If you ever need to do a factory reset on a Yealink phone, maybe if you forgot the admin password, simply hold the OK key down for 10 seconds and follow the prompts.
Thanks to Langineers for that tip.
Sometimes you want to preserve file permissions under subdirectories in linux with ACLs but that’s not the whole story. If you want multiple users to be able to read and write to these files, and the group permissions to stay correct, you need to set ACLs and also group +s on the subdirectories. This is to ensure new files and directories are also created with the correct permissions and group ownership.
I wrote a small script that takes a group and a directory as parameters, and recursively fixes the permissions and set new ACL and group permissions so in future, new files will have the correct permissions.
I put set-acl-permissions on github.
It blindly recursively sets permissions so be careful. Also, it may well contain bugs that could cause catastrophic failures.
A while ago I broke my favourite mug. After a long and difficult search I found a new mug. A mug with the periodic table of elements entry for uranium on it. It also glows in the dark. Gav from the hacker space has a Geiger counter so I took the opportunity to measure the radioactivity of my mug. Luckily it’s not radioactive at all. Only 0.106μSv/h (micro Sieverts per hour).
Sometimes you might need to copy a whole directory from a remote host, but the remote host does not have enough space to tar the whole thing up and then sftp it off. The solution is to tar/bzip the directory and stream it directly to your local host:
ssh root@remotehost 'tar cjf - /path/to/somedirectory' | pv -cN tar > somedirectory.tar.bz2
Using pv (pipe viewer) gives you extra progress bar goodness:
tar: 176MB 0:09:14 [ 371kB/s] [ <=> ]
I’ve been on a quest to find a good remote for MythTV. My first try was with a Logitech Harmony. Those things are nasty horrible pieces of crap. I’d never touch one again. Programming it is a nightmare. It does not have a generic PVR option so you have to fake it to make it work with Mythtv by telling it its another device and learning those codes in LIRC. It is a very slow device with what felt like a 500ms delay with each keypress. It also tried to know what state your equipment was in so that it could turn things on and off, but of course it would always be out of sync and then you’d have to go through this process of turning things on and off until it was in sync again.
Enter the HP MediaSmart IR remote, also known as HP RC2285202/01. These devices used come with a media player box that HP used to sell. As far as I can tell, its not in production anymore but the remotes are readily available on Ebay.
There are a few downsides too:
I spent many hours trying to work out why it would not work on my system. In the end it came down to two things.
For some reason LIRC does not work correctly with MCEUSB receivers that are plugged into USB3 sockets.
You need to tell the kernel to treat the receiver as lirc rather than anything else, in order for LIRC to be able to connect to it:
$ sudo sh -c "echo lirc > /sys/class/rc/rc6/protocols" $ sudo cat /sys/class/rc/rc6/protocols rc-5 nec rc-6 jvc sony mce_kbd [lirc]
The word [lirc] surrounded with square brackets tells you it worked.
I implemented this at boot time by adding
to /etc/rc.local and then in /etc/rc-scripts/start-lirc
#!/bin/bash echo "Making lirc the default for rc" echo lirc > /sys/class/rc/rc0/protocols echo "Starting lircd" /etc/init.d/lirc start
Remove lirc from the normal startup process:
$ sudo update-rc.d lirc remove
Test your configuration (retrieve HP-RC2285301-01.conf below):
$ sudo /usr/sbin/lircd -n -d /dev/lirc0 -P ./lirc.pid HP-RC2285201-01.conf $ irw
And when you press the keys on your remote, you should see some output from irw.
cd /usr/local/freeswitch git init echo 'db/*' >> .gitignore echo 'log/*' >> .gitignore echo '.svn*' >> .gitignore git add -A git commit -m "Initial Commit" git checkout -b try1
cd /usr/src svn checkout http://fusionpbx.googlecode.com/svn/trunk/ fusionpbx cd fusionpbx cp -a fusionpbx /var/www/fusionpbx
<VirtualHost *:80> ServerAdmin webmaster@localhost ServerName freepbx.example.com DocumentRoot /var/www/fusionpbx <Directory /> Options FollowSymLinks AllowOverride None </Directory> <Directory /var/www/fusionpbx/> Options Indexes FollowSymLinks MultiViews AllowOverride None Order allow,deny allow from all </Directory> ScriptAlias /cgi-bin/ /usr/lib/cgi-bin/ <Directory "/usr/lib/cgi-bin"> AllowOverride None Options +ExecCGI -MultiViews +SymLinksIfOwnerMatch Order allow,deny Allow from all </Directory> ErrorLog /var/log/apache2/error.log # Possible values include: debug, info, notice, warn, error, crit, # alert, emerg. LogLevel debug CustomLog /var/log/apache2/access.log combined Alias /doc/ "/usr/share/doc/" <Directory "/usr/share/doc/"> Options Indexes MultiViews FollowSymLinks AllowOverride None Order deny,allow Deny from all Allow from 127.0.0.0/255.0.0.0 ::1/128 </Directory> </VirtualHost>
Then enable the site with
And after you install and you realise it didn’t quite go as planned
root@fusionpbx: # su - postgres postgres@fusionpbx:~$ psql postgres=# drop database fusionpbx; postgres=# create database fusionpbx; postgres=# alter user fusionpbx with password 'XXXX'; grant ALL PRIVILEGES ON DATABASE fusionpbx to fusionpbx;
I needed to allow access to my Dashing dashboard over ssl from the Internet. I decided to proxy it behind Apache and get Apache to do all the SSL heavy lifting, mainly because I couldn’t work out if and how you could enable SSL within Dashing itself.
It turned out to be quite simple to implement. I simply created a vhost configuration for my dashboard and enabled it in Apache.
Create a file called dashboard in /etc/apache2/sites-available/ with the following content:
<VirtualHost *:80> ServerName dashboard.example.com Redirect permanent / https://dashboard.example.com/ </VirtualHost> NameVirtualHost *:443 <VirtualHost _default_:443> SSLEngine On SSLCertificateFile /etc/ssl/CAcert.cert.pem SSLCertificateKeyFile /etc/ssl/private/key.pem ServerAdmin webmaster@localhost ServerName dashboard.example.com ErrorLog "/var/log/apache2/dashboard-error_log" CustomLog "/var/log/apache2/dashboard-access_log" common <Proxy *> Order allow,deny Allow from all </Proxy> ProxyPass / http://mylocalserver.example.com:3030/ ProxyPassReverse / http://mylocalserver.example.com:3030/ </VirtualHost>
Ensure the proxy modules are enabled:
$ sudo a2enmod proxy Enabling module proxy. To activate the new configuration, you need to run: service apache2 restart $ sudo a2enmod proxy_http Enabling module proxy_http. To activate the new configuration, you need to run: service apache2 restart $
Enable the new dashboard site:
$ sudo a2ensite dashboard
Check your configuration is working before restarting apache:
$ sudo apachectl configtest Syntax OK $ sudo service apache2 restart [ ok ] Restarting web server: apache2 ... waiting . $
Don’t forget to delegate your dashboard.example.com hostname to resolve to your apache server’s IP address.
Now visit http://dashboard.example.com/name_of_your_dashboard. Your browser should automatically get redirected to https://dashboard.example.com/name_of_your_dashboard and you should see your dashboard.
Our heated towel rail’s brackets broke from old ages recently. After investigating getting a new towel rail and finding out they were quite expensive, I decided to try and design and 3D print new brackets for it.
The first cut of the design turned out to have too little space for the nuts. A second draft with a little more space and it worked perfectly.
The top left of the above image shows the broken parts and the bottom center shows 2 of the 3d printed replacement parts.
Have you ever wanted to give several users permission to work on files within a directory, but then struggled with what permissions and user:group ownership to set them to so users can always edit the files?
You might think the solution is to make the parent directory owned by a common group, lets say dev, and then try and make the permissions flow through to the files within. This doesn’t work though, and new files will still be created with the user’s umask, typically 644, which is no good as it results in the other users not being able to edit the file.
The solution lies in ACLs (Access Control Lists). Thanks to Pelle at Stackoverflow for making such a concise set of steps to set this up. Blatantly copied here:
First add the acl option to the mounted partition where the directory is you want to apply this to. Add the acl option to the mount point in /etc/fstab:
/dev/xvda1 / ext3 errors=remount-ro,acl 0 1
Then remount the filesystem to enable it:
# mount -oremount /
Then set the permissions using the setfacl command:
# setfacl -dm u::rwx,g::rwx,o::r /shared/directory
Test by creating a new file in /shared/directory:
/shared/directory$ touch test /shared/directory$ ls -al test -rw-rw-r-- 1 jason dev 0 Feb 20 12:37 test
Marvel in the wonders of modern filesystems.
FreeCAD is a parametric 3D modeler. Parametric modeling allows you to easily modify your design by going back into your model history and changing its parameters. FreeCAD is open source (LGPL license) and completely modular, allowing for very advanced extension and customization.
There are several great things about this.