AH00708: Cannot open data file

Dave Wreski <dwreski@xxxxxxxxxxxxxxxxxxx> · Sun, 10 Feb 2019 10:55:27 -0500

Hi,

I have a fedora28 system with httpd-2.4.34-3.fc28.x86_64 and having a 

problem with caching. I believe this started happening after we recently 

changed the hostname from "webstage" to "www".

[Sun Feb 10 10:42:26.731666 2019] [cache_disk:error] [pid 997:tid 

140189099861760] (2)No such file or directory: [client 

185.25.35.14:48969] AH00708: Cannot open data file 

/var/cache/httpd/HR/xp/ObxK7mTztMNioVCrxg.header.vary/KO/JY/F05RKKeFm7Jp4p2F5A.data

The .header file is there, and appears to contain info about robots.txt:

�)�*e����F��n$e���*e���$�C,������������������������https://linuxsecurity.com:443/robots.txt?Last-Modified: 

Mon, 04 Feb 2019 13:48:24 GMT

Content-Length: 882
ETag: "372-58111bf200a71"
Accept-Ranges: bytes
Cache-Control: max-age=300
Expires: Sun, 10 Feb 2019 14:36:31 GMT
Vary: User-Agent
Strict-Transport-Security: max-age=15768000
Content-Type: text/plain; charset=UTF-8

Accept: text/plain; charset=UTF-8
User-Agent: Jersey/2.6 (HttpUrlConnection 1.8.0_152)
Host: linuxsecurity.com
If-None-Match: "372-58111bf200a71"
If-Modified-Since: Mon, 04 Feb 2019 13:48:24 GMT

I've removed the entirety of /var/cache/httpd/ and it is still 

happening. I don't know how to reproduce it or what specifically caused it.

Below is the caching configuration from my virtual host:

CacheQuickHandler off
CacheLock on
CacheLockPath /tmp/mod_cache-lock
CacheLockMaxAge 5
CacheIgnoreHeaders Set-Cookie
CacheRoot "/var/cache/httpd"

<Location />
    CacheEnable disk
    CacheHeader on
    CacheDefaultExpire 800
    CacheMaxExpire 64000
    CacheIgnoreNoLastMod On
    ExpiresActive on
    ExpiresDefault A300
</Location>

Any ideas for how to debug this further would be greatly appreciated.

Thanks,
Dave

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