Completek8s Classroomnotes 22/Aug/2023

Backup and restore etcd

• Process for backing up etcd cluster
  

Backup etcd

• Create some k8s deployment

---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
  labels:
    app: nginx
spec:
  replicas: 3
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.14.2
        ports:
        - containerPort: 80

* check etcdctl version

etcdctl version

* Etcd pod is deployed as a Pod in kube-sytem namespace

* Lets describe pod kubectl describe pod etcd-controlplane -n kube-system

* Refer Here for official docs
* Lets create a snapshot

sudo ETCDCTL_API=3 etcdctl --cacert=/etc/kubernetes/pki/etcd/ca.crt \
    --cert=/etc/kubernetes/pki/etcd/server.crt \
    --key=/etc/kubernetes/pki/etcd/server.key \
    snapshot save /opt/etcd-backup.db

Restore etcd

• command to restore the snapshot

sudo ETCDCTL_API=3 etcdctl --data-dir=/var/lib/from-backup snapshot restore /opt/etcd-backup.db

• Change the manifest file in /etc/manifests to point to new location