September 22nd, 2019
In Technology
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If you enjoy this article, see the other most popular articles
If you enjoy this article, see the other most popular articles
If you enjoy this article, see the other most popular articles
Making a snapshot of etcd to backup Kubernetes
(written by lawrence krubner, however indented passages are often quotes). You can contact lawrence at: lawrence@krubner.com, or follow me on Twitter.
Interesting, but I worry about the complexity of what is going on here:
etcd snapshot explanation
The second command needs a bit more explaining. First of all, the idea is to create a snapshot of the etcd database. This is done by communicating with the running etcd instance in Kubernetes and asking it to create a snapshot. The reason for the very long command is basically to avoid messing with etcd running in Kubernetes as much as possible. We are launching a separate container using the same docker image that kubeadm used for setting up the cluster (k8s.gcr.io/etcd-amd64:3.2.18). But in order to communicate with the etcd pod in Kubernetes, we need to:
Use the host network in order to access 127.0.0.1:2379, where etcd is exposed (–network host)
Mount the backup folder where we want to save the snapshot (-v $(pwd)/backup:/backup)
Mount the folder containing the certificates needed to access etcd (-v /etc/kubernetes/pki/etcd:/etc/kubernetes/pki/etcd)
Specify the correct etcd API version as environment variable (–env ETCDCTL_API=3)
The actual command for creating a snapshot (etcdctl snapshot save /backup/etcd-snapshot-latest.db)
Some flags for the etcdctl command
Specify where to connect to (–endpoints=https://127.0.0.1:2379)
Specify certificates to use (–cacert=…, –cert=…, –key=…)
So we start a docker container with the etcdctl tool installed. We tell it to create a snapshot of the etcd instance running in the Kubernetes cluster and store it in a backup folder that we mount from the host.
Post external references
- 1
https://elastisys.com/2018/12/10/backup-kubernetes-how-and-why/
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