Whatever expressed in this blog is strictly my own opinion. They do not reflect any other entity 'am associated with. The comments expressed by the blog viewers are their opinion they do not necessarily reflect mine.

Openstack dashboard release IP for project/tenant

This took me couple of hours to figure it out in UI. Hence documenting:

To release floating IPs from a tenant or project of openstack.

  1. Login to dashboard
  2. Compute –> Access & Security –> Floating IPs
  3. You should can sort by Status (‘Down’)
  4. Select the ones with pt 3 and click on ‘Release Floating IPs’ button
  5. You should see that these floating IPs are released for other tenants to pickup.
Categories: General


The opensource project I’ve been actively working on. I took a video today on this.



Categories: General

Connecting two Open vSwitches to create a L2 connection between sites

Remi Bergsma's blog

Recently I played with Open vSwitch and it’s awesome! Open vSwitch is a multilayer virtual switch and it brings a lot of flexibility in the way you can create interfaces and bridges in Linux. It’s also a Linux distribution independent way to configure these things. Switching in software!

To create a bridge, simply run:

You can also create another bridge on top of it, to handle a VLAN for example:

Even better, create a bond based on LACP:

This is all quite nice but still basic. It gets interesting when you realise you can connect two switches like you can put a patch cable between physical switches. To test how cross platform this works, I setup two boxes: a CentOS 7 box and a Ubuntu 15.04 one. This shows it in a picture:


We’ll create a new bridge and add a vxlan interface that connects to the other vswitch. Then create a…

View original post 871 more words

Categories: General

The need for Network Overlays – part II

Categories: General

Adding ssh-keygen manually

February 23, 2017 Leave a comment

test@testenv:/# ssh-keygen -t rsa -b 4096 -C "karun.chennuri@test.com"
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa):
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /root/.ssh/id_rsa.
Your public key has been saved in /root/.ssh/id_rsa.pub.
The key fingerprint is:
90:b9:6d:84:9e:bc:71:80:19:12:ec:e4:5d:51:11:dc karun.chennuri@test.com
The key's randomart image is:
+--[ RSA 4096]----+
| .o.. .+++ |
| o. +.+. E |
| + .o.* . |
| o .o B |
| * S |
| = |
| . |
| |
| |

test@test-env:~$ ssh-add
Could not open a connection to your authentication agent.

# If you see above error then
$ eval 'ssh-agent -s'
SSH_AUTH_SOCK=/tmp/ssh-pxa9H7geUdOJ/agent.31326; export SSH_AUTH_SOCK;
echo Agent pid 31327;

$ SSH_AUTH_SOCK=/tmp/ssh-pxa9H7geUdOJ/agent.31326; export SSH_AUTH_SOCK;
$ SSH_AGENT_PID=31327; export SSH_AGENT_PID;

# Then again issue below command ssh-add this time it should work...

test@testenv:/# ssh-add -l
The agent has no identities.
test@testenv:/# ssh-add
Enter passphrase for /root/.ssh/id_rsa:
Identity added: /root/.ssh/id_rsa (/root/.ssh/id_rsa)
test@testenv:/# ssh-add -l
4096 90:b9:6d:84:9e:bc:71:80:19:12:ec:e4:5d:51:11:dc /root/.ssh/id_rsa (RSA)

Categories: General

VNCServer setup (Ubuntu desktop)

February 14, 2017 Leave a comment

Steps to Install VNCServer on any VM

ubuntu@karun-sec-4:~$ apt-get update
ubuntu@karun-sec-4:~$ apt-get install -y gnome-core xfce4 xfce4-goodies vnc4server tightvncserver

# If the folder .vnc not found, go ahead and create it manually & also xstartup file
ubuntu@karun-sec-4:~$ vi ~/.vnc/xstartup


gnome-panel &
gnome-settings-daemon &
metacity &
nautilus &
gnome-terminal &
startxfce4 &

# If the folder .config not found, go ahead and create it manually
ubuntu@karun-sec-4:~$ sudo chown -R ubuntu:ubuntu ~/.config

#If gray screen
sudo chown ubuntu:ubuntu ~/.vnc/xstartup
chmod 755 ~/.vnc/xstartup

ubuntu@karun-sec-4:~$ vncserver -geometry 1920x1080 -depth 24 :1

# TightVNC client open and
<ip address>::5901

password: <password>

Now click on connect button

#Note: to kill VNCserver
ubuntu@karun-sec-4:~$ vncserver -kill :1

Categories: General

Steps to create a new Interface on Ubuntu 14.04 VM of Openstack

February 9, 2017 Leave a comment

In your ubuntu VM execute steps 1 and 2 below
1. Add new /etc/network/interfaces.d/eth1.cfg
auto eth1
iface eth1 inet dhcp

2. sudo /etc/init.d/networking restart
Login to openstack dashboard now
3. On your instance select “Attach Interface” (In the popup chose a new network interface that you may’ve configured already)

4. Restart VM now, you should see your eth1 pick up an internal IP from the network.
Categories: General

My top security predictions for 2017

January 30, 2017 Leave a comment

My Top predictions for Cloud:
DoS/DDoS: More and more enterprises are joining public cloud for shifting production workloads from internal data centers to Cloud that’s managed by various cloud providers. Attackers are constantly hunting for innovative ways to bring down the services. Considering the history of disruptions (5-hour outage of AWS, Dyn’s DNS infrastructure disrupting Twitter/Spotify/AWS etc) there are potential outages to happen in the next year too.
Software Defined Networking: Insecure configuration of Control and Data Plane Layers will open the doors for the attackers to disrupt your hybrid cloud, private cloud environment. Most of the time teams that configure or manage SDN are not Security folks, hence the risk is double!
Ransomware: Malicious software designed to block access to the victim’s files until the victim pays a ransom in Bitcoin is a potential threat that we can see a rise in the next year. With the advent of cloud-based services, this is going to be increasingly common threat next year.
Data Loss/Leakage: Growing volumes of sensitive data in the cloud will invite hackers. Trust no one should be the principle to adopt. Strict Key Management Systems (KMS) should be adapted for data at rest and use Transport Layer Security for data in motion.
My Top predictions for Enterprise-level:
Mobile Malware: Facing this age old problem that always surfaces with a new face is quite a daunting task! At the enterprise level – effective antivirus products and malware defenses can combat malware to a larger extent. But the problem is with mobile devices joining the corporate internal wireless network are becoming soft targets! Attacks such as memory-resident malware is an emerging trend and forensically difficult to detect. Take a note of that!
My Top predictions for Home User:
IoT (Internet of Things): With the advent of Siri and Alexa, Privacy of individuals is undoubtedly a big challenge. This “always on” feature is a bit disturbing fact, though! Though security standpoint of this product is still unclear, but few experts say the product is secure with no obvious backdoors, however, only the times to come will decide the security posture of such products till hacked or especially in cases where software updates/patching flow-in opening the back doors. IoT is next big thing to lookup and a possible source of cyber attacks!
Categories: General

2017 Cyber Security Trends – 20 Professionals Speak Out

January 30, 2017 Leave a comment

VeriClouds recently polled a field of Cyber Security professionals to get their opinions on the predominate threat trends in 2017. Our experts are CEO’s, CISOs, Engineers, Security Architects and Consultants working in universities, private consulting firms and corporations. Cyber Security 2017 Summary All responses, including those persons wishing to remain anonymous, were considered in writing […]

Source: 2017 Cyber Security Trends – 20 Professionals Speak Out

Categories: General

Limitations with Kubernetes Secrets

December 29, 2016 Leave a comment

I’ve been working in Kubernetes space for quite some time now and ‘ve been coding in Go and directly contributing to this project in opensource world. Well coming to the subject of this blog, I would like to touch base here on a loosely designed object i.e. “secret store” in kubernetes. This topic has been a center of discussion in various forums, ‘am just trying to re-echo their voice in this blog.

Right now Kubernetes stores it’s secrets in etcd under /registry/secrets location. All the secrets are just base64 encoded and stored in etcd. This is what is the primary risk that security guys like me have been barking about. Now is there a way to get out of this issue? Yes but with a possible enhancement i.e. to externalize the secret store from Kubernetes system to something like HashiCorp’s HashiVault or Barbican coupled with Hardware Security Module (HSM).

Following are few risks adapting secret store mechanism in K8s:

  1. API server secret data is stored as plaintext (base64 encoded only) in etcd
  2. Secrets are shared if multiple replicas of etcd are run
  3. root on any node can read any secret from the api server
  4. User creating a pod that uses secret can also see the value of that secret
  5. No secret store access control at Kubernetes cluster level
  6. Key max length of 253 chars, Secret value <= 1MB. It is possible to accidentally push the Secrets definition to version control

Here is the change that ‘am looking for…It can be Barbican or HashiVault…



Currently there is no plug-in to K8S that can help externalize the secret store to Hashi Vault or Barbican. I developed one for both HashiVault and Barbican, I will upload the github link soon for it.

Categories: General