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AKOMLJEN.COM
ROOK: CLOUD NATIVE ON-PREMISES PERSISTENT STORAGE FOR The block storage (think of EBS) is what will probably be more interesting to you. Each time you create a Kubernetes Persistent Volume Claim or PVC, the Ceph will create the new volume. The main component responsible for block storage is Ceph OSD along with Ceph MON which provides cluster membership, configuration, and state. KUBERNETES PERSISTENT VOLUMES WITH DEPLOYMENT AND STATEFULSETSEE MOREON AKOMLJEN.COM
INSTALLING KUBERNETES DASHBOARD PER NAMESPACESEE MORE ON AKOMLJEN.COM KUBERNETES API RESOURCES: WHICH GROUP AND VERSION TO USE?SEE MORE ONAKOMLJEN.COM
KUBERNETES ENVIRONMENT VARIABLES PROTECT KUBERNETES EXTERNAL ENDPOINTS WITH OAUTH2 PROXYSEE MORE ONAKOMLJEN.COM
MOVING THE REMOTE TERRAFORM STATE ITEMS Due to recent refactoring, I figured out that I need to move some Terraform state items from one S3 path to another. And then to merge configurations with other stuff at the destination directory. Terraform can move state items around, but this feature doesn't work with remote states. Here isKUBERNETES TIPS
Kubernetes Tips - Part 1. Working with Kubernetes can be hard at the beginning. It is a complex orchestrator and you will probably spend a lot of time dealing with or finding a solution for a particular problem. I do the same, and I decided to write a series of posts which will cover different Kubernetes features. AN EASY WAY TO TRACK NEW RELEASES ON GITHUB As a software developer, you need to keep track of many projects/tools hosted on GitHub. While GitHub has a watch feature, I found it too noisy. I open GitHub notifications once in a year, or maybe less. If you like GitHub notifications, great, you can watch a repo only KUBERNETES CONTOUR INGRESS CONTROLLER FOR ENVOY PROXYSEE MORE ONAKOMLJEN.COM
ROOK: CLOUD NATIVE ON-PREMISES PERSISTENT STORAGE FOR The block storage (think of EBS) is what will probably be more interesting to you. Each time you create a Kubernetes Persistent Volume Claim or PVC, the Ceph will create the new volume. The main component responsible for block storage is Ceph OSD along with Ceph MON which provides cluster membership, configuration, and state. KUBERNETES PERSISTENT VOLUMES WITH DEPLOYMENT AND STATEFULSETSEE MOREON AKOMLJEN.COM
INSTALLING KUBERNETES DASHBOARD PER NAMESPACESEE MORE ON AKOMLJEN.COM KUBERNETES API RESOURCES: WHICH GROUP AND VERSION TO USE?SEE MORE ONAKOMLJEN.COM
KUBERNETES ENVIRONMENT VARIABLES PROTECT KUBERNETES EXTERNAL ENDPOINTS WITH OAUTH2 PROXYSEE MORE ONAKOMLJEN.COM
MOVING THE REMOTE TERRAFORM STATE ITEMS Due to recent refactoring, I figured out that I need to move some Terraform state items from one S3 path to another. And then to merge configurations with other stuff at the destination directory. Terraform can move state items around, but this feature doesn't work with remote states. Here isKUBERNETES TIPS
Kubernetes Tips - Part 1. Working with Kubernetes can be hard at the beginning. It is a complex orchestrator and you will probably spend a lot of time dealing with or finding a solution for a particular problem. I do the same, and I decided to write a series of posts which will cover different Kubernetes features. AN EASY WAY TO TRACK NEW RELEASES ON GITHUB As a software developer, you need to keep track of many projects/tools hosted on GitHub. While GitHub has a watch feature, I found it too noisy. I open GitHub notifications once in a year, or maybe less. If you like GitHub notifications, great, you can watch a repo onlyALEN KOMLJEN
I started to work with Docker containers seven years ago. I made my first Docker playground with a bunch of different images. As I began to work on enterprise-level applications deployment, I found out that there were a lot of things I was doing wrong. One Alen Komljen. May 27, 2020. kubernetes, addons, velero. KUBERNETES SERVICE MESH However, it is easier to integrate service mesh into your environment thanks to Kubernetes. Two logical components create service mesh. We already have pods which are designed to have many containers. Sidecar is the perfect example which extends and enhances the primary container in a pod. With service mesh, the sidecar is service proxy ordata
QUICK WORKING FROM HOME TIPS You will see hundreds of new working from home tips blog posts in the coming months. Most tech companies shifted to working from home (WFH) because of a global pandemic. We are all different, and what works for me will not work for you. I wrote this post to tell KUBERNETES ENVIRONMENT VARIABLES Last update: January 17, 2019 When building your application stack to work on Kubernetes, the basic pod configuration is usually done by setting different environment variables.Sometimes you want to configure just a few of them for a particular pod or to define a set of environment variables that can be shared by multiple pods. TERRAFORM AND AWS SPOT INSTANCES Terraform supports AWS and can provision spot instances also. Spot instances are great to save some money in the cloud. They could be used for any service, but it is really hard to manage stateful services like databases. If you have a stateless service spot instances are a great choice. You need to automate spot instanceprovisioning
KUBERNETES BACKUP AND RESTORE WITH VELERO 2. Create a manual backup on the old cluster and wait for it to finish velero -n kube-system backup create migration. 3. Switch to a new cluster and do a full restore velero -n kube-system restore create --from-backup migration. Depending on what you run in the cluster, you might need to adjust a few more things, but all resources that youhave
KUBERNETES TIPS
Kubernetes Tips - Part 1. Working with Kubernetes can be hard at the beginning. It is a complex orchestrator and you will probably spend a lot of time dealing with or finding a solution for a particular problem. I do the same, and I decided to write a series of posts which will cover different Kubernetes features. PROTECT KUBERNETES EXTERNAL ENDPOINTS WITH OAUTH2 PROXY Last update: February 23, 2019 Sometimes you just want to expose some services that don't have any authentication mechanism. Many users have this issue, especially with Kubernetes, because it is damn easy to expose any service over ingress and also to have HTTPS by default with Let's Encrypt.The missing piece could be authentication in the application you want to expose. MOVING THE REMOTE TERRAFORM STATE ITEMS Due to recent refactoring, I figured out that I need to move some Terraform state items from one S3 path to another. And then to merge configurations with other stuff at the destination directory. Terraform can move state items around, but this feature doesn't work with remote states. Here is USING EXISTING CEPH CLUSTER FOR KUBERNETES PERSISTENT STORAGE Last update: January 15, 2019 I wrote about Rook storage a few weeks ago, but maybe you already have Ceph cluster running in your datacenter. Or you prefer to use Ceph on separate nodes and without Kubernetes.Also, currently Rook is alpha software and not ready forproduction use.
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ALEN KOMLJEN
Doing DevOps the Cloud Native Way. kubernetes , monitoring ALERTING ON KUBERNETES EVENTS WITH EFK STACK You probably care about gathering application logs only. Still, since the application is running on Kubernetes, you could get a lot of information about what is happening in the cluster by gathering events as well. Whatever happens inside the cluster, an event is recorded. You can check those events with kubectl events, but they are short-lived. To search or alert on a particular activity, you need to store them in a central place first. Now, let's see how to do ...Alen Komljen
November 03, 2019
kubernetes , show me INSTALLING KUBERNETES DASHBOARD PER NAMESPACE Even though I'm not Kubernetes Dashboard user, I understand why for most people this is the easiest way to interact with their apps running on top of Kubernetes. If you are interacting with it daily or managing the cluster itself, you are probably more fine with CLI aka kubectl. Kubernetes Dashboard is easy to install, but you might want to have it per namespace to limit what users can do. Let's see how to install and configure it for this ...Alen Komljen
May 26, 2019
kubernetes , aws , security INTEGRATING AWS IAM AND KUBERNETES WITH KUBE2IAM Containers deployed on top of Kubernetes sometimes requires easy access to AWS services. You have a few options to configure this. Most common is providing AWS access credentials to a particular pod or updating existing worker nodes IAM role with additional access rules. Pods in the AWS environment, by default, have the same access rules as underlying nodes. However, both solutions are a terrible practice, because there are projects that resolve this issue more elegantly. Two most popular are kube2iam ...Alen Komljen
May 18, 2019
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AN EASY WAY TO TRACK NEW RELEASES ON GITHUB As a software developer, you need to keep track of many projects/tools hosted on GitHub. While GitHub has a watch feature, I found it too noisy. I open GitHub notifications once in a year, or maybe less. If you like GitHub notifications, great, you can watch a repo only for releases; they made this possible two months ago. This blog post probably doesn't make any sense for you then.However, I don't want to get a notification on new ...Alen Komljen
January 12, 2019
kubernetes , ingress , aws AWS ALB INGRESS CONTROLLER FOR KUBERNETES More than one year ago CoreOS introduced AWS ALB (Application Load Balancer) support for Kubernetes. This project was born out of Ticketmaster's tight relationship with CoreOS. It was in an alpha state for a long time, so I waited for some beta/stable release to put my hands on it. The project is donated to Kubernetes SIG-AWS on June 1, 2018, and now there is a lot more activity. A few months ago the first stable version got released. Let's ...Alen Komljen
January 06, 2019
10 MOST READ KUBERNETES ARTICLES ON MY BLOG IN 2018 Let's start this year with some stats from the last one, 2018. Probably 99% of the articles on this blog are Kubernetes related. I wrote 28 articles in 2018 which is good, but my goal was 50 actually. I think that Kubernetes adoption in 2019 will grow, at least stats from my blog shows that and you will see the same in Google trends:Before listing 10 most read Kubernetes articles on my blog in 2018, I will share some ...Alen Komljen
January 01, 2019
kubernetes , show me KUBERNETES API RESOURCES: WHICH GROUP AND VERSION TO USE? Kubernetes uses declarative API which makes the system more robust. But, this means that we create an object using CLI or REST to represent what we want the system to do. For representation, we need to define things like API resource name, group, and version. But users get confused. The main reason for the confusion is that we as humans are not good at remembering things like this. In one deployment definition you could see this apiVersion: apps/v1beta2, and ...Alen Komljen
November 30, 2018
kubernetes , show me HOW TO RUN DEV.TO ON KUBERNETES Recently I was checking Dev.to community. I must say, I really like how the application looks, clean and simple. And more important I like the community there. I also started to republish some posts because I want to show Kubernetes to the larger audience, preferably developers. But, any time I check something new I get some new ideas. This time I saw that Dev.to is open source and thought, it would be pretty interesting for people to see ...Alen Komljen
November 25, 2018
kubernetes , ingress KUBERNETES CONTOUR INGRESS CONTROLLER FOR ENVOY PROXY Most users while starting to learn Kubernetes will get to the point of exposing some resources outside the cluster. This is like a Hello World example in the Kubernetes world. And in most cases, the solution to this problem is the ingress controller. Think of ingress as a reverse proxy. Ingress sits between the Kubernetes service and Internet. It provides name-based routing, SSL termination, and other goodies. Often when approaching this problem users will choose Nginx. And the reason is ...Alen Komljen
November 08, 2018
kubernetes , show me KUBERNETES ADD-ONS FOR MORE EFFICIENT COMPUTING I will say that "starting" a Kubernetes cluster is a relatively easy job. Deploying your application to work on top of Kubernetes requires more effort especially if you are new to containers. For people that worked with Docker this can also be a relatively easy job, but of course, you need to master new tools like Helm for example. Then, when you put all together and when you try to run your application in production you will find out there ...Alen Komljen
September 30, 2018
career
THE IMPORTANCE OF TECH BLOGGING I have a lot to share when it comes to blogging. This is actually my third tech blog and a pretty successful one. Yay, finally! :) It's a shame that really good engineers, with a lot to share often find excuses to not start blogging. Usually, you will hear things like "I have no time for writing" or they just don't see the point. They don't understand how the blog can help them professionally among other things. Now, more than ever ...Alen Komljen
July 29, 2018
kubernetes , security PROTECT KUBERNETES EXTERNAL ENDPOINTS WITH OAUTH2 PROXY Sometimes you just want to expose some services that don't have any authentication mechanism. Many users have this issue, especially with Kubernetes, because it is damn easy to expose any service over ingress and also to have HTTPS by default with Let's Encrypt. The missing piece could be authentication in the application you want to expose. In this case, we can always leverage external authentication from GitHub, Google, and many others via OAuth. This is where OAuth2 Proxycomes into ...
Alen Komljen
July 17, 2018
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