I would like to update or change memory limit to 90Gi in this spec using command line.
spec:
hard:
limits.cpu: 12500m
limits.memory: 80Gi
pods: "10"
requests.cpu: 12500m
requests.memory: 80Gi
The current steps are oc edit quota compute-resources, manually change the limit and save.
Try the following commands for your purpose.
For specific quota modification.
$ oc delete quota <name> && oc create quota <name> \
--hard=cpu=12500m,memory=80Gi
For specific deploymentconfig which you can list using oc get dc.
$ oc set resources dc/<target deploymentconfig name> \
--limits=cpu=12500m,memory=80Gi \
--requests=cpu=12500m,memory=80Gi
Related
In bash I am trying to use a variable in a jsonpath for an openshift patch cli command:
OS_OBJECT='sample.k8s.io/element'
VALUE='5'
oc patch quota "my-object" -p '{"spec":{"hard":{"$OS_OBJECT":"$VALUE"}}}'
But that gives the error:
Error from server: quantities must match the regular expression '^([+-]?[0-9.]+)([eEinumkKMGTP]*[-+]?[0-9]*)$'
indicating that the variable is not substituted/expanded.
If I write it explicitly it works:
oc patch quota "my-object" -p '{"spec":{"hard":{"sample.k8s.io/element":"5"}}}'
Any suggestions on how to include a variable in the jsonstring?
EDIT: Based on below answer I have also tried:
oc patch quota "my-object" -p "{'spec':{'hard':{'$OS_OBJECT':'$VALUE'}}}"
but that gives the error:
Error from server (BadRequest): invalid character '\'' looking for beginning of object key string
In single quotes everything is preserved by bash, you have to use double quotes for string interpolation to work (and use the escape sequence \" for the other double quotes).
Try this out:
oc patch quota "my-object" -p "{\"spec\":{\"hard\":{\"$OS_OBJECT\":\"$VALUE\"}}}"
Instead of OC patch would prefer OC apply on your templates. Templates are the best way to configure Openshift/Kubernetes objects which can be stored in git for version control to follow Infrastructure as code.
I am not the admin for my Openshift cluster, so can't access the resource quotas hence suggesting a way in Kubernetes but same can be applied in Openshift too, except the CLI change from kubectl to oc
Let's take a simple resource quota template:
$ cat resourcequota.yaml
apiVersion: v1
kind: ResourceQuota
metadata:
name: demo-quota
spec:
hard:
cpu: "1"
memory: 2Gi
pods: "10"
scopeSelector:
matchExpressions:
- operator : In
scopeName: PriorityClass
values: ["high"]
Now configure your quota using kubectl apply on your template. This creates resource which is configured in the template, in our case its resourcequota
$ kubectl apply -f resourcequota.yaml
resourcequota/demo-quota created
$ kubectl get quota
NAME CREATED AT
demo-quota 2019-11-19T12:23:37Z
$ kubectl describe quota demo-quota
Name: demo-quota
Namespace: default
Resource Used Hard
-------- ---- ----
cpu 0 1
memory 0 2Gi
pods 0 10
As your looking for an update in resource quota using patch, I would suggest here to edit the template and execute kubectl apply again to update the object.
$ kubectl apply -f resourcequota.yaml
Warning: kubectl apply should be used on resource created by either kubectl create --save-config or kubectl apply
resourcequota/demo-quota configured
$ kubectl describe quota demo-quota
Name: demo-quota
Namespace: default
Resource Used Hard
-------- ---- ----
cpu 0 2
memory 0 4Gi
pods 0 20
Similarly, you can execute oc apply for your operations as oc patch is not so user-friendly to configure.
With oc new-app command (source strategy) several objects are created but not an horizontal pod autoscaler object.
Can it be automated that after the new-app command an horizontal pod autoscaler is created? Or should I do it manually?
Thank you.
You should use Template[0] or custom script[1] to automate the process, because autoscaler is required deployment controller which is configured resources section to calculate the resource usage from autoscaler.
[0]Templates
[1] For example,
#!/bin/bash
oc new-app httpd &&
oc set resources dc/httpd --requests=cpu=100m &&
oc autoscale dc/httpd --min 1 --max 10 --cpu-percent=80
exit $?
I need to automate monitoring log of pods of an app
Monitoring a pod's log can be done using oc CLI
oc log -f my-app-5-43j
However, the pod's name changes dynamically over the deployments. If I want to automate the monitoring, like running a cron job, continually tailing the log even after another deployment, how should I do?
Will Gordon already commented solution, so I provide more practical usage for your understanding.
If you deploy your pod using deploymentConfig, daemonSet and so on, you can see logs of the pod without specifying a pod name as follows.
# oc logs -f dc/<your deploymentConfig name>
# oc logs -f ds/<your daemonset name>
Or you can get first pod name dynamically using jsonpath output option to see log.
# oc logs -f $(oc get pod -o jsonpath='{.items[0].metadata.name}')
If you can specify the pod with a specific label, you can use -l option either.
# oc logs -f $(oc get pod -l app=database -o jsonpath='{.items[0].metadata.name}')
I am experimenting with openshift/minishift, I find myself having to run:
oc edit scc privileged
and add:
- system:serviceaccount:default:router
So I can expose the pods. Is there a way to do it in a script?
I know oc adm have some command for policy manipulation but I can't figure out how to add this line.
You can achieve it using oc patch command and with type json. The snippet below will add a new item to array before 0th element. You can try it out with a fake "bla" value etc.
oc patch scc privileged --type=json -p '[{"op": "add", "path": "/users/0", "value":"system:serviceaccount:default:router"}]'
The --type=json will interpret the provided patch as jsonpatch operation. Unfortunately oc patch --help doesn't provide any example for json patch type. Luckily example usage can be found in kubernetes docs: kubectl patch
I have found an example piping to sed Here and adapted it to ruby so I can easily edit the data structure.
oc get scc privileged -o json |\
ruby -rjson -e 'i = JSON.load(STDIN.read); i["users"].push "system:serviceaccount:default:router"; puts i.to_json ' |\
oc replace scc -f -
Here is quick and dirty script to get started with minishift
The easiest way to add and remove users to SCCs from the command line is using the oc adm policy commands:
oc adm policy add-scc-to-user <scc_name> <user_name>
For more info, see this section.
So for your specific use-case, it would be:
oc adm policy add-scc-to-user privileged system:serviceaccount:default:router
I'm surprised its needed though. I use "oc cluster up" normally, but testing with recent minishift, its already added out of the box:
$ minishift start
$ eval $(minishift oc-env)
$ oc login -u system:admin
$ oc get scc privileged -o yaml | grep system:serviceaccount:default:router
- system:serviceaccount:default:router
$ minishift version
minishift v1.14.0+1ec5877
$ oc version
openshift v3.7.1+a8deba5-34
I'm trying to create a secret on OpenShift v3.3.0 using:
oc create secret generic my-secret --from-file=application-cloud.properties=src/main/resources/application-cloud.properties -n my-project
Because I created the same secret earlier, I get this error message:
Error from server: secrets "my-secret" already exists
I looked at oc, oc create and oc create secret options and could not find an option to overwrite the secret when creating it.
I then tried to delete the existing secret with oc delete. All the commands listed below return either No resources found or a syntax error.
oc delete secrets -l my-secret -n my-project
oc delete secret -l my-secret -n my-project
oc delete secrets -l my-secret
oc delete secret -l my-secret
oc delete pods,secrets -l my-project
oc delete pods,secrets -l my-secret
oc delete secret generic -l my-secret
Do you know how to delete a secret or overwrite a secret upon creation using the OpenShift console or the command line?
"my-secret" is the name of the secret, so you should delete it like this:
oc delete secret my-secret
Add -n option if you are not using the project where the secret was created
oc delete secret my-secret -n <namespace>
I hope by this time you might have the answer ready, just sharing if this can help others.
As on today here are the details of CLI version and Openshift version which I am working on:
$ oc version
oc v3.6.173.0.5
kubernetes v1.6.1+5115d708d7
features: Basic-Auth
Server <SERVER-URL>
openshift v3.11.0+ec8630f-265
kubernetes v1.11.0+d4cacc0
Let's take a simple secret with a key-value pair generated using a file, will get to know the advantage if generated via a file.
$ echo -n "password" | base64
cGFzc3dvcmQ=
Will create a secret with this value:
$ cat clientSecret.yaml
apiVersion: v1
kind: Secret
metadata:
name: test-secret
data:
clienttoken: cGFzc3dvcmQ=
$ oc apply -f clientSecret.yaml
secret "test-secret" created
Let's change the password and update it in the YAML file.
$ echo -n "change-password" | base64
Y2hhbmdlLXBhc3N3b3Jk
$ cat clientSecret.yaml
apiVersion: v1
kind: Secret
metadata:
name: test-secret
data:
clienttoken: Y2hhbmdlLXBhc3N3b3Jk
From the definition of oc create command, it creates a resource if found throws an error. So this command won't fit to update a configuration of a resource, in our case its a secret.
$ oc create --help
Create a resource by filename or stdin
To make life easier, Openshift has provided oc apply command to apply a configuration to a resource if there is a change. This command is also used to create a resource, which helps a lot during automated deployments.
$ oc apply --help
Apply a configuration to a resource by filename or stdin.
$ oc apply -f clientSecret.yaml
secret "test-secret" configured
By the time you check the secret in UI, a new/updated password appears on the console.
So if you have noticed, first time apply has resulted in created - secret "test-secret" created and in subsequent apply results in configured - secret "test-secret" configured