Re: [CentOS] IBM buying RedHat

[Richard Zimmerman]

Please contact me off list

Many thanks,

Richard


Richard Zimmerman
River Bend Hose Specialty, Inc.

-Original Message-
From: CentOS  On Behalf Of John Plemons
Sent: Tuesday, October 30, 2018 3:44 PM
To: CentOS mailing list ; mark 
Subject: Re: [CentOS] IBM buying RedHat

If any one is interested, I have a brand new AS400 sitting upstairs in my 
computer room, it was a bought as surplus item, never used. I just hung onto 
it. It can be yours cheap, not wanting an arm and a leg for it, I would be open 
to a nice offer if anyone has an interest.

john plemons


On 10/30/2018 3:37 PM, mark wrote:
> Mark Rousell wrote:
>> On 30/10/2018 17:14, Simon Matter wrote:
> 
>> Yup. When I looked at IBM Power machines before (maybe about a year 
>> ago, not sure), there was actually a pricing tool on the website. You 
>> could go through various options for machines (GPUs, CPUs, storage, 
>> memory, etc.) and get a price. Annoyingly I didn't record detailed 
>> pricing info but, as I recall, the prices were painful but not 
>> totally out of comparison with high end x86-64 servers from HPE and 
>> the like. I wish I'd kept the quotes now.
>>
>>> IBM has the chance to change this now.
>>>
>> It would be nice if they would. But I think it be a very big step for 
>> them to willingly reduce prices unless and until other vendors can 
>> undercut them in a large enough scale. But it seems that a lot of 
>> people in larger businesses still like the security of "IBM" (even if 
>> they choose to run Linux on the boxes).
>>
> Unless I'm misremembering, these are midway between small server and 
> mainframe. I just did a search, and only found used systems, never 
> new, and they were all "refurbed", starting at $1500, and going up to $22k...
> and still refurbed.
>
> I think my guess of new, > $100k is about right.
>
>  mark
>
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Re: [CentOS] Intel Flaw

[Richard Zimmerman]

-Original Message-
From: CentOS [mailto:centos-boun...@centos.org] On Behalf Of Chris Olson
Subject: [CentOS] Intel Flaw

>How does the latest Intel flaw relate to CentOS 6.x systems that run under 
>VirtualBox 
> hosted on Windows 7 computers? 

My computer is  an much older AMD Athlon X2-250, 3.0ghz dual core, 02-2012
Windows 10 Pro (15063.850)

I just manually patched my system w/ the security only update from Microsoft. 
Used the Pass Mark CPU test... 

Before patch 1626, 1323 after patch or an 18.6% loss in speed.

Looking for a better test utility for Linux, but on my tested Linux boxen, 
doesn't seem to be any change But I'm using sysbench. Probably not the best 
utility in this case.

Regards,

Richard Zimmerman
River Bend Hose Specialty, Inc.

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Re: [CentOS] Offsite hosted backup solutions

[Richard Zimmerman]

-Original Message-
From: CentOS [mailto:centos-boun...@centos.org] On Behalf Of Nicolas Kovacs
Sent: Sunday, December 17, 2017 12:52 PM
To: centos@centos.org
Subject: Re: [CentOS] Offsite hosted backup solutions

> Can't say about Windows clients, but for all my Linux machines, I'm 

Hands down Veeam Endpoint Backup for Windows clients to a secure samba share. 
https://www.veeam.com/windows-endpoint-server-backup-free.html

1. Veeam Endpoint Backup is FREE (Seriously)

2. I backup to a Samba share that is locked to the user computer name and 
unique password
a. CentOS 6.9, Samba 3.x, RAID1 backup array 6 TB. (About 78% full)
b. WDC WD6002FFWX-68TZ4N0 Red Pro drives
c. 40 Windows clients on a 1g connection to BackupPC server (in name 
only)
d. Backups scheduled over a 12 hour period in the evening,
e. TWO off-site backups via USB 3.0 interface and external drives using 
rsync (takes roughly 6-9 hours depending on load)
f. ProLiant ML310e Gen8 v2, Intel(R) Xeon(R) CPU E3-1220 v3 @ 3.10GHz, 
8g ram, SSD / drive

3. YES, I've had to use it for BMR and it does work!
a. A BMR over the network is slow but works. Particular machine was a 
10/100 client.

Been using it for not quite 3 years now after finally giving up on BackupPC. 

I wrote a simple script to tell me when machines haven't backup in over 5 days 
so I can go pay attention to them. 

It's pretty much set and forget.

Regards,

Richard

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Re: [CentOS] low end file server with h/w RAID - recommendations

[Richard Zimmerman]

>Most servers can fit only 2.5" disks these days.  I keep wondering what 
>everyone is doing about storage.

The DL20 gen9 I bought was setup LFF (3.5")

The DL380 gen9 could be either SFF (2.5) or LFF. I had to buy SFF for our new 
server due I was told to spec / build it exact to vendor recommendation.

To better? Answer this. Agreed, I'm not a fanboy of 2.5" stuff in enterprise 
equipment. To me a better but more costly answer would be setup a LFF SAN 
server and go from there. 

My employer is a SMB (60 people?) and our storage is exploding at times. SAN's 
can give more economical storage and flexibility. Especially since were 
considering fail-over scenarios for not only our Windows ERP software but our 
all Linux based :) file servers.

Regards,

Richard

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Re: [CentOS] low end file server with h/w RAID - recommendations

[Richard Zimmerman]

I can help a little here... Yes, dropping NPAPI is a huge problem. FireFox ESR 
is available for Linux x32 and x64.

Solved my problems using Lantronix Spider IP/KVM device until Java updates, 
then refuses to run it yet again :(

https://www.mozilla.org/en-US/firefox/organizations/faq/

Hopes this helps

Richard


-Original Message-
From: CentOS [mailto:centos-boun...@centos.org] On Behalf Of Leroy Tennison
Sent: Thursday, November 2, 2017 11:08 AM
To: centos
Subject: Re: [CentOS] low end file server with h/w RAID - recommendations

Good to know about the HPE and Dell "gotchas", thanks to those who posted.

I can speak to SuperMicro (11 systems, mostly X9 and X10).  Hardware seems to 
be fine, management utilities (IPMI - like iLO) are more basic.  The real 
heartburn right now is that the browsers for Linux have pretty much dropped 
NPAPI which means remote console doesn't work since it needs Java.  They have 
alternatives on their web site (look for IPMIView and IPMICFG).  One of their 
solutions only works with Gnome (but I don't remember which one - too long 
ago).  Differing versions of IPMI firmware have their own quirks.  Bottom line: 
support is there but more basic and not as easy to use.
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Re: [CentOS] low end file server with h/w RAID - recommendations

[Richard Zimmerman]

hw wrote:
>Next question: you want RAID, how much storage do you need? Will 4 or 8 3.5" 
>drives be enough (DO NOT GET crappy 2.5" drives - they're *much* more 
>expensive than the 3.5" drives, and >smaller disk space. For the price of a 
>1TB 2.5", I can get at least a 4TB WD Red.

I will second Marks comments here. Yes, 2.5" drive enterprise drives have been 
an issue. +1 for the WD Red drives, so far 3.5" w/ 2tb and 4tb drives, ZERO 
issues. I've had good luck with HGST NAS drives too. Unfortunately, that will 
come to an end soon (With WD owning HGST).

Regards,

Richard

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Re: [CentOS] low end file server with h/w RAID - recommendations

[Richard Zimmerman]

I just put a call into AT Office 365 asking them to explain the spoof warning 
thing...

To answer your question

At the moment, no I can't. I like HPE stuff, we bought a DL380 gen9 say five 
months ago and totally happy with it. In fairness, its running Server 2012 r2 
too but I didn't run into the hardware gotchas I did on the other stuff. It 
just seems HPE skimped on their lower end stuff and CentOS 6.x doesn't play 
well. 

This whole incident with the DL20 JUST happened. It's (finally) been spinning 
Server 2012 r2 for about a week now. It was a long 5 week process just to get 
to to this answer.

I haven't had the time to research out what my next buys are going to be. I'm 
listening as well if someone has a suggestion.

Honestly, I'm leaning against Dell because their stuff just doesn't seem to be 
built to last. We have 1 T620, 2 R620 servers. So far just past the 5 year 
mark, 3 dead hard drives, 2 power supplies. That is with the machines mostly 
TURNED OFF. (Failed IT project after I was hired; aborted a move to a new ERP 
system) With my personal Dell laptop just bought 4 months ago, periodically get 
the 6 beep on power on error. Tells me Dell quality / quality control might not 
be where it needs to be. 

Then again, I get a constant flow of HPE advisories. :(

I've thinking of taking a look at Supermicro severs. 

Bottom line is, they all have their quirks, problems, deficiencies

WHY did Lenovo have to quit selling the RS140's? I *LOVE* those machines 
Fast, reliable and just work GREAT with Centos 6.9!

Regards,

Richard


-Original Message-
From: CentOS [mailto:centos-boun...@centos.org] On Behalf Of hw
Sent: Thursday, November 2, 2017 9:09 AM
To: centos@centos.org
Subject: Re: [CentOS] low end file server with h/w RAID - recommendations

Richard Zimmerman wrote:
> DO NOT buy the newer HPE DL20 gen9 or ML10 gen9 servers then (especially if 
> using CentOS 6.x)

What would you suggest as alternative, something from Dell?
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Re: [CentOS] low end file server with h/w RAID - recommendations

[Richard Zimmerman]

DO NOT buy the newer HPE DL20 gen9 or ML10 gen9 servers then (especially if 
using CentOS 6.x)

I don't use hardware raid (mdadm for the win!) so cannot speak to that.

DL20, bought it on a stock 'B' sale. Great price. Works well on Windows. HPE 
doesn't sell hard drive trays, etc. You pretty much have to buy their equipment.

You CAN get 3rd party parts (drive trays, etc.) but will nickel and dime you. 
Example, try to get an HPE-ODD power to sata power adapter. I haven't been able 
to locate one. The one HPE sells, doesn't work on a standard SSD drive. **NO** 
standard place inside machine to mount an SSD drive either. **NO** standard 
power connectors either. So trying in install a bootable SDD, then raid your 
storage drives will be a task. One I gave up on.

THEIR website says the DL20 gen9 it supports CentOS 6.x In reality, NO 
unless you want the pain of downloading, compiling drivers, etc. 
If you don't use THEIR hard drives, they work but you don't get "LED Support" 
from the smart array controller. i.e. A drive craps, the smart array won't lite 
up the dead drive tray. You have a 50/50 shot at guessing which one. At least 
the Smart Array software (in Windows) will tell you what bay its in.

The DL20 once you get past the crap in setting it up (again, you have to use 
the smart provisioning utility to install server 2012 r2 on it; Seriously HPE) 
but once up and running, so far no more headaches.

My ML10 gen9 experience is a mix. 

The newer ML10 gen9 experience was worse. First several installs just never ran 
right. Unexplained lockup and crashes. Onboard nic never ran right. Now, it's 
using a transplanted install of CentOS 6.9, using installed Intel nics and this 
setup so far is running pretty well, no issues so far.

On the other hand, I've got an year (maybe two) older ML10 gen9 running CentOS 
6.9. Hasn't given me a day of trouble from day one. 

Hopefully some of this helps...

Regards,

Richard


-Original Message-
From: CentOS [mailto:centos-boun...@centos.org] On Behalf Of vychytraly .
Sent: Thursday, November 2, 2017 8:28 AM
To: CentOS mailing list
Subject: Re: [CentOS] low end file server with h/w RAID - recommendations

Hello, what is the purpose of this server?

On Thursday, November 2, 2017, Gary Stainburn  wrote:
> I'm just about to build a new server and I'm looking for 
> recommendations
on
> what hardware to use.
>
> I'm happy with either a brand name, or building my own, but would like 
> a hardware RAID controller to run a pair of disks as RAID1 that is 
> actually compatible with and manageable through Linux.
>
> Any recommendations would be appreciated.
>
> Gary
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Re: [CentOS] VPN suggestions centos 6, 7

[Richard Zimmerman]

SoftEther VPN

Once setup, it just works

Regards,

Richard


---
Richard Zimmerman
Systems / Network Administrator
River Bend Hose Specialty, Inc.
 S Main Street
South Bend, IN   46601-3337
(574) 233-1133
(574) 280-7284 Fax

-Original Message-
From: centos-boun...@centos.org [mailto:centos-boun...@centos.org] On Behalf Of 
david
Sent: Monday, April 04, 2016 1:57 PM
To: CentOS mailing list
Subject: [CentOS] VPN suggestions centos 6, 7

Folks

I would like to have my windows 7 laptop communicate with my home server via a 
VPN, in such a way that it appears to be "inside" my home network.  It should 
not only let me appear to be at home for any external query, but also let me 
access my computers inside my home.

I already have this working using M$'s PPTP using my home Centos 6 
gateway/router as the PoPToP server.  However, I am concerned about the 
privacy/security of such a connection.

I have seen discussions of OpenVPN, OpenSwan, LibreVPN, StrongSwan (and 
probably others I haven't noted).  I'd be interested in hearing from anyone who 
wishes to comment about which to use, with the following requirements:

1)  As noted, it should be secure (anti NSA?)
2)  Works on Centos 6 and Centos 7 and Windows 7 (and for the future, Windows 
10)
3)  Can be set up on the server with command line interfaces only (no GUI)

And, should not be a nightmare to set up.

Any thoughts?

David

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Re: [CentOS] In A UEFI World, "rm -rf /" Can Brick Your System

[Richard Zimmerman]

>> Excerpt:
>> Running rm -rf / on any UEFI Linux distribution can potentially perma-brick 
>> your system.
>
> "And they closed the ticket"? That tuxedo on the cockroach is so elegent!
> Ok, *now* tell me why we shouldn't hate systemd?
>   mark

As much as I don't like systemd, it has NOTHING to do with system and 
everything to a poor admin or newbie blindly following others advice. 

My suggestion is to ALWAYS fully qualify *ANY* directory you want to rm -rf, 
period. 

I speak from experience. Years ago had a script that would cd into a directory 
and then rm - rf * it. Problem started when I accidently deleted said dir and 
the PREVIOUS dir was /. Needless to say, the server was happily committing 
suicide before I figured out the problem.

Lessons learned:
1. Fully qualify ANY rm -rf command
2. Make sure you always have good backups, I did!
3. I became really, really good at disaster recovery :)
4. Upper Management WILL get cranky over an event like this!

Just my 2 cents worth...

Richard


---
Richard Zimmerman
Systems / Network Administrator
River Bend Hose Specialty, Inc.
 S Main Street
South Bend, IN   46601-3337
(574) 233-1133
(574) 280-7284 Fax

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Re: [CentOS] Two WiFi routers

[Richard Zimmerman]

-Original Message-
From: centos-boun...@centos.org [mailto:centos-boun...@centos.org] On Behalf Of 
Timothy Murphy
Sent: Wednesday, November 04, 2015 9:07 AM
To: centos@centos.org
Subject: Re: [CentOS] Two WiFi routers

Timothy Murphy wrote:

> Thanks for your response.
> Do you have them on different channels?

YES, definitely If you have the room in the spectrum, ch1, skip2, ch3, skip 
4, ch5, etc... I've actually have mine set with two empty channels between them 
as the 3rd building is a machine / fabrication shop with lots and lots of RFI 
going on.

Regards,

Richard


---
Richard Zimmerman
Systems / Network Administrator
River Bend Hose Specialty, Inc.
 S Main Street
South Bend, IN   46601-3337
(574) 233-1133
(574) 280-7284 Fax

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Re: [CentOS] Two WiFi routers

[Richard Zimmerman]

The question is quite vague but the answer is yes.

I've got a 3 building network...

Buildings 1/2 between then have 3 wireless routers all pointed to one CentOS 
server.

The 3rd building across the WAN has 3 wireless routers all into one server...

In my case They are for local LAN access so they are setup to pint to a single 
IP/gateway address...

** or **

If you need them on different network segments, answer is still yes...

Setup each wireless on it's own network segment and then add multiple IP's to 
the nic on the server. Firewall rules to keep them separate if you need.

Hopes this helps...

Richard


---
Richard Zimmerman
Systems / Network Administrator
River Bend Hose Specialty, Inc.
 S Main Street
South Bend, IN   46601-3337
(574) 233-1133
(574) 280-7284 Fax

-Original Message-
From: centos-boun...@centos.org [mailto:centos-boun...@centos.org] On Behalf Of 
Timothy Murphy
Sent: Wednesday, November 04, 2015 7:40 AM
To: centos@centos.org
Subject: [CentOS] Two WiFi routers

Can I have two WiFi routers on the same LAN on my CentOS server?

--
Timothy Murphy
gayleard /at/ eircom.net
School of Mathematics, Trinity College, Dublin


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Re: [CentOS] I want to connect to a l2tp server from centos.

[Richard Zimmerman]

-Original Message-
From: centos-boun...@centos.org [mailto:centos-boun...@centos.org] On Behalf Of 
Eliezer Croitoru
Sent: Friday, September 18, 2015 2:21 AM
To: centos@centos.org
Subject: Re: [CentOS] I want to connect to a l2tp server from centos.

http://www.softether.org/>

   For what it's worth, it runs just fine downloading and running it directly. 
I will agree, they usually only release beta versions so we hang back one or 
two beta's from the latest. In my case SoftEther VPN "just works". I will say 
if you are new to VPN's as I was (and still learning) it'll drive you nuts at 
times setting things up to make it all mesh together. Router tables, firewall 
rules, etc. Once your golden, you can literally forget how it works. Yup, took 
plenty of notes. (Hopefully they are good enough :) )

   We have a remote office and my home lan VPN'd into the server (All CentOS 
6.7 boxen) on a virtual hub. My remote users (Windows only so far) VPN in on a 
separate virtual hub and so far it has gone well. Kudos to SoftEther VPN for a 
double click to start, double click to stop a VPN connection in Windows!

   I also wrote a script to setup the tap interfaces, routing table entries and 
do several test pings to make sure the links setup correctly. This was done 
because softEther VPN would be ready to go before the TAP interfaces were up 
and ready and caused issues.

   My smartphone users can connect via l2tp/IPsec but no one (including me) 
wants to mess with it. It would be really nice if the SoftEther VPN folks would 
write a smartphone client. 



   Yes the GUI is Windows only (as far as I know) but works well no matter what 
platform the server is running well.




   Because my employer has AT Fiber/PNT/firewall/VPN services (read software 
defined networking) I'm actually happy my main support is SSL-VPN (via https) 
Makes my life a lot easier. It's to the point our company has decided NOT to 
use the AT global network client in favor of SoftEther VPN for our remote 
needs.

Kind regards,

Richard



SRPM can be found here:
http://ngtech.co.il/rpm/centos/7/SRPMS/softethervpn-4.18.9570-2.el7.centos.src.rpm

The repo is here(also latest squid-cache repo):
http://ngtech.co.il/rpm/centos/7/x86_64/

Eliezer





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 S Main Street
South Bend, IN   46601-3337
(574) 233-1133
(574) 280-7284 Fax

On 18/09/2015 04:33, Eliezer Croitoru wrote:
> Hey John,
>
> I do not require encryption at all, it's a secure and internal channel 
> but it requires me to connect via either pptp or l2tp.
> This is the reason I am asking.
> I had the chance of finding the SoftEther Project which gives a lot in 
> terms of VPN Client and Server.
> At:
> http://www.softether-download.com/en.aspx
>
> But yet to try it.
> Also they have all sorts of beta versions but not something they call 
> stable in their downloads.
>
> I think I will try to use their product if I will not find an example 
> on how to use l2tp without ipsec encryption.
>
> Thanks,
> Eliezer
>
> On 18/09/2015 03:00, John R Pierce wrote:
>> On 9/17/2015 4:47 PM, Eliezer Croitoru wrote:
>>> I have a server currently connecting to a pptp remote server.
>>> This server(lns\lac) has the option for pptp connections and l2tp 
>>> connections.
>>> The l2tp connections are not using ipsec encryption at all.
>>
>> PPTP doesn't use ipsec either, it uses its own MPPE encryption based 
>> on RC4, which is considered insecure as of years ago.
>>
>> L2TP is normally used within another encrypted transport.
>
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Re: [CentOS] Backups solution from WinDoze to linux

[Richard Zimmerman]

I don't chime in very often but here it goes.

   I'm running BackupPC-3.3.1-1.el6.x86_64 on CentOS 6.6. The server is an HP 
ProLiant ML310e Gen8 v2 (dynamic p400 controller DISABLED); 8gb ram, 1.5tb 
raid1 . Boot/OS drive is an ssd and /var/lib/BackupPC is mounted on an 
LVM/RADI1 array. I'm currently backing up 41 pc's and one Server 2011 
Essentials.

BackupPC Server Status

General Server Information

The servers PID is 37442, on host backuppc, version 3.3.1, started at 7/13 
16:20.
This status was generated at 7/14 11:08.
The configuration was last loaded at 7/13 16:20.
PCs will be next queued at 7/14 14:00.
Other info:
0 pending backup requests from last scheduled wakeup,
0 pending user backup requests,
0 pending command requests,
Pool is 530.20GB comprising 2040949 files and 4369 directories (as of 
7/12 14:15),
Pool hashing gives 1909 repeated files with longest chain 25,
Nightly cleanup removed 5788 files of size 0.03GB (around 7/12 14:15),
Pool file system was recently at 42% (7/14 11:02), today's max is 42% 
(7/14 00:42) and yesterday's max was 39%.

Hosts with good Backups

There are 42 hosts that have been backed up, for a total of:

124 full backups of total size 4990.74GB (prior to pooling and compression),
191 incr backups of total size 388.68GB (prior to pooling and compression). 

** I just recently changed my setup to keep 3 full and 6 incremental backups so 
these numbers are in the process of growing **

I USED to run various renditions of rsync and finally GAVE UP on it as it NEVER 
would backup up the Windows computers to my satisfaction.  (rsync on linux 
rocks however)

I finally switched over to using SMB to back up the Windows boxen.  I use the 
admin account for this as creating a backuppc user account assigned to the 
backup operators group wouldn't even back up the boxes correctly. 

While not ideal security wise I CAN SAY I backup 42 computers every night, 
important files like outlook.pst GETS BACKED UP, and my BackupPC life is 
significantly easier.

I use the following for the wakeup schedule: $Conf{WakeupSchedule} = [14,17];

For backing up the BackupPC pool, I am running software raid.  I use mdadm to 
attach a 3rd disk to the mirror which sync's the mirror to the 3rd drive, then 
fail the 3rd disk and shrink the array back to two. Others have suggested Btrfs 
or zfs? For a send/receive backup method and I am going to try this as time 
allows.

You can NEVER have too many backups. I'd slap it to tape if I could...

Hopefully some of this information helps out...

Regards,

Richard


---
Richard Zimmerman
Systems / Network Administrator
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 S Main Street
South Bend, IN   46601-3337
(574) 233-1133
(574) 280-7284 Fax

-Original Message-
From: centos-boun...@centos.org [mailto:centos-boun...@centos.org] On Behalf Of 
m.r...@5-cent.us
Sent: Tuesday, July 14, 2015 10:17 AM
To: CentOS
Subject: [CentOS] Backups solution from WinDoze to linux

My manager just tasked me at looking at this, for one team we're supporting. 
Now, he'd been thinking of bacula, but I see their Windows binaries are now 
not-free, so I'm looking around. IIRC, Les thinks highly of backuppc; comments 
on that, or other packaged solutions?

 mark

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[CentOS] Bare drive RAID question, was RE: *very* ugly mdadm issue [Solved, badly]

[Richard Zimmerman]

-Original Message-
From: centos-boun...@centos.org [mailto:centos-boun...@centos.org] On Behalf 
Of m.r...@5-cent.us
Sent: Thursday, September 04, 2014 4:31 PM
To: CentOS mailing list
Subject: Re: [CentOS] *very* ugly mdadm issue [Solved, badly]

Ok, folks,

   Here's the answer: making a software RAID on a bare drive with no GPT works 
 fine. If it has a GPT, and no partition, it fails on reboot, even with an 
 /etc/mdadm.conf.

   I've proved this:
   first, I created the array on the bare drive, rebooted, and
/dev/md0 was there;
   then, I used parted to create a gpt, then the array, reboot, no md0, 
 even with mdadm --assemble, even with /etc/mdadm.conf.
   finally, I got rid of the disk label (parted to make an msdos label, 
 the zeroing out the beginning of the disk), and again made the RAID on the 
 bare drives, reboot, and md0 is there.

   So that's what killed me. Admins, take heed
mark

If you all would mind...

Until I read this thread, I've never heard of building RAIDs on bare metal 
drives. I'm assuming no partition table, just a disk label?

What is the advantage of doing this?

Many thanks,

Richard


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---
Richard Zimmerman
Systems / Network Administrator
River Bend Hose Specialty, Inc.
 S Main Street
South Bend, IN   46601-3337
(574) 233-1133
(574) 280-7284 Fax
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Re: [CentOS] Bare drive RAID question, was RE: *very* ugly mdadm issue [Solved, badly]

[Richard Zimmerman]

-Original Message-
From: centos-boun...@centos.org [mailto:centos-boun...@centos.org] On Behalf Of 
Les Mikesell
Sent: Friday, September 05, 2014 12:54 PM
To: CentOS mailing list
Subject: Re: [CentOS] Bare drive RAID question, was RE: *very* ugly mdadm issue 
[Solved, badly]

On Fri, Sep 5, 2014 at 9:01 AM, Warren Young war...@etr-usa.com wrote:

 So the real question is, why do you believe you need to make each RAID 
 member a *partition* on a disk, instead of just take over the entire disk?
 Unless you're going to do something insane like:

 /dev/md0
/dev/sda1
/dev/sdb1
 /dev/md1
/dev/sda2
/dev/sdb2

 ...you're not going to get any direct utility from composing a RAID 
 from partitions on the RAID member drives.

 (Why insane?  Because now any I/O to /dev/md1 interferes with I/O to 
 /dev/md0, because you only have two head assemblies, so you've wiped 
 out the speed advantages you get from RAID-0 or -1.)

Well, to exactly the same extent that putting multiple partitions and
filesystems on a non-raid drive is insane for those reasons...   And
you generally can't avoid this if you want to boot from the same disks
where you store data with mirroring.   And the very nice up side is
that you can now pull your drives out, put them in different bays, add others, 
etc. and the system will still assemble the right partitions into the right 
raid devices and mount them correctly.  Or at least it would in the  2TB 
days...

 There are ancillary benefits, like the fact that a RAID element that 
 spans the entire partition is inherently 4k-aligned.  When there is a 
 partition table taking space at the start of the first cylinder, you 
 have to leave the rest of that cylinder unused in order to get back into 4k 
 alignment.

Isn't it possible to duplicate that when you make a single partition
and use the partition as a raid member?   And get autoassembly if it
is less than 2TB?I consider it a real loss that autoassembly
doesn't work on large drives.  People will almost certainly lose data in some 
scenarios as a result.

 The only downside I saw in this thread is that when you pull such a 
 disk out of a Linux software RAID and put it into another machine, you 
 don't see a clear Linux partition table, so you might think it is an 
 empty drive.  But the same thing is true of a hardware RAID member, too.

I've always liked software raid1 just because you can recover the data
from any single drive on any machine with a similar interface.   But,
I guess that's why we have backups...

I just wanted to say thank you for the replies Wow, I got schooled today 
(in a good way). Much learning going on in my corner of the world...

Richard


---
Richard Zimmerman
Systems / Network Administrator
River Bend Hose Specialty, Inc.
 S Main Street
South Bend, IN   46601-3337
(574) 233-1133
(574) 280-7284 Fax

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Re: [CentOS] Disable login at boot

[Richard Zimmerman]

anything you want running automatically, put it in a service script in 
/etc/rc.d/init.d and symlinked to appropriate run level directories via 
chkconfig servicename on

or put it in /etc/rc.local although that method is rather deprecated.

I guess I'm an artifact :)

I use /etc/rc.local.machinename and chkconfig level 99 to start my local 
scripts... Guess some old habits don't die very well :)

As far as local logins, yes don't disable it and use a strong password.

For remote logins, I use 4096 bit encryption, disable root and password logins 
and use 4096 bit rsa_keys to login as a local user. Then su to root to do what 
I need to. I love looking at the logs and seeing the foolish saps who keep 
trying brute force password attacks :)

For backups I use rsync and give the local user su rights to it.

Hopefully some of this helps...

Richard


---
Richard Zimmerman
Systems / Network Administrator
River Bend Hose Specialty, Inc.
 S Main Street
South Bend, IN   46601-3337
(574) 233-1133
(574) 280-7284 Fax

-- 
john r pierce  37N 122W
somewhere on the middle of the left coast

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Re: [CentOS] Set static IP

[Richard Zimmerman]

I've always known the config file to be 
/etc/sysconfig/network-scripts/ifcfg-eth0

Sample:
DEVICE=eth0
BOOTPROTO=static
ONBOOT=yes
TYPE=Ethernet
IPADDR=xxx.xxx.xxx.xxx
NETMASK=255.255.255.xxx
DEFROUTE=yes
IPV4_FAILURE_FATAL=yes
IPV6INIT=yes
NETWORKING_IPV6=yes
NAME=System eth0
HWADDR=xx:xx:xx:xx:xx:xx

IP addresses changed to protect the guilty :)

Hopes this helps...

Richard

-Original Message-
From: centos-boun...@centos.org [mailto:centos-boun...@centos.org] On Behalf Of 
Eric Falbe
Sent: Thursday, May 15, 2014 3:47 PM
To: CentOS mailing list
Subject: Re: [CentOS] Set static IP

Not sure if the problem, but BOOTPROTO=static should be BOOTPROTO=none.
Eric Falbe
On 05/15, Joseph Hesse wrote:
 Hello,
 I want my CentOS 6.5 computer to have a static IP.  Currently I get 
 the IP I want because I have my router assign it on the basis of mac address.
 I placed the following file as:
 /etc/sysconfig/networking-scripts/eth0
 
 DEVICE=eth0
 BOOTPROTO=static
 HWADDR=00:1F:D0:9E:AE:67
 ONBOOT=yes
 TYPE=Ethernet
 USERCTL=no
 IPV6INIT=no
 PEERDNS=yes
 NETMASK=255.255.255.0
 IPADDR=192.168.0.99
 GATEWAY=192.168.0.1
 NM_CONTROLLED=no
 
 I also disabled Network Manager with chkconfig.
 
 It didn't work.  When I rebooted I had no IP address for eth0. Should 
 I leave all the other scripts in /etc/sysconfig/networking-scripts unchanged?
 
 Suggestions would be appreciated.
 
 Thank you,
 Joe
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