Bits and thoughts

#!/bin/bash is not rude

GNUSocial on RaspberryPi

Written by ⓘⓓⓔⓝⓣⓛⓤⓓ - -

After a few days of running GNUSocial on RaspberryPI I came to the conclusion that the huge amount of data that it processes through mysql is too important for the tiny memory of my RaspberryPI.

The GNUSocial database had become corrupted and was irrecoverable. I had to move it away from mysql harms and restart mysqld.

My previous server is still running. I simply lost 4 days of messages from my dear colleagues ...

Changing GNUSocial log files

Written by ⓘⓓⓔⓝⓣⓛⓤⓓ - -

GNUSocial uses syslog to create logs during its execution. As there are no specific indications these logs all go to /var/log/syslog.

Mixing sub-systems

This is also where some other sub systems are writing their own logs.
awk '{print $5}' /var/log/syslog \
| sed -e 's/[0-9].//g' \
| tr -d '[]' \
| sort -u
gives this result :

Configure GNUSocial to use its own log file

I wanted to have GNUSocial logs separated from the other subsystems. I followed the instructions of the documentation and I modified config.php to add two lines (I did that when it was still
#logs$config['site']['logdebug'] = false;
$config['site']['logfile'] = '/var/log/statusnet/statusnet.log';
At the first attempt to write a log it failed ... nothing was logged  in /var/log/statusnet/statusnet.log . Looks like a user permissions problem.... (www-data is the group of www-data user who runs Apache)
chown -R root:www-data /var/log/statusnet
chmod g+w /var/log/statusnet/statusnet.log

Limit the growth

Now that GNUSocial logs should be on their own, how can I limit their disk usage over time ? On a linux system the answer is by logrotating them. So I wrote a logrotated configuration file for these logs in /etc/logrotate.d/statusnet
  rotate 7
        create 660 root www-data
This a read like this :
  • /var/log/statusnet/*.log : consider every file named *.log in /var/log/statusnet directory
  • rotate 7,  daily,  missingok,  notifempty,  delaycompress,  compress : every day create a new log file and keep the seven latest log files. If nothing was written in the log file than do noting. You can also ignore the log rotation if there is no file at all. And, by the way, compress it so that it takes even less room.
  • create 660 root www-data : every new log file should be created so that users belonging to www-data group and root itself can read and write the file

Strange behaviour

Using the aforementioned configuration of config.php I expect not to see any more debug logs and I expected to see every log in /var/log/statusnet/statusnet.log ... Well that's not what is happening : 
  • /var/log/sysout still contains GNUSocial logs but much less than before. I can read daemon messages and every messages stating that a PHP call is "Including config file: /var/www/statusnet/config.php"
  • LOG_DEBUG messages are in /var/log/statusnet/statusnet.log
Discussing with @jpope I configured LogFilter plugin
addPlugin('LogFilter', array( 'priority' => array(LOG_ERR => true,    LOG_INFO => true,    LOG_DEBUG => false),    'regex' => array('/About to push/i' => false,      '/Including config file/i' => false,      '/Successfully handled item/i' => false)      ));
But these line are still printed out. A quick search indicates that ./lib/statusnet.php is the culprit
# find . -name "*.php" -exec grep -H "Including config file" '{}' \;./config.php:      '/Including config file/i' => false,./lib/statusnet.php:    common_log(LOG_INFO, "Including config file: " . $_config_file);
My next step is to change this message priority to LOG_DEBUG by editing ./lib/statusnet.php ... to no avail for the message is still present ...

Ocam's razor is still sharp :
common_log(LOG_INFO, "Including config file: " . $_config_file);
//common_log(LOG_INFO, "Including config file: " . $_config_file);
in ./lib/statusnet.php

Et voilà ...

Self-Hosting on Raspberry Pi

Written by ⓘⓓⓔⓝⓣⓛⓤⓓ - -

I recently bought a RaspberryPi v2.

My goal is to selfhost some of my services :
  • email
  • GNUSocial instance
  • XMPP server
  • This blog !!

I had to migrate all these services from my previously OVH hosted site. I won't bother you much with the details but it took me 2 days and a half to migrate it all.

I started with my email server because I like to start with difficult things. And then my GNUSocial instance. The XMPP Server was a piece of cake (If you retrieve what was parameterized in /var/lib/prosody too ...).

As for now it runs smoothly and very very silently.

The largest memory hog is mysql of course !

Fail2ban Analysis

Written by ⓘⓓⓔⓝⓣⓛⓤⓓ - -

Having restarted my fail2ban daemon on 2014-12-17 I was curious about the time distribution of bans and their original location.I crafted a small bash one-liner that gives me raw data : 
for ipadd in $(zgrep Ban fail2ban.log.* | awk '{print $NF}' | sort -u); \
do \
zgrep $ipadd fail2ban.log.* | awk -F':' '{print $2 $NF}' ; \
done | awk '{print $1" " $NF}' | \
grep -v '2014-12-16\|2014-12-15\|2014-12-14\|2014-12-13\|2014-12-12\|2014-12-11\|2014-12-10\|2014-12-09\|2014-12-08\|2014-12-07' \
| sort | while read data; \
do \
ipaddr2=$(echo $data | awk '{print $2}'); \
country=$(whois $ipaddr2 | egrep -i "^country:"| awk '{print $NF}' | sort -u); \
echo $data $country; \
It represents a total of 270 bans in almost three weeks.The ip adresses for which there is no country code is because the whois returned a Korean UTF-8 content that I couldn't parse. But they are all Koreans (I checked them manually).

IP address bans by day China comes first with 97 bans. It is followed by the United states of america (50 bans) and then Germany (30 bans).

Debian Jessie Multimedia

Written by ⓘⓓⓔⓝⓣⓛⓤⓓ - -

Debian Jessie (Debian 8) is, by default, provided with many multimedia capabilities.

Playing any audio files comes natively with the platform. Watching a video recorded from your phone is easy once the video has been downloaded to the computer where Jessie is installed.

Some DVDs are directly playable and some of them require libdvcss which is not provided on debian repositories because of legal stuff but it can be downloaded as a debian package from videolan.

Flash video playing is not pre-installed. There is a way to install Flash but more and more websites use HTML5 video tag to provide video content. This makes Flash quit useless. But anyway it can still be installed if you add "non-free" repository to your package repository configuration. There are plenty of sites to show you how to do that ...

There are some websites that propose videos on .mp4 format. This working very well with a default install in Iceweasel. The solution is simply to install ffmpeg plugin for gstreamer :
sudo apt install gstreamer0.10-ffmpeg
I don't have a blue-ray drive so I can't tell how well blue-ray is working on Debian Jessie ...

Perhaps there are some other tricks for an advanced usage of multimedia that I'm not aware of !