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03 - .etcd.md

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ETCD

  • ETCD stores info from:

    • Nodes
    • PODs
    • Configs
    • Secrets
    • Accounts
    • Roles
    • Bindings
    • Others...

  • Some commands:

    • etcdctl snapshot save /path/bkp.db
    • etcdctl endpoint health
    • etcdctl get
    • etcdctl put

  • bkp and restore:

    • ./backup-restore.md

  • to check if the conf is external:

    • go to /etc/kubernetes/manifests/
    • open the file kube-apiserver.yaml
      • and look for --etcd-servers=https://some-ip:2379

  • Check conf from a etcd-server:

    • ps -ef | grep etcd

  • List Cluster Nodes:

    export ETCDCTL_API=3
etcdctl \
    --endpoints=https://127.0.0.1:2379 \
    --cert=/etc/etcd/pki/etcd.pem \
    --key=/etc/etcd/pki/etcd-key.pem  \
    --cacert=/etc/etcd/pki/ca.pem \
    member list

Backup and Restore

  • Backup:

    export ETCDCTL_API=3 
etcdctl --endpoints $ENDPOINTS \
  --cert=/etc/kubernetes/pki/etcd/server.crt \
  --key=/etc/kubernetes/pki/etcd/server.key \
  --cacert=/etc/kubernetes/pki/etcd/ca.crt \
  snapshot save <output>

  • Restore:

    export ETCDCTL_API=3 
etcdctl --endpoints $ENDPOINTS \
  --cert=/etc/kubernetes/pki/etcd/server.crt \
  --key=/etc/kubernetes/pki/etcd/server.key \
  --cacert=/etc/kubernetes/pki/etcd/ca.crt \
  --data-dir=/var/lib/etcd-my-bkp \
  snapshot restore <output>
    • Go to /etc/kubernetes/manifests/etcd.yaml, edit it and change the Volume with ETCD path to the new one(--data-dir) /var/lib/etcd-my-bkp, save it and wait some time.
      • Example: 
        - hostPath:
  path: /var/lib/etcd-my-bkp # here
  type: DirectoryOrCreate