Difference between revisions of "Kubernetes"
From Fixme.ch
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* Currently running on [[Bellatrix]] | * Currently running on [[Bellatrix]] | ||
* Backup: https://git.fixme.ch/Comite/fixme-kube-backup (restricted for secret access) | * 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|Power monitoring]] | ||
| + | ** Fablab wiki | ||
| + | ** [[LED_Lighting|Led API endpoint]] | ||
| + | ** [[Trigger]] | ||
| + | ** [[MQTT|MQTT gateway]] | ||
| + | ** gitlab: ongoing | ||
| + | |||
| + | === Add your own Service === | ||
| + | |||
| + | A service is composed of: | ||
| + | * A deployment | ||
| + | * A service | ||
| + | * An ingress controller | ||
| + | |||
| + | at minimum | ||
| + | |||
| + | ==== SSL ==== | ||
| + | |||
| + | * We use cert-manager to manage LetsEncrypt certs, you only need to add this annotation to your Ingress Controller for it to manage your cert, | ||
| + | <pre> | ||
| + | ubuntu@k8s:~$ k edit -n mattermost ingress/mattermost-ingress | ||
| + | [...] | ||
| + | metadata: | ||
| + | annotations: | ||
| + | cert-manager.io/cluster-issuer: letsencrypt | ||
| + | [...] | ||
| + | </pre> | ||
| + | |||
| + | === Debug === | ||
| + | ==== Access impossible ==== | ||
| + | |||
| + | Sometimes the eth interface is in the sauce (to investigate), you have to reconfigure it. | ||
| + | |||
| + | <pre> | ||
| + | ubuntu@k8s:~$ sudo ip addr add 62.220.135.219/32 dev ens6 | ||
| + | </pre> | ||
| + | |||
| + | It should look like this | ||
| + | <pre> | ||
| + | ubuntu@k8s:~$ ip -4 a show ens6 | ||
| + | 2: ens6: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000 | ||
| + | inet 62.220.135.205/26 brd 62.220.135.255 scope global ens6 | ||
| + | valid_lft forever preferred_lft forever | ||
| + | inet 62.220.135.219/32 scope global ens6 | ||
| + | valid_lft forever preferred_lft forever | ||
| + | </pre> | ||
| + | |||
| + | ==== Certificate expiration ==== | ||
| + | |||
| + | Sometimes K8S is in the sauce, something like this might help regenerate the certs | ||
| + | |||
| + | <pre> | ||
| + | # 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 $HOME/.kube/config | ||
| + | |||
| + | # Check states | ||
| + | kubeadm join 62.220.135.205:6443 --token XXX --discovery-token-ca-cert-hash YYY --ignore-preflight-errors=all | ||
| + | kubectl get nodes | ||
| + | kubectl get all | ||
| + | </pre> | ||
Latest revision as of 22:07, 8 August 2021
Contents
Kubernetes @ FIXME
Information
- Endpoint: k8s.fixme.ch
- Credentials are available in file k8s:/etc/kubernetes/admin.conf.
- Currently running on Bellatrix
- Backup: https://git.fixme.ch/Comite/fixme-kube-backup (restricted for secret access)
Services
- Some services that are deployed on our instance
- Chat
- Etherpad
- Power monitoring
- Fablab wiki
- Led API endpoint
- Trigger
- MQTT gateway
- gitlab: ongoing
Add your own Service
A service is composed of:
- A deployment
- A service
- An ingress controller
at minimum
SSL
- We use cert-manager to manage LetsEncrypt certs, you only need to add this annotation to your Ingress Controller for it to manage your cert,
ubuntu@k8s:~$ k edit -n mattermost ingress/mattermost-ingress
[...]
metadata:
annotations:
cert-manager.io/cluster-issuer: letsencrypt
[...]
Debug
Access impossible
Sometimes the eth interface is in the sauce (to investigate), you have to reconfigure it.
ubuntu@k8s:~$ sudo ip addr add 62.220.135.219/32 dev ens6
It should look like this
ubuntu@k8s:~$ ip -4 a show ens6
2: ens6: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
inet 62.220.135.205/26 brd 62.220.135.255 scope global ens6
valid_lft forever preferred_lft forever
inet 62.220.135.219/32 scope global ens6
valid_lft forever preferred_lft forever
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
