In the same IBM study cited before, the researchers found that Docker’s NAT doubled latency from roughly 35 µs to 70 µs for a 100-byte request from the client and 200-byte response from the application.
This does incur latency due to the network address translation (NAT) that must happen between the container’s local network and the host’s bridge network. By default, Docker lets you access the services running inside containers by creating a bridge network to the host. It should come as little surprise then that a study by researchers at IBM found that the CPU overhead of using Docker is negligible. A container runs on the host’s kernel and is basically just another process, albeit one with better isolation from other processes running on the host (it uses namespaces to accomplish this). In terms of CPU overhead, it helps to remember that, unlike a virtual machine, Docker does not require a layer of virtualization on top of the host operating system. So, the question is, what is the impact of running HAProxy inside of a container? You want your load balancer to be fast, with no added latency from the environment.
It also lends itself to easier software upgrades. That in turn makes deployment a repeatable and testable process. Starting, stopping, and removing a container are as easy as calling one-line docker commands. Lifecycle management becomes standardized too. When you deploy a container, you gain the ability to run an entire application complete with its runtime environment without ever actually installing it onto the host system. The service is completely contained within the container and all you need to do is start it and then map a TCP port to it.
Docker allows you to drop a container onto a host system and instantly get a running service-no install scripts, no installing C libraries. The benefits of Dockerĭo you want the ability to run HAProxy without needing to compile it, install dependencies, or otherwise alter your system?ĭocker containers bring considerable benefits, chief among them being less ceremony around installation and execution.
The commands I demonstrate were performed on a Linux workstation, but will work just as well when using Docker Desktop for Windows or Docker Desktop for Mac. I will be using those images in this blog post. These are updated regularly with the latest patches and security updates. HAProxy Technologies builds its own set of Docker images under its namespace haproxytech.
Note that we are covering how to run HAProxy, not the HAProxy Kubernetes Ingress Controller. In this blog post, you’ll learn why you might consider running HAProxy inside a container and what the ramifications could be. Why would you want to run your load balancer inside of a Docker container? Are their performance penalties when doing so? Will it introduce any security issues? As a standalone service that runs on Linux, porting it to Docker certainly seemed natural. Pardon the cliché, but HAProxy was born for this. This is the host configuration which enables to run any container as non-root user on the host.Can you run HAProxy as a Docker container? Yes! Did you even need to ask? Docker is ubiquitous these days and you’ll find that many applications have been Docker-ized the HAProxy load balancer is no exception.
This option can be used if the image doesn’t have its own user. "HERE DO WHAT YOU HAVE TO DO AS A ROOT USER LIKE INSTALLING PACKAGES ETC." RUN groupadd -r myuser & useradd -r -g myuser myuser This can be accomplished in different ways: In addition, configuring container to user unprivileged is the best way yo prevent privilege escalation attacks. This is because if a user manages to break out of the application running as root in the container, he may gain root user access on host. One of the best practices while running Docker Container is to run processes with a non-root user. Running Docker Containers as ROOT: | dockerlabs Star Fork Watch Follow Running Docker Containers as ROOT: Docker - Beginners | Intermediate | Advanced View on GitHub Join Slack Running Docker Containers as ROOT: