系统安全与性能调优全攻略

1. 系统服务状态与安全风险

在系统中，众多服务的运行状态各异，如下所示：
| 服务名称 | 0 | 1 | 2 | 3 | 4 | 5 | 6 |
| — | — | — | — | — | — | — | — |
| ypserv | off | off | off | off | off | off | off |
| autofs | off | off | off | off | off | off | off |
| dhcpd | off | off | off | off | off | off | off |
| mysqld | off | off | off | on | on | on | off |
| nscd | off | off | off | off | off | off | off |
| ntpd | off | off | off | off | off | off | off |
| squid | off | off | off | off | off | off | off |
| vmware | off | off | off | on | off | off | off |
| apcupsd | off | off | off | on | off | off | off |
| mysqld−skip | off | off | off | off | off | off | off |
| postgresql | off | off | off | off | off | off | off |