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The djbdns server
DJBDNS the only real alternative for BIND. One of the most popular alternatives of the DNS server is the simple and safe DJBDNS system created by a mathematics professor D.J. Bernstein. The micro-course describes the way of installing the dnscache and tinydns servers being elements of the djbdns packet. Keywords: djbdns, tinydns, dnscache
High Performance Computing – using the OpenMPI library
OpenMPI – open mind for distributed calculations. The micro-course describes using the OpenMPI library in the OpenMPI mechanisms. Keywords: OpenMPI, HPC, cluster, supercomputer High Performance Computing – using the OpenMPI library Installation of the system Cloning SSH Preparing the MPI environment and compiling an example program Running the process through MPI on many processors OpenMPI in the CentOS system
Network traffic analysis
You do not know what is happening in the network – use tcpdump. The micro-course discusses how to analyze the network traffic using the tcpdump or tshark commands and how to test the availability of hosts and services with the use of ping and hping commands. Keywords: ping, hping, tcpdump tshark
Kerberos
Secure authentication – only with Kerberos. Kerberos is a protocol designated for authentication and authorization in computer networks. The mechanism based on this protocol mediates in confirming user identity and ensures secure access to remote services. The micro-course describes the rules of the mechanism, architecture and basic terms. Moreover, it describes installation and configuration of the system on the basis of Kerberos MIT implementation being the most popular non-commercial version of this mechanism. Keywords: Kerberos, kye seurity, Needhama, Schroedera, ticket, authentication, authorization, KDC, Key Distibution Center, Kerberos MIT, Heimdal Kerberos Kerberos – simplified way of working Kerberos – simplified way of working – stage one Kerberos – way of working Important features of the Kerberos protocol The Kerberos system glossary Implementations of the Kerberos system Installation of Kerberos Kerberos configuration
Systems of discussion groups (discussion lists)
Not only NNTP is used for supporting discussion groups. The micro-course presents programs for supporting discussion lists using electronic mail. These are systems doing tasks similar to those of Usenet yet managing them is less complicated. Such systems are good for creating simple, local discussion lists. This micro-course describes installation and configuration of the Mailman system. Keywords: mailman, ezmlm. sympa, discussion groups
Bacula - file recovery
The server is dead. Recover data from the copy made by Bacula. A description of the procedure of recovering files in the Bacula system. The micro-course describes the mechanism of client configuration in the network, the way of creating backup copies and the way of recovering data. Keywords: Bacula, DIR, SD, FD, directory manager, storage daemon, file daemon, rescue, recovery, restore backup
Testing the DNS queries
What is DNS and what is it used for? Poorly configured domain name system can cause problems in network communication, This is what the administrators often say. It is fundamental to know the tools and to have the knowledge to test the operation of the DNS system and search for bugs in it. Micro-course provides practical knowledge about the commands: host, dig, nslookup, whois.
Spamassassin and the SPF mechanism
You had better not send me spam or I will use the Spamassassin. The Spamassassin and the SPF mechanism are basic methods of securing the mail server against unwanted mail – spam. Knowledge about these technologies will allow you to create a modern system of supporting electronic mail on the basis of free Open Source solutions. Keywords: spamassassin, spf, antyspam, spam, e-mail, filtering
Electronic mail server - Postfix
The most popular electronic mail server The micro-course discusses installation and configuration of currently the most popular electronic mail server and SMTP that is Postfix. You can also find here information on verification of configuration files and the method of managing the server. Keywords: postfix, main.cf, postconf, newaliases, master.cf, postsuper, postcat, postqueue
E-mail message format
I created a mail message, sent it to the mail server. But what really was created? In what form Thunderbird sent the e-mail to the server. Mail message format used by the mail clients, mail servers, etc. We describe the structure of messages, how it is possible to place pictures and attachments into it. How to put the contents of the message in both plain text format and in HTML format ?
