Razvan Draghici

Setting up a full Erigon Ethereum node on AWS - Part 4/4 Monitoring with Grafana and Prometheus

This post is part of a multi-series write-up about setting up Erigon on AWS. If you followed the previous posts, you should have a three instances running in your AWS VPC: one for the Ergion full Ethereum node, another one for the SSH bastion and the third for running the

Setting up a full Erigon Ethereum node on AWS - Part 3/4 Erigon and RPC Daemon

This post is part of a multi-series write-up about setting up Erigon on AWS. We previously looked at setting up the AWS infrastructure in a reproducible way using Terraform and also automated the creation of our admin users and security for all the Linux instance. Now we are ready to

Setting up a full Erigon Ethereum node on AWS - Part 2/4 Linux Security hardening with Ansible

This post is part of a multi-series write-up about setting up Erigon on AWS. Here we are focusing on securing the Linux boxes using a set of Ansible roles from DevSec - an open source project that compiles best-known guides for security like the NSA hardening guide or Deutsche Telekom

Setting up a full Erigon Ethereum node on AWS - Part 1/4 Terraforming AWS

If you're looking for a step by step guide on how to setup a full Ethereum node and get it ready for the merge, then you came to the right place. We will be deploying this on AWS using Terraform and Ansible, but the same setup (minus Terraforming) was tested

Cryptography in Elixir using Rustler

I recently started learning Rust and I didn't wait long to try writing a NIF library for Elixir. My toy project block_keys is using a C NIF for the libsecp256k1 library used to create Bitcoin (and similar) PKI and also sign transactions. Parity wrote a pure Rust implementation of

Distributed consensus with Raft

When working with distributed systems so many of the problems we're trying to solve boil down to managing state across multiple nodes. Whether it's replicating databases, mirroring message queues or achieving consensus in a blockchain network, the crux of the problem is keeping a distributed state machine in sync. Replication

Kubernetes WAF

Motivation I'm not going to attempt to properly define what a Web Application Firewall (WAF) is. I will just say this: unlike a traditional firewall that filters/routes ports & TCP packets, a WAF inspects the actual request/response data being communicated. This could be the Headers, HTTP query parameters, HTTP

Rails on Kubernetes - Part 3

Overview This is Part 3 of the Rails on Kubernetes series. * Part 1: Rails and Docker Compose [https://blog.cosmocloud.co/rails-on-kubernetes-part-1] * Part 2: Kubernetes [https://blog.cosmocloud.co/rails-on-kubernetes-part-2] * Part 3: Deployments, Rolling updates and Scaling Code If you don't want to read the previous posts and just follow

Rails on Kubernetes - Part 2

Overview This is Part 2 of the Rails on Kubernetes series. * Part 1: Rails and Docker Compose [https://blog.cosmocloud.co/rails-on-kubernetes-part-1] * Part 2: Kubernetes * Part 3: Deployments, Rolling updates and Scaling [https://blog.cosmocloud.co/rails-on-kubernetes-part-3] Updates * 2017-11-13: Updated all docker images to pull from Alpine. Code You can

Rails on Kubernetes - Part 1

Overview This is a lengthy topic that is split into multiple parts: * Part 1: Rails and Docker Compose * Part 2: Kubernetes [https://blog.cosmocloud.co/rails-on-kubernetes-part-2] * Part 3: Deployments, Rolling updates and Scaling [https://blog.cosmocloud.co/rails-on-kubernetes-part-3] Updates * 2019-09-29: Upgrade gems, few error fixes and Docker image versions * 2017-11-13: