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Rename uniqueid hostid
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basing it on hostid is not nearly unique enough especially in a xen environment with duplicated machines and multiple instances of IPs and MACs. I’d suggest something like serial number from BIOS (works for dell, hp, ibm, etc – significant portion of all x86 machines) modified by the system time when facter was initially installed.
#3 Updated by Greg Maples about 5 years ago
A variation of bios based serial number is available in all sun/solaris machines, all linux based dell, hp, aix/ibm, etc. It’s available on the mac, etc. I would think that covering 90% of your target user base with something virtually guaranteed to be unique, and using some other sequence for the 10% would be a fast and very useful approach.
#4 Updated by Luke Kanies about 5 years ago
Is uniqueid really a universal concept? I originally pulled it from Solaris, where it always worked, but I don’t think any other OS really has a consistently unique ID.
I’m comfortable renaming the fact to reflect that, since the label only really applies on Solaris.
#5 Updated by Greg Maples about 5 years ago
I think there’s a lot of value to be found in a uniquely computed identifier. even if it’s something like an sshkey, something with some random entropy. without it, temporarily spun up virtual machine instances will all look identical, even host name and IP can be similar or the same.
#6 Updated by Alan Barrett about 5 years ago
Luke Kanies wrote:
Is uniqueid really a universal concept? […] I’m comfortable renaming the fact to reflect that
I’d suggest renaming the fact to “hostid”, to better match the underlying operating system’s name for that identifier. If the OS doesn’t provide a gethostid() library function or a hostid command, then facter can simply omit the fact. If the hostid is not really unique, then it’s not facter’s fault; you can tell users to blame the OS vendor.
In other words, if the fact is called “uniqueid” then users will expect it to be unique, and will blame facter when it’s not unique; but if the fact is called “hostid” then users will be receptive to the idea that facter merely copies what the OS reports, and facter is not responsible for making it unique.
#8 Updated by Paul Nasrat about 5 years ago
- Subject changed from uniqueid not unique enough to Rename uniqueid hostid
- Status changed from Needs Decision to Accepted
I agree with the rename – splitting the two bugs along this (this one for rename which is where the discussion is and Issue #3762 for UUID which has more links for that).