Recipe: how to mount external RAID-LVM disk
I usually install Debian machines with software RAID and LVM, until today I have not needed to recover one disk from outside the the system. It is a little bit trick, I decide to make this post for my...
View ArticleRecipe: How to password recovery a Linux Amazon Ec2 instance
Imagine you have an Amazon Ec2 instance, and you miss your ssh keys, and passwords. How can you execute a password recovery? That is easy, mount your disk on other machine to do that. First a t all you...
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How to install Debian in Sony VAIO VPCYB2M1E
As a Debian fan, I always want to install my favourite Linux distro Debian, on my personal laptop. Some months ago my wife give as a present a fantastic laptop a Sony VAIO VPCYB2M1E, It is a AMD E-350...
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Lego WeDo with Debian Wheezy using scratch
I bought a Lego WeDo set for my son, this set is composed by some lego technic pieces and a Hub with USB where you can connect a motor and two sensors, distance and tilt. This set works natively with...
View ArticleObserving apache logs for Troubleshooting
Normaly when you are troubleshooting an Apache server you are checking parameters that don’t have monitors for them. With the “observate” aproach the best place too look at is: # tail -f...
View ArticleExternal web monitoring pitfalls
Today society requires services available 24×7, IT management requires knowledge of the state of the services offered. This necessity have created a lot of tools, products and services. The main...
View ArticleHow to see how many entries per minute we have on a log
On this post We are going to explain a tip used to count log entries in order to compare load of a specific entries. Let’s explain it: We have a web server log, for example: 179.158.24.43 - -...
View ArticleHow to monitor changes on the Amazon AWS firewall rules
If you have your cloud infraestructure on Amazon AWS for audit and control purposes you may want monitor when the firewall rules of any of your security groups have changed. With this script you will...
View ArticleOutgoing SMTP server monitoring
Mail service monitoring is not as easy as web monitoring, even outgoing smtp is more difficult to monitorize. We can summarize some service problems and how to monitorize them: Mail is not being...
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Let’s encrypt automation on Debian
Free SSL certificates for everyone! the https://letsencrypt.org/ initiative backed by Akamai, Cisco, Mozilla and EFF, is going to offer free certificates. On this post I am going to explain how I have...
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How to install Debian Linux with dualboot on Lenovo Yoga 900s
Initially It was not posible to install Linux on Lenovo Yoga 900s ( Yoga 900S-12ISK) due a non standard Harddisk access method. It was thought that Lenovo had a plot with Microsoft to avoid Linux to be...
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