•September 1, 2014 • Leave a Comment
Have been working with Ardour lately and the multiple audio devices (internal + PCI) have been causing issues both on output and input. The easiest workaround is removing totally the unused sound card, which in my case was the internal Intel HDA. The single step required was to blacklist the module of the sound card. You can identify the module by “lspci” and then blacklisting the module is straight forward:
and add the line
blacklist <module name>
A single reboot should do the job or you could unload the module instantly. Although, reboot would confirm whether the blacklist function worked or not.
•May 16, 2014 • Leave a Comment
I have a database with some records that among other details they also declare a local (Greek) street addresses. The requirement is to retrieve all these records from the database and display them with markers on a Google Map. Before everything, if you want to get an idea on how the API works see the following links:
- GoogleMaps API – Getting started
– GoogleMaps API – Simple markers
The flow for my task has as follows:
- Connect to database
– Retrieve all the locations from DB
– Convert Greek characters to Latin for avoiding issues with the Web Service request [ code on code.loon.gr ]
– Use GoogleMaps API to retrieve GPS coordinates based on the given location
– Parse JSON response
Full code on GitHub.
•May 9, 2014 • Leave a Comment
Μετάφραση στα ελληνικά του locate για το back-end του Croogo. Διαθέσιμο στο GitHub.
•January 30, 2014 • Leave a Comment
Here is the scenario:
- Domain that needs to be backed up (public_html, mail, database).
– Only access available via cPanel and FTP.
– Need automated daily full backup.
- Take full backup on server and compress its contents (cronjob on remote server)
– Download via FTP the compressed file to the local machine (cronjob on local machine).
– Delete compressed file.
There might be tools that do this, although I didn’t come across any while looking on the web. I implemented a simple solution based on bash scripts that gets the task done.
- backup.sh: Goes on the remote server to run as a cronjob.
– ftp.sh: Runs locally (on the machine that will store the backup) as a cronjob.
– .netrc: Defines the FTP account details (stored in /home/$user/.netrc)
•November 11, 2013 • 3 Comments
The following configuration has been performed in Debian but should apply in any Linux distro with Postfix installation. The task quite simple: use Gmail as SMTP relay for outgoing email traffic.
1) At first place I had to install the following packages and turn off sendmail:
apt-get install postfix mailutils libsasl2-2 ca-certificates libsasl2-modules
service sendmail stop
2) Then edit the configuration file at /etc/postfix/main.cf by adding the following options at the end of the file:
# Gmail SMTP relay
relayhost = [smtp.gmail.com]:587
smtp_sasl_auth_enable = yes
smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
smtp_tls_CAfile = /etc/ssl/certs/ca-certificates.crt
3) Create the authentication file at /etc/postfix/sasl_passwd and set the right permissions:
chmod 400 /etc/postfix/sasl_passwd
Make sure the file is owned by the user who runs the Postfix daemon.
4) Reload Postfix:
service postfix reload
5) Confirm the configuration is actually working by sending a test mail:
echo "Test mail from postfix" | mail -s "Test Postfix" firstname.lastname@example.org
The sender of the email should be the given Gmail account. Also, in the “Sent” folder of the Gmail account you should see the email you have sent with Postfix.
If your domain is using Gmail’s infrastructure for handling emails, you can replace @gmail.com with your domain and use the corresponding account details.
NOTE: This configuration will be sending any system message as “email@example.com” and therefore is not advised to be used in multi-user environment.
•November 5, 2013 • Leave a Comment
Being in need to issue POST requests from within a Java application, and wanting re-usable code, I created a very simple Java library for issuing POST and GET requests to a remote server.
POST source code – GET source code
Usage (POST example):
POST post = new POST();
post.postRequest("http://www.myservice.com/service", "param1=foo¶m2=bar", "Mozilla/5.0");
In other words, the arguments are:
post.postRequest(SERVER_URL, PARAMETERS, AGENT);
The output can be manipulated as desired, depending on what you response you except you should use a corresponding element/object.