- luv-main - luv.asn.au

talk about hyper-threading
by Russell Coker 21 Mar '17

21 Mar '17

After a conversation at the beginners meeting I think it would be good to have a talk about hyper-threading and other features of modern CPUs. Would anyone like to give such a talk? It doesn't require detailed knowledge, just a good general knowledge about PC architecture and a little bit of research. It would be a beginner to intermediate talk. -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/

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node.js
by Andrew Pam 14 Mar '17

14 Mar '17

We've had a request for a beginners talk about programming with node.js. Are there any members who have used node and would be willing to talk about it? Please keep sending in suggestions for talks and other things you would like to do at our meetings! Thanks, Andrew

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Chrome notification pop-up location
by Toby Corkindale 10 Mar '17

10 Mar '17

I use Google Chrome, which supports letting websites send notifications as brief pop-ups on your screen. This works fine, except they always appear in the bottom-right corner of my right-hand monitor. I have two monitors, and the one on the right is kind of secondary, and the far right of it is out of my field of vision. Does anyone know how to control where notification pop-ups appear? I'm running KDE on Ubuntu 16.04. Cheers Toby

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rsync; how to preserve Windows permissions
by Bill Yang 09 Mar '17

09 Mar '17

Hi There, Thank you very much for all your comments and help with “rsync with multiple threads”. It was very helpful. I have found out that in my case, rsync with multiple threads did speed up a bit of file transfer process. This is the command I was using (run it with while loop, and define TARGET and THREADS in the script): find dir-name -maxdepth 1 -mindepth 1 -type d -print0 | xargs -n1 -0 -P$THREADS -I% rsync -a %/ $TARGET/% I now have another issue. Some of the files/directories I transferred from source storage server (Red Hat) are Windows files/directories (Those Windows files were backed up using a backup software). rsync didn’t preserve Windows permissions/ACLs when those files were transferred onto the target storage server (FreeBSD). Is there any way to instruct rsync to preserve Windows permissions/ACLs? Any suggestions would be appreciated. Thanks and Cheers, Bill

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DNS resolution weirdness whilst using OpenConnect
by Anthony 09 Mar '17

09 Mar '17

Sometimes, I have to use OpenConnect to connect into some VPNs (so much less nasty than the Cisco AnyConnect client for linux which insists on running a daemon in the background). Ubuntu 16.10 has it as a package I installed, and it connects fine. What goes screwy is DNS resolution... Sometimes, for no obvious reason, I can resolve internal hostnames that resolve to destinations reached by the host using things like the "host" command... ... but if I try to reach that same host via SSH using its hostname, it will say it can't resolve the host. I don't understand how the host command could behave differently to a program requesting DNS resolution? It had been a long time since I'd needed to fiddle with my resolv.conf, so I went to have a look, and was presented with some abhorrent mashup of dnsmasq, network managd and/or systemd and other things seemingly dynamically configuring stuff, but with no obvious way to figure out what the current settings were or how to influence them (insert rant here about the increasingly opaque way services are being configured in linux, with a decline in obvious CLI tools in lieu of monolith services that speak in tongues between themselves). OpenConnect uses the vpnc-scripts package to configure routing and name services. The routing seems to work ok, but I can't for the life of me figure out why DNS resolution would randomly not work across all apps... particularly the fact that within the same connection I can have DNS work and then not work again. Is dhclient perhaps overriding things when lease is up? Though that wouldn't explain why sometimes it fails off the bat. Anyone else use OpenConnect? Have you had it behave weirdly? I mean, I could just go through I guess and strip back a lot of the "magic" that happens... but as with systemd, I feel as much as I'm not a fan of some of it, I'd be fighting the tide and therefore not keeping up my knowledge of frequently used system components..

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Re: [luv-announce] LUV Main March 2017 Meeting: Multicore World / Patching with quilt
by Duncan Roe 06 Mar '17

06 Mar '17

On Mon, Feb 27, 2017 at 11:22:53PM +1100, luv-announce wrote: > *PLEASE NOTE NEW LOCATION* > > Tuesday, March 7, 2017 > 6:30 PM to 8:30 PM > Level 29, 570 Bourke St. Melbourne > > Speakers: > > ??? Lev Lafayette, MultiCore World 2017 Wellington > ??? Russell Coker, Patching with quilt > > > Lev Lafayette, Multicore World 2017 Wellington > ---------------------------------------------- > > Lev Lafayette is the HPC and Training Officer at the University of > Melbourne. Prior to that he worked at the Victorian Partnership for > Advanced Computing (VPAC) in a similar role for several years. Since > 2006 he has done a few things for LUV as well. > > > Russell Coker, Patching with quilt > ---------------------------------- > > Russell Coker has done lots of Linux development over the years, mostly > involved with Debian. > > > 570 Bourke St. Melbourne, between King and William streets > > Late arrivals needing access to the building and the twenty-ninth floor > please call 0490 627 326 or 0421 775 358. > > Before and/or after each meeting those who are interested are welcome to > join other members for dinner. We are open to suggestions for a good > place to eat near our venue. > > LUV would like to acknowledge Dell for their help in obtaining the venue. > [SNIP] According to the PTV web site, it's a 20 min walk to Maria's or 10 mins by (free) 55 tram (every 20 mins: we just get one if we happen to leave the building by 2030) Sounds fine to me, Cheers ... Duncan.

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meetings
by Russell Coker 26 Feb '17

26 Feb '17

As Andrew has noted we have been kicked out of our meeting room. We are actively looking for other options. If you know of a meeting room we can use for minimal cost (or ideally for free) then please let us know. If you know of a meeting room that's available at 6:30 on the 6th of March then let us know ASAP!!! Especially if it's not too far from the previous meeting room. If a company is only available to provide a venue for a single meeting then that's totally OK, anything to get us out of the current predicament. Andrew is actively investigating some possibilities right now. But we can't assume he will be successfull (espectially not for next month's meeting due to short notice). Also I can't comment on what he is persuing. Please send any tips for commercial organisations that might provide free or subsidised meeting space to the committee or Andrew. Such things can't be discussed on a public list. For future planning (IE April and beyond) I think we should at least consider more radical options. If we were to hold the main meeting on a weekend then the following 2 options would be available. Red Hat have generously sponsored our meeting venue for many years. I hope that they will continue doing so, but as they have paid the bills directly we have no idea of how much they paid and how much they are prepared to pay in future. So obviously a cheap venue would be preferred. http://www.melbourne.vic.gov.au/community/libraries/locations/Pages/locatio… The Library at the Dock is only open until 7PM on weeknights but is open 10-5 on Saturday and 12-5 on Sunday. Sunday had free parking last time I checked. http://www.melbourne.vic.gov.au/community/hubs-bookable-spaces/the- dock/library-at-the-dock/Pages/performance-space.aspx If LUV is a "not for profit organisation from within the City of Melbourne" then a nice room for 120 people costs $24.50 per hour which is probably a lot less than what Red Hat has been paying. http://www.melbourne.vic.gov.au/community/hubs-bookable-spaces/the- dock/library-at-the-dock/Pages/fees-for-bookable-spaces-library-dock.aspx The above lists all the available spaces at the library. From a quick scan the performance space seems most suitable and it's at least a good place to start the discussion. But if we do choose the library then another space might have some benefits. Also note that the library has a cafe downstairs. It's not cheap, but having a choice to buy slightly expensive food is better than having no choice. They also have extensive facilities that can be used for free before or after a meeting. http://www.melbourne.vic.gov.au/community/hubs-bookable-spaces/kathleen-sym… library-and-community-centre/pages/multi-purpose-room-1.aspx The Kathleen Syme library has a room seating 56 people "theater style" for $10.50 per hour for "Not-for-profit in CoM municipality". It's also not far from our previous meetings. -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/

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splitting a diff
by Russell Coker 23 Feb '17

23 Feb '17

I have a diff file that has changes to multiple source files that I want to split up for sending upstream. Is there a good tool for splitting this? The ideal would be something that takes a list of source files on the command line, and writes the diffs for them to one file and the diffs for everything else to another. -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/

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rsync with multiple threads
by Bill Yang 22 Feb '17

22 Feb '17

Hi there I need to transfer 200+ TB data from one storage server (Red Hat Linux based) to another (FreeBSD). I am planning to use rsync with multiple threads in a script. There are a number of suggestions on the Internet (find + xargs + rsync), but none of them worked well so far. I also need a reliable way to check whether all files/directories from the source server have been copied to the destination server. Any suggestions/help would be appreciated. Regards Bill

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LUV DNS
by Russell Coker 15 Feb '17

15 Feb '17

I recently had to changethe IP address of my main DNS server and forgot to update the LUV server to allow transferring the data. I discovered this when the cached zone data expired and my own mail server was unable to send mail to the LUV server and a mon alert was raised about the inability to send mail. I've fixed the problem and configured another mon alert on DNS zones that don't transfer. As we had 2 servers still operating correctly at all times users would not have noticed. -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/

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