把ubuntu升级到9.10之后，突然发现apache2不监听80端口了。
查看了/var/log/apache2/里面的error.log日志，发现有一条记录:
PHP Warning: [eAccelerator] This build of "eAccelerator" was compiled for PHP version 5.2.10-2ubuntu6.3. Rebuild it for your PHP version (5.2.10-2ubuntu6.4) or download precompiled binaries.\n in Unknown on line 0
PHP Fatal error: Unable to start eAccelerator module in Unknown on line 0
那就干脆升级一下eAccelerator吧。截止本文书写之日，eAccelerator最近的版本为 0.9.6-rc1
