Search results for "meeting" - WLUG

Re: Looking for advice for home server

by Jon "maddog" Hall

Kevin, You might want to take a look at the Freedombox.org software: https://freedombox.org Run your digital services from your home > FreedomBox is a private server for non-experts: it lets you install and > configure server applications with only a few clicks. It runs on cheap > hardware of your choice, uses your internet connection and power, and is > under your control. It has a front panel and was designed for people who are running a home server and are not super-admins, although I do not think that it is "Mom&Pop(TM)" ready either. There is a lot of functionality there.....you do not have to set up everything all at once. 99% of the software has been incorporated into Debian 11 and Debian 12, and therefore runs on a variety of hardware platforms, everything from an old laptop to a Raspberry Pi 5 (which can go up to 8 GB of RAM for 80 USD). The RPi 5 has a PCI-e bus built in and there are "Hats" that allow you to add two M.2 solid state memory cards to set up RAID. The 1 Gbps ethernet connection would probably give you all the throughput you need. md On Sat, Aug 3, 2024 at 4:10 PM Kevin Stratton via WLUG <wlug(a)lists.wlug.org> wrote: > I am looking for a cheap solution for the following: > > 1) Email server/redireector. I want to have a full custom domain and > email addre0ss. > > 2) FTP server on the same domain as the email server. > > 3) GUI setup preferred, I do not want to invest the time (right now) to > get this working as a 'ground up' > > project. > > 4) Total bandwidth needs should be negligible. > > > How would you approach this? > > At a very high level, I am considering: > > 1) Dedicating a DDR3 (RAM) era Intel I3 P.C. (sorry, I don not know the > generation) and installing NAS software with the appropriate docker > plugins, if they exist. I do not know if this is even reasonable. > Suggestions are appreciated. I am using a home ISP account. I am aware > of DynDNS type services to get around the lack of a static IP. I do not > currently plan on using this device as an actual NAS due to security > concerns. If necessary, I will use sneaker-net to transfer data, > although I am thinking about ssh or even RS232. > > 2) Renting out space on a service like Amazon Web services. Maybe they > have an image that is already what I want. > > Any ideas/thoughts/experiences would be appreciated. I hope to be at > the meeting next Thursday. > > > > > > > > > > > > > > > > > _______________________________________________ > WLUG mailing list -- wlug(a)lists.wlug.org > To unsubscribe send an email to wlug-leave(a)lists.wlug.org > Create Account: https://wlug.mailman3.com/accounts/signup/ > Change Settings: > https://wlug.mailman3.com/postorius/lists/wlug.lists.wlug.org/ > Web Forum/Archive: > https://wlug.mailman3.com/hyperkitty/list/wlug@lists.wlug.org/message/4MMUM… >

Aug. 4, 2024

Re: Wlug digest, Vol 1 #267 - 4 msgs

by Pierce C. Barnard

At 12:01 PM 3/11/2002 -0500, you wrote: >Send Wlug mailing list submissions to > wlug(a)mail.wlug.org > >To subscribe or unsubscribe via the World Wide Web, visit > http://mail.wlug.org/mailman/listinfo/wlug >or, via email, send a message with subject or body 'help' to > wlug-request(a)mail.wlug.org > >You can reach the person managing the list at > wlug-admin(a)mail.wlug.org > >When replying, please edit your Subject line so it is more specific >than "Re: Contents of Wlug digest..." > > >Today's Topics: > > 1. Question (Pierce C. Barnard) > 2. Re: Question (Andy Stewart) > 3. Re: Chart generation tools (John Stoffel) > 4. Re: Chart generation tools (Charles R. Anderson) > >--__--__-- > >Message: 1 >Date: Sun, 10 Mar 2002 21:09:58 -0500 >To: wlug(a)mail.wlug.org >From: "Pierce C. Barnard" <pcbarnard(a)earthlink.net> >Subject: [Wlug] Question >Reply-To: wlug(a)mail.wlug.org > >Hi, I recently purchased SuSE V7.3 and when I shut it down, it hangs while >shutting down all of the system processes. How can I fix this problem with >the shut down proceedure? > > >--__--__-- > >Message: 2 >charset="iso-8859-1" >From: Andy Stewart <andystewart(a)attbi.com> >Organization: Worcester Linux Users' Group >To: wlug(a)mail.wlug.org >Subject: Re: [Wlug] Question >Date: Sun, 10 Mar 2002 21:34:17 -0500 >Reply-To: wlug(a)mail.wlug.org > >On Sunday 10 March 2002 09:09 pm, you wrote: > > Hi, I recently purchased SuSE V7.3 and when I shut it down, it hangs > > while shutting down all of the system processes. How can I fix this > > problem with the shut down proceedure? > > > > _______________________________________________ > > Wlug mailing list > > Wlug(a)mail.wlug.org > > http://mail.wlug.org/mailman/listinfo/wlug > >Hi Pierce, > >I am a SuSE user. I would like to help, but I believe that I need more >information in order to give you an accurate answer. > >Exactly which command are you using to shutdown the system? Can you send >along a snippet of the last few lines of output on the terminal before it >hangs? Does it always hang in the same place? With this type of >information, I believe that the problem can be diagnosed. > >See ya later, > >Andy > >-- >Andy Stewart >Founder >Worcester Linux Users' Group >Worcester, MA, USA >http://www.wlug.org Hello Andy, the error occurs when I log out of KDE. Then at the Linux desktop login window, I select shutdown, and then SuSE is shutting down, it hangs at the point where the drive shares are umounted and then inet says that the system will be halted immediately. It is at this point that SuSE will say that runtime level 0 has been reached, that it has stopped completely. At this point, the system is still running and I can not turn it off, except by turning the power off. What do you think is causing this to happen? and I will be at the WLUG meeting on this Wednesday. Thank you.

March 12, 2002

Re: [Wlug] Release cycle for RHEL / CentOS 6

by John Stoffel

Just a quick question, but what feature of Python 2.7 did the hook depend on and could it have been re-written to only need Python 2.6 instead? Seems like a lot of work, and now a bunch more dependencies and hacks to rebuild this system when/if it dies, just to make a developer happy. Not saying this is bad... but maybe saying that core production systems should *try* to stay as simple as possible. And no, I don't always follow my own advice here. Just trying to get you to give us more info on your process here, since I think it's a good example of the balance we all have to try and achieve in our $WORK. John Eric> Thank you for your prompt replies! Karl, the iuscommunity repo is exactly Eric> what I needed. Also, it has some other packages that I've had to install Eric> directly so this is even better! thanks guys, see you next meeting. Eric> On Thu, Jun 27, 2013 at 10:03 AM, Karl Hiramoto <karl(a)hiramoto.org> wrote: >> On 06/27/2013 03:47 PM, Daniel J Walsh wrote: >> >> -----BEGIN PGP SIGNED MESSAGE----- >> Hash: SHA1 >> >> On 06/27/2013 09:34 AM, Eric Martin wrote: >> >> Hi All, >> >> The subversion server at my office is on a CentOS 6 server, and a software >> developer wrote a hook in python for it. The hook requires python 2.7, >> but CentOS 6 only has 2.6.6 (python-2.6.6-36.el6 to be exact). >> >> I grabbed python-2.7.2-5.2.fc16.src.rpm from Fedora 16 and am trying to >> roll my own via instructions I found on the CentOS wiki. All is good >> except that it requires db4.8, and that's not out for RHEL6 either. >> >> >From where I stand, it looks like my options are: 1) wait this out until >> either Python or a dependency are pushed up, but when is that? 2) rebuild >> this package with the deps, but I'm not quite sure how to roll a -devel >> package 3) roll my own package from scratch 4) install python 2.7 in an >> alternate location and point to it for this script >> >> Since this is a production server, I'd rather no do any hacks on this. >> Does anybody know how the release schedule works, or have any other >> advice? >> >> Thanks in advance, -- Eric Martin >> >> >> _______________________________________________ Wlug mailing list Wlug(a)mail.wlug.org http://mail.wlug.org/mailman/listinfo/wlug >> >> Look at Software Collections. Not sure if they have python2.7 yet though. >> https://access.redhat.com/site/documentation/en-US/Red_Hat_Developer_Toolse… >> >> >> Some SRPMS of python 2.7 >> >> http://dl.iuscommunity.org/pub/ius/stable/CentOS/6/SRPMS/repoview/ >> >> >> >> >> _______________________________________________ >> Wlug mailing list >> Wlug(a)mail.wlug.org >> http://mail.wlug.org/mailman/listinfo/wlug >> >> Eric> -- Eric> Eric Martin Eric> ---------------------------------------------------------------------- Eric> _______________________________________________ Eric> Wlug mailing list Eric> Wlug(a)mail.wlug.org Eric> http://mail.wlug.org/mailman/listinfo/wlug

June 30, 2013

Re: Looking for advice for home server

by Tim Keller

Kevin, It's been our experience that hosting your own email server on a consumer ISP is a nightmare. Because of the spam and bots many companies (mine included) simply drop mail from anything that remotely resolves to a consumer ISP IP. There are solutions around this. Amazon has a service (SES) that can front your mail server and will host your MX records. You'll still need to handle a tremendous amount of spam filtering, etc. When you say FTP server I presume you mean SFTP? As for a NAS, you might be interested in something like FreeNAS Scale. It's linux based, it'll run on *anything. *It handles the whole ZFS setup and configuration of services, etc. It also very clearly supports docker and has a nice interface for installing applications. So you can very easily install something like Min.io and now your NAS has S3 bucket capabilities. For security, you might want to think about setting up something like tailscale so you won't have to knock (too many) holes in your firewall to handle the incoming traffic devices and the NAS will be on a private WAN. Tim. On Sat, Aug 3, 2024 at 4:09 PM Kevin Stratton via WLUG <wlug(a)lists.wlug.org> wrote: > I am looking for a cheap solution for the following: > > 1) Email server/redireector. I want to have a full custom domain and > email addre0ss. > > 2) FTP server on the same domain as the email server. > > 3) GUI setup preferred, I do not want to invest the time (right now) to > get this working as a 'ground up' > > project. > > 4) Total bandwidth needs should be negligible. > > > How would you approach this? > > At a very high level, I am considering: > > 1) Dedicating a DDR3 (RAM) era Intel I3 P.C. (sorry, I don not know the > generation) and installing NAS software with the appropriate docker > plugins, if they exist. I do not know if this is even reasonable. > Suggestions are appreciated. I am using a home ISP account. I am aware > of DynDNS type services to get around the lack of a static IP. I do not > currently plan on using this device as an actual NAS due to security > concerns. If necessary, I will use sneaker-net to transfer data, > although I am thinking about ssh or even RS232. > > 2) Renting out space on a service like Amazon Web services. Maybe they > have an image that is already what I want. > > Any ideas/thoughts/experiences would be appreciated. I hope to be at > the meeting next Thursday. > > > > > > > > > > > > > > > > > _______________________________________________ > WLUG mailing list -- wlug(a)lists.wlug.org > To unsubscribe send an email to wlug-leave(a)lists.wlug.org > Create Account: https://wlug.mailman3.com/accounts/signup/ > Change Settings: > https://wlug.mailman3.com/postorius/lists/wlug.lists.wlug.org/ > Web Forum/Archive: > https://wlug.mailman3.com/hyperkitty/list/wlug@lists.wlug.org/message/4MMUM… > -- I am leery of the allegiances of any politician who refers to their constituents as "consumers".

Aug. 4, 2024

Re: [Wlug] Flat screen monitor 19" needs fixit; free to good home

by E Johnson

Hi Jeff On Jun 28, 2015 12:29 AM, "JeffA Maillists" <jeffa.maillists(a)gmail.com> wrote: > > Hi Liz, > > If nobody else has chimed in, I'll take it. I've fixed a handful of LCDs with capacitor issues, and they're all still in use today. > > I'll use it as a 'preview' monitor at church if I can fix it. ;-) > > Let me know, Thanks! > > Jeff > > On Sat, Jun 27, 2015 at 9:58 PM, E Johnson <iris.gates(a)gmail.com> wrote: >> >> The power went out here twice today. After the second event, monitor seems to have died. >> >> This is an Acer monitor, several years old. Black(ish) bezel; not glossy. Flat screen, I think 19" diagonal. Has been a very nice reliable monitor during its working life. Has choice of DVI input or the older kind of data connection, whatever that used to be. >> >> This specific batch of Acer monitors had used a type of capacitor which is known to have a higher-than-usual failure rate, and this is PROBABLY what it needs. Had a twin of this that fryolated same way 2 years ago, and a WLUG member came by & reported shortly after that he got it up & running with just the replacement of bad caps. >> >> This monitor has been very steady and reliable until this afternoon, with nice display and no dead pixels, ever. So if you are handy with electronics fixits, capacitors are cheap and you could probably get this working again with only a screwdriver, a soldering iron and a little bit of fiddling. Might be nice for the kid's playroom or the back office, or something. >> >> I don't know how nice games look on this monitor, since I don't do gaming. Videos always looked perfectly fine with good color. >> >> PM me if you think you want this, since I have to get down under the work table to unplug the power cord & I'm not as spry as I used to be, but can do as long as my knees aren't required to do anything radical before Noon. Pickup after Noon any day, & evenings even sort-of late-ish are okay. I can meet you at the door with this. I'm in Worcester near Elm Park. >> >> Rather give this away here than trash it, or Freecycle... first dibs to WLUG. >> >> Best wishes, >> Liz J >> >> _______________________________________________ >> Wlug mailing list >> Wlug(a)mail.wlug.org >> http://mail.wlug.org/mailman/listinfo/wlug >> > > > _______________________________________________ > Wlug mailing list > Wlug(a)mail.wlug.org > http://mail.wlug.org/mailman/listinfo/wlug > Hi Jeff power is out here AGAiN tonight --they think back on 3-am --so I have to use this tablet thing but yes nobody has yet desired this monitor and we would be glad if you want to try repairing it. Email me direct please iris.gates(a)gmail.com for pickup time. thanks, Liz j sorry for typos

June 28, 2015

Re: I need advice on a new ISP

by Althea Shaheen

Oracle cloud has been awesome for me for well over a year now. They provide quite a lot for free and are very good about not letting you enable things that are not free by accident. I just make sure to have good backups of my data there, in case they decide to take it away, but that's good advice with anything really :) On Thu, Apr 13, 2023, at 08:33, Chuck Anderson via WLUG wrote: > I would give a talk on how to set up Oracle Cloud manually--no Ansible > or other automation. > > On Thu, Apr 13, 2023 at 07:59:14AM -0400, Doug Mildram via WLUG wrote: >> Doug/dmildram> The free Oracle cloud >> setup talk sounds awesome. >> >> I'd expect it would take quite some time, >> both for presenter to prepare AND >> maybe even for the meeting timeframe. >> John, I think I may get as well try to >> not learn what Ansible is >> (being less into code control, node >> automation, myself... >> though I've seen an amazing amount >> of interest on them on this group, >> then pondered how we balance the >> various knowledge/skill levels in wlug). >> >> Am I right to assume that for a one-off, >> i.e. one personal/home user wanting >> free cloud storage and maybe email, >> that the Ansible angle should >> be postponed to follow >> a dumber/simpler?? How To talk? >> >> --Background just to expose my mind: >> I was a unix sysadin for decades >> since 1985, but my modern skills got >> out of date around 2000. Fortunately >> for me, I lucked into working with >> Chuck,Frank, many others as a WPI >> network engineer 2010-2019. Thus, >> not a sysadmin any longer but just a >> cubicle wall away from all kinds of >> IT evolution via WPI. Heck, even the >> WPI IT sysadmins leaned a bit?more? >> on the brains in NetOps ! --love, doug >> >> On Wed, Apr 12, 2023, 10:24 PM Chuck Anderson via WLUG <wlug(a)lists.wlug.org> >> wrote: >> >> > On Wed, Apr 12, 2023 at 05:14:31PM -0400, John Stoffel wrote: >> > > > If you can hold your nose, Oracle Cloud offers free forever instances. >> > > > That is where the WLUG website and DNS server is running these days. >> > > >> > > > https://www.oracle.com/cloud/free/ >> > > >> > > > These are probablhy the most relevant free services you could use to >> > > > replicate what you have at home now: >> > > >> > > And what's the price? >> > >> > Free forever. > _______________________________________________ > WLUG mailing list -- wlug(a)lists.wlug.org > To unsubscribe send an email to wlug-leave(a)lists.wlug.org > Create Account: https://wlug.mailman3.com/accounts/signup/ > Change Settings: > https://wlug.mailman3.com/postorius/lists/wlug.lists.wlug.org/ > Web Forum/Archive: > https://wlug.mailman3.com/hyperkitty/list/wlug@lists.wlug.org/message/XTNSW…

April 13, 2023

Re: [Wlug] non-Linux: Looking for a free kitten locally

by Jamie Guinan

Lol, you're right! And I commend you on your keen eyesight. :) -Jamie On Wed, 12 Aug 2009, Randall Mason wrote: > I feel all betrayed, it says Linux on the bottom, but it's clearley > FreeBSD... > Just kidding about the betrayal, it's more just sadness :-) > > Randall Mason > randall(a)mason.ch > > > On Wed, Aug 12, 2009 at 3:45 PM, Jamie Guinan <guinan(a)bluebutton.com> wrote: > > > > > And just to keep this on topic, here's a picture of a cat and > > Linux: > > > > http://countenance.files.wordpress.com/2009/04/linux-cat.jpg > > > > -Jamie > > > > > > On Wed, 12 Aug 2009, Jamie Guinan wrote: > > > > > > > > I suspect the amount you would pay at the animal shelter would PALE > > > next to what you are going to pay for vet bills, spaying/neutering > > > (usually done around 6 mos as I recall), food, etc. So despite your > > > comment, I'll plug these guys: > > > > > > http://www.worcester-arl.org/catsAdoption.html > > > > > > But for another source, people are giving away kittens all the time > > > on Worcester freecycle. Its a Yahoo groups thing, which totally > > > sucks balls, but I have found good stuff on there from time to time. > > > > > > http://groups.yahoo.com/group/WorcesterMAfreecycle/ > > > > > > Example: > > > > > > Wed Jul 29, 2009 4:50 pm > > > offer: young grey kitten with white paws 01604 > > > > > > -Jamie > > > > > > > > > On Wed, 12 Aug 2009, Tatsh wrote: > > > > > > > I know I have not ever sent an email, but I've been on the mailing list > > > > for some time. Been extremely interested in going to meetings but just > > > > have not done so yet. > > > > > > > > If you are local, and have healthy kittens to give away or know anyone > > > > who does locally (I live in Lancaster, about 20 minutes away from > > > > Worcester), please respond. Looking to just get one, at maximum 5 > > months > > > > old. > > > > > > > > I have been scouring the web and craigslist and have not found much. I > > > > do not really want to drop the amount they want at the local animal > > shelter. > > > > > > > > Any help appreciated. > > > > > > > > Thanks > > > > Andrew > > > > 978-870-5908 > > > > _______________________________________________ > > > > Wlug mailing list > > > > Wlug(a)mail.wlug.org > > > > http://mail.wlug.org/mailman/listinfo/wlug > > > > > > > > > _______________________________________________ > > Wlug mailing list > > Wlug(a)mail.wlug.org > > http://mail.wlug.org/mailman/listinfo/wlug > > >

Aug. 12, 2009

Re: [Wlug] linux networking question (reformatted for readability)

by Frank Sweetser

This is just a rough guess, but did you ever check on the state tables in your openbsd firewall? In your setup you have state distributed amongst your clients, your firewall, and you NAT gateway, and unless all three are in sync you can easily get the kind of possessed network behavior you describe. On February 7, 2015 3:20:15 PM EST, Brad <bkn(a)ithryn.net> wrote: >(i appologize for the previous message that i completely unreadable.) > >Dear W-LUGgers, > >I had some strange network related behavior that left me baffled and i >wanted >to hear some theories from more experienced network admins. > >The network layout is the following. The network is pretty simple, >external >traffic passes through a bridged-firewall (OpenBSD, my choice) into an >OS X >server (not my choice) which handles NAT/DHCP/DNS et al., and all the >office >computers are dhcp clients to the OS X server. The trouble machines are >linux >(ubuntu) desktop clients. > >The scenario is the following. I was doing work on the bridged firewall >(OpenBSD) and somehow caused it to kernel panic, oopsie! So the >bridged-firewall went down thus no-one had internet access, Dou! i >quickly >bounced the machine. It came back on-line and clients were able to >access the >internet, huzzah! But, the strange behavior was in two linux machines >within >the network that were not able to access some external IPs. My linux >desktop >could not access 8.8.8.8, when pinging, i could see an arp who-has >request >originating from my machine, i could see the packet come into the OS X >server. >But the request always went unanswered. The same behavior happened to >another >linux desktop but with 192.48.178.134 (sgi.com) My desktop could ping >sgi.com. >So each linux desktop had *different* unreachable IPs. The rest of the >internet >was reachable. I tried clearing the arp-cache on the OS X server, then >clearing >the NAT state tables, then I rebooted the OS X server, none solved the >problem. >I finally renewed the dhcp lease on my linux desktop machine and that >allowed >the ping to complete. > >What would case this behavior? Could it be stale arp-cache on the linux >machine? ( I *should* have tried to clear the arp-cache on the linux >machine >before i renewed the dhcp lease, but i didn’t think of that until after >the >fact.) The linux machine was sending out arp who-has requests so would >a stale >cache even matter? Why would no one answer the arp requests? I am not >an expert >network admin (its just a side job since the company is only 15 >people). I >don’t expect to get a resolution but i’m interested to hear any >theories. > >Thanks and cheers, — brad > >PS. As a worcester transplant to boston, i am really jealous i don’t >live >closer to attend meetings. The topics of late sound outstanding. > >_______________________________________________ >Wlug mailing list >Wlug(a)mail.wlug.org >http://mail.wlug.org/mailman/listinfo/wlug -- Sent from my Android device with K-9 Mail. Please excuse my brevity.

Feb. 7, 2015

Re: Hierarchical note taking, Joplin, Trilium, browser extensions, etc..

by John Stoffel

>>>>> "Tim" == Tim Keller via WLUG <wlug(a)lists.wlug.org> writes: > Sadly no. I've looked at DokuWiki a couple of times. I've *run* dokuwiki and mediawiki for $WORK a couple of times... but never used them in anger either. > The problem is this. I'm lazy. The lowest barrier to entry is simply > a directory called "Notes" with a bunch of text files. Being text > and using a unix-like system, I've got tools like grep to find > stuff. Me too, I have *tons* of files will all kinds of notes and ideas. Works great from a GUI login, and also works from an SSH text only connection as well. > I figure the next lowest thing is some program that lets me take > notes that I can then organize into some index and search against it > as well. Beyond that now it becomes hosted somewhere, etc. I keep wanting to learn 'org-mode' in emacs. But I never get there. What I do use is a little header lines in emacs and a setup where it updates the date whenver I save the file. This way I know when I last edited the file (inside emacs at least) which is a great way to keep on top of things. I'd be happy to share with what I do in emacs. John > On Fri, May 17, 2024 at 10:35 AM Mike Peckar <mpeckar(a)gmail.com> wrote: > Hey Tim, > I might have missed it, but I'm curious if you came to any conclusions about these tools. > thanks, > Mike > On Fri, Aug 11, 2023 at 9:31 PM Tim Keller via WLUG <wlug(a)lists.wlug.org> wrote: > At last night's meeting, a new attendee brought up a problem she was having and one of the > solutions that got bandied about was Joplin. > After doing some research, this might be my new note taking app. > Another very interesting FOSS tool out there is called "Trilium" > https://github.com/zadam/trilium > As much as I like google's keep.. I'm fully aware that google capable of just pulling the > rug out from under me in a moment's notice. > I've spun up U22.04.3 server and I'm going to tinker with Joplin and possibly Trilium and > let people know what I think of them. > Tim. > -- > I am leery of the allegiances of any politician who refers to their constituents as > "consumers". > _______________________________________________ > WLUG mailing list -- wlug(a)lists.wlug.org > To unsubscribe send an email to wlug-leave(a)lists.wlug.org > Create Account: https://wlug.mailman3.com/accounts/signup/ > Change Settings: https://wlug.mailman3.com/postorius/lists/wlug.lists.wlug.org/ > Web Forum/Archive: > https://wlug.mailman3.com/hyperkitty/list/wlug@lists.wlug.org/message/UDTAP… > -- > I am leery of the allegiances of any politician who refers to their constituents as "consumers". > _______________________________________________ > WLUG mailing list -- wlug(a)lists.wlug.org > To unsubscribe send an email to wlug-leave(a)lists.wlug.org > Create Account: https://wlug.mailman3.com/accounts/signup/ > Change Settings: https://wlug.mailman3.com/postorius/lists/wlug.lists.wlug.org/ > Web Forum/Archive: https://wlug.mailman3.com/hyperkitty/list/wlug@lists.wlug.org/message/K6235…

May 21, 2024

Funky LVM hack we talked about...

by Tim Keller

Hey Gang, For those of you at the meeting who don't remember, Kevin had a 32GB flash disk that had a controller that had a built in understanding of FAT32. Thus formatting it as any other file system would work until you actually wrote to it then it would go insane. I postulated that one way to solve this would be to use LVM or MD, however when we tried this I hit a road block in that pvcreate won't let you pvcreate a regular old file, you need a device file, the same thing with MD. I finally managed to get it to work without having to hand add any devices into /dev... here's how... For my testing I created 4 100MB files using the command: dd if=/dev/zero of=part[1-4] bs=1024k count=100 This is what Kevin would need to do to on his flash drive... 1. Create 16, 2GB files on the flash drive named part[1-16] 2. Create loopback to file mappings using the command "losetup /dev/loop1 part1", repeat for all devices Also note, with this you could setup loopback encryption on these devices... If you suddenly find yourself without a loopback device issue the command in /dev "./MAKEDEV loop" However, I think udev will probably take care of it behind the scenes. 3. pvcreate /dev/loop1 /dev/loop2 /dev/loop3 /dev/loop4 ... 4. vgcreate vgHACK /dev/loop1 /dev/loop2 /dev/loop3 /dev/loop4 ... At this point if you issue a "vgdisplay" you should see how many (PE) physical extents you have. 5. lvcreate -n volume_name -l num_of_extends vgHACK If you use -L you can specify 300M, etc. Also you can specify how many stripes you want the data to be written in, which is handy if your 16 devices were on seperate disk controllers... Also you don't have to use all the extends in one logical volume, you could create lots of little volumes. 6. mkfs.ext3 /dev/vgHACK/volume_name 7. mount filesystem, sit back in bemusement that linux gives you the flexibility to do such things. Now... while were at it, if instead of LVM, if you wanted to use MD, this is what you'd do. If you have the lvm stuff from above, unmount the filesystem and issue a vgremove vgHACK it'll warn about active volumes, blah, blah... This command will take loop1,loop2,loop3,loop4 and put them into a 4 member RAID0 with no spare. mdadm -C /dev/md0 -l 0 -n 4 /dev/loop1 /dev/loop2 /dev/loop3 /dev/loop4 This command will create a raid5 out of the four devices without a spare. mdadm -C /dev/md0 -l 0 -n 4 /dev/loop1 /dev/loop2 /dev/loop3 /dev/loop4 It'll go off and build the array, now just format and mount and you're set to go. cat /proc/mdstat to see what it's upto. I was thinking of other insane things that Kevin can do with his 3 32GB flash disks. He could create 3 logical volumes each containing 16 members and then create an raid5 MD device using the logical volume members... He could create 3 16 member raid0's and then create a raid 5 out of them. He could install ZFS on top of fuse and then put all 48 devices into a zpool... I'll stop here, but I'm sure others have some even demented/funny ideas... Enjoy! Tim. -- I am weary of the allegiances of any politician who refers to their constituents as "consumers".

Sept. 18, 2008

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