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vmktree: disable root ssh password logins in VMware ESXi 4.1

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vmktree is a free web tool that shows you the graphs of resource usage of VMware ESX Server, VMware Server (on Linux), GSX Server (on Linux) and a few other data center devices (ilo/ilo2/rsa2/ds4000).

Currently, it is not possible to use vmktree with a VMware ESXi 4.1 host with ssh root logins disabled. . . . → Read More: vmktree: disable root ssh password logins in VMware ESXi 4.1

VMware ESXi: always keep another Administrator user other than root

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I had to assign permissions to group “root” as a host Administrator of my ESXi. I was a little bit distracted and assigned the “Read-only” role to group “root” instead of role “Administrator”. As a side effect, user “root” got read-only permissions!

User “dcui” is Administrator by default, so we can use it . . . → Read More: VMware ESXi: always keep another Administrator user other than root

Selectively allow SSH for users in VMware ESXi

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In another post, I explained how to disable root ssh login and allow regular users to login to the ESXi. It is also possible to selectively allow SSH for a particular set of users.

Create the security map

We need to create a map file to specify how to authenticate (or deny) users.

. . . → Read More: Selectively allow SSH for users in VMware ESXi

SSH with non-root users in VMware ESXi

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The default configuration in VMware ESXi 4.1 allows ssh login only for root. On the other hand, preventing root ssh login is part of any OS hardening checklist. In this article, I will explain how to access an ESXi server with non-root users and how to prevent root ssh login.

I’ll show how . . . → Read More: SSH with non-root users in VMware ESXi

SSH client in VMware ESXi 4.1

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By default, the “ssh” command does not exist in ESXi 4.1.

To create it, login as root and execute the following command:

ln -s /sbin/dropbearmulti /bin/ssh

Now you have the ssh client available from the command line.

Change keyboard layout in a Linux terminal

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This is kind of a reminder for myself because I never remember this when I need it

To change the keyboard layout (e.g. to Spanish) in the Linux command line, type the following command:

# loadkey es

That’s all!

Hackergotchi howto

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Recently, the guys at Planet Sugar asked me to add a hackergotchi. After finding out what a hackergotchi is, I created my own. Here’s how I did it using GIMP in Ubuntu.

This guide is based on this article, with some additional explanations for GIMP newbies (like me).

Step by step guide

1) . . . → Read More: Hackergotchi howto

MS Windows 2008 password recovery

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Recently, I had to login as the local Administrator in a MS Windows 2008 server. Guess what: nobody knew the local Administrator password. This happens pretty often when a MS Windows host is part of a Windows domain because administrators usually login as the domain Administrator and rarely use the local admin user.

. . . → Read More: MS Windows 2008 password recovery

PayPal donations in WordPress

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Sometimes, a good post may raise your blog popularity and you may experience some hundreds of hit rates. From those hundreds of Internet users, dozens of them may find the information they were looking for, which will surely make them happy. Some of these happy people will also be grateful and may want . . . → Read More: PayPal donations in WordPress

CeibalJAM! awarded in Prix Ars Electronica 2010

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CeibalJAM! has been awarded in the prestigious Prix Ars Electronica 2010 with an Honorary Mention in the Digital Communities category.

To have an idea of the relevance of this award, I can only say that the movie Avatar got the same award in the “Computer Animation / Film / VFX” category.

. . . → Read More: CeibalJAM! awarded in Prix Ars Electronica 2010