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https://issues.apache.org/jira/browse/TS-2399?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13863277#comment-13863277
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James Peach commented on TS-2399:
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This bug is a bit confusing. Normally, when we speak of permissions being
bypassed, we mean that access is allowed where it ought to be denied. In this
case, it is really not clear to me what is going on.
- I don't see the script you refer to in the wiki
- I don't know what user you are running {{traffic_server}} as
- I don't know how you are running the startup script.
> Disk cache raw device permissions being bypassed
> ------------------------------------------------
>
> Key: TS-2399
> URL: https://issues.apache.org/jira/browse/TS-2399
> Project: Traffic Server
> Issue Type: Bug
> Components: Cache, Core
> Reporter: David Carlin
> Assignee: Leif Hedstrom
> Fix For: 4.2.0
>
>
> Disk cache raw device permissions:
> {noformat}brw-rw---- 1 root disk 253, 4 Nov 26 16:03 /dev/dm-4
> {noformat}
> If I run 'traffic_server' by itself, I can't use the cache - I get permission
> errors opening it up:
> {noformat}
> [Nov 26 16:56:42.976] Server {0x2b4e29878540} WARNING: unable to open
> '/dev/dm-4': -13, Permission denied
> [Nov 26 16:56:42.976] Server {0x2b4e29878540} WARNING: could not initialize
> storage "/dev/dm-4" [unable to open]
> [Nov 26 16:56:42.976] Server {0x2b4e29878540} NOTE: cache clustering disabled
> {noformat}
> However, I can I start ATS fine and use the raw device disk cache via the
> trafficserver startup script.
> These docs indicate that I should be setting the owner to the user that ATS
> runs as, but I don't need to as long as I start via the script:
> https://cwiki.apache.org/confluence/display/TS/FAQ#FAQ-rawdisk
> Once I change ownership of /dev/dm-4 to user ATS is run as, then I can launch
> traffic_server by itself.
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