- Roundtable - muug.ca

"sc" - helper script for systemctl
by Brian Lowe 13 Feb '19

13 Feb '19

Here's a helper script I wrote for systemctl to reduce the amount of typing you need to do to invoke common systemctl function. Put this script into /usr/bin or /usr/local/bin (in which case, you may need to add /usr/local/bin to root's PATH), then run 'sc --setup' to make the needed symlinks. #!/bin/bash ##--------------------------------------------------------------------------- ## # # Script: 'sc' - systemctl shortener # Author: Brian Lowe # Date: December 2015 # # 'sc' implements a series of shortcuts for the 'systemctl' command (and # one for 'journalctl') via a series of symlinks in /usr/local/bin: # # Symlink Runs # sc systemctl # scs systemclt start # scr systemclt restart # sck systemctl stop ('k' = 'kill') # scl systemctl reload ('l' = reLoad) # scq systemctl status ('q' = 'query') # sct systemctl status ('t' = 'sTaTus') # scj journalctl ('scj NAME' runs 'journalctl --catalog --unit=NAME') # sch (provides help for the 'sc' command) # ##--------------------------------------------------------------------------- ## # # Setup: # 1. Put this script into /usr/local/bin # 2. Run the 'sc --setup' to set up the symlinks # ##--------------------------------------------------------------------------- ## # BUUS: This script is part of Brian's Useful Utilities Set ##--------------------------------------------------------------------------- ## PROGRAM_TO_RUN='systemctl' COMMAND='' BASENAME="$(basename $0)" if [ $BASENAME = 'sc' -a "$1" = '--setup' ] then DIRNAME=$(dirname $0) [ "$DIRNAME" ] && cd $DIRNAME echo -n "Setting up:" awk '/^#[[:space:]]*sc[a-z][[:space:]]/{print $2}' sc | while read X do [ -L $X ] || (echo -n " $X,"; ln -s sc $X) done echo " done" exit fi case $BASENAME in scs) COMMAND='start';; sck) COMMAND='stop';; scr) COMMAND='restart';; scl) COMMAND='reload';; scq) COMMAND='status';; sct) COMMAND='status';; scj) PROGRAM_TO_RUN='journalctl';; sch) COMMAND='sc-show-help';; esac #--- Handle a 'help' command (-h, --help) if [ "$1" = '-h' -o "$1" = "--help" ] then if [ ! "$COMMAND" ] then echo "Running 'systemctl --help' -- run 'sch' for help on 'sc' itself" sleep 1 fi fi #--- Handle 'scj UNIT-NAME', where the user wants the journal for a given unit if [ "$PROGRAM_TO_RUN" = 'journalctl' -a "$1" -a "${1:0:1}" != '-' ] then COMMAND="--catalog --unit=$1" shift fi #--- Handle 'sc-show-help' (help for the 'sc command' if [ "$COMMAND" = 'sc-show-help' ] then awk ' /#[[:space:]]*sch/ { exit } /#[[:space:]]*[[:alnum:]]+:/ { sw = 1 } sw == 1 && /^#[[:space:]]*$/ { sw = 2 } sw == 2 { match($0, /^#\t(.*)/, a); print a[1] } ' $0 echo exit fi echo -n " >> $PROGRAM_TO_RUN $COMMAND"; [ "$1" ] && echo -n " $@"; echo exec $PROGRAM_TO_RUN $COMMAND "$@"

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a different systemd argument
by Adam Thompson 13 Feb '19

13 Feb '19

From one of the FreeBSD developers: https://www.youtube.com/watch?v=o_AIw9bGogo This is the updated version of his talk, and is more cogent and helpful than the first version, so just watch this one :-). -Adam P.S. I still don't agree with some of his fundamental assumptions, nor some of his conclusions, but some of what he says makes sense.

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d-port daisychains and ryzen ecc
by Trevor Cordes 13 Feb '19

13 Feb '19

For those not at the meeting tonight, I just wanted to give a quick report on some new-ish first-hand tech experience vis a vis Linux support. - Display-port daisychaining works with Linux (kernel must be fairly new), and at least the nvidia binary driver (not sure about nouveau, though the Intel onboard GPU FLOSS drivers are said to support it for sure). You'd also need a vidcard that is new-ish with a new enough dport spec. Probably any decent mid-range card in the last 3 years will do. - Final monitor in the chain doesn't need a pass-thru port and can be an older dport spec (probably 1.1+) - Works great with 2 x 2560x1440 LCDs, but 2 x 4k is probably beyond the bandwidth of current widely-available dport spec - Ryzen (1st and 2nd gen) supports ECC on (certain) normal desktop boards, like most Asrock ones. We used Asrock AB350-PRO4. edac-utils says it works. dmidecode hints it works, though with some weird output. memtest86 (latest version) says it works. rasdaemon says it works. It's rasdaemon that is the replacement for abandon-ware edac-utils. So there you have it, an option to get a "workstation" with ECC and at least 1 PCIe x16 (full lanes) slot. At about half the price of a Xeon setup, which is the only way to get ECC + x16 slot in Intel land with a real CPU. There are some Ryzen teething issues and bios+linux workarounds you have to do though, so it's not as painless as a Xeon would be. If anyone knows why dmidecode says this for ram widths, let me know: Error Correction Type: Multi-bit ECC Data Width: 64 bits Total Width: 128 bits (128 bits!!!!? should be 72)

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Helper BASH script for systemctl
by Brian Lowe 13 Feb '19

13 Feb '19

As I mentioned at tonight's meeting, I've written a helper BASH script for systemctl. Source is attached. Put it into /user/bin or /usr/local/bin (in which case you may need to add /usr/local/bin to root's PATH), and run 'sc --setup' to have it set up the symlinks. Brian

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MUUG Meeting, Feb 12, 7:30pm -- Cacti, RTFM: systemctl
by Gilbert E. Detillieux 05 Feb '19

05 Feb '19

The Manitoba UNIX User Group (MUUG) will be holding its next monthly meeting on Tuesday, February 12. The meeting topic for this month is as follows: Cacti Cacti is an open-source, web-based network monitoring and graphing tool designed as a front-end application for the data logging tool RRDtool. Cacti allows a user to poll services at predetermined intervals and graph the resulting data. Wyatt Zacharias will be giving us a new look at this software. RTFM: systemctl(1) Most Linux distros have now adopted systemd as the new init process. Gilbert Detillieux will introduce the very basics of using systemctl(1) to control services in a systemd-based environment. The group holds its meetings at 7:30pm on the second Tuesday of every month from September to June. (There are no meetings in July and August.) Meetings are open to the general public; you don't have to be a MUUG member to attend. ******************************************************************* Please note our meeting location for this month: *Room 1M28* Manitoba Hall, University of Winnipeg, entrance on Ellice Ave. between Spence and Balmoral St. Parking is available on the surrounding streets and in the lots on nearby streets. Look for signage once you're at the building, or ask a security guard. ******************************************************************* For more information about MUUG, and its monthly meetings, check out their web server: https://muug.ca/ Help us promote this month's meeting, by putting this poster up on your workplace bulletin board or other suitable public message board: https://muug.ca/meetings/MUUGmeeting.pdf -- Manitoba UNIX User Group E-mail: <gedetil(a)muug.ca> c/o Gilbert E. Detillieux Web: http://muug.ca/ University of Manitoba Phone: (204)474-8161 Winnipeg MB CANADA R3T 2N2 Fax: (204)474-7609

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MTS blocking NTP
by Trevor Cordes 27 Jan '19

27 Jan '19

I noticed that at one of the customers I have that uses low-end business MTS has had their NTP incoming/outgoing port (UDP 123) cut off (filtered) at the ISP. Incoming I can understand, but outgoing? All the computers in the office have their time out of sync now. Does anyone know what the internal Bell/MTS time server's IP/domain is? Surely they didn't cut us off to their internal one. Will have the customer contact them eventually, but you know how it goes with tech support. Looking for the quick solution... Anyone else have their UDP 123 cut off since Bell came along? Further: it looks like they are filtering outgoing only if your source port is also 123. That is hardcoded into ntp (from what I've read). But ntpdate allows the -u option to have the src port be >1024. I tried that and ntpdate -u does work, but ntpdate without the -u gets blocked. So they really are blocking in and out, but only src=123udp. Looks like chrony (and others) lets you specify src port, but I'm loathe to uproot the system I know because Bell is braindead. (MTS didn't use to block it, and block-happy Shaw does not block it.)

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Ryzen with Linux
by Trevor Cordes 23 Jan '19

23 Jan '19

Is anyone here using Ryzen (1 or 2, or derivatives) with Linux? (ECC irrelevant, fyi.)

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Looking for a half height server rack
by Hamish D 11 Jan '19

11 Jan '19

Hi Wayne. I may have what you are looking for. I am in the Neeginan Centre basement at 181 Higgins close to the east end on Fridays from 9 - 4. If you come in the east door and down the stairs we are the second door on the left, You are welcome to stop by and have a look. Have a nice day. Hamish Donaldson VE4JDH

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Looking for a half height server rack
by Wyatt Zacharias 04 Jan '19

04 Jan '19

Looking for a half size (20U - 30U) server cabinet or 4 post rack. If anyone has any leads on one please let me know. -- Wyatt Zacharias

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Jan 8 meeting - ethernet cards
by Adam Thompson 03 Jan '19

03 Jan '19

Assuming I make it to the meeting at all (here’s hoping), I expect to have four dual-port E1000 NICs to give away; two are PCI-E and two are PCI-X. Oh, and if anyone needs IDE/ATA cables, please let me know – I’ve got more here than I know what to do with, and would LOVE to send them to a good home. -Adam

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