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Hardware for kids
by Russell Coker 30 Aug '16

30 Aug '16

I've been collecting hardware for Wooranna Park Primary (which runs a Coder Dojo as described in a LUV lecture last year). They are after things that the kids can fix up and learn from. PCs and Laptops that they can install Linux on and random hardware they can play with. If you have stuff that may be suitable and can bring it to a LUV meeting let me know off list. -- Sent from my Nexus 6P with K-9 Mail.

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Compose Melbourne, functional-programming conference + unconference, Monday, Tuesday
by Les Kitchen (LUV) 27 Aug '16

27 Aug '16

We're running a functional-programming event, Compose Melbourne, on Monday and Tuesday this coming week at RMIT in the City: http://www.composeconference.org/ Since it's a local, community-based technical event, and there are strong links between functional programming and FOSS, I thought it might be of interest to LUV members. Day 1, Monday, is a conference with speakers and paid registration. Day 2, Tuesday, we'll be running free workshops, including one on Haskell for Beginners. While the workshops are free, you still need to register, and possibly install software on your laptop ahead of time. More generally, Tuesday is a free unconference, a chance for people to get together informally and share their interest in functional programming. So, if you'd like to learn more about functional programming, and meet people also interested in functional programming, then come along to Compose Melbourne. Sorry for short notice on this. — Smiles, Les.

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Happy 25th birthday Linux!
by Andrew Pam 25 Aug '16

25 Aug '16

"On August 25, 1991, an obscure student in Finland named Linus Benedict Torvalds posted a message to the comp.os.minix Usenet newsgroup saying that he was working on a free operating system as a project to learn about the x86 architecture. He cannot possibly have known that he was launching a project that would change the computing industry in fundamental ways. Twenty-five years later, it is fair to say that none of us foresaw where Linux would go — a lesson that should be taken to heart when trying to imagine where it might go from here." https://lwn.net/SubscriberLink/698042/a58a7e353224ef3d/ And thanks to LWN.net for their consistently excellent coverage. Share and enjoy, Andrew

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Cheap Home Cloud ~ Raspberry Pi + USB Drives
by Piers Rowan 21 Aug '16

21 Aug '16

Friday random semi-serious question; Like many people I have too much data some work, some create some family, some other...etc. I have some on some backup USB drives that I have never gone back to and also a few unplugged HDD's in the tower (I can't remember even why). I don't really want to go and buy something (or pay for data of cloud storage) but I thought I might do something with the stuff I have lying around. Does anyone know if this is possible: - Set up a Raspberry Pi server which exposes a single file system - Link it to the USB HDD's of different sizes that I have lying around - I save my data to it for backups - The data is placed redundantly over the drives so it can recover from one [or more] dying Bonus point: - I can remove one of the drives and access the data on it directly (so it is FAT32 not Linux RAID) Any ideas? GFS? Cheers P

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MySQL - JOIN's, INDEX's and/vs seperate quiries
by Piers Rowan 20 Aug '16

20 Aug '16

Hi There, I am working on a query that I have used both joins and sub queries to try to make into something efficient. I have used the EXPLAIN command to make sure I am taking advantage of indexes and I have added them where they are lacking. The structure of the query looks like this: People_table <--- where the rows I want to show on the screen come from (name, address, etc) - Notes <--- One Person may have many notes, using date range search, also using INT search, and this is using FULLTEXT IN BOOLEAN MODE searching - Profile <--- This is a single text column, this is using FULLTEXT IN BOOLEAN MODE searching - People <--- Filtering by state, country, status, other ENUM / INT flags I have tried (JOINS): SELECT FROM People JOIN Notes JOIN Profile WHERE People Criteria AND Notes Criteria AND Profile Criteria And tried (SUB QUERIES) SELECT FROM People WHERE People.id IN (SELECT P.id FROM NOTES WHERE Notes Criteria AND Pid IN (SELECT P.id FROM Profile WHERE Profile Criteria AND P.id IN (SELECT P.id FROM People WHERE People Criteria) So far I have killed the process after a few minutes as it just takes too long. I noticed temporary tables were being created so I enlarge the join buffer pool in my.cnf which cleared some of the feedback from the EXPLAIN. (...and tried a few others...). Then there is this: - I can do the 3 queries in PHP independently and then use this to get a list of ID's at the application layer to send a 4th query to get the results and it only takes a few seconds. A FEW SECONDS! Questions: - My gut tells me that this should be most efficiently handled at the application layer - How can 3 sub queries take more time than 3 independent queries? - The "People Criteria" is all ENUMS and INT's which are indexed - I though by making this the inner most subquery that it would filter out the most rows before the slower FULLTEXT queries kicked in - is this correct? - JOINS vs SUBQUERIES - is there are "rule"? Does this "rule" get pushed aside when real world testing proves the user experience at the application layer is better by combining multiple SQL quires as opposed to handing it off to the MySQL server? Ideas? Thanks in advance. Cheers P

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old SATA disks
by Russell Coker 19 Aug '16

19 Aug '16

There seems to be an ongoing demand for SATA disks from the hardware library. Does anyone have any to donate? Even 80G disks get taken. -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/

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test messsage
by zlinw＠mcmedia.com.au 18 Aug '16

18 Aug '16

I have not been able to post to luv-main for quite some time. I have tried a number of things, this is just a test message to see if the situation still exists. Lindsay

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M.2 and SSD
by Russell Coker 15 Aug '16

15 Aug '16

https://etbe.coker.com.au/2016/08/14/ssd-m2/ I've just written a blog post that covers similar things to my talk about M.2 and SSD. Apparently someone asked for my lecture notes, that wouldn't be useful but the above post probably will be. -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/

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Re: Security and the "better than nothing" trap
by trentbuck＠gmail.com 13 Aug '16

13 Aug '16

[Sent last week, but got eaten due to gmane DOS attacks confusing luv.asn.au MTA.] trentbuck(a)gmail.com (Trent W. Buck) writes: > Peter Ross via luv-main writes: >> Should SELinux be reworked so that disarming is not possible? > > Linux watchdog drivers can behave this way ("nowayout=1"). > I looked for a similar option for selinux, but all I found was: > http://stopdisablingselinux.com/

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Linux TCP security flaw?
by Erik Christiansen 13 Aug '16

13 Aug '16

Reading this: https://ucrtoday.ucr.edu/39030 which is doing the rounds on some lists, I checked: https://www.cert.gov.au/advisories but that seems to be unmaintained. There is however, no mention of a new TCP vulnerability at: https://www.us-cert.gov/ncas/current-activity https://www.us-cert.gov/ncas/alerts https://www.auscert.org.au/render.html?cid=1 Is the article perhaps a furphy? Erik

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