Who doesn´t know the situation that you need to copy a single file from your local computer to an ESXi host or vice versa, but your firewall is blocked, ssh disabled or scp is just damn slow.

Funny enough, there is a simple yet powerful way of copying data from any system to any system, not just ESXi. It might even run on a mobile?!?

The only thing you need is a standard python installation as the required library comes automatically with it.

But here is the command: 

python -m SimpleHTTPServer

Looks simple, right! That command opens up a low weight HTTP server that starts with its root folder within the directory the command is started. 

data transfer for VMware ESXi - start HTTP server

Port Warning 8000

I use port 8000 in this example as this port is used for vMotion and therefore mostly opened and permitted within the built in ESXi firewall at any time. Please make sure to check, that you use a port that is not used by any other service at the same time (you can expect an error message, that the port is in use) and that there is no vMotion process ongoing or planned while having this server active. In our demo environment vMotion is not possible, therefore I don´t expect any vMotion transfer, yet the port is always open.

To be on the safe side, you should open and use a different port, like 57007, that is less common to be used.

Firewall ESXi

Start the server

That means, if start python -m SimpleHTTPServer 8000 while within the /usr folder, I can access all files and traverse into all subdirectories. Clicking on a directory lets me walk into it, clicking a file downloads or opens it in the browser. There is no authentication needed and the server runs under the permissions of the logged in user that starts the command.

Access filesystem using HTTP Server


  • no installation needed for most linux based systems
  • very versatile
  • secure, when used on demand
  • extremely fast data transfer

As there is no network protocol encryption done during the whole communication and the http server very lightweight, the data transfer is extremely fast. Compared to SCP data transfer you can easy reach 5-10 times speed improvements.


As you open up an incoming port you need to make sure, that there is no firewall blocking that port on the system the python command is started. Furthermore, to start the command you need to have access to SSH on your ESXi host.


Of course, you should never run that server continuously or even permanent as it opens up a massive security leak (cleartext and no authentication). But used temporary to copy some files and closed afterwards is perfect.

Metrics and Logs

(formerly, Opvizor Performance Analyzer)

VMware vSphere & Cloud

Monitor and Analyze Performance and Log files:
Performance monitoring for your systems and applications with log analysis (tamperproof using immudb) and license compliance (RedHat, Oracle, SAP and more) in one virtual appliance!

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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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