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Remounting Linux read-only file systems read-write
I've been paged countless times to investigate systems that have gone off the air for one reason or another. Typically when look into these issues the server has crashed unexpectedly (bug, hardware, etc.) and rebooted in an attempt to get a fresh start on life. On occassion the box won't boot due to a misconfiguration or inconsistent file system, and the server will be left with a read-only root file system and no network connectivity. Fixing this is pretty easy…
$ read more →Update on my quest to find the perfect NAS device for home use
A few months back I started looking into NAS solutions that would be ideal for home use. I jotted down my initial research in the post building your own nas and the post making sense of the various nas solutions. My original intent was to purchase an HP microserver from Amazon and test out all of the freely available NAS solutions. Due to some time constraints I cancelled my microserver order and re-used a server I had at home…
$ read more →Integrating Linux with LDAP presentation
I gave a talk tonight at the local UNIX uers group on integrating Linux servers with LDAP. The slide desk is now available, and I want to thank everyone for coming out! The talk was a bunch of fun, and I appreciate all of the questions I received. Hopefully I can come back out later this year to talk about FreeIPA.
$ read more →Would you be interested in RFC cliff notes?
I've been toying with the idea of reading one RFC a week and developing cliff notes so I can remember everything I read down the road. While I can always recall WHERE I read something, sometimes I need to go out and read the section in the RFC a second time to verify the details. All of the major protocols have a slew of RFCs associated with them, and I'm thinking about starting with DNS, moving on to SMTP, HTTP and NFS. While I've used solutions that heavily rely on these protocols, I've never read the RFCs from beginning to end…
$ read more →Undeleting a file that resides on a Linux EXT3 or EXT4 file system
I have on a couple of occasions been asked to restore files that were deleted. I've been fortunate up to this point that I have always been able to get the deleted file back, either through file system manipulation, dd'ing of a device or by restoring the file from a previous back up. One thing I've never quite understood is why UNIX and Linux Operating Systems don't ship with a undelete utility for each file system type. Assuming you don't zero out the metadata and the data blocks haven't been re-used, restoring a file is pretty straight forward…
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