Validated on Version

-$ k3s version v1.33.3+k3s-462f4bc6 (462f4bc6)

Environment Details

Infrastructure
Cloud EC2 instance

Node(s) CPU architecture, OS, and Version:
rhel 9.5
AMD

Cluster Configuration:
1 node server

Steps to validate the fix

Install K3s server with config bellow

$ sudo bash -c 'cat <<EOF>/etc/rancher/k3s/config.yaml
> write-kubeconfig-mode: 644
> etcd-s3: true
> cluster-init: true
> etcd-snapshot-retention: 4
> etcd-s3-retention: 6
> etcd-s3-access-key: " "
> etcd-s3-secret-key: " + + "
> etcd-s3-region: "us-east-2"
> etcd-s3-bucket: " "
> etcd-snapshot-schedule-cron: "* * * * *"
> EOF'

Validate that under the cron time, the snapshot is saved to s3 and local
Validate that the retention is working as expected

Reproduction Issue:

Validation Results:

 
 ~$ k3s -v
k3s version v1.33.3+k3s-462f4bc6 (462f4bc6)
go version go1.24.4


######## ------- config.yaml ------- ######## 
$ sudo bash -c 'cat <<EOF>/etc/rancher/k3s/config.yaml
> write-kubeconfig-mode: 644
> etcd-s3: true
> cluster-init: true
> etcd-snapshot-retention: 4
> etcd-s3-retention: 6
> etcd-s3-access-key: " "
> etcd-s3-secret-key: " + + "
> etcd-s3-region: "us-east-2"
> etcd-s3-bucket: " "
> etcd-snapshot-schedule-cron: "* * * * *"
> EOF'


######## ------- journalctl logs  ------- ######## 

$ sudo journalctl -eu k3s | grep 'Applying snapshot retention='
 level=info msg="Applying snapshot retention=6 to snapshots stored in s3://{}}/on-demand"
 level=info msg="Applying snapshot retention=4 to local snapshots with prefix etcd-snapshot in /var/lib/rancher/k3s/server/db/snapshots"


 
######## ------- # ls /var/lib/rancher/k3s/server/db/snapshots/ ------- ######## 
 etcd-snapshot-ip-.-1755093602  etcd-snapshot-ip-.-1755093723
etcd-snapshot-ip-.-1755093544  etcd-snapshot-ip-.-1755093663


######## ------- etcd-snapshot list ------- ######## 
etcd-snapshot-ip-.-1755092943                        s3://fmoral1/etcd-snapshot-ip-.-1755092943                                    3788832  2025-08-13T13:49:03Z
etcd-snapshot-ip-.-1755093002                        s3://fmoral1/etcd-snapshot-ip-.-1755093002                                    3956768  2025-08-13T13:50:02Z
etcd-snapshot-ip-.-1755093061                        s3://fmoral1/etcd-snapshot-ip-.-1755093061                                    4096032  2025-08-13T13:51:01Z
etcd-snapshot-ip-.-1755093061                        file:///var/lib/rancher/k3s/server/db/snapshots/etcd-snapshot-ip-.-1755093061 4096032  2025-08-13T13:51:01Z
etcd-snapshot-ip-.-1755093121                        s3://fmoral1/etcd-snapshot-ip-.-1755093121                                    4259872  2025-08-13T13:52:01Z
etcd-snapshot-ip-.-1755093121                        file:///var/lib/rancher/k3s/server/db/snapshots/etcd-snapshot-ip-.-1755093121 4259872  2025-08-13T13:52:01Z
etcd-snapshot-ip-.-1755093185                        s3://fmoral1/etcd-snapshot-ip-.-1755093185                                    4403232  2025-08-13T13:53:05Z
etcd-snapshot-ip-.-1755093185                        file:///var/lib/rancher/k3s/server/db/snapshots/etcd-snapshot-ip-.-1755093185 4403232  2025-08-13T13:53:05Z
etcd-snapshot-ip-.-1755093242                        s3://fmoral1/etcd-snapshot-ip-.-1755093242                                    4550688  2025-08-13T13:54:02Z
etcd-snapshot-ip-.-1755093242                        file:///var/lib/rancher/k3s/server/db/snapshots/etcd-snapshot-ip-.-1755093242 4550688  2025-08-13T13:54:02Z

[Release-1.33] - Specific retention for s3 snapshots #12697

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