I'm sort of a newbie in k3s I know that in kubernetes, the multus plugin allows to to have multiple network interfaces attached to a pod, is there a way to have the same result with k3s?
There is this guide to install the plugin on k3s but I did not manage to make it work, has anyone succeded?
https://gist.github.com/janeczku/ab5139791f28bfba1e0e03cfc2963ecf
Related
I am looking for a way to install AppDynamics in a OpenShift Cluster.
Unable to find proper documentation on how to install and what tools need to be installed.
Should My Application Docker file also include any images related to AppDynamics
If anyone familiar with this please share some steps or provide reference to documents.
Old docs: https://docs.appdynamics.com/22.2/en/infrastructure-visibility/monitor-containers-with-docker-visibility/use-docker-visibility-with-red-hat-openshift
New Docs: https://docs.appdynamics.com/22.2/en/infrastructure-visibility/monitor-kubernetes-with-the-cluster-agent
Note that there is not a prescribed way to instrument as such, you need to make some decisions.
i.e. (from the second doc link):
The first decision is to use the officially released pre-built
Appdynamics Operator images published on DockerHub and Redhat
Registry or If you want to build a custom Appdynamics Operator image.
See Build the Custom Cluster Agent Image.
The second decision is whether to use the officially released
pre-built Cluster Agent images published on DockerHub and Redhat
Registry or If you want to build a custom Cluster Agent image. See
Cluster Agent Container Image.
The third decision is whether to install the Cluster Agent using the
Kubernetes CLI or the Cluster Agent Helm Chart. See Install the
Cluster Agent with the Kubernetes CLI and Install the Cluster Agent
with Helm Charts.
how to deploy a basic html website on gke, what do i need other than the dockerfile and the .html application itself? i have tried deploying applications which already have all the yaml files included but i don't know how to start from scratch. i don't have a lot of experience and i haven't found anything online about this. can anyone provide a step by step tutorial? what do i do after creating the cluster? taken the website is called hey.html, is this dockerfile enough?
FROM nginx:alpine
RUN apt-get update
RUN apt-get install -y ngin
COPY hey.html/usr/share/nginx/html
EXPOSE 80
To deploy any application in GKE you will need some Kubernetes and GCP knowledge. You can start with official documentation, Coursera path about GKE and Kubernetes in Cloud, official documentation or this article which will introduce you to the basic concepts.
I can start from recommending a good tutorial from Kubernetes official documentation on how to deploy example PHP Guestbook application with Redis it should give you a practical example on how to deploy from scratch.
It also uses a service of a type LoadBalancer which will use a controller to tell GCP to create a LoadBalancer that will expose your application to Internet so you do not have to deal with anything to expose the app.
About your Docker file, the workflow will look something like this:
Push your Dockerfile to a registry (some useful materials here), you will put that docker image into a deployment for easier future management and then create a service because pods are mortal and replaceable and service will take care of traffic send to right pods even when they will be recreated, you might also need some persistent volume but this will be specific to your application. And here you will find another good how-to by Google.
Try this and if you will have issues just ask another question with details of the problems that occurred.
See below to make changes in dockerfile
FROM nginx:alpine
RUN apt-get update
COPY hey.html /usr/share/nginx/html
EXPOSE 80
I have openshift 3.9 installed in one AWS region ohio. I have jenkins installed in it. I have a pipeline code in where it will take Java code from GitHub bind with jboss and deployed it in project test within the same cluster. It works fine and I'm able to access the app as pod is creating and app is also binding with jboss. Now I want to deploy this application across different clusters either within the same region or across different regions. Is there a way to achieve this?
You can use the oc command line tool in your Jenkins pipeline to deploy it to a different cluster. For a related example, check the Gitlab review apps example using an OpenShift cluster. It does something similar, where the CI pipeline deploys the required artifacts to an OpenShift cluster using oc and appropriate credentials.
What's the difference between OpenShift and Kubernetes and when should you use each? I understand that OpenShift is running Kubernetes under the hood but am looking to determine when running OpenShift would be better than Kubernetes and when OpenShift may be overkill.
In addition to the additional API entities, as mentioned by #SteveS, Openshift also has advanced security concepts.
This can be very helpful when running in an Enterprise context with specific requirements regarding security.
As much as this can be a strength for real-world applications in production, it can be a source of much frustration in the beginning.
One notable example is the fact that, by default, containers run as root in Kubernetes, but run under an arbitrary user with a high ID (e.g. 1000090000) in Openshift. This means that many containers from DockerHub do not work as expected. For some popular applications, The Red Hat Container Catalog supplies images with this feature/limitation in mind. However, this catalog contains only a subset of popular containers.
To get an idea of the system, I strongly suggest starting out with Kubernetes. Minikube is an excellent way to quickly setup a local, one-node Kubernetes cluster to play with. When you are familiar with the basic concepts, you will better understand the implications of the Openshift features and design decisions.
OpenShift includes a distribution of Kubernetes, so if you don't need any of those added features of OpenShift you can choice to ignore them such as: Web Console, Builds, advanced deployment models and much, much more.
Here's a summary of items available on the OpenShift website.
Kubernetes comes with Ingress Rules but Openshift comes with Routes
Kubernetes has IngressController but Openshift has Router as HAProxy
To swtich namespace in cli for openshift is very easy but in
kubernetes you need to create contex and switch between context
Openshift UI has more interactive and informative then Kubernetes
To bake docker image inside Openshift has BuildConfig but kubernetes
don't has any thing you need to build image and push to registry
Openshift has Pipeline where u don't need any jenkins to deploy any
app but Kubernetes don't has.
The easiest way to differentiate between them is to understand that while vanilla K8S is community project, OpenShift is more focused towards making it a enterprise ready product. Resources like Imagestreams, BC, Builds, DC, Routes etc along with leveraging functionalities like S2I, Router etc make it easier for Developers and admin alike to use OCP for development, deployment and lifecycle management. You can refer to the URL https://cloud.redhat.com/learn/topics/kubernetes/ for getting more information on key differences between them.
OCP makes your life much easier by giving easy actions using CLI command OC and fine grained webconsole.
You can try OCP and get first hand experience of the features using https://developers.redhat.com/developer-sandbox
where you can quick get access to sandboxed environment in a shared cluster.
I'd like to create a build chain for open source projects I'm working on. I'm currently using github, travis and coveralls. This is working fine but I'd like to add some kind of static code analyze.
I was thinking about hosting SonarQube on openshift, but problem is that openshift does not allow remote connection to database.
I have come to following solutions, but none of them seems to be easy to achieve:
Any REST API for sonar that could be used instead of raw db access
Any alternative for sonar that could be hosted on openshift
Migrate from travis to jenkins hosted on openshift and use this
Any other (free) alternative to openshift which would allow raw db access
Any other option
1 would be an ideal solution but I've searched all sonar plugins I could find and haven't found any :/
Am I missing something? There is no easy way to host sonar without exposing db access?
It looks like at least one person has gotten SonarQube running on OpenShift using the DIY cartridge:
http://majecek.wordpress.com/2013/12/06/how-to-run-sonarqube-4-0-on-openshift/
I was able to get SonarQube to start following those instructions.
EDIT: databases in OpenShift applications are only exposed publicly in scaled applications. You will want to create your sonar app with the -s option if you need to populate your database from outside OpenShift.