kubeadm

What’s the kube-public namespace for?

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That namespace exists in clusters created with kubeadm for now. It contains a single ConfigMap object, cluster-info, that aids discovery and security bootstrap (basically, contains the CA for the cluster and such). This object is readable without authentication. If you are courious: $ kubectl get configmap -n kube-public cluster-info -o yaml There are more details … Read more

Failed create pod sandbox: rpc error: code = Unknown desc = NetworkPlugin cni failed to set up pod network [closed]

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When I used calico as CNI and I faced a similar issue. The container remained in creating state, I checked for /etc/cni/net.d and /opt/cni/bin on master both are present but not sure if this is required on worker node as well. root@KubernetesMaster:/opt/cni/bin# kubectl get pods NAME READY STATUS RESTARTS AGE nginx-5c7588df-5zds6 0/1 ContainerCreating 0 21m … Read more

Invalid x509 certificate for kubernetes master

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One option is to tell kubectl that you don’t want the certificate to be validated. Obviously this brings up security issues but I guess you are only testing so here you go: kubectl –insecure-skip-tls-verify –context=employee-context get pods The better option is to fix the certificate. Easiest if you reinitialize the cluster by running kubeadm reset … Read more

kubeadm init shows kubelet isn’t running or healthy [closed]

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I faced similar issue recently. The problem was cgroup driver. Kubernetes cgroup driver was set to systems but docker was set to systemd. So I created /etc/docker/daemon.json and added below: { “exec-opts”: [“native.cgroupdriver=systemd”] } Then sudo systemctl daemon-reload sudo systemctl restart docker sudo systemctl restart kubelet Run kubeadm init or kubeadm join again.

What is the equivalent for depends_on in kubernetes

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That’s the beauty of Docker Compose and Docker Swarm… Their simplicity. We came across this same Kubernetes shortcoming when deploying the ELK stack. We solved it by using a side-car (initContainer), which is just another container in the same pod thats run first, and when it’s complete, kubernetes automatically starts the [main] container. We made … Read more

Nginx Ingress Controller – Failed Calling Webhook

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Another option you have is to remove the Validating Webhook entirely: kubectl delete -A ValidatingWebhookConfiguration ingress-nginx-admission I found I had to do that on another issue, but the workaround/solution works here as well. This isn’t the best answer; the best answer is to figure out why this doesn’t work. But at some point, you live … Read more

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)