Because some of my pods get stuck, I want to recreate a DaemonSet and a few security-related resources created by Weave Net plugin during kubeadm bootstrap.
I used the kubectl apply -f "https://cloud.weave.works/k8s/net?k8s-version=$(kubectl version | base64 | tr -d '\n')" command several times, but the pod status didn't change.
Here is the command to install Weave Net for Kubernetes cluster version 1.6+ (just to have a complete answer):
$ kubectl apply -f "https://cloud.weave.works/k8s/net?k8s-version=$(kubectl version | base64 | tr -d '\n')"
To delete all those resources, run the following command:
$ kubectl delete -f "https://cloud.weave.works/k8s/net?k8s-version=$(kubectl version | base64 | tr -d '\n')"
To have more information about the root cause of the problem, check the state of pods:
$ kubectl describe pod weave-net-xspgn
$ kubectl describe pod kube-dns-86f4d74b45-9t4mj
$ kubectl describe pod kube-proxy-2gjj4
The kubelet log can also be very helpful:
# journalctl -u kubelet
Related
istioctl kube-inject \
--injectConfigFile inject-config.yaml \
--meshConfigFile mesh-config.yaml \
--valuesFile inject-values.yaml \
--filename samples/sleep/sleep.yaml \
| kubectl apply -f -
While trying to inject istio sidecar container manually to pod. I got error -
Error: template: inject:469: function "appendMultusNetwork" not defined
https://istio.io/latest/docs/setup/additional-setup/sidecar-injection/
As mentioned in comments I have tried to reproduce your issue on gke with istio 1.7.4 installed.
I've followed the documentation you mentioned and it worked without any issues.
1.Install istioctl and istio default profile
curl -sL https://istio.io/downloadIstioctl | sh -
export PATH=$PATH:$HOME/.istioctl/bin
istioctl install
2.Create samples/sleep directory and create sleep.yaml, for example with vi.
3.Create local copies of the configuration.
kubectl -n istio-system get configmap istio-sidecar-injector -o=jsonpath='{.data.config}' > inject-config.yaml
kubectl -n istio-system get configmap istio-sidecar-injector -o=jsonpath='{.data.values}' > inject-values.yaml
kubectl -n istio-system get configmap istio -o=jsonpath='{.data.mesh}' > mesh-config.yaml
4.Apply it with istioctl kube-inject
istioctl kube-inject \
--injectConfigFile inject-config.yaml \
--meshConfigFile mesh-config.yaml \
--valuesFile inject-values.yaml \
--filename samples/sleep/sleep.yaml \
| kubectl apply -f -
5.Verify that the sidecar has been injected
kubectl get pods
NAME READY STATUS RESTARTS AGE
sleep-5768c96874-m65bg 2/2 Running 0 105s
So there are few things worth to check as it might might cause this issue::
Could you please check if you executed all your commands correctly?
Maybe you run older version of istio and you should follow older
documentation?
Maybe you changed something in above local copies of the
configuration and that cause the issue? If you did what exactly did you change?
I'm looking for a command like "gcloud config get-value project" that retrieves a project's name, but for a pod (it can retrieve any pod name that is running). I know you can get multiple pods with "kubectl get pods", but I would just like one pod name as the result.
I'm having to do this all the time:
kubectl get pods # add one of the pod names in next line
kubectl logs -f some-pod-frontend-3931629792-g589c some-app
I'm thinking along the lines of "gcloud config get-value pod". Is there a command to do that correctly?
There are many ways, here are some examples of solutions:
kubectl get pods -o name --no-headers=true
kubectl get pods -o=name --all-namespaces | grep kube-proxy
kubectl get pods -o go-template --template '{{range .items}}{{.metadata.name}}{{"\n"}}{{end}}'
For additional reading, please take a look to these links:
kubernetes list all running pods name
Kubernetes list all container id
https://kubernetes.io/docs/tasks/access-application-cluster/list-all-running-container-images/
You can use the grep command to filter any output on stdout. So to get pods matching a specified pattern you can use a command like this:
> kubectl get pods --all-namespaces|grep grafana
Output:
monitoring kube-prometheus-grafana-57d5b4d79f-smkz6 2/2 Running 0 1h
To only output the pod name, you can use the awk command with a parameter of '{print $2}', which displays the second column of the previous output:
kubectl get pods --all-namespaces|grep grafana|awk '{print $2}'
To only display one line you can use the head command like so:
kubectl get pods --all-namespaces|grep grafana|awk '{print $2}'|head -n 1
This will output the last pod name :
kubectl get pods -o go-template --template ' {{range .items}}{{.metadata.name}}{{"\n"}}{{end}}' | awk '{print $1}' | tail -n 1
if you want to fetch logs for a pod:
kubectl logs -f kubectl get pods -o go-template --template ' {{range .items}}{{.metadata.name}}{{"\n"}}{{end}}' | awk '{print $1}' | tail -n 1
just run the command with a single quotes.
Links:
kubernetes list all running pods name
https://kubernetes.io/docs/tasks/access-application-cluster/list-all-running-container-images/
Hope this helps!!
I'm trying to start a dashboard inside play-with-kubernetes
Commands I'm running:
start admin node
kubeadm init --apiserver-advertise-address $(hostname -i)
start network
kubectl apply -n kube-system -f "https://cloud.weave.works/k8s/net?k8s-version=$(kubectl version | base64 | tr -d '\n')"
allow master to hold nodes(?)
kubectl taint nodes --all node-role.kubernetes.io/master-
Wait until dns is up
kubectl get pods --all-namespaces
join node (copy from admin startup, not from here)
kubeadm join --token 43d52c.d72308004d523ac4 10.0.21.3:6443
download and run dashboard
curl -L -s https://raw.githubusercontent.com/kubernetes/dashboard/master/src/deploy/recommended/kubernetes-dashboard.yaml | sed 's/targetPort: 8443/targetPort: 8443\n type: NodePort/' | \
kubectl apply -f -
Unfortunatelly dashboard is not available.
What should I do to correctly deploy it inside play-with-kubernetes?
You need heapster for dashboard to work. So execute these as well:
kubectl apply -f https://github.com/kubernetes/heapster/raw/master/deploy/kube-config/rbac/heapster-rbac.yaml
kubectl apply -f https://github.com/kubernetes/heapster/raw/master/deploy/kube-config/influxdb/heapster.yaml
kubectl apply -f https://raw.githubusercontent.com/kubernetes/heapster/master/deploy/kube-config/influxdb/influxdb.yaml
Also, unless you want to fiddle with authentication you need to grant dashboard admin privileges with something like this:
kubectl create clusterrolebinding insecure-dashboard --clusterrole=cluster-admin --serviceaccount=kube-system:kubernetes-dashboard
Eventually a port link will appear (30xxx) but you will need to change the url scheme to https from http - and convince your browser that you don't care about the insecure certificate.
You should have a working dashboard now. Piece of cake ;)
I've found jsonpath examples for testing multiple values but not extracting multiple values.
I want to get image and name from kubectl get pods.
this gets me name
kubectl get pods -o=jsonpath='{.items[*].spec.containers[*].name}' | xargs -n 1
this gets me image
kubectl get pods -o=jsonpath='{.items[*].spec.containers[*].image}' | xargs -n 1
but
kubectl get pods -o=jsonpath='{.items[*].spec.containers[*].[name,image}' | xargs -n 2
complains invalid array index image - is there a syntax for getting a list of node-adjacent values?
Use below command to get name and image:
kubectl get pods -Ao jsonpath='{range .items[*]}{#.metadata.name}{" "}{#.spec.template.spec.containers[].image}{"\n"}{end}'
It will give output like below:
name image
Useful command, I had to modify it a little to make it work (failed with -a flag). Also, I added a filter to app label and one more field to get: namespace, pod name, image
kubectl get pods --all-namespaces -o jsonpath='{range .items[*]}{#.metadata.namespace}{"\t"}{#.metadata.name}{"\t"}{#.spec.containers[*].image}{"\n"}{end}' -l app=nginx
Thanks! I had to change a little bit, but this worked for me:
#!/bin/bash
releases=$(kubectl get deployment -A --output=jsonpath='{range .items[*]}{#.metadata.namespace}{"|"}{#.metadata.name}{"\n"}{end}')
for release in $releases; do
namespace=$( echo $release | cut -d "|" -f 1)
deployment=$( echo $release | cut -d "|" -f 2)
kubectl rollout restart deployments -n "${namespace}" "${deployment}"
done
I looking for the option to list all pods name
How to do without awk (or cut). Now i'm using this command
kubectl get --no-headers=true pods -o name | awk -F "/" '{print $2}'
Personally I prefer this method because it relies only on kubectl, is not very verbose and we don't get the pod/ prefix in the output:
kubectl get pods --no-headers -o custom-columns=":metadata.name"
You can use the go templating option built into kubectl to format the output to just show the names for each pod:
kubectl get pods --template '{{range .items}}{{.metadata.name}}{{"\n"}}{{end}}'
Get Names of pods using -o=name Refer this cheatsheet for more.
kubectl get pods -o=name
Example output:
pod/kube-xyz-53kg5
pod/kube-xyz-jh7d2
pod/kube-xyz-subt9
To remove trailing pod/ you can use standard bash sed command
kubectl get pods -o=name | sed "s/^.\{4\}//"
Example output:
kube-xyz-53kg5
kube-pqr-jh7d2
kube-abc-s2bt9
To get podname with particular string, standard linux grep command
kubectl get pods -o=name | grep kube-pqr | sed "s/^.\{4\}//"
Example output:
kube-pqr-jh7d2
With this name, you can do things, like adding alias to get shell to running container:
alias bashkubepqr='kubectl exec -it $(kubectl get pods -o=name | grep kube-pqr | sed "s/^.\{4\}//") bash'
You can use custom-columns in output option to get the name and --no-headers option
kubectl get --no-headers=true pods -l app=external-dns -o custom-columns=:metadata.name
You can use -o=name to display only pod names. For example to list proxy pods you can use:
kubectl get pods -o=name --all-namespaces | grep kube-proxy
The result is:
pod/kube-proxy-95rlj
pod/kube-proxy-bm77b
pod/kube-proxy-clc25
There is also this solution:
kubectl get pods -o jsonpath={..metadata.name}
Here is another way to do it:
kubectl get pods -o=name --field-selector=status.phase=Running
The --field-selector=status.phase=Running is needed as the question mention all the running pod names. If the all in the question is for all the namespaces, just add the --all-namespaces option.
Note that this command is very convenient when one want a quick way to access something from the running pod(s), such as logs :
kubectl logs -f $(kubectl get pods -o=name --field-selector=status.phase=Running)
Get all running pods in the namespace
kubectl get pods --field-selector=status.phase=Running --no-headers -o custom-columns=":metadata.name"
From viewing, finding resources.
You could also specify namespace with -n <namespace name>.
jsonpath alternative
kubectl get po -o jsonpath="{range .items[*]}{#.metadata.name}{end}" -l app=nginx-ingress,component=controller
see also:
more examples of kubectl output options
If you want to extract specific container's pod name then
A simple command can do all the hard work
kubectl get pods --template '{{range .items}}{{.metadata.name}}{{end}}' --selector=app=<CONTAINER-NAME>
Just replace <CONTAINER-NAME> with your service container-name
Well, In our case we have kept pods inside different namespace, here to identify the specific pod or list of pods we ran following command-
Approach 1:
To get the list of namespaces
kubectl get ns -A
To get all the pods inside one namespaces kubectl get pods -n <namespace>
Approach 2:
Use this command-
kubectl get pods --all-namespaces
kubectl exec -it $(kubectl get pods | grep mess | awk '{print $1}') /bin/bash
kubectl get po --all-namespaces | awk '{if ($4 != "Running") system ("kubectl -n " $1 " delete pods " $2 " --grace-period=0 " " --force ")}'