系统安全与性能调优全解析
1. 系统服务状态与安全风险
系统中存在众多服务，其运行状态各异，部分服务存在潜在安全风险。以下是一些常见服务的运行状态：
| 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
