1、limit
cat /etc/security/limits.conf
* soft nofile 65536
* hard nofile 65536
* soft nproc 131072
* hard nproc 131072
* soft memlock -1
* hard memlock -1
2、内核参数
cat /etc/sysctl.conf
#尽量不使用swap
vm.swappiness=1
#绝对不超量使用内存
vm.overcommit_memory=2
#此参数*实际内存*100%+swap 小于 实际内存
vm.overcommit_ratio=85
#文件系统的缓存中保存的脏页数超过总内存的这个百分比时，开始后台刷脏数据
vm.dirty_background_ratio=1
#前台刷脏页的百分比
vm.dirty_ratio=2
kernel.sem=20 13000 20 650
kernel.sysrq = 1
kernel.core_uses_pid = 1
kernel.msgmnb = 65536
kernel.msgmax = 65536
kernel.msgmni = 2048
net.ipv4.tcp_syncookies = 1
net.ipv4.ip_forward = 0
net.ipv4.conf.default.accept_source_route = 0
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_max_syn_backlog = 8192
net.ipv4.conf.all.arp_filter = 1
net.ipv4.ip_local_port_range = 1024 65535
net.core.netdev_max_backlog = 8192
net.core.rmem_max = 2097152
net.core.wmem_max = 2097152
net.core.somaxconn = 8192
