Dana Bull, Leostream

Dana Bull is a marketing specialist with vendor-independent software company Leostream. We recently checked in with Dana to learn more about Leostream and how companies are embracing virtualization today. Here’s what she had to say:

Can you tell us about Leostream. What are you known for? 

Leostream is a driver in the evolving virtualization space and a leader in the management of end-user resources hosted in the data center. Our connection broker product provides a comprehensive and scalable solution for organizations to deliver and manage desktops, remote sessions and hosted applications to end-users. It’s our flexibility to support the multiple technology stacks you typically find across large enterprises that makes us crucial to the success of deployments and well-known. Our solution is the most widely deployed vendor neutral connection broker on the market today. 

What are the most common pain points your clients come to you with? How do you help them? 

More often than not, our customers seek us out when they are stuck. They need to integrate a piece of technology that no one else can. Or, they want to future-proof their design. We provide tools that allow our customers to manage user assignments and connections to hosted desktop environments in whatever platform they choose, whether they want a virtual or physical infrastructure, a publicly or privately hosted data center, a Windows or Linux operating system, or any of a number of high-performance display protocols. 

Why are companies embracing virtual operating systems more? What are the advantages? 

The advantages of moving to a virtual environment are well documented. Hosting desktops in the datacenter improves data security, allows organizations to save power, and centralizes desktop management. These benefits are particularly important in verticals such as healthcare and financial services. By keeping data secure in the data center, organizations are at a lower risk for losing data due to end-point loss or breech. 

What types of industries seem to be the most interested in VMware? 

We manage some of the world’s largest hosted desktop deployments in banking, government, oil and gas, healthcare, and education. VMware is a common technology that we support in many of these industries. 

What are some of the innovative ways you’ve seen it being used? 

Over the years, we’ve had some interesting use cases and environments present themselves. Some of the innovative ways that we’ve seen recently are around hybrid deployments. For example, customers have built out solutions on-site and then bursting into the cloud to support peak demand. 

What considerations should companies make when introducing virtualization? What precautions should they take? 

Your hosted desktop environment, whether it is a virtual desktop infrastructure (VDI) or a physical hosted desktop infrastructure (HDI), needs to be robust, highly resistant to failure, and flexible enough to meet individual user needs, but there are a host of other questions that need to be addressed in order to ensure a successful VDI rollout.Here are five items that need to be be considered before transitioning to a large-scale VDI deployment: 

1. A plan for handling multiple technologies and mixed physical/virtual environments. 

2. What display protocol will you use? Do you need more than one? 

3. How will you handle directory services and authentication. 

4. What type of granular control do you need over the desktops? 

5. How do you want to map users to the resources? 

What advice do you find yourself repeating to clients over and over about using VMWare? 

The connection broker OVA-file can be used with VMware vSphere 5.x or 6.x, or VMware Workstation 9 or higher. We always recommend keeping the software up-to-date in order to take advantage of new features as they become available.

What virtualization trends or innovations are you following right now? What excites you about them? 

We are seeing a lot of interesting trends taking shape. From Linux VDI and OpenStack virtual desktops, to public cloud deployments and container technology, these trends are turning heads. We recently published a whitepaper which goes into depth about these topics and can be downloaded from our website.Sign up for Snapwatcher.

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Use Case - Tamper-resistant Clinical Trials


Blockchain PoCs were unsuccessful due to complexity and lack of developers.

Still the goal of data immutability as well as client verification is a crucial. Furthermore, the system needs to be easy to use and operate (allowing backup, maintenance windows aso.).


immudb is running in different datacenters across the globe. All clinical trial information is stored in immudb either as transactions or the pdf documents as a whole.

Having that single source of truth with versioned, timestamped, and cryptographically verifiable records, enables a whole new way of transparency and trust.

Use Case - Finance


Store the source data, the decision and the rule base for financial support from governments timestamped, verifiable.

A very important functionality is the ability to compare the historic decision (based on the past rulebase) with the rulebase at a different date. Fully cryptographic verifiable Time Travel queries are required to be able to achieve that comparison.


While the source data, rulebase and the documented decision are stored in verifiable Blobs in immudb, the transaction is stored using the relational layer of immudb.

That allows the use of immudb’s time travel capabilities to retrieve verified historic data and recalculate with the most recent rulebase.

Use Case - eCommerce and NFT marketplace


No matter if it’s an eCommerce platform or NFT marketplace, the goals are similar:

  • High amount of transactions (potentially millions a second)
  • Ability to read and write multiple records within one transaction
  • prevent overwrite or updates on transactions
  • comply with regulations (PCI, GDPR, …)


immudb is typically scaled out using Hyperscaler (i. e. AWS, Google Cloud, Microsoft Azure) distributed across the Globe. Auditors are also distributed to track the verification proof over time. Additionally, the shop or marketplace applications store immudb cryptographic state information. That high level of integrity and tamper-evidence while maintaining a very high transaction speed is key for companies to chose immudb.

Use Case - IoT Sensor Data


IoT sensor data received by devices collecting environment data needs to be stored locally in a cryptographically verifiable manner until the data is transferred to a central datacenter. The data integrity needs to be verifiable at any given point in time and while in transit.


immudb runs embedded on the IoT device itself and is consistently audited by external probes. The data transfer to audit is minimal and works even with minimum bandwidth and unreliable connections.

Whenever the IoT devices are connected to a high bandwidth, the data transfer happens to a data center (large immudb deployment) and the source and destination date integrity is fully verified.

Use Case - DevOps Evidence


CI/CD and application build logs need to be stored auditable and tamper-evident.
A very high Performance is required as the system should not slow down any build process.
Scalability is key as billions of artifacts are expected within the next years.
Next to a possibility of integrity validation, data needs to be retrievable by pipeline job id or digital asset checksum.


As part of the CI/CD audit functionality, data is stored within immudb using the Key/Value functionality. Key is either the CI/CD job id (i. e. Jenkins or GitLab) or the checksum of the resulting build or container image.

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