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Kubernetes at Home with K3s
4 projects | news.ycombinator.com | 5 Dec 2021
That's a false statement as far as the technical aspects are concerned (Swarm is still usable and supported), but is a true statement when you look at the social aspects (Kubernetes won the container wars and now even Nomad is uncommon to run into).
Right now the company i'm in uses Swarm in a lot of places due to its simplicity (Compose file support) and low resource usage - Swarm hits the sweet spot when it comes to getting started with container orchestration and doing so without needing multiple people to wrangle the technical complexity of Kubernetes, or large VMs to deal with its resource usage, at least in on prem environments.
In combination with Portainer (https://www.portainer.io/) it's perhaps one of the best ways to get things done, when you expect everything to just work and aren't doing something too advanced (think along the lines of 10 servers, rather than 100, which is probably most of the deployments out there).
I actually wrote about some of its advantages in my blog post, "Docker Swarm over Kubernetes": https://blog.kronis.dev/articles/docker-swarm-over-kubernete...
That said, if there are any good options to replace Swarm, it has to either be Hashicorp Nomad (https://www.nomadproject.io/) which is a really nice platform, especially when coupled with Consul (https://www.consul.io/), as long as you can get past the weirdness of HCL. Alternatively, it has to be K3s (https://k3s.io/), which gives you Kubernetes without the insane bloat and hardware usage.
I actually benchmarked K3s against Docker Swarm in similar app deployments: 1 leader server, 2 follower servers, running a Ruby on Rails app and an ingress, while they're under load testing by K6 (https://k6.io/). I was attempting to see whether COVID contract tracking with GPS would be viable as far as the system load goes in languages with high abstraction level, here's more info about that: https://blog.kronis.dev/articles/covid-19-contact-tracing-wi...
Honestly, the results were pretty close - on the follower servers, the overhead of the orchestrator agents were a few percent (K3s being heavier, but a few dozen MB here or there not being too relevant), whereas the bigger differences were in the leader components, where K3s was heavier almost by a factor of two, which isn't too much when you consider how lightweight Swarm is (there was a difference of a few hundred MB) and the CPU usage was reasonably close in both of the cases as well. Sadly, the text of the paper is in Latvian, so it's probably of no use to anyone, but i advise you to do your own benchmarks! Being a student, i couldn't afford many servers then, so it's probably a good idea to benchmark those with more servers.
Of note, on those VPSes (4 GB of RAM, single core), the full Kubernetes wouldn't even start, whereas at work, trying to get the resources for also running Rancher on top of a "full" Kubernetes cluster (e.g. RKE) can also take needlessly long due to the backlash from ops. Also, personally i find the Compose syntax to be far easier to deal with, rather than the amalgamation that Kubernetes uses, Helm probably shouldn't even be a thing if the deployment descriptors weren't so bloated. Just look at this: https://docs.docker.com/compose/compose-file/compose-file-v3...
- Docker Swarm is pretty good when you're starting out with containers and is reasonably stable and easy to use
Creating GCP disk images with (for?) TerraForm
1 project | reddit.com/r/devops | 23 Nov 2021
Also if you don’t want to look at kube then check out Nomad. https://www.nomadproject.io/
Is cloud native getting a bit too complex?
1 project | reddit.com/r/sre | 10 Nov 2021
Hahaha sure: https://www.nomadproject.io it’s by HashiCorp.
De docker para Kubernetes
1 project | reddit.com/r/devpt | 4 Nov 2021
An Update on Our Outage
3 projects | news.ycombinator.com | 31 Oct 2021
Creating my personal cloud with HashiCorp
6 projects | news.ycombinator.com | 30 Oct 2021
Yeah, this pains me too. Here's a relevant issue to keep an eye on:
I've used an nginx-based S3 proxy in the past to get around this. Not ideal but it works.
Datadog Reveals Hidden AWS Performance Problems
2 projects | dev.to | 25 Oct 2021
At Lob, we currently use Convox as our deployment platform, a “roll your own Platform-as-a-Service” that you can install to handle container orchestration on AWS’s ECS (Elastic Container Service). Convox is showing its age and this year we began the process of replacing Convox with HashiCorp’s Nomad, a flexible workload orchestrator to deploy and manage our containers on AWS.
How are you guys deploying containers?
1 project | reddit.com/r/homelab | 3 Oct 2021
its an orchestration tool similar to something like K8S https://www.nomadproject.io/
Podman in Linux
7 projects | news.ycombinator.com | 28 Sep 2021
That does seem better! Of course, there are a few lingering issues with support, but overall the trend is good: https://github.com/containers/podman/issues?q=is%3Aissue+is%...
Of course, there's no Swarm support, as evidenced by that very article:
> One known caveat is that Podman has not and will not implement the Swarm function. Therefore, if your Docker Compose instance uses Swarm, it will not work with Podman.
Feels like people will either be pigeonholed into Kubernetes for all of their deployments, or will have to migrate over to something like Hashicorp Nomad: https://www.nomadproject.io/
Curiously, it also supports Podman as a task driver: https://www.nomadproject.io/docs/drivers/podman
Which tool do you use to run scripts?
1 project | reddit.com/r/devops | 8 Sep 2021
I'm not sure I understand the situation here, but for something like running one-off / batch jobs across nodes, that sounds like something nomad should cover, or maybe Ansible depending on what you need.
__salt__ is not defined
2 projects | reddit.com/r/saltstack | 21 Oct 2021
Have a look at https://github.com/saltstack/salt/tree/master/tests/pytests/unit and https://docs.saltproject.io/en/latest/topics/development/tests/unit.html
Peculiarities of SaltStack
1 project | reddit.com/r/saltstack | 11 Aug 2021
I've opened a ticket: https://github.com/saltstack/salt/issues/60710 but a salt employee has marked it as expected behaviour which means they expect that all commands are sent to every minion even if they don't match and that's expected.
Upcoming trends in DevOps and SRE
8 projects | dev.to | 20 Jul 2021
Release phase - Saltstack, HashiCorp Vault.
Add value to key-value type of line
1 project | reddit.com/r/saltstack | 13 Jul 2021
Salt orchestration mixing the minions
1 project | reddit.com/r/saltstack | 29 Jun 2021
The most likely cause is this long standing bug: https://github.com/saltstack/salt/issues/54045
How do I force salt-ssh to use /usr/bin/python3.8 without changing the /usr/bin/python3 symlink?
2 projects | reddit.com/r/saltstack | 15 Jun 2021
Is there a vanilla configuration testing setup?
1 project | reddit.com/r/saltstack | 27 May 2021
However, I can't seem to find any resources about how to initialize the tests directory so it actually runs. There's https://github.com/saltstack/salt/tree/master/tests, but it appears to have way more than what you need to get started...
Struggling with parsing yaml
1 project | reddit.com/r/saltstack | 26 May 2021
Hi, I need to manage a .yaml file which has a list of users and associated ip's / ports. I attempted to use file.serialized, however the way I structured my .yaml file file.serialize throws an exception because it contains a list as the first item (github.com/saltstack/salt/issues/41209). My original structure was:
1 project | reddit.com/r/saltstack | 20 May 2021
How to pass variables to Azure VM extension for Linux?
2 projects | reddit.com/r/AZURE | 5 Apr 2021
What are some alternatives?
Rundeck - Enable Self-Service Operations: Give specific users access to your existing tools, services, and scripts
k3s - Lightweight Kubernetes
Dkron - Dkron - Distributed, fault tolerant job scheduling system https://dkron.io
Cloud-Init - unofficial mirror of Ubuntu's cloud-init
Ansible - Ansible is a radically simple IT automation platform that makes your applications and systems easier to deploy and maintain. Automate everything from code deployment to network configuration to cloud management, in a language that approaches plain English, using SSH, with no agents to install on remote systems. https://docs.ansible.com.
kubernetes - Production-Grade Container Scheduling and Management
Docker Compose - Define and run multi-container applications with Docker
gocelery - Celery Distributed Task Queue in Go
dapr - Dapr is a portable, event-driven, runtime for building distributed applications across cloud and edge.