> ## Content Index
> Fetch the complete content index at: https://note.xdq.me/llms.txt
> Use this file to discover other available public pages before exploring further.

# Centos 开启 dns缓存
- URL: https://note.xdq.me/centos-kai-qi-dnshuan-cun/
- Published: 2020-11-04T05:13:14.000Z
- Updated: 2026-10-03T02:54:29.000Z
- Author: xud6
- Tags: centos, centos7, #Import 2026-10-03 02:45

安装nscd

```
yum install nscd

```

在有IPA Client(或SSSD)的情况下修改`/etc/nscd.conf`中enable-cache为如下

```
enable-cache hosts yes
enable-cache passwd no
enable-cache group no
enable-cache netgroup no
enable-cache services no

```

启动

```
systemctl enable nscd
systemctl restart nscd

```

验证已经开启

```
time getent hosts www.bing.com

```

结果中

```
real    0m0.002s
user    0m0.001s
sys     0m0.000s

```

real 几乎等于 user + sys