get-port | Get an available TCP port | TCP library
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kandi X-RAY | get-port Summary
Get an available TCP port
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QUESTION
I am trying to find the simpliest method to use kubernetes in production. YAML templates look like an overhead to me. E.g. all I want is expose simple backend service. I can do it with kubectl with 2 lean commands:
...ANSWER
Answered 2021-May-02 at 12:03I am quoting the original question here:
kubectl create deployment hello-server --image=gcr.io/google-samples/hello-app:1.0 kubectl expose deployment hello-server --type LoadBalancer --port 80 --target-port 8080
But is it fine to use this in production? I would like to use Infrastructure-as-a-Code approach.
Your first approach is a list of commands, that must be executed in a certain order. In addition, all these commands are not idempotent, so you cannot run the commands multiple times.
Also from the original question:
Is there a way to avoid working with kubernetes template files directly and still follow best practices? E.g. generating Yaml files from docker-compose files or similar?
What is the expected kubectl usage in production? Just
kubectl apply -f
The second approach is declarative, you only describe what you want, and the command is idempotent, so it can be run many times without problems. Your desired state is written in text files, so any change can be managed with a version control system, e.g. Git and the process can be done with validation in a CI/CD pipeline.
For production environments, it is best practice to use version control system like git for what your cluster contain. This make it easy to recover or recreate your system.
QUESTION
I used below command to bring up the pod:
...ANSWER
Answered 2021-Apr-16 at 08:32You need to create a Gateway
to allow routing between the istio-ingressgateway
and your VirtualService
.
Something in the lines of :
QUESTION
Sorry if it's a naive question. Please correct me if my understanding is wrong.
Created POD using this command:
...ANSWER
Answered 2021-Mar-08 at 09:19By default, nginx
server listen to the port 80. You can see it in their docker image ref.
With kubectl run nginx --image=nginx --port=8888
what you have done here is you have expose another port along with 80. But the server is still listening on the 80
port.
So, try with target port 80
. For this reason when you tried with other than port 80
it's not working. Try with set --target-port=8888
to --target-port=80
.
Or, If you want to change the server port you need to use configmap along with pod to pass custom config to the server.
QUESTION
I need to make my app scan for a number of ports given as command line arguments and so far I have this:
...ANSWER
Answered 2021-Jan-28 at 22:08This is already handled - the syntax you propose doesn't quite fit QCommandLineParser
. Either use -p 5000,7000,8000
or -p "5000 7000 8000"
. All those ports will be the value of the port option, and you can then separate them with split(QRegularExpression("[, ]"), Qt::SkipEmptyParts)
(that's QString::split
). E.g.:
QUESTION
I have an nginx pod in the default namespace and a ClusterIP service exposing the pod.
...ANSWER
Answered 2020-Dec-30 at 21:56Please see this. https://kubernetes.io/docs/concepts/services-networking/service/#publishing-services-service-types You either need NodePort or LoadBalancer service type.
QUESTION
I'm running this script which scans ports, outputs the result to a psobject. It first checks if the port is TCP or UDP, then it runs a switch depending on whether the port is 3389, 443 or something else. If it's 3389 or 443, it uses the get-portcertificate function to get the certificate's subject and add this to the members of the object.
The problem is, when the script runs, I can see from "$obj | ft" line that it has added the RDP Cert and SSL Cert members to the object, but at the "$objServersList | ft" line these two are missing. Is it something to do with the fact that some instances of $obj have the "SSL Cert" member but some only have "RDP Cert"? How do I make it 'merge' those two types of object (or just put a null value if not appropriate)
I'm using Caleb Keene's get-portcertificate function, my code is below the function.
...ANSWER
Answered 2020-Oct-23 at 13:04Format-Table
decides the table header format based on the first few items piped to it, so if only some of the objects have an RDP Cert
property and the first such object is not at the start of the list, it won't be shown.
The solution is to either always add the property to all objects regardless of whether it has a value or not, or by requesting Format-Table
show the property explicitly:
QUESTION
I was using minikube, and when I created a load balancer it would always give me a diferent ip in the external endpoint, and I was able to access my app.
But now, I changed to docker kubernetes, and when I create a load balancer, it always add the localhost:8181
at the external endpoints.
here is my yaml:
...ANSWER
Answered 2020-Sep-22 at 09:07Official documentation says that:
Type values and their behaviors are: LoadBalancer: Exposes the Service externally using a cloud provider's load balancer. NodePort and ClusterIP Services, to which the external load balancer routes, are automatically created.
that is why with Kubernetes you have to have a cloud provider enabled (otherwise no External IP would be provisioned):
QUESTION
I follow below steps to deploy my custom jar
1)- I created on docker image through the below docker file
...ANSWER
Answered 2020-Aug-06 at 08:18Try to access on nodeport localhost:31284
and please use service type as NodePort
instead of LoadBalancer
because loadbalancer service type mostly used on cloud level.
and Use Target-Port as same port you configured on pod definition yaml file.
so your url should be http://10.96.142.93:8000
or another way you can be by using port-forward
kubectl port-forward pod_name 80:8000
this will map pod port to localhost port
Then access it on http://localhost:80
QUESTION
I'm following this guide to preserve source ip for service type nodeport.
kubectl create deployment source-ip-app --image=k8s.gcr.io/echoserver:1.4
kubectl expose deployment source-ip-app --name=clusterip --port=80 --target-port=8080
At this point my service is accessible externally with nodeip:nodeport
When I change the service traffic policy,
kubectl patch svc nodeport -p '{"spec":{"externalTrafficPolicy":"Local"}}'
my service is not accessible.
I found a similar issue , But the solution is not much helpful or not understandable for me . I saw some github threads which says its something to do with hostname override in kube proxy , I'm not clear with it too.
I'm using kubernetes version v1.15.3. Kube proxy is running in iptables mode. I have a single master node and few worker nodes. I'm facing the same issue in my minikube too.
Any help would be greatly appreciated.
...ANSWER
Answered 2020-Jul-30 at 16:07From the docs here
If there are no local endpoints, packets sent to the node are dropped
So you need to use the correct node IP of the kubernetes node to access the service. Here correct node IP is the node's IP where the pod is scheduled.
This is not necessary if you can make sure every node(master and workers) has a replica of the pod.
QUESTION
I am working on this tutorial and trying to deploy a deep learning model on the Google Cloud Engine. I am able to containerize successfully the model which is wrapped with the flask framework. However, when I want to connect the container with Kubernetes, I am getting an error.
...ANSWER
Answered 2020-Jul-03 at 08:55From version 1.18 kubectl run
creates only pod not deployment because the generators(deployment etc) used are removed entirely.Use below command to create a deployment
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