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Linux 系统安全与性能优化全解析

1. 服务状态与安全风险

在 Linux 系统中，众多服务的运行状态各异，可能存在潜在的安全漏洞。以下是部分服务的当前状态：
| 服务 | 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