I would like to set the name field in a Namespace resource and also replace the namespace field in a Deployment resource with the same value, for example my-namespace.
Here is kustomization.json:
namespace: <NAMESPACE>
apiVersion: kustomize.config.k8s.io/v1beta1
kind: Kustomization
patchesJson6902:
- patch: |-
- op: replace
path: /metadata/name
value: <NAMESPACE>
target:
kind: Namespace
name: system
version: v1
resources:
- manager.yaml
and manager.yaml:
apiVersion: v1
kind: Namespace
metadata:
labels:
control-plane: controller-manager
name: system
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: controller-manager
namespace: system
spec:
selector:
matchLabels:
control-plane: controller-manager
replicas: 1
template:
metadata:
labels:
control-plane: controller-manager
spec:
containers:
- command:
- /manager
args:
- --enable-leader-election
image: controller:latest
name: manager
I tried using kustomize edit set namespace my-namespace && kustomize build, but it only changes the namespace field in the Deployment object.
Is there a way to change both field without using sed, in 'pure' kustomize and without having to change manually value in kustomization.json?
Is there a way to change both field without using sed, in 'pure' kustomize and without having to change manually value in kustomization.json?
I managed to achieve somewhat similar with the following configuration:
kustomization.yaml
apiVersion: kustomize.config.k8s.io/v1beta1
kind: Kustomization
namespace: my-namespace
resources:
- deployment.yaml
depyloment.yaml
---
apiVersion: v1
kind: Namespace
metadata:
name: nginx
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: nginx-deployment
namespace: nginx
spec:
replicas: 2
selector:
matchLabels:
app: nginx
template:
metadata:
labels:
app: nginx
spec:
containers:
- image: nginx:1.14.2
name: nginx
ports:
- containerPort: 80
And here is the output of the command that you used:
➜ kustomize kustomize edit set namespace my-namespace7 && kustomize build .
apiVersion: v1
kind: Namespace
metadata:
name: my-namespace7
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: nginx-deployment
namespace: my-namespace7
spec:
replicas: 2
selector:
matchLabels:
app: nginx
template:
metadata:
labels:
app: nginx
spec:
containers:
- image: nginx:1.14.2
name: nginx
ports:
- containerPort: 80
What is happening here is that once you set the namespace globally in kustomization.yaml it will apply it to your targets which looks to me that looks an easier way to achieve what you want.
I cannot test your config without manager_patch.yaml content. If you wish to go with your way further you will have update the question with the file content.
For Kubernetes Deployment we can specify imagePullSecrets to allow it to pull Docker images from our private registry. But as far as I can tell, StatefulSet doesn't support this?
How can I supply a pullsecret to my StatefulSet?
apiVersion: apps/v1
kind: StatefulSet
metadata:
name: redis
namespace: {{ .Values.namespace }}
labels:
app: redis
spec:
replicas: 1
selector:
matchLabels:
app: redis
serviceName: redis-service
updateStrategy:
type: RollingUpdate
template:
metadata:
labels:
app: redis
spec:
terminationGracePeriodSeconds: 10
# imagePullSecrets not valid here for StatefulSet :-(
containers:
- image: {{ .Values.image }}
StatefulSet supports imagePullSecrets. You can check it as follows.
$ kubectl explain statefulset.spec.template.spec --api-version apps/v1
:
imagePullSecrets <[]Object>
ImagePullSecrets is an optional list of references to secrets in the same
namespace to use for pulling any of the images used by this PodSpec. If
specified, these secrets will be passed to individual puller
implementations for them to use. For example, in the case of docker, only
DockerConfig type secrets are honored. More info:
https://kubernetes.io/docs/concepts/containers/images#specifying-imagepullsecrets-on-a-pod
:
For instance, you can try if the following sample StatefulSet can create in your cluster first.
$ kubectl create -f - <<EOF
apiVersion: apps/v1
kind: StatefulSet
metadata:
name: web
spec:
serviceName: "nginx"
replicas: 2
selector:
matchLabels:
app: nginx
template:
metadata:
labels:
app: nginx
spec:
imagePullSecrets:
- name: YOUR-PULL-SECRET-NAME
containers:
- name: nginx
image: k8s.gcr.io/nginx-slim:0.8
ports:
- containerPort: 80
name: web
EOF
$ kubectl get pod web-0 -o yaml | \
grep -E '^[[:space:]]+imagePullSecrets:' -A1
imagePullSecrets:
- name: YOUR-PULL-SECRET-NAME
I am setting up the kubernetes setup for django webapp.
I am passing environment variable while creating deployment as below
kubectl create -f deployment.yml -l key1=value1
I am getting error as below
error: no objects passed to create
Able to create the deployment successfully, If i remove the env variable -l key1=value1 while creating deployment.
deployment.yaml as below
#Deployment
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
labels:
service: sigma-service
name: $key1
What will be the reason for causing the above error while creating deployment?
I used envsubst (https://www.gnu.org/software/gettext/manual/html_node/envsubst-Invocation.html) for this. Create a deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: $NAME
labels:
app: nginx
spec:
replicas: 1
selector:
matchLabels:
app: nginx
template:
metadata:
labels:
app: nginx
spec:
containers:
- name: nginx
image: nginx:1.7.9
ports:
- containerPort: 80
Then:
export NAME=my-test-nginx
envsubst < deployment.yaml | kubectl apply -f -
Not sure what OS are you using to run this. On macOS, envsubst installed like:
brew install gettext
brew link --force gettext
This isn't a right way to use the deployment, you can't provide half details in yaml and half in kubectl commands. If you want to pass environment variables in your deployment you should add those detail in the deployment spec.template.spec:
You should add following block to your deployment.yaml
spec:
containers:
- env:
- name: var1
value: val1
This will export your environment variables inside the container.
The other way to export the environment variable is use kubectl run (not advisable) as it is going to be depreciated very soon. You can use following command:
kubectl run nginx --image=nginx --restart=Always --replicas=1 --env=var1=val1
The above command will create a deployment nginx with replica 1 and environment variable var1=val1
You cannot pass variables to "kubectl create -f". YAML files should be complete manifests without variables. Also you cannot use "-l" flag to "kubectl create -f".
If you want to pass environment variables to pod you should do like that:
apiVersion: apps/v1
kind: Deployment
metadata:
name: nginx-deployment
labels:
app: nginx
spec:
replicas: 1
selector:
matchLabels:
app: nginx
template:
metadata:
labels:
app: nginx
spec:
containers:
- name: nginx
image: nginx:1.7.9
env:
- name: MY_VAT
value: MY_VALUE
ports:
- containerPort: 80
Read more here: https://kubernetes.io/docs/tasks/inject-data-application/define-environment-variable-container/
Follow the below steps
create test-deploy.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: MYAPP
labels:
app: nginx
spec:
replicas: 1
selector:
matchLabels:
app: nginx
template:
metadata:
labels:
app: nginx
spec:
containers:
- name: nginx
image: nginx:1.7.9
ports:
- containerPort: 80
using sed command you can update the deployment name at deployment time
sed -e 's|MYAPP|my-nginx|g' test-deploy.yaml | kubectl apply -f -
File: ./deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: MYAPP
labels:
app: nginx
spec:
replicas: 1
selector:
matchLabels:
app: nginx
template:
metadata:
labels:
app: nginx
spec:
containers:
- name: nginx
image: nginx:1.7.9
ports:
- containerPort: 80
File: ./service.yaml
apiVersion: v1
kind: Service
metadata:
name: MYAPP
labels:
app: nginx
spec:
type: ClusterIP
ports:
- port: 80
selector:
app: nginx
File: ./kustomization.yaml
resources:
- deployment.yaml
- service.yaml
If you're using https://kustomize.io/, you can do this trick in a CI:
sh '( echo "images:" ; echo " - name: $IMAGE" ; echo " newTag: $VERSION" ) >> ./kustomization.yaml'
sh "kubectl apply --kustomize ."
I chose yq since it is yaml aware and gives a precise control where text substitutions happen.
To set an image from bash env var:
export IMAGE="your_image:latest"
yq eval '.spec.template.spec.containers[0].image = "'$IMAGE'"' manifests/daemonset.yaml | kubectl apply -f -
yq is available on MacPorts (as of 19/04/21 v4.4.1) with sudo port install yq
I was facing the same problem. I created a python script to change simple/complex or add values to the YAML file.
This became very handy in a similar situation that you describe. Also, switching to the python domain can allow for more complex scenarios.
The code and how to use it are available at this gist.
https://gist.github.com/washraf/f81153270c80b0b4ecf90a53872abde7
Please try following
apiVersion: apps/v1
kind: Deployment
metadata:
namespace: kdpd00201
name: frontend
labels:
app: nginx
spec:
replicas: 6
selector:
matchLabels:
app: nginx
template:
metadata:
labels:
app: nginx
spec:
containers:
- name: frontend
image: ifccncf/nginx:1.14.2
ports:
- containerPort: 8001
env:
- name: NGINX_PORT
value: "8001"
My solution is then
apiVersion: apps/v1
kind: Deployment
metadata:
creationTimestamp: null
labels:
app: frontend
name: frontend
namespace: kdpd00201
spec:
replicas: 4
selector:
matchLabels:
app: frontend
strategy: {}
template:
metadata:
creationTimestamp: null
labels:
app: frontend
spec:
containers:
- env: # modified level
- name: NGINX_PORT
value: "8080"
image: lfccncf/nginx:1.13.7
name: nginx
ports:
- containerPort: 8080
consider the following kubernetes manifest (mymanifest.yml) :
apiVersion: v1
kind: Pod
metadata:
name: firstpod
spec:
containers:
- image: nginx
name: nginx
---
apiVersion: v1
kind: Pod
metadata:
name: secondpod
spec:
containers:
- image: nginx
name: nginx
If I do kubectl apply -f mymanifest.yml both pods are deployed.
I remember someone told me that it is possible to deploy only one pod. Something like :
kubectl apply -f mymanifest.yml secondpod
But it doesn't work.
Is there a way to do it?
Thx in advance
You can add labels to the pods
apiVersion: v1
kind: Pod
metadata:
name: firstpod
labels:
app: firstpod
spec:
containers:
- image: nginx
name: nginx
---
apiVersion: v1
kind: Pod
metadata:
name: secondpod
labels:
app: secondpod
spec:
containers:
- image: nginx
name: nginx
Use specific label to filter while applying the yaml. The filter supports =, ==, and !=
kubectl apply -f mymanifest.yml -l app=secondpod
You can also use --prune which is an alpha feature.
# Apply the configuration in manifest.yaml that matches label app=secondpod and delete all the other resources that are
not in the file and match label app=secondpod.
kubectl apply --prune -f mymanifest.yml -l app=secondpod
Currently my pods are all named "some-deployment-foo-bar" which does not help me track down issues when an error is reported with just the hostname.
So I want "$POD_NAMESPACE.$POD_NAME" as hostname.
I tried pod.beta.kubernetes.io/hostname: "foo" but that only sets an absolute name ... and subdomain did not work ...
The only other solution I saw was using a wrapper script that modifies the hostname and then executes the actual command ... which is pretty hacky and adds overhead ot every container.
Any way of doing this nicely?
current config is:
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
name: foo
labels:
project: foo
spec:
selector:
matchLabels:
project: foo
template:
metadata:
name: foo
labels:
project: foo
spec:
containers:
- image: busybox
name: foo
PodSpec has a subdomain field, which can be used to specify the Pod’s subdomain. This field value takes precedence over the pod.beta.kubernetes.io/subdomain annotation value.
There is more information here, below is an example.
apiVersion: v1
kind: Service
metadata:
name: default-subdomain
spec:
selector:
name: busybox
clusterIP: None
ports:
- name: foo # Actually, no port is needed.
port: 1234
targetPort: 1234
---
apiVersion: v1
kind: Pod
metadata:
name: busybox1
labels:
name: busybox
spec:
hostname: busybox-1
subdomain: default-subdomain
containers:
- image: busybox
command:
- sleep
- "3600"
name: busybox
---
apiVersion: v1
kind: Pod
metadata:
name: busybox2
labels:
name: busybox
spec:
hostname: busybox-2
subdomain: default-subdomain
containers:
- image: busybox
command:
- sleep
- "3600"
name: busybox