Bug #1845: Inventory sometimes doesn't find a machine's UUID: "/dev/mem: mmap: Bad address" - Rudder - Issue Tracker

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Bug #1845

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Inventory sometimes doesn't find a machine's UUID: "/dev/mem: mmap: Bad address"

Added by Jonathan CLARKE about 13 years ago. Updated over 12 years ago.

Status:

Released

Priority:

Assignee:

Nicolas CHARLES

Category:

System techniques

Target version:

2.4.0~beta5

Pull Request:

Severity:

UX impact:

User visibility:

Effort required:

Priority:

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Fix check:

Regression:

Description

Sometimes, for example on EC2, we are not able to find that machine UUID, and so the report contains things like:

<MACHINEID>/dev/mem: mmap: Bad address</MACHINEID>

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Updated by Jonathan CLARKE about 13 years ago

Subject changed from FusionInventory sometimes doesn't find a machine's UUID: "/dev/mem: mmap: Bad address" to Inventory sometimes doesn't find a machine's UUID: "/dev/mem: mmap: Bad address"

OK, actually the MACHINEID is not set by Fusion, but by our own promises. To get it we run "/usr/sbin/dmidecode -s system-uuid"

This command queries low-level hardware, but is not available on Xen, as documented in several places: https://bugzilla.redhat.com/show_bug.cgi?id=210295, http://forum.slicehost.com/comments.php?DiscussionID=82.

In other words, there is no machine ID on Xen guests, so we will never be able to get it!

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Updated by Nicolas CHARLES about 13 years ago

It used to work, a long time ago...

bundle agent fusiAgent {
#...
  xen::
    "xen" 
    package_policy => "add",
    package_method => yum,
    classes => cf2_if_else("xen_installed", "cant_install_xen"),
    comment => "Installing xen package for extended data";
}

#...
bundle agent addInformationsToInventory {
#...
  xen::
    "UUID" string => execresult("/usr/bin/xenstore-read vm","noshell");
    "CFKEY" string => execresult("/bin/cat ${sys.workdir}/ppkeys/localhost.pub", "noshell");
    "USER" string => execresult("/usr/bin/whoami", "noshell");
    "usersnumber" int =>  readstringarray("userslist","/etc/passwd","#[^\n]*",":",50,4000);
    "users" slist => getindices("userslist");

  linux.!xen::
    "UUID" string => execresult("/usr/sbin/dmidecode -s system-uuid","noshell");
    "CFKEY" string => execresult("/bin/cat ${sys.workdir}/ppkeys/localhost.pub", "noshell");
    "USER" string => execresult("/usr/bin/whoami", "noshell");        
    "usersnumber" int =>  readstringarray("userslist","/etc/passwd","#[^\n]*",":",50,4000);
    "users" slist => getindices("userslist");
}

Reference : https://redmine.normation.com/projects/policy-templates/repository/revisions/bf0cc7bb79b772038d3e237b11a1df4825248755/entry/policies/initPolicies/ocsi-agent.cf

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Updated by Jonathan CLARKE about 13 years ago

Target version changed from 23 to 18

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Updated by Jonathan CLARKE about 13 years ago

Assignee deleted (~~Jonathan CLARKE~~)

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Updated by François ARMAND about 13 years ago

Target version changed from 18 to 24

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Updated by Jonathan CLARKE over 12 years ago

Assignee set to Vincent MEMBRÉ
Target version changed from 24 to Ideas (not version specific)

Vincent, this should interest you!

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Updated by Vincent MEMBRÉ over 12 years ago

Status changed from 2 to Discussion

I'm trying to have less information for our promises and I try to get machine ID with Fusion intead (Which is in HARDWARE -> UUID)

I'm going to try an inventory on a Xen VM.

But fusion uses dmidecode to determine machine ID so i think there will be a problem too...

If fusion can't find any machine ID, there's stille some solutions, we may:

- find a way to get an ID for Xen VM and submit that to fusion (in Nicolas Charles answer : "UUID" string => execresult("/usr/bin/xenstore-read vm","noshell");)
- We could generate a random machineID ... But it will create a new entry in LDAP for each Machine inventory, which is bad ...
- We could generate a random machineID and check if the node contained is already in ldap, if not insert the machine with generated machine ID, else Use the data from LDAP (Node ~~> container which give a machine ID) and use that machine ID instead~~
use a promises with "/usr/bin/xenstore-read vm" instead of "/usr/sbin/dmidecode -s system-uuid" (if it works...)

What do you think about those solutions ??

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Updated by François ARMAND over 12 years ago

Target version changed from Ideas (not version specific) to 2.4.0~rc2

I change the target version of that one because actual people are actually hit by that bug, see #2898.
Perhaps it's even a little worst than what explained here, because even the VM host doesn't have a MachineID.

To answer Vincent, we have two bugs:

1/ we are not able to fullfill the "MachineId" tag for Xen VM, and we should in some way (it's that one) ;
2/ we should be able to have some criteria on a machine other than only the MachineId (or hardware/uuid) to decide if a machine in a report is a new one or is already in our database (and so the old information should be updated). That's perhaps #2898, perhaps an other bug.

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