I cannot talk to a pod from side car container... any help will be appreciated!
Here's my deployment
---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
name: sidecar-deployment
spec:
replicas: 1
template:
metadata:
labels:
app: sidecar
spec:
containers:
- name: sidecar1
image: sidecar
args:
- /sidecar
- --port=32000
- --path=/sidecar1
ports:
- containerPort: 32000
- name: sidecar2
image: sidecar
args:
- /sidecar
- --port=32001
- --path=/sidecar2
ports:
- containerPort: 32001
And here's my service to the pod
---
apiVersion: v1
kind: Service
metadata:
name: sidecar-service
spec:
ports:
- name: http
port: 80
targetPort: 32001
protocol: TCP
selector:
app: sidecar
type: NodePort
After deploying ingress, I can connect to the service and sidecar2, because sidecar2 is exposed via service:
# this works
curl -L http://ADDR/sidecar2
But, I was expecting to be able to curl to the side container, but I can't.
This is what I did. I ssh into the sidecar container. And curl the colocated pod with localhost:
kubectl exec -it sidecar2 -- /bin/bash
# this doesn't work
curl -L http://localhost:32000/sidecar1
Can somebody help me on this?
Thanks!
If your sidecar image exposes the port (recheck your dockefile), you must connect with curl localhost:port/sidecar
If you have problem connecting from inside the container using the service it may be related to hairpin_mode.
Related
I'm trying to access my Golang Microservice that is running in the Kubernetes Cluster and has following Manifest..
apiVersion: apps/v1
kind: Deployment
metadata:
name: email-application-service
namespace: email-namespace
spec:
selector:
matchLabels:
run: internal-service
template:
metadata:
labels:
run: internal-service
spec:
containers:
- name: email-service-application
image: some_image
ports:
- containerPort: 8000
hostPort: 8000
protocol: TCP
envFrom:
- secretRef:
name: project-secrets
imagePullPolicy: IfNotPresent
So to access this Deployment from the Outside of the Cluster I'm using Service as well,
And I've set up some External IP for test purposes, which suppose to forward HTTP requests to the port 8000, where my application is actually running at.
apiVersion: v1
kind: Service
metadata:
name: email-internal-service
namespace: email-namespace
spec:
type: ClusterIP
externalIPs:
- 192.168.0.10
selector:
run: internal-service
ports:
- name: http
port: 8000
targetPort: 8000
protocol: TCP
So the problem is that When I'm trying to send a GET request from outside the Cluster by executing curl -f http:192.168.0.10:8000/ it just stuck until the timeout.
I've checked the state of the pods, logs of the application, matching of the selector/template names at the Service and Application Manifests, namespaces, but everything of this is fine and working properly...
(There is also a secret config but It Deployed and also working file)
Thanks...
Making reference to jordanm's solution: you want to put it back to clusterIP and then use port-forward with kubectl -n email-namespace port-forward svc/email-internal-service 8000:8000. You will then be able to access the service via http://localhost:8000. You may also be interested in github.com/txn2/kubefwd
I have two pods created with deployment and service. my problem is as follows the pod "my-gateway" accesses the url "adm-contact" of "http://127.0.0.1:3000/adm-contact" which accesses another pod called "my-adm-contact" as can i make this work? I tried the following command: kubectl port-forward my-gateway-5b85498f7d-5rwnn 3000:3000 8879:8879 but it gives this error:
E0526 21:56:34.024296 12428 portforward.go:400] an error occurred forwarding 3000 -> 3000: error forwarding port 3000 to pod 2d5811c20c3762c6c249a991babb71a107c5dd6b080c3c6d61b4a275b5747815, uid : exit status 1: 2022/05/27 00:56:35 socat[2494] E connect(16, AF=2 127.0.0.1:3000, 16): Connection refused
Remembering that the images created with dockerfile are with EXPOSE 3000 8879
follow my yamls:
Deployment my-adm-contact:
apiVersion: apps/v1
kind: Deployment
metadata:
name: my-adm-contact
labels:
app: my-adm-contact
spec:
selector:
matchLabels:
run: my-adm-contact
template:
metadata:
labels:
run: my-adm-contact
spec:
containers:
- name: my-adm-contact
image: my-contact-adm
imagePullPolicy: Never
ports:
- containerPort: 8879
hostPort: 8879
name: admcontact8879
readinessProbe:
httpGet:
path: /adm-contact
port: 8879
initialDelaySeconds: 30
periodSeconds: 10
failureThreshold: 6
Sevice my-adm-contact:
apiVersion: v1
kind: Service
metadata:
name: my-adm-contact
labels:
run: my-adm-contact
spec:
selector:
app: my-adm-contact
ports:
- name: 8879-my-adm-contact
port: 8879
protocol: TCP
targetPort: 8879
type: LoadBalancer
status:
loadBalancer: {}
Deployment my-gateway:
apiVersion: apps/v1
kind: Deployment
metadata:
name: my-gateway
labels:
app: my-gateway
spec:
selector:
matchLabels:
run: my-gateway
template:
metadata:
labels:
run: my-gateway
spec:
containers:
- name: my-gateway
image: api-gateway
imagePullPolicy: Never
ports:
- containerPort: 3000
hostPort: 3000
name: home
#- containerPort: 8879
# hostPort: 8879
# name: adm
readinessProbe:
httpGet:
path: /adm-contact
port: 8879
path: /
port: 3000
initialDelaySeconds: 30
periodSeconds: 10
failureThreshold: 6
Service my-gateway:
apiVersion: v1
kind: Service
metadata:
name: my-gateway
labels:
run: my-gateway
spec:
selector:
app: my-gateway
ports:
- name: 3000-my-gateway
port: 3000
protocol: TCP
targetPort: 3000
- name: 8879-my-gateway
port: 8879
protocol: TCP
targetPort: 8879
type: LoadBalancer
status:
loadBalancer: {}
What k8s-cluster environment are you running this in? I ask because the service.type of LoadBalancer is a special kind: at pod initialisation your cloud provider's admission controller will spot this and add in a loadbalancer config See https://kubernetes.io/docs/concepts/services-networking/service/#loadbalancer
If you're not deploying this in a suitable cloud environment, your services won't do anything.
I had a quick look at your SO profile and - sorry if this is presumptious, I don't mean to be - it looks like you're relatively new to k8s. You shouldn't need to do any port-forwarding/kubectl proxying, and this should be a lot simpler than you might think.
When you create a service k8s will 'create' a DNS entry for you which points to the pod(s) specified by your selector.
I think you're trying to reach a setup where code running in my-gateway pod can connect to http://adm-contact on port 3000 and reach a listening service on the adm-contact pod. Is that correct?
If so, the outline solution is to expose tcp/3000 in the adm-contact pod, and create a service called adm-contact that has a selector for adm-contact pod.
This is a sample manifest I've just created which runs nginx and then creates a service for it, allowing any pod on the cluster to connect to it e.g. curl http://nginx-service.default.svc In this example I'm exposing port 80 because I didn't want to have to modify the nginx config, but the principle is the same.
apiVersion: v1
kind: Pod
metadata:
labels:
app: nginx
name: nginx
spec:
containers:
- image: nginx
imagePullPolicy: Always
name: nginx
ports:
- containerPort: 80
protocol: TCP
---
apiVersion: v1
kind: Service
metadata:
name: nginx-service
spec:
ports:
- port: 80
protocol: TCP
targetPort: 80
selector:
app: nginx
type: ClusterIP
The k8s docs on Services are pretty helpful if you want more https://kubernetes.io/docs/concepts/services-networking/connect-applications-service/
a service can be reached on it's own name from pods in it's namespace:
so a service foo in namespace bar can be reached at http://foo from a pod in namespace bar
from other namespaces that service is reachable at http://foo.bar.svc.cluster.local. Change out the servicename and namespace for your usecase.
k8s dns is explained here in the docs:
https://kubernetes.io/docs/concepts/services-networking/dns-pod-service/
I have taken the YAML you provided and assembled it here.
From another comment I see the URL you're trying to connect to is: http://gateway-service.default.svc.cluster.local:3000/my-adm-contact-service
The ability to resolve service names to pods only functions inside the cluster: coredns (a k8s pod) is the part which recognises when a service has been created and what IP(s) it's available at.
So another pod in the cluster e.g. one created by kubectl run bb --image=busybox -it -- sh would be able to resolve the command ping gateway-service, but pinging gateway-service from your desktop will fail because they're not both seeing the same DNS.
The api-gateway container will be able to make a connect to my-adm-contact-service on ports 3000 or 8879, and the my-adm-contact container will equally be able to connect to gateway-service on port 3000 - but only when those containers are running inside the cluster.
I think you're trying to access this from outside the cluster, so now the port/service types are correct you could re-try a kubectl port-forward svc/gateway-service 3000:3000 This will let you connect to 127.0.0.1:3000 and the traffic will be routed to port 3000 on the api-gateway container.
If you need to proxy to the other my-adm-contact-service then you'll have to issue similar kubectl commands in other shells, one per service:port combination. For completeness, if you wanted to route traffic from your local machine to all three container/port sets, you'd run:
# format kubectl port-forward svc/name src:dest (both TCP)
kubectl port-forward svc/gateway-service 3000:3000
kubectl port-forward svc/my-adm-contact-service 8879:8879
kubectl port-forward svc/my-adm-contact-service 3001:3000 #NOTE the changed local port, because localhost:3000 is already used
You will need a new shell for each kubectl, or run it as a background job.
apiVersion: v1
kind: Pod
metadata:
name: my-adm-contact
labels:
app: my-adm-contact
spec:
containers:
- image: my-contact-adm
imagePullPolicy: Never
name: my-adm-contact
ports:
- containerPort: 8879
protocol: TCP
- containerPort: 3000
protocol: TCP
---
apiVersion: v1
kind: Service
metadata:
name: my-adm-contact-service
spec:
ports:
- port: 8879
protocol: TCP
targetPort: 8879
name: adm8879
- port: 3000
protocol: TCP
targetPort: 3000
name: adm3000
selector:
app: my-adm-contact
type: ClusterIP
---
apiVersion: v1
kind: Pod
metadata:
name: my-gateway
labels:
app: my-gateway
spec:
containers:
- image: api-gateway
imagePullPolicy: Never
name: my-gateway
ports:
- containerPort: 3000
protocol: TCP
---
apiVersion: v1
kind: Service
metadata:
name: gateway-service
spec:
ports:
- port: 3000
protocol: TCP
targetPort: 3000
selector:
app: my-gateway
type: ClusterIP
I am working my way through a kubernetes tutorial using GKE, but it was written with Azure in mind - tho it has been working ok so far.
The first part where it has not worked has been with exercises regarding coreDNS - which I understand does not exist on GKE - it's kubedns only?
Is this why I can't get a pod endpoint with:
export PODIP=$(kubectl get endpoints hello-world-clusterip -o jsonpath='{ .subsets[].addresses[].ip}')
and then curl:
curl http://$PODIP:8080
My deployment is definitely on the right port:
ports:
- containerPort: 8080
And, in fact, the deployment for the tut is from a google sample.
Is this to do with coreDNS or authorisation/needing a service account? What can I do to make the curl request work?
Deployment yaml is:
apiVersion: apps/v1
kind: Deployment
metadata:
name: hello-world-customdns
spec:
replicas: 3
selector:
matchLabels:
app: hello-world-customdns
template:
metadata:
labels:
app: hello-world-customdns
spec:
containers:
- name: hello-world
image: gcr.io/google-samples/hello-app:1.0
ports:
- containerPort: 8080
dnsPolicy: "None"
dnsConfig:
nameservers:
- 9.9.9.9
---
apiVersion: v1
kind: Service
metadata:
name: hello-world-customdns
spec:
selector:
app: hello-world-customdns
ports:
- port: 80
protocol: TCP
targetPort: 8080
Having a deeper insight on what Gari comments, when exposing a service outside your cluster, this services must be configured as NodePort or LoadBalancer, since ClusterIP only exposes the Service on a cluster-internal IP making the service only reachable from within the cluster, and since Cloud Shell is a a shell environment for managing resources hosted on Google Cloud, and not part of the cluster, that's why you're not getting any response. To change this, you can change your yaml file with the following:
apiVersion: apps/v1
kind: Deployment
metadata:
name: hello-world-customdns
spec:
replicas: 3
selector:
matchLabels:
app: hello-world-customdns
template:
metadata:
labels:
app: hello-world-customdns
spec:
containers:
- name: hello-world
image: gcr.io/google-samples/hello-app:1.0
ports:
- containerPort: 8080
dnsPolicy: "None"
dnsConfig:
nameservers:
- 9.9.9.9
---
apiVersion: v1
kind: Service
metadata:
name: hello-world-customdns
spec:
selector:
app: hello-world-customdns
type: NodePort
ports:
- port: 80
protocol: TCP
targetPort: 8080
After redeploying your service, you can run command kubectl get all -o wide on cloud shell to validate that NodePort type service has been created with a node and target port.
To test your deployment just throw a CURL test to he external IP from one of your nodes incluiding the node port that was assigned, the command should look like something like:
curl <node_IP_address>:<Node_port>
I created a redis deployment and service in kubernetes,
I can access redis from another pod by service ip, but I can't access it by service name
the redis yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: redis-deployment
namespace: myapp-ns
spec:
replicas: 1
selector:
matchLabels:
component: redis
template:
metadata:
labels:
component: redis
spec:
containers:
- name: redis
image: redis
ports:
- containerPort: 6379
---
apiVersion: v1
kind: Service
metadata:
name: redis
namespace: myapp-ns
spec:
type: ClusterIP
selector:
component: redis
ports:
- port: 6379
targetPort: 6379
I applied your file, and I am able to ping and telnet to the service both from within the same namespace and from a different namespace. To test this, I created pods in the same namespace and in a different namespace and installed telnet and ping. Then I exec'ed into them and did the below tests:
Same Namespace
kubectl exec -it <same-namespace-pod> /bin/bash
# ping redis
PING redis.<redis-namespace>.svc.cluster.local (172.20.211.84) 56(84) bytes of data.
# telnet redis 6379
Trying 172.20.211.84...
Connected to redis.<redis-namespace>.svc.cluster.local.
Escape character is '^]'.
Different Namespace
kubectl exec -it <different-namespace-pod> /bin/bash
# ping redis.<redis-namespace>.svc.cluster.local
PING redis.test.svc.cluster.local (172.20.211.84) 56(84) bytes of data.
# telnet redis.<redis-namespace>.svc.cluster.local 6379
Trying 172.20.211.84...
Connected to redis.<redis-namespace>.svc.cluster.local.
Escape character is '^]'.
If you are not able to do that due to dns resolution issues, you could look at your /etc/resolv.conf in your pod to make sure it has the search prefixes svc.cluster.local and cluster.local
I created a redis deployment and service in kubernetes, I can access
redis from another pod by service ip, but I can't access it by service
name
Keep in mind that you can use the Service name to access the backend Pods it exposes only within the same namespace. Looking at your Deployment and Service yaml manifests, we can see they're deployed within myapp-ns namespace. It means that only from a Pod which is deployed within this namespace you can access your Service by using it's name.
apiVersion: apps/v1
kind: Deployment
metadata:
name: redis-deployment
namespace: myapp-ns ### 👈
spec:
replicas: 1
selector:
matchLabels:
component: redis
template:
metadata:
labels:
component: redis
spec:
containers:
- name: redis
image: redis
ports:
- containerPort: 6379
---
apiVersion: v1
kind: Service
metadata:
name: redis
namespace: myapp-ns ### 👈
spec:
type: ClusterIP
selector:
component: redis
ports:
- port: 6379
targetPort: 6379
So if you deploy the following Pod:
apiVersion: v1
kind: Pod
metadata:
name: redis-client
namespace: myapp-ns ### 👈
spec:
containers:
- name: redis-client
image: debian
you will be able to access your Service by its name, so the following commands (provided you've installed all required tools) will work:
redis-cli -h redis
telnet redis 6379
However if your redis-cliet Pod is deployed to completely different namespace, you will need to use fully qualified domain name (FQDN) which is build according to the rule described here:
redis-cli -h redis.myapp-ns.svc.cluster.local
telnet redis.myapp-ns.svc.cluster.local 6379
I'm new to Kubernetes. I'm trying to convert the following DOCKER container code to YAML for kubernetes.
docker container run -d -p 80:80 --name MyFirstContainerWeb docker/getting-started:pwd
This is what I have come up with so far. Can someone please help me with the ingress part? I'm using Docker Desktop (which has kubernetes cluster). My final goal is to see the website in the browser.
apiVersion: apps/v1
kind: Deployment
metadata:
name: getting-started-deployment
spec:
selector:
matchLabels:
app: getting-started
replicas: 2
template:
metadata:
labels:
app: getting-started
spec:
containers:
- name: getting-started-container
image: docker/getting-started:pwd
ports:
- containerPort: 80
---
apiVersion: v1
kind: Service
metadata:
name: getting-started-service
namespace: default
labels:
app: myfirstcontainer
spec:
ports:
- protocol: TCP
port: 80
targetPort: 80
selector:
app: getting-started-service
You can use port-forward to forward to service port by running
$ kubectl port-forward svc/getting-started-service 80
To learn more about port-forwarding click here