业务量太大的时候,lnmp下的php-fpm就卡死了。查了半天,发现有个pcscd.comm占用了好几千个连接数,极其壮观:
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查linux官方文档,解释这个服务:
pcscd is the daemon program for pcsc-lite and the MuscleCard framework. It is a resource manager that coordinates communications with smart card readers and smart cards and cryptographic tokens that are connected to the system.pcscd is normally started at boot time from /etc/init.d/pcscd. It allows applications to access smart cards and readers without knowing details of the card or reader.
原来是智能卡的支持服务,果断关掉:
[admin@APP5 ~]$ sudo service pcscd stop
Stopping PC/SC smart card daemon (pcscd): [ OK ]
查看连接数,瞬间降下来了。
然后chkconfig 把pcscd服务自启动给禁用掉:
chkconfig pcscd off
搞定。
至于为什么启动了这么多连接数,具体原因未明,估计是linux虚拟机系统没配置好。

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