Group Installations

On CentOS, RHEL and probably other rpm-based distributions, it is possible to install sets of packages that are teamed together in logical groups. These groups will install all packages that are required for a specific function.

You can get a list of available package groups with:

yum grouplist

You can get a description of a group and the list of the packages that will be installed with:

yum groupinfo 'Group Name'

...for example:

yum groupinfo 'SNMP Support'

Finally, you can install a group of packages with:

yum groupinstall 'Group Name'

GIMP Image Editor

  • Old GIMP Magazine issues can be found at: https://issuu.com/gimpmagazine

Is bandwidth still relevant for web hosting?

The Numix Project received some web love lately, mentioned in last Sunday's Linux Action Show web episode, and later on It's F.O.S.S and probably elsewhere, for their announcement to release their own Linux distribution. As a result, their website is now down, with the server returning 500:

mariosz@super-mario:~$ curl -I numixproject.org
HTTP/1.0 500 Internal Server Error

...and displaying the message "Bandwidth Limit Exceeded". I would have guessed that with everything-as-a-service and the whole Cloud #!, bandwidth consumtion would have already become irrelevant.

I mean, there's enough BW to feed our amplification attacks ( 400Gbps on CloudFlare, 350Gbps on OVH), but not enough to host our websites? Does that not call for a revision of the model?

RHCSA Notes and Links

This is an unsorted list of links for the RHCSA certification.


  • RHCSA/RHCE Red Hat Linux Certification Study Guide (Exams EX200 & EX300), Michael Jang, Certification Press
  • Hands-on Guide to the Red Hat Exams: RHCSA and RHCE Cert Guide and Lab Manual, Damian Tommasino, Pearson
  • RHCSA/RHCE Red Hat Linux Certification Practice Exams with Virtual Machines, Michael Jang, McGraw-Hill Osborne Media
  • Red Hat Certified System Administrator & Engineer: Training Guide and a Quick Deskside Reference, Asghar Ghori, Endeavor Technologies
  • Red Hat Enterprise Linux 6 Administration: Real World Skills for Red Hat Administrators, Sander van Vugt, SYBEX

See also

System V init

This is an unsorted list of links about System V init.

access-class (Cisco Command)

The access-class command applies an existing access list on a line, such as VTY and CON lines. The equivalent command for interfaces is ip access-group.

show vtp status (Cisco)

Notes on the show vtp status command on Cisco devices.

The value of configuration last changed by shows the source of the most recent updates to the Vlan list.

default interface (Cisco Command)

The default-interface command removes configuration from an interface, and returns it to its defaults. Note that by default, interfaces are not shutdown.

show vlan (Cisco)

show vlan lists the Vlans and the ports on which each is configured. Trunk ports don't show up in this list.

Vlans 1002, 1003, 1004 and 1005

In the output of the show vlan command, Vlans 1002, 1003, 1004 and 1005 are listed. Those exist by default to ensure interoperation and backwards compatibility of new devices with old and largely deprecated networks. For example, Vlans 1002 and 1004 were used on an old fiber optics type of network, whereas Vlan 1003 was used in token-ring networks. In the status column, those networks show up as either act/unsup or active/unsupported, since most new switches don't even have ports to use on those old types of networks any more.


Hello, I'm Marios Zindilis and this is my website. Opinions are my own. You also find me on LinkedIn and GitHub.

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