[lug] LPIC-2 exam (1st one)

[Bear Giles]

RHCSA/LPIC-1 means they can let you on the computer room floor without too
much worry you'll accidently burn the place down. You'll still need
supervision but you'll know why 'dd if=/dev/zero of=/dev/sda' is a bad idea
if someone asks them to do it.

RHCE/LPIC-2 means that they can give you a much more abstract task, e.g.,
set up a new web server and get it fully integrated into the existing
infrastructure.

I need to focus on my prep but a part of me is still running through S&G
scenarios. E.g., I know the micro-SD card on a rpi is so slow that people
are usually told to use an NFS mount for any serious work - just boot from
the micro-SD and only use it to store stuff where performance doesn't
matter. However from an earlier discussion I know that a USB-3 port can be
pretty fast. I don't know if it's fast on an rpi (and I don't even know if
the latest rpis have USB-3 ports) but it got me wondering about checking
out some of the stuff in the class. Take a rpi, set it up as an iSCSI
target, and then use it to set up drives on some of my linux systems. The
rpi would be a SAN device instead of a traditional network filesystem.

It has drawbacks, e.g., unlike Samba and NFS you can't have multiple
clients access the files at the same time. On the other hand it looks like
a local drive and might be a little faster than Samba/NFS since it's only
used to move blocks back and forth and doesn't try to interpret them. It
could also be conceptually easier to secure if your systems are dual-nic so
you could do all of this on a separate wires and switch than the one
connected to your wifi and the internet.



On Tue, Nov 13, 2018 at 7:50 AM BC <bcarr at purgatoire.org> wrote:

>
>
> On 11/13/2018 7:25 AM, Bear Giles wrote:
>
>
> The main omission in the videos was IPv6. It covered a lot of networking
> stuff but (in retrospect) didn't cover IPv6 at all. It didn't stand out
> since I don't use IPv6. I should - at least on my home network - just so I
> start to become familiar with it. I know comcast didn't provide IPv6 to
> residential users a while back but maybe that has changed.
>
>
> Congratulations on your testing (all the abbreviations are an alphabet
> soup to me.)
>
> Comcast has had all their residential customers on IPv6 for some time
> (this according to a business-class tech who was here a couple of years ago
> doing some work). I've only tested several residential customers' setups
> and sure enough, IPv6 on all of them with no evidence of any IPv4. The
> business-class side of Comcast is all IPv4 with no option for IPv6 at this
> time (at least it hasn't been offered to me, so I use Hurricane Electric's
> free IPv4-to-IPv6 service just to play around [at this time, I only use
> IPv6 to poll some time servers]).
>
> A couple of years ago I spent a month learning IPv6. It really is much
> better than IPv4. Takes some getting used to and the size of the address
> space is beyond imagination. You'll enjoy learning it...
>
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