Kubernetes

Information

• Endpoint: k8s.fixme.ch
• Credentials are available in file k8s:/etc/kubernetes/admin.conf.
• Currently running on Bellatrix
• Backup: https://git.fixme.ch/Comite/fixme-kube-backup (restricted for secret access)

Services

• Some services that are deployed on our instance
  • Chat
  • Etherpad
  • Power monitoring
  • Fablab wiki
  • Led API endpoint
  • Trigger
  • MQTT gateway
  • gitlab: ongoing

Certificate expiration

Sometimes K8S is in the sauce, something like this might help regenerate the certs

# Service state
systemctl stop kubelet.service
systemctl restart docker.service

# Backup
rsync -av /etc/kubernetes/ /root/kubernetes-$(date +%s)/
rsync -av /var/lib/etcd/ /root/etcd-$(date +%s)/

cd /etc/kubernetes
rm {admin.conf,controller-manager.conf,kubelet.conf,scheduler.conf}

cd /etc/kubernetes/pki
rm {apiserver.crt,apiserver-etcd-client.key,apiserver-kubelet-client.crt,front-proxy-ca.crt,front-proxy-client.crt,front-proxy-client.key,front-proxy-ca.key,apiserver-kubelet-client.key,apiserver.key,apiserver-etcd-client.crt}

# Regen certificates
cd
kubeadm init phase certs all --apiserver-advertise-address 62.220.135.205 --ignore-preflight-errors=all
kubeadm init phase kubeconfig all
cp -i /etc/kubernetes/admin.conf $HOME/.kube/config

# Check states
kubeadm join 62.220.135.205:6443 --token XXX --discovery-token-ca-cert-hash YYY --ignore-preflight-errors=all
kubectl get nodes
kubectl get all