amateur peripatetic sysadm @27607 - Tumblr Blog

Kenyon Windows Share on Linux

Mount Kenyon O: and P: drives from a linux computer via commandline.

First create directories (as user, from home dir):

mkdir mnt mkdir mnt/p mkdir mnt/h

Next edit /etc/fstab (as root)

Replace kenyon_user with Kenyon username

Replace local_user with local username

## Kenyon windows share //tiber.kenyon.edu/kenyon_user$ /home/local_user/mnt/h cifs user,noauto,username=kenyon_user,workgroup=KENYON,iocharset=utf8 0 0 //potomac.kenyon.edu/public /home/local_user/mnt/p cifs user,noauto,username=kenyon_user,workgroup=KENYON,iocharset=utf8 0 0

Now user local_user can mount (you will be prompted for PW)

See reference for storing credentials

$ mount ~/mnt/p

Kenyon Reference

Samba Reference

#linux #admin #Kenyon #samba

Debian upgrade breaks usb automount

The Polkit Blues

I'm currently on Debian testing (aka Debian Stretch). A recent apt-get upgrade broke automount for me. Google revealed a bunch of very old links, including references to the deprecated / now-absent usbmount package, and lots of people complaining about polkit.

I run lxde, and the lxsession package includes lxpolkit. But there's no manpage, no help, no nothing.

Assessing the Situation

I finally found moderately detailed instructions here, in an issue for udiskie.

First verify that polkit is running: systemctl status polkitd.service

Verify the desired user is in the plugdev group: id

Edit the following file: sudo vi /etc/polkit-1/localauthority/50-local.d/10-udiskie.pkla

Add the following (allows plugdev group to mount):

[udisks2] Identity=unix-group:plugdev Action=org.freedesktop.udisks2.filesystem-mount-other-seat;org.freedesktop.udisks2.filesystem-mount ResultAny=yes

Logout / Login, or just restart polkit?

sudo systemctl restart polkitd.service

#debian #linux #sysadmin

Brother HL-L2360D printer, Debian Jessie

Using system-config-printer Tested a number of drivers, finally got double-sided printing working with the following settings (and double-sided enabled in "Printer Options" tab):

Device URI: DNSSD Generic PCL 6/PCL XL Printer Foomatic/hpijs-pcl5c

#sysadmin

USB Ethernet Fail - virtual unplug

I spent the night chasing mysterious wired-network disfunction using an Anker USB combination hub/ethernet adapter. Turns out, it worked when I unplugged and replugged it.

The automated solution to this is usb_modeswitch. I use lsusb to find the device (Realtek 8152, ID 0bda:8153). I'm using systemd with an rc-local target and netctl, so I added a line to my /etc/rc.local file to toggle the network device:

usb_modeswitch -v 0x0bda -p 0x8153 --reset-usb netctl start TARGET

And enable the target: systemctl status rc-local.service

The network device config is a very simple file, /etc/netctl/eth-dhcp. I've also enabled this target with netctl, though I don't know if this is necessary.

This feels like an awefully round-about way (using systemd to call netctl), but I couldn't find a pre-up script option anywhere.

#linux #networking

Linux stream-to-chromecast

Interfaces nicely with pulse-audio. This didn't always work for me - I got occasional bursts of loud static.

https://github.com/masmu/pulseaudio-dlna

#linux #audio

Node.js CMS

Review articles

2015 comparison

Nov 2015 comparison

Keystone

theme selector in demo

works with WebFaction?

PencilBlue

Both require mongodb

Webfaction Node.js install docs

And then there's Meteor

Meteor vs MEAN

Webfaction meteor install - includes some mongodb wiring help

#cms #node.js #webfaction

CLI text message interface via cURL

#cli

R text output formatting

These took me a while to find...

Viewing help in terminal

Change indenting for text help (split screen, small text):

library(tools) Rd2txt_options(width=60, minIndent=4)

Pager for objects

options(width=300) less = function(x) page(x, method='print')

#R #documentation

Docker links

Docker has changed quickly, so many web resources are out of date.

Quickstart / Intro

The 15 Commands The Next 15 Commands

Admin

Clean up!

Cache Management

Volumes

Save versus Export

Moving containers around (save vs. export II)

Docker Registry (e.g. local)

Other

Docker registries review

#dev #sysadmin #docker

UDF > FAT32

UDF is a good choice for USB / external drives for modern multi-os use. It's also the successor of ISO 9660 for optical media.

UDF comparison

format-udf bash script

#sysadmin #osx

More Cloud Storage Options

Copy.com is soon to be discontinued. Google drive is somewhat slow and quirky, so I'm not sure I want it as a primary backup.

One tool to rule them all: rclone

rclone is in active development, and supports a range of cloud storage services. It functions as something of a swiss army knife to unify various services.

I'm using go to manage the install. To upgrade, I use:

go get -u github.com/ncw/rclone

Inexpensive Enterprise Solution: Backblaze B2

Backblaze has an affordable unlimited-space storage service, creatively called Cloud backup, but it's not linux-friendly. Their new B2 service (currently in beta) is targetted squarely at devs. It gives 10GB free, and provides full API access. It plays nice with rclone, and even has its own commandline interface.

Nice blog introducing B2 here.

Actually, the Backblaze blog appears to have a number of fantastic blog posts.

Lazy and Cheap: pCloud

pCloud provides a linux app (as a .deb file) and a decent web app. Their plans are inexpensive, and their free tier is generous.

The linux app has some nice options, including glob patterns for file exclusion, along with standard rate-limiters, etc. In all, it looks and feels a lot like Copy.com, if somewhat less visually slick.

They offer add-on client-side encryption, and there is a mobile app that I have not yet tried.

Google Drive

It's $2/month. It's tied to my email. But I'm not a big fan. rclone can't delete google docs, and permissions are weird. Files get duplicated by accident, and access is rather slow.

Increasingly, I'm leaning towards just keeping google drive mainly for email, and projects that rely heavily on file exchange over email.

#cloud #storage #sysadmin

The Vimeo Compression Labyrinth

Official Docs

Encoding blog post (see comments)

Blog post r.e. post-upload encoding behavior

Ghost themes (free)

Roundup of Free Themes on Col

abc

#webdev #ui #blog #ghost

chrome ssh tunnel

Ref: StackOverflow