Rancher 2.5 etcd container lost

Running a 13 nodes rancher 2.5.15 cluster (k8s v1.20.15) with 3 etcd, after a etcd node crash, I lost the container running it. The 2 others etcd are fine, the whole cluster is up and running.
How can I restart the missing container (from image rancher/mirrored-coreos-etcd:v3.4.15-rancher1)? I tried by replicating the command line I see on the working etcd nodes, adjusting the command line to correct IPs, but it seems I have to generate the certificates files, and I don’t know how to proceed when starting the container.
Any ideas? Thank you :slight_smile: