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ADMIN-Tipp: DHCP-Server testen

Created: 19 December 2013 | Written by Super User | Print | Email | Hits: 5234

ADMIN-Tipp: DHCP-Server testen

Carsten Schnober

Der DHCP-Server eines jeden Netzwerks erfreut sich häufiger Benutzung, aber wenig Beachtung. DHtest nimmt ihn unter die Lupe.

Der DHCP-Server spielt in den meisten Netzen eine entscheidende Rolle: ohne ihn erhalten die Clients keine IP-Adressen und somit scheitert ihre gesamte Netzkwerkkommunikation. Im Normalfall verrichtet er unscheinbar seinen Dienst, aber die Suche nach eventuellen Fehlern ist nicht leicht und lohnt sich auch präventiv. Das Tool DHtest bietet sich für diesen Zweck an.

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Category: Linux

Ubuntu 13.10 - Laptop Problem

Created: 24 November 2013 | Written by Super User | Print | Email | Hits: 5124

Ubuntu 13.10

Toshiba Satellite Laptop

Auf dem Laptop wurde Ubuntu 13.10 Saucy Salamander installiert als Server Version.

Problem:

Beim schliessen des Deckel, ist das Laptop "eingeschlafen" und war nicht mehr erreichbar.

geholfen hat:

Ubuntu Server 13.10 now goes to sleep when closing laptop lid

go to:

vi /etc/systemd/logind.conf

file and uncomment/modify/add the line:

HandleLidSwitch=ignore

Then execute

sudo restart systemd-logind

or simply reboot.

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Category: Linux

php.ini anpassen

Created: 22 December 2012 | Written by vincent | Print | Email | Hits: 5400

Die php.ini datei beinhaltet die konfiguration und parameter. Zum Beispiel

upload_max_filesize

post_max_size

apassungen erfolgen

sudo su

vi /etc/php5/cgi/php.ini

nach der anpassung muss apatch neu gestartet werden.

/etc/init.d/apache2 restart

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Category: Linux

DNS Funktionskontrolle

Created: 22 December 2012 | Written by vincent | Print | Email | Hits: 5303

wie kann man die funktionsweise oder errormeldung eines DNS Server/Dienst kontrollieren:

dig @localhost deinedomain.tld

Fehler zum DNS Server findest Du so:

grep named /var/log/syslog

mit dem Befehle

ls -g /etc/bind/

können die erstellen/vorhandenen Zonen files gelistet werden und dann mit vi editiert werden

vi /etc/bind/pri.example.com

Wenn ein restart von Bind nötig ist dann

sudo /etc/init.d/bind9 restart

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Category: Linux

LTS (Long Term Support)

Created: 01 December 2012 | Written by vincent | Print | Email | Hits: 5556

auf der Suche nach der Bedeutung des Kürzel LTS habe ich diese gute erklärung im Netz gefunden

Ubuntu: What exactly does LTS mean?

With the recent release of Ubuntu 8.04 (Hardy Heron), a lot of hype was generated (Overhype or well-deserved, that’s for another post). One of the main highlights of all the stories, news and reviews doing the rounds are that this is an LTS version. But many people, mostly those who are new to Ubuntu, and even a few who are already using it, are not sure what LTS really means.

Literally expanded, it stands for Long Term Support. Yeah right, but what does it actually mean. Does it mean I’ll keep getting updates till eternity or what? The explanation is quite simple really.

Long Term: What it means is that while a normal non-LTS is supported for 18 months, an LTS version will be supported for 3 years or 36 months (and 5 years for the server version).

Support: Now, don’t just jump into downloading it and installing on reading the long term part. This DOES NOT mean that you’ll continue getting newer versions of favourite software packages till that time. This only means that you’ll continue getting “security updates” for 3 (or 5) years. What’s the difference, some might ask, as they think that the newest version of a software is the most secure. However it is not so. A newer version may bring more features, but also more code to become vulnerable to bugs.

So, in a nutshell, to understand the situation, let’s take an example. If Hardy has a software X with version 1.3, and after 2 years the software moves to version 2.5, you’ll not be able to get version 2.5 from the hardy repositories but a version “1.x-ubuntuy”, which will have all the security and major bug fixes for that software, but not the new features that you might see in later versions.

I just did this post so that people don’t jump into it by getting a wrong impression about LTS and later on be disappointed on learning the fact. So, now you can make an informed decision.

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Category: Linux

aptitude - Befehle

Created: 01 December 2012 | Written by vincent | Print | Email | Hits: 5521

aptitude eine alternative zu apt-get (Ubuntu) Befehle und sehr ähnlich zu verwenden.

sudo su

pwd

aptitude update

aptitude upgrade

aptitude clean

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Category: Linux

Linux ubuntu - static IP adress and IPv6

Created: 26 November 2012 | Written by vincent | Print | Email | Hits: 5436

sudo su
pwd
vi /etc/network/interfaces

# The primary network interface
auto eth0
iface eth0 inet static
        address 192.168.0.100
        netmask 255.255.255.0
        network 192.168.0.0
        broadcast 192.168.0.255
        gateway 192.168.0.1

if you have IPv6 then add... (this IPv6 adresse are example ask your ISP for your IPv6 adress)

### Start IPV6 static configuration
iface eth0 inet6 static
pre-up modprobe ipv6
address 2607:f0d0:2001:000a:0000:0000:0000:0010
netmask 64
gateway 2607:f0d0:2001:000a:0000:0000:0000:0001
### END IPV6 configuration