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Enthusiast
Enthusiast

Remote scratch partiction and syslog location

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We have diskless Hosts and we configure a remote scratch partition on a shared datastore. We also use the vCenter server as a remote syslog repository as well as another security server. A question came up about the "syslog.global.logdir". There was discussion of what should be defined here. One engineer was wanting to explicitly define this field with the remote scratch partition location while another suggested the default.

Can someone explain precisley where syslogs would be placed with each of the configurations below?

syslog.global.loghost  10.X.X.X,10.Y.Y.Y:514

syslog.global.defaultrotate 32

syslog.global.defaultsize 4096

syslog.global.logdir []/scratch/log

syslog.global.logdirunique true (checked)

syslog.global.loghost  10.X.X.X,10.Y.Y.Y:514

syslog.global.defaultrotate 32

syslog.global.defaultsize 4096

syslog.global.logdir [NFS-Datastore-1]/ESXiScratch/

syslog.global.logdirunique true (checked)

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Commander
Commander

If you have already configured the scratch location (scratchconfig.configuredscratchlocation) and rebooted the host, all the syslog files will already be put on the specified datastore. Also setting the syslog.global.logdir to the datastore isn't needed.

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Commander
Commander

On diskless hosts, /scratch is a symlink to /tmp/scratch. That same tmp folder is saved in memory. Which means, with a powercycle or reboot of the ESXi hosts, you lose all this information stored in /tmp.

~ # ls -allh scratch

lrwxrwxrwx    1 root     root           12 Sep 14 22:33 scratch -> /tmp/scratch

One big advantage of configuring the syslog.global.logdir towards the NFS datastore is the preservation of the logs on the moment that the ESXi host is rebooted or powercycled.

On servers where ESXi is installed on a local disk, the /scratch folder is configured automatically during installation (or first boot) of the ESXi host. On a local disk with sufficient space, a partition is automatically created.


~ # ls -allh scratch

lrwxrwxrwx    1 root     root          49 Jan  8 17:12 scratch -> /vmfs/volumes/5274f80b-ddd3ac19-e28b-a820661e2e1c

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Enthusiast
Enthusiast

Thanks. I guess my question is if we already define the scratch partion as [NFS-Datastore-1]/ESXiScratch with the "ScratchConfig.ConfiguredScratchLocation" configuration option won't syslog already be put there without defining it in "syslog.global.logdir"?

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Commander
Commander

If you have already configured the scratch location (scratchconfig.configuredscratchlocation) and rebooted the host, all the syslog files will already be put on the specified datastore. Also setting the syslog.global.logdir to the datastore isn't needed.

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Enthusiast
Enthusiast

Thanks. That's what I needed to confirm. I suppose it wouldn't hurt to set it but I prefer leaving default seetings where modfications to them are unnecessary.

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Commander
Commander

Sure, I agree with you on customizing settings that aren't really neccessary. You can mark answers as helpful or correct if you'd like.

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Enthusiast
Enthusiast

the way we set it up (all diskless ESXis)

syslog.global.logdir [datastore] <Logfile directory>

syslog.global.logdirunique true (checked)

Please notice on forward/backward slash and it works all good for us

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