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Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Archive for the ‘*nix-tools’ Category

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Scheduled jobs and jitter…

Posted by jpluimers on 2019/05/23

Too bad G+ doesn’t allow the WayBack machine or Archive.is to archive the whole thread at [WayBack] [Archive.is] Das es inzwischen fast überall Standard ist die Uhren mit einem guten Zeitsignal zu synchronisiseren (NTP, DCF-77, GPS etc) ist eigentlich eine gute Sache… – Kristian Köhntopp – Google+ so here are a few quotes below.

The generatel conclusions seem to be that:

This was the start:
Nils Ketelsen originally shared:

Guckt man live sieht es schon anders aus: Während die RunQueue meist so bei 4-5 liegt (bei 21vCPUs kein Problem) springt sie jede volle Minute einige Sekunden lang auf 20. Bei durch 2 Teilbaren Minuten auf ca. 40. Bei durch 10 Teilbaren Minuten auf 70, bei durch 15 teilbaren Minuten auf 150…. Ich habe eben durch einen schlecht getimten Toilettenbesuch die volle Stunde verpasst, das muss ich gleich mal anders hinbekommen, aber ich gehe davon aus, daß es da noch schlimmer ist.

And these some of the comments:

Read the rest of this entry »

Posted in *nix, *nix-tools, Algorithms, cron, Development, Power User, Software Development | Leave a Comment »

Not sure if this btrfs error was benign or not.

Posted by jpluimers on 2019/05/17

Booting the VM gave this in the log:

# btrfs balance /
WARNING:

    Full balance without filters requested. This operation is very
    intense and takes potentially very long. It is recommended to
    use the balance filters to narrow down the scope of balance.
    Use 'btrfs balance start --full-balance' option to skip this
    warning. The operation will start in 10 seconds.
    Use Ctrl-C to stop it.
10 9 8 7 6 5 4 3 2 1
Starting balance without any filters.
ERROR: error during balancing '/': Input/output error
There may be more info in syslog - try dmesg | tail
diaspore:~# dmesg | tail
[ 2261.857360] BTRFS info (device sda2): found 144 extents
[ 2261.922014] BTRFS info (device sda2): found 144 extents
[ 2262.003653] BTRFS info (device sda2): found 144 extents
[ 2262.146557] BTRFS info (device sda2): found 144 extents
[ 2262.268034] BTRFS info (device sda2): relocating block group 20951597056 flags data
[ 2268.255631] BTRFS info (device sda2): found 19765 extents
[ 2278.541549] BTRFS info (device sda2): found 19758 extents
[ 2278.685372] BTRFS info (device sda2): relocating block group 14558429184 flags data
[ 2278.714483] BTRFS warning (device sda2): csum failed root -9 ino 269 off 65150976 csum 0x27374190 expected csum 0x7091fbbc mirror 1
[ 2278.714619] BTRFS warning (device sda2): csum failed root -9 ino 269 off 65150976 csum 0x27374190 expected csum 0x7091fbbc mirror 1

Booting from a rescue DVD, then checking with an unmounted /dev/sda2 nothing is wrong:

localhost:~ # btrfs check /dev/sda2
Checking filesystem on /dev/sda2
UUID: 23d33d0f-0468-4408-b73c-b0eec9387d82
checking extents
checking free space cache
checking fs roots
checking csums
checking root refs
checking quota groups
found 6460166144 bytes used, no error found
total csum bytes: 5795704
total tree bytes: 214171648
total fs tree bytes: 193740800
total extent tree bytes: 12910592
btree space waste bytes: 40754145
file data blocks allocated: 35720101888
 referenced 11352182784

Both had the same version:

# btrfs version
btrfs-progs v4.13

If I ever need recovery, then these links likely help:

–jeroen

Posted in *nix, *nix-tools, btrfs, File-Systems, Power User | Leave a Comment »

Reset Linux Desktop To Default Settings With A Single Command – OSTechNix

Posted by jpluimers on 2019/05/16

To reset Ubuntu Unity or any other Linux desktop with GNOME/MATE DEs to its default settings, run:

dconf reset -f /

Source: [WayBack] Reset Linux Desktop To Default Settings With A Single Command – OSTechNix

I need to check if it works on OpenSuSE with XFCE as there the dconf command is installed, but I still have a default desktop (mainly because most of the work I do is using a terminal over ssh).

–jeroen

via: [Archive.is] Never thought about dconf reset… Joe C. Hecht – Google+

Posted in *nix, *nix-tools, Linux, Power User, X11 | Leave a Comment »

command line – How to access a usb flash drive from the terminal? – Ask Ubuntu

Posted by jpluimers on 2019/05/13

Based on [WayBack] command line – How to access a usb flash drive from the terminal? – Ask Ubuntu

Figure out the device:

  • lsblk
  • sudo blkid
  • sudo fdisk -l

Mount the device (assuming it is /dev/sdb1):

  • sudo mount /dev/sdb1 /media/usb
  • pmount /dev/sdb1
  • udisksctl mount -b /dev/sdb1

Unmounting and eject is in [WayBack] Linux (Ubuntu): safely remove USB flash disk via command line – Stack Overflow

–jeroen

Posted in *nix, *nix-tools, Linux, Power User | Leave a Comment »

BorgBackup – Deduplicating archiver with compression and authenticated encryption

Posted by jpluimers on 2019/05/06

On my research list:

Borg

Deduplicating archiver
with compression and encryption

BorgBackup (short: Borg) gives you:

  • Space efficient storage of backups.
  • Secure, authenticated encryption.
  • Compression: LZ4, zlib, LZMA.
  • Mountable backups with FUSE.
  • Easy installation on multiple platforms: Linux, macOS, BSD, …
  • Free software (BSD license).
  • Backed by a large and active open source community.

Source: [WayBack] BorgBackup – Deduplicating archiver with compression and authenticated encryption

Repositories:

–jeroen

Posted in *nix, *nix-tools, Development, Power User, Software Development | Leave a Comment »

osx lion – osx change printer ip address without adding new printer – Super User

Posted by jpluimers on 2019/04/29

From [WayBack] osx lion – osx change printer ip address without adding new printer – Super User:

Q

Is there a way to change a printer’s IP address in OSX (Lion) without having to add a new printer? I did find Printer IP Remedy, but was curious if there was an ‘official’ method.

A

You can do this in the CUPS web interface with the following steps:

  1. Open Terminal.app and run cupsctl WebInterface=yes. This enables the CUPS web interface
  2. Open http://127.0.0.1:631/printers in your web browser
  3. Click on the printer you want to change. From the “Administration” drop down, select “Modify Printer”.
  4. Log in with your local admin account
  5. Select the new printer IP either from “Discovered Network Printers” or add it manually with “Other Network Printers”. Make sure that you keep the same connection protocol as it says in “Current Connection” (for me, this was LPD).

Once you’re done with this, Mac OS X will directly print to the new IP address. There is no need to reboot or so. If you want to disable the CUPS web interface again, run cupsctl WebInterface=no.

The CUPS solution works splendid in MacOS as well, so there was no need for [Archive.is] Printer IP Remedy 1.3 free download for Mac | MacUpdate.

Without the CUPS web interface enabled, the web-interface at http://127.0.0.1:631/printers looks like this:

Web Interface is Disabled

The web interface is currently disabled. Run “cupsctl WebInterface=yes” to enable it.

After enabling it like the CUPS web interface wit cupsctl WebInterface=yes, you can see I have the same printer configured multiple times with different communication protocols and output languages:

Printers

Search in Printers:

Showing 6 of 6 printers.

Queue Name Description Location Make and Model Status
OKI_MC342_36855D OKI-MC342-PSO-36855D Office MC342-AirPrint Idle
OKI_MC342_36855D_PCL OKI-MC342-36855D PCL 1060NP-Office Generic PCL Laser Printer Idle
OKI_MC342_IPP OKI-MC342-IPP Office Generic PostScript Printer Idle
OKI_MC342_LPR OKI-MC342-LPR Office Generic PostScript Printer Idle
CUPS and the CUPS logo are trademarks of Apple Inc. Copyright © 2007-2015 Apple Inc. All rights reserved.

The first two printers were mapped by DNS, but the last two were mapped by IP address.

Changing the IP address was simple:

  1. Click on each link
  2. Select “Modify printer”
  3. Authenticate (only needed for the first printer change)
  4. For IPP: note the current address (like ipp://192.168.71.52/), then
    1. Choose “Internet Printing Protocol (ipp) “
    2. Click “Continue”
    3. Enter the correct ipp://…./ address (help is at http://127.0.0.1:631/help/network.html or http://127.0.0.1:631/help/network.html?PRINTABLE=YES)
    4. Click “Continue”
    5. Check the modifications (optionally change Description/Location)
    6. Click “Continue”
    7. Keep the driver
    8. Click “Modify printer”
  5. For LPD, note the current address (like lpd://192.168.71.52/), then follow the IPP steps, but choose “LPD/LPR Host or Printer” and enter a valid lpd address.

This is also the place where you can change “Default options”, like paper size (which – for all but the first – somehow defaulted to US Letter 11 inch, while it is actually filled with A4 paper).

At the end, disable the web interface: cupsctl WebInterface=no.

Related:

–jeroen

Read the rest of this entry »

Posted in *nix, *nix-tools, Apple, iMac, Mac, MacBook, MacBook Retina, MacBook-Air, MacBook-Pro, MacMini, macOS 10.12 Sierra, macOS 10.13 High Sierra, Power User | Leave a Comment »

How to Find Out Top Directories and Files (Disk Space) in Linux

Posted by jpluimers on 2019/04/26

Cool list of ls , sort and find to get the largest files, directories: [WayBack] How to Find Out Top Directories and Files (Disk Space) in Linux.

–jeroen

Posted in *nix, *nix-tools, Linux, Power User | Leave a Comment »

OpenSuSE: multi-megabyte binary blob `/etc/udev/hwdb.bin` does not need to be versioned with `etckeeper` – via Unix & Linux Stack Exchange

Posted by jpluimers on 2019/04/22

I wondered [WayBack] linux – Why is this a binary multi-megabyte blob /etc/udev/hwdb.bin under /etc? – Unix & Linux Stack Exchange.

All my OpenSuSE systems had the /etc/udev/hwdb.bin file with sizes varying between 7.5 and 10 megabytes with many of the zypper dist-upgrade causing updates.

Luckily the system also contains these files which had valid unit definitions, so the file was generated/updated during boot:

  • /usr/bin/systemd-hwdb
  • /usr/lib/systemd/system/sysinit.target.wants/systemd-hwdb-up‌​date.service
  • /usr/lib/systemd/system/systemd-hwdb-update.service

Thanks [WayBack] nwildner for answering that question!

So after installing etckeeper and performing etckeeper init you can immediately remove it from the git repository:

# cd /etc
# git rm --cached /etc/udev/hwdb.bin
rm 'udev/hwdb.bin'
# git commit -m "no need for /etc/udev/hwdb.bin to be under revision control as systemd-hwdb maintains it"

For more background, see [WayBack] How to make Git “forget” about a file that was tracked but is now in .gitignore? – Stack Overflow.

–jeroen

 

Posted in *nix, *nix-tools, etckeeper, Linux, openSuSE, Power User, SuSE Linux, systemd, Tumbleweed | Leave a Comment »

Postfix and blacklists

Posted by jpluimers on 2019/04/19

Still learning postfix configuration, below are some links on how to enable various blacklists that use the RBL DNS (aka [WayBack] DNSBL) way of operations.

They are centered around using the of the [WayBack] Postfix Documentation entry reject_rbl_client listings:

Basically reject_rbl_client is part of smtpd_client_restrictions.

TODO:

I need to dig further into some other blacklist options than reject_rbl_client: reject_rhsbl_client, reject_rhsbl_reverse_client, reject_rhsbl_sender or reject_rhsbl_recipient restriction.

Then I need to go through these links:

Some blacklist checking links:

–jeroen

Posted in *nix, *nix-tools, postfix, Power User | Leave a Comment »

mail-filters/Makefile at master · fumiyas/mail-filters

Posted by jpluimers on 2019/04/15

Cool tool if you use Postfix: mail-filters/Makefile at master · fumiyas/mail-filters.

You set it up like this:

cd /etc/postfix
wget https://raw.githubusercontent.com/fumiyas/mail-filters/master/postfix/Makefile

Then each time you change your postfix configuration:

cd /etc/postfix
make

In that directory, it will (re)generate a Makefile.postmapbased on the lines with hash in main.cf, then make each .db file from the source hash file.

After that you have to manually restart postfix, which depends on your Linux flavour.

Similar solutions:

–jeroen

Posted in *nix, *nix-tools, Development, Makefile, postfix, Power User, Scripting, Software Development | Leave a Comment »

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