- WLUG - wlug.mailman3.com

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

Re: [Wlug] REMINDER: Upcoming Meeting on Wednesday

by E Johnson

Rich, > I'd be happy to see someone re-do the GIMP presentation. I really > wanted to see that, but I just couldn't make it. :-) I did the GIMP gig last time. I'll be there, & will bring the laptop again in case you want to see it. It wasn't that big of a presentation, but I could demo it again. I have questions about Hardy, but probably none that woiuld take very long to answer. Liz J

Sept. 16, 2008

Re: [Wlug] REMINDER: Upcoming Meeting on Wednesday

by Richard Klein

On Mon, Sep 15, 2008 at 8:24 PM, Andy Stewart <andystewart(a)comcast.net> wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > > HI gang, > > The next WLUG meeting will be on Wednesday, September 17th, 2008, at > 7:00 PM in the Access Grid Room at WPI in Worcester, MA USA. > > Currently, we don't have a speaker for the meeting, but if anybody > wishes to volunteer, please send me email. I'd be happy to see someone re-do the GIMP presentation. I really wanted to see that, but I just couldn't make it. :-) -- Rich

Sept. 16, 2008

Re: [Wlug] REMINDER: Upcoming Meeting on Wednesday

by Robert Schwein

There's also a tremendous resource on the Suse distro over in Waltham; Novell. Just a thought. Bob Andy Stewart wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > Aaron Haviland wrote: > >> Just to bridge the gap... >> >> Andy, >> >> I'm copying this to the local Ubuntu Community (LoCo) Team >> (https://wiki.ubuntu.com/MassachusettsTeam) as although I can never make these >> meetings myself, I thought someone else there might be able to, and might be >> interested in demoing. It is short notice, though... >> >> Also, it might be interesting to compare with the latest beta of Intrepid (8.10) as >> that's due out next month, and I believe KDE's gone through a major change between >> the two releases. I'll let someone more knowledgeable speak to that... >> > > Hi Aaron, > > If a person from the local Ubuntu Community Team was interested in > attending a WLUG meeting, I'd happily entertain that idea. Please ask > that person to contact me directly and we can work out the logistics for > this, or any future, WLUG meeting. > > Thanks! > > Andy > > >> Andy Stewart wrote, on Sep 15, 2008 at 20:24 EDT: >> >>> HI gang, >>> >>> The next WLUG meeting will be on Wednesday, September 17th, 2008, at >>> 7:00 PM in the Access Grid Room at WPI in Worcester, MA USA. >>> >>> Currently, we don't have a speaker for the meeting, but if anybody >>> wishes to volunteer, please send me email. >>> >>> I'd be curious to see a demo of (K)Ubuntu Hardy 8.04 if anybody has one >>> available. >>> >>> See ya there! >>> >>> Andy >>> >>> -- >>> Andy Stewart, Founder >>> Worcester Linux Users' Group (http://www.wlug.org) >>> Chelmsford Linux Meetup Group (http://linux.meetup.com/393) >>> Amateur Radio: KB1OIQ >>> _______________________________________________ >>> 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 >> > > > - -- > Andy Stewart, Founder > Worcester Linux Users' Group (http://www.wlug.org) > Chelmsford Linux Meetup Group (http://linux.meetup.com/393) > Amateur Radio: KB1OIQ > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.4.2 (GNU/Linux) > Comment: Using GnuPG with SUSE - http://enigmail.mozdev.org > > iD8DBQFIz5G2Hl0iXDssISsRAo5OAJ9kGeEn1t9mSQEf+rwnkniAvc9SmgCfWaes > E5HqrfpNiW4UHSeeL5ekldU= > =3UlJ > -----END PGP SIGNATURE----- > _______________________________________________ > Wlug mailing list > Wlug(a)mail.wlug.org > http://mail.wlug.org/mailman/listinfo/wlug > >

Sept. 16, 2008

Re: [Wlug] REMINDER: Upcoming Meeting on Wednesday

by Andy Stewart

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Aaron Haviland wrote: > Just to bridge the gap... > > Andy, > > I'm copying this to the local Ubuntu Community (LoCo) Team > (https://wiki.ubuntu.com/MassachusettsTeam) as although I can never make these > meetings myself, I thought someone else there might be able to, and might be > interested in demoing. It is short notice, though... > > Also, it might be interesting to compare with the latest beta of Intrepid (8.10) as > that's due out next month, and I believe KDE's gone through a major change between > the two releases. I'll let someone more knowledgeable speak to that... Hi Aaron, If a person from the local Ubuntu Community Team was interested in attending a WLUG meeting, I'd happily entertain that idea. Please ask that person to contact me directly and we can work out the logistics for this, or any future, WLUG meeting. Thanks! Andy > > Andy Stewart wrote, on Sep 15, 2008 at 20:24 EDT: >> HI gang, >> >> The next WLUG meeting will be on Wednesday, September 17th, 2008, at >> 7:00 PM in the Access Grid Room at WPI in Worcester, MA USA. >> >> Currently, we don't have a speaker for the meeting, but if anybody >> wishes to volunteer, please send me email. >> >> I'd be curious to see a demo of (K)Ubuntu Hardy 8.04 if anybody has one >> available. >> >> See ya there! >> >> Andy >> >> -- >> Andy Stewart, Founder >> Worcester Linux Users' Group (http://www.wlug.org) >> Chelmsford Linux Meetup Group (http://linux.meetup.com/393) >> Amateur Radio: KB1OIQ >> _______________________________________________ >> 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 - -- Andy Stewart, Founder Worcester Linux Users' Group (http://www.wlug.org) Chelmsford Linux Meetup Group (http://linux.meetup.com/393) Amateur Radio: KB1OIQ -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2 (GNU/Linux) Comment: Using GnuPG with SUSE - http://enigmail.mozdev.org iD8DBQFIz5G2Hl0iXDssISsRAo5OAJ9kGeEn1t9mSQEf+rwnkniAvc9SmgCfWaes E5HqrfpNiW4UHSeeL5ekldU= =3UlJ -----END PGP SIGNATURE-----

Sept. 16, 2008

Re: [Wlug] Fwd: REMINDER: Upcoming Meeting on Wednesday

by Andy Stewart

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 James Gray wrote: > Did you mean 8.04 or 8.10? There are already alphas available for > 8.10. I would kind of like to see a demo of the features in this > next release. HI James, I actually did not know about version 8.10 until you mentioned it. A demo of the features of this release would be interesting IMHO. Later, Andy > > > ---------- Forwarded message ---------- > From: Andy Stewart <andystewart(a)comcast.net> > Date: Mon, Sep 15, 2008 at 8:24 PM > Subject: [Wlug] REMINDER: Upcoming Meeting on Wednesday > To: Worcester Linux Users Group <wlug(a)mail.wlug.org> > > > > HI gang, > > The next WLUG meeting will be on Wednesday, September 17th, 2008, at > 7:00 PM in the Access Grid Room at WPI in Worcester, MA USA. > > Currently, we don't have a speaker for the meeting, but if anybody > wishes to volunteer, please send me email. > > I'd be curious to see a demo of (K)Ubuntu Hardy 8.04 if anybody has one > available. > > See ya there! > > Andy > _______________________________________________ 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 - -- Andy Stewart, Founder Worcester Linux Users' Group (http://www.wlug.org) Chelmsford Linux Meetup Group (http://linux.meetup.com/393) Amateur Radio: KB1OIQ -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2 (GNU/Linux) Comment: Using GnuPG with SUSE - http://enigmail.mozdev.org iD8DBQFIz4/HHl0iXDssISsRAgwfAJ4nlZyoMPeYw+J8PlsKQua4cqk+MgCeP80v gptU4XgYqfhs6Jufw6QVJPA= =z3RF -----END PGP SIGNATURE-----

Sept. 16, 2008

Fwd: REMINDER: Upcoming Meeting on Wednesday

by James Gray

Did you mean 8.04 or 8.10? There are already alphas available for 8.10. I would kind of like to see a demo of the features in this next release. ---------- Forwarded message ---------- From: Andy Stewart <andystewart(a)comcast.net> Date: Mon, Sep 15, 2008 at 8:24 PM Subject: [Wlug] REMINDER: Upcoming Meeting on Wednesday To: Worcester Linux Users Group <wlug(a)mail.wlug.org> -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 HI gang, The next WLUG meeting will be on Wednesday, September 17th, 2008, at 7:00 PM in the Access Grid Room at WPI in Worcester, MA USA. Currently, we don't have a speaker for the meeting, but if anybody wishes to volunteer, please send me email. I'd be curious to see a demo of (K)Ubuntu Hardy 8.04 if anybody has one available. See ya there! Andy - -- Andy Stewart, Founder Worcester Linux Users' Group (http://www.wlug.org) Chelmsford Linux Meetup Group (http://linux.meetup.com/393) Amateur Radio: KB1OIQ -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2 (GNU/Linux) Comment: Using GnuPG with SUSE - http://enigmail.mozdev.org iD8DBQFIzvzSHl0iXDssISsRAqL0AJ0cF3oe5XDFH43fL5MAfApRVTzrHgCfQmRF +rJjaZcg8at52lND2aPVENY= =EKXD -----END PGP SIGNATURE----- _______________________________________________ Wlug mailing list Wlug(a)mail.wlug.org http://mail.wlug.org/mailman/listinfo/wlug

Sept. 16, 2008

Re: [Wlug] REMINDER: Upcoming Meeting on Wednesday

by Aaron Haviland

Just to bridge the gap... Andy, I'm copying this to the local Ubuntu Community (LoCo) Team (https://wiki.ubuntu.com/MassachusettsTeam) as although I can never make these meetings myself, I thought someone else there might be able to, and might be interested in demoing. It is short notice, though... Also, it might be interesting to compare with the latest beta of Intrepid (8.10) as that's due out next month, and I believe KDE's gone through a major change between the two releases. I'll let someone more knowledgeable speak to that... Andy Stewart wrote, on Sep 15, 2008 at 20:24 EDT: > > HI gang, > > The next WLUG meeting will be on Wednesday, September 17th, 2008, at > 7:00 PM in the Access Grid Room at WPI in Worcester, MA USA. > > Currently, we don't have a speaker for the meeting, but if anybody > wishes to volunteer, please send me email. > > I'd be curious to see a demo of (K)Ubuntu Hardy 8.04 if anybody has one > available. > > See ya there! > > Andy > > -- > Andy Stewart, Founder > Worcester Linux Users' Group (http://www.wlug.org) > Chelmsford Linux Meetup Group (http://linux.meetup.com/393) > Amateur Radio: KB1OIQ > _______________________________________________ > Wlug mailing list > Wlug(a)mail.wlug.org > http://mail.wlug.org/mailman/listinfo/wlug -- Aaron Haviland 34 Wayne Ave, Dudley, MA home: [508] 943 - 7974

Sept. 16, 2008

REMINDER: Upcoming Meeting on Wednesday

by Andy Stewart

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 HI gang, The next WLUG meeting will be on Wednesday, September 17th, 2008, at 7:00 PM in the Access Grid Room at WPI in Worcester, MA USA. Currently, we don't have a speaker for the meeting, but if anybody wishes to volunteer, please send me email. I'd be curious to see a demo of (K)Ubuntu Hardy 8.04 if anybody has one available. See ya there! Andy - -- Andy Stewart, Founder Worcester Linux Users' Group (http://www.wlug.org) Chelmsford Linux Meetup Group (http://linux.meetup.com/393) Amateur Radio: KB1OIQ -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2 (GNU/Linux) Comment: Using GnuPG with SUSE - http://enigmail.mozdev.org iD8DBQFIzvzSHl0iXDssISsRAqL0AJ0cF3oe5XDFH43fL5MAfApRVTzrHgCfQmRF +rJjaZcg8at52lND2aPVENY= =EKXD -----END PGP SIGNATURE-----

Sept. 16, 2008

(redhat,fedora)(LONG) yum.repos.d? for local-net base RPMs

by Doug Mildram

Hi! I had imperfect luck googling the best/easiest answer to this one. Maybe I just need a good "yum book/tutorial". I may have solved (poorly or OK) my "simulated challenge" (planning for an RHCE exam) which is: Let's say I had no Internet, but I did have RedHat RPM's on a local server, so doing a new-install with JUST the first boot cd, then linux askmethod (chose ftp/nfs/http, whatever the server's offering) And did the install using network'd RPMs. Later, say I wanna "yum install" something-else missed earlier, without manually pointing to RPMs. (keep using yum, without Internet). Out of the box, yum didnt adjust itself to my "askmethod" location. Tis on the RHCE exam prep list: "configure to update/install pkgs from remote repositories using yum or pup" I'll attempt (poorly,toomuch...) to finetune a more specific QUESTION: .....................How to modify the yum (config or yum.repos.d/files) IN ORDER TO: either REPLACE ( I managed this) or ADD TO (more intelligently) to use a local-network source for "base RPMs" (whatever comes on the .iso CD/DVD's , a likely RPM stash/set) Here's one answer that might be OK in the isolated situation: a) Comment OUT primary line in /etc/yum.repos.d/*file within [base] (ymmv, "baseurl" or "mirrorlist" line, look for comments/fallbacks) then b) add ONE LINE "baseurl=ftp:...", whatever the server's offering. I'll assume ==dumb to create a NEW /etc/yum.repos.d file with [base] or [??] Also assume there's better ways to solve this. ====== here's a comparison of a centOS 4 vs rhel 5 /etc/yum/repos.d : CentOS release 4.5 (Final) [doug]$ pwd /etc/yum.repos.d [doug]$ grep \\\[ * CentOS-Base.repo:[base] CentOS-Base.repo:[update] CentOS-Base.repo:[addons] CentOS-Base.repo:[extras] CentOS-Base.repo:[centosplus] CentOS-Base.repo:[contrib] CentOS-Media.repo:[c4-media] ==== centOS 5 looks the same as above/centOS4. but RHEL 5 is quite different in yum.repos.d below:=======RHEL 5 workstation: $ cat /etc/redhat-release Red Hat Enterprise Linux Client release 5.2 (Tikanga) [doug]$ ls /etc/yum.repos.d rhel-debuginfo.repo # ONLY ONE short FILE , # and it's ignored ("enabled=0") anyways. ## NOTE LACK OF visible [base], [updates], etc.... So there's some hidden magic here, neither in /etc/yum.conf. [doug]$ cat /etc/yum.repos.d/rhel-debuginfo.repo [rhel-debuginfo] name=Red Hat Enterprise Linux $releasever - $basearch - Debug baseurl=ftp://ftp.redhat.com/pub/redhat/linux/enterprise/$releasever/en/os/… enabled=0 gpgcheck=1 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release oops, too much info. Favorite yum pointer for this topic, or just advice welcome! thx -doug

Sept. 8, 2008