How to check which local device is assigned to which iscsi disk in linux

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By listing linked devices in /dev:


root@pluto:~# ls -la /dev/disk/by-path/*iscsi*
lrwxrwxrwx 1 root root  9 Dec  6 14:13 /dev/disk/by-path/ip-9.6.9.3:3260-iscsi-iqn.2014-07.ro.gz.sun:backups-btrfs-lun-0 -> ../../sdb
lrwxrwxrwx 1 root root  9 Dec  6 14:39 /dev/disk/by-path/ip-9.6.9.3:3260-iscsi-iqn.2014-07.ro.gz.sun:pluto-lun-0 -> ../../sdd

Debian Heartbeat: deal with STONITH errors when configuring CRM cluster

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STONITH is short for "Shoot The Other Node In The Head". It's a technique for fencing in computer clusters.

Fencing is the isolation of a failed node so that it does not cause disruption to a computer cluster. As its name suggests, STONITH fences failed nodes by resetting or powering down the failed node.

Multi-node error-prone contention in a cluster can have catastrophic results, such as if both nodes try writing to a shared storage resource. STONITH provides effective, if rather drastic, protection against these problems.

How to install python 2.7 on Red Hat Enterprise Linux Workstation release 6.5 (Santiago)

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Red Hat Enterprise Linux Workstation release 6.5 (Santiago) comes with python 2.6 and if you want to install 2.7 you will discover you do not have it on repository.

All you have to do is:

1. Add python 2.7 repository:


sudo sh -c 'wget -qO- http://people.redhat.com/bkabrda/scl_python27.repo >> /etc/yum.repos.d/scl.repo'

How to add an ISCSI disk on linux server

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So you have configured a brand new iscsi disk and want to put it to use in linux client?
No problem, read below!

Note: in our example, the ISCSI server is on 192.168.69.66

1. Discover the disks:

venus:~# iscsiadm -m discovery -t sendtargets -p 192.168.69.66
192.168.69.66:3260,3 iqn.2014-07.ro.gz.sun:swap-venus

2. activate them:

venus:~# iscsiadm -m node --login -p 192.168.69.66
Logging in to [iface: default, target: iqn.2014-07.ro.gz.sun:swap-venus, portal: 192.168.69.66,3260]

Check Activation Lock Status on iOS Devices via Apple iCloud Website

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If you want to buy a new iPhone second hand, make sure you check it before paying up as you can do nothing with it if it's locked to another apple id.

Up until now there was no page to check if the device is locked or not. Apple has released the "Activation Lock Status" tool which is accesible via iCloud.com which alows users to enter a Device IMEI or Serial Number to check it's activation lock status.





Shellshock - Bash Code Injection Vulnerabilty (CVE-2014-6271)

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Security researchers from Red Hat have uncovered a new exploit in the common "Bash" command shell found in OS X, Linux, AIX and many other *nix platforms which can be used to deploy malicious code with minimal effort. Due to the ubiquity of the Bash shell, the exploit can also affect a wide variety of different web-connected devices and properties, including unsecured websites, smart home appliances, servers, and more.

As mentioned above, this vulnerability is not limited to only one platform but in the same time in doesn't affect the average consumer because even if they have "bash" in their computers, they do not use it in a way that it can be vulnerable. Unless you are using your computer as a server that accepts commands from untrusted sources (like web servers for example) (and then only if it sets environment variables based on commands from untrusted sources) you do not have to worry about.

Networking ABC - questions and answers

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Define Network?


A network is a set of devices connected by physical or virtual media links.
A network is a connection of two or more nodes via a physical or virtual link but also two or more networks connected by one or more nodes.

What is a Link?


Link is the virtual or physical medium used to connect two or more computers.

What is a node?


Taking as example the response from the question above, the computers are called Nodes.

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