UBUNTU 下 APACHE2 Too many open files: Error retrieving pid file /var/run/apache2.pid

cat/proc/sys/fs/file-max系统可打开的最大文件个数

ulimit-n当前系统限制的个数

ulimit-n10240调整当前系统的限制

修改/etc/sysctl.conf,加入

net.ipv4.ip_local_port_range=102465000
net.core.wmem_default=8388608
net.core.rmem_default=8388608
net.core.rmem_max=16777216
net.core.wmem_max=16777216
net.ipv4.tcp_rmem=40968738016777216
net.ipv4.tcp_wmem=40966553616777216
net.ipv4.tcp_fin_timeout=30
net.ipv4.tcp_tw_reuse=1
net.ipv4.tcp_tw_recycle=1
net.ipv4.tcp_timestamps=0
net.ipv4.tcp_window_scaling=1
net.ipv4.tcp_sack=1
net.core.netdev_max_backlog=262144
net.ipv4.tcp_syncookies=1
net.ipv4.tcp_max_orphans=3276800
net.ipv4.tcp_max_syn_backlog=262144
net.ipv4.tcp_synack_retries=1
net.ipv4.tcp_syn_retries=1
net.ipv4.tcp_keepalive_time=30
net.ipv4.tcp_max_tw_buckets=6000
net.core.somaxconn=65535
fs.file-max=1024000

vim/etc/security/limits.conf进行设置
修改/etc/security/limits.conf，在最下方添加
*softnofile65536
*hardnofile65536
重启

sysctl-p无需重启立刻使生效

apache支持监听8180个端口默认的。不知道增加还得肿么搞。

netstat-n|awk'/^tcp/{++S[$NF]}END{for(ainS)printa,S[a]}'

netstat-antup|wc-l
netstat-antup|grep'TIME_WAIT'|wc-l
netstat-antup|grep'SYN_RECV'|wc-l