data                     unlimited
* hard fsize                    unlimited
* hard memlock                  unlimited
* hard nofile                   1024000
* hard rss                      unlimited
* hard stack                    unlimited
* hard cpu                      unlimited
* hard nproc                    unlimited
* hard as                       unlimited
* hard maxlogins                unlimited
* hard maxsyslogins             unlimited
* hard priority                 unlimited
* hard locks                    unlimited
* hard sigpending               unlimited
* hard msgqueue                 unlimited
* hard nice                     unlimited
* hard rtprio                   unlimited


net.ipv4.tcp_fin_timeout = 30
net.ipv4.tcp_keepalive_time = 1200
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_tw_recycle = 1
net.ipv4.ip_local_port_range = 1024 65000
net.ipv4.tcp_max_syn_backlog = 8192
net.ipv4.tcp_max_tw_buckets = 5000