Archive and statistics » History » Revision 10
Revision 9 (Janez Barbic, 12.12.2010 16:31) → Revision 10/17 (Janez Barbic, 12.12.2010 21:34)
h1. Archive and statistics
WIP - trenutno se delam na dokumentu, ne se brat :)
{{toc}}
TBD - to be discussed
TODO - to do :)
Tole sem pustil zaenkrat not, da lahko hitro najdem stvari, ki jih moram se dopolnit oziroma jih moramo se predebatirat. V koncni verziji se bom teh kratic znebil in tudi tega komentarja v slovenscini :)
h2. 1 Basic concept
TODO Zakaj syslog
Eneraptor is designed in a way that it could communicate with any device regardless of its operating system. Syslog, system for logging program messages offers a quick and easy solutions for such communications, because it allows separation of the software that generates messages from the system that stores them and the software that reports and analyzes them. It could refer to syslog protocol (TODO described below),
h3. 1.1 Hardware
p. We will be using syslog-ng (I will be referring to it as syslog from now on), which has a few advantages over conventional syslog. Syslog daemon will run on proxy server. TBD it will be listening on a certain port for incoming messages from client(s). Our main syslog client will run on FRI-SMS system.
Client mode operation:
!https://lusy.fri.uni-lj.si/redmine/attachments/11/client_server_syslog.png!
p. In client mode, syslog-ng collects the local logs generated by the host and forwards them through a network connection to the central syslog-ng server. Clients can also log the messages locally into files.
TODO more details on syslog-ng advantages
h3. 1.2 Syslog protocol overview
TBD TCP/IP vs UDP
Message structure
TBD How do we plan to send messages to our daemon, via client (not always possible) or do we generate them ourselves?
TBD Using logfiles vs logging into database
h3. 1.3 Development steps
# Installing and configuring Syslog-ng daemon on proxy
# Installing and configuring Syslog-ng client on FRI-SMS
# TBD Designing Statistical Data Analysis Software to work with data collected by syslog daemon
# TBD Implementing SDA software
# TBD Testing?
h2. 2 Installing and configuring syslog-ng daemon on proxy
p. Syslog-ng supports wide variety of Operating Systems so we aren't really restricted here. Since our proxy and FRI-SMS both run Linux 2.6 our obvious choce is syslog-ng for Linux.
h3. 2.1 syslog-ng daemon on proxy
Configuration file location:
/opt/syslog-ng/etc/syslog-ng.conf
Basic syslog configuration:
TODO add filters
<pre><code class="ruby">
@version: 3.2
#Default configuration file for syslog-ng.
#
# For a description of syslog-ng configuration file directives, please read
# the syslog-ng Administrator's guide at:
#
# http://www.balabit.com/dl/html/syslog-ng-admin-guide_en.html/bk01-toc.html
#
options {
time_reap(30);
mark_freq(10);
keep_hostname(yes);
};
######
# sources
source s_local {
};
source s_net {
tcp(ip("SERVER_ADDRESS") port(5140) keep-alive(yes));
};
######
# destinations
# should be able to point syslog to a database here
destination net_messages { file("/var/log/net_messages"); };
log {
source(s_net);
destination(net_messages);
};
</code></pre>
h3. 2.2 syslog-ng client on FRI-SMS
Configuration file location:
/opt/syslog-ng/etc/syslog-ng.conf
Basic syslog client configuration:
TODO add filters
<pre><code class="ruby">
@version: 3.2
#Default configuration file for syslog-ng.
#
# For a description of syslog-ng configuration file directives, please read
# the syslog-ng Administrator's guide at:
#
# http://www.balabit.com/dl/html/syslog-ng-admin-guide_en.html/bk01-toc.html
#
options {
};
######
# sources
source s_local {
# TBD what triggers our messages
# message generated by Syslog-NG
internal();
# standard Linux log source (this is the default place for the syslog()
# function to send logs to)
unix-stream("/dev/log");
# messages from the kernel
file("/proc/kmsg" program_override("kernel"));
};
######
# destinations
# local
# destination d_messages { file("/var/log/messages"); };
# net
destination host { tcp("SERVER_ADDRESS" port(5140)); };
# logging locally
# log {
# source(s_local);
# destination(d_messages);
#};
# sending log messages
log {
source(s_local);
destination(host);
};
</code></pre>
h2. Statistical Data Analysis Software
TODO
h2. References
"Syslog protocol, RFC 5424": http://tools.ietf.org/html/rfc5424