apache服务异常启动失败

apache 服务启动失败，信号量未释放

1. apache故障现象

因为之前一直用reload热部署apache，可能有些mutex信号量没有释放，造成无法申请。有时会导致apache 启动/加载失败，并且报一些如下的错误 -->

[Mon Jul 04 14:13:59.260922 2016] [core:emerg] [pid 27103] (28)No space left on device: AH00023: Couldn\'t create the rewrite-map mutex
[Mon Jul 04 14:13:59.260946 2016] [:emerg] [pid 27103] AH00020: Configuration Failed, exiting

2. 解决办法

则执行下面语句，释放同步信号量

ipcs | grep apache | awk  \'{print $2}\'  >  signal.txt
for  i  in  `cat  signal.txt` ;  do  { ipcrm -s $i; } ;  done;

3. 再次重启apache即可解决