[Release-1.29] - K3s startup sequencing is inefficient

[brandond]

Backport fix for K3s startup sequencing is inefficient

• K3s startup sequencing is inefficient #11896

[fmoral2]

-All tests from https://github.com/rancher/distros-test-framework/blob/main/entrypoint/validatecluster/validatecluster_test.go
PASS

Validated on Version:

-$ k3s version v1.29.15+k3s-5aac2aaf (5aac2aaf)

Environment Details

Infrastructure
Cloud EC2 instance

Node(s) CPU architecture, OS, and Version:
NAME="SLES"
VERSION="15-SP5"
VERSION_ID="15.5"
PRETTY_NAME="SUSE Linux Enterprise Server 15 SP5"
ID="sles"
ID_LIKE="suse"

Cluster Configuration:
1 node servers

Steps to validate the fix

1.Install k3s
2. Validates start up logs
3. Check the API server readiness logs
4. Validate basic tests

Validation Results:

k3s version v1.29.15+k3s-5aac2aaf (5aac2aaf)


showing the new logs for api server readiness.
 ~$ sudo journalctl -u k3s | grep -B 10  -E "server readiness" 
Apr 24 09:24:09 ip-172-31-23-55 k3s[1773]: time="2025-04-24T09:24:09Z" level=info msg="certificate CN=system:kube-proxy signed by CN=k3s-client-ca@1745486648: notBefore=2025-04-24 09:24:08 +0000 UTC notAfter=2026-04-24 09:24:09 +0000 UTC"
Apr 24 09:24:10 ip-172-31-23-55 k3s[1773]: time="2025-04-24T09:24:10Z" level=info msg="certificate CN=system:k3s-controller signed by CN=k3s-client-ca@1745486648: notBefore=2025-04-24 09:24:08 +0000 UTC notAfter=2026-04-24 09:24:10 +0000 UTC"
Apr 24 09:24:10 ip-172-31-23-55 k3s[1773]: time="2025-04-24T09:24:10Z" level=info msg="Module overlay was already loaded"
Apr 24 09:24:10 ip-172-31-23-55 k3s[1773]: time="2025-04-24T09:24:10Z" level=info msg="Module br_netfilter was already loaded"
Apr 24 09:24:10 ip-172-31-23-55 k3s[1773]: time="2025-04-24T09:24:10Z" level=info msg="Set sysctl 'net/netfilter/nf_conntrack_tcp_timeout_close_wait' to 3600"
Apr 24 09:24:10 ip-172-31-23-55 k3s[1773]: time="2025-04-24T09:24:10Z" level=info msg="Set sysctl 'net/ipv4/conf/all/forwarding' to 1"
Apr 24 09:24:10 ip-172-31-23-55 k3s[1773]: time="2025-04-24T09:24:10Z" level=info msg="Set sysctl 'net/netfilter/nf_conntrack_max' to 131072"
Apr 24 09:24:10 ip-172-31-23-55 k3s[1773]: time="2025-04-24T09:24:10Z" level=info msg="Set sysctl 'net/netfilter/nf_conntrack_tcp_timeout_established' to 86400"
Apr 24 09:24:10 ip-172-31-23-55 k3s[1773]: time="2025-04-24T09:24:10Z" level=info msg="Logging containerd to /var/lib/rancher/k3s/agent/containerd/containerd.log"
Apr 24 09:24:10 ip-172-31-23-55 k3s[1773]: time="2025-04-24T09:24:10Z" level=info msg="Running containerd -c /var/lib/rancher/k3s/agent/etc/containerd/config.toml -a /run/k3s/containerd/containerd.sock --state /run/k3s/containerd --root /var/lib/rancher/k3s/agent/containerd"
Apr 24 09:24:10 ip-172-31-23-55 k3s[1773]: time="2025-04-24T09:24:10Z" level=info msg="Polling for API server readiness: GET /readyz failed: the server is currently unable to handle the request"
--
Apr 24 09:24:12 ip-172-31-23-55 k3s[1773]: I0424 09:24:12.583942    1773 handler.go:275] Adding GroupVersion apps v1 to ResourceManager
Apr 24 09:24:12 ip-172-31-23-55 k3s[1773]: W0424 09:24:12.583978    1773 genericapiserver.go:742] Skipping API apps/v1beta2 because it has no resources.
Apr 24 09:24:12 ip-172-31-23-55 k3s[1773]: W0424 09:24:12.583988    1773 genericapiserver.go:742] Skipping API apps/v1beta1 because it has no resources.
Apr 24 09:24:12 ip-172-31-23-55 k3s[1773]: I0424 09:24:12.584930    1773 handler.go:275] Adding GroupVersion admissionregistration.k8s.io v1 to ResourceManager
Apr 24 09:24:12 ip-172-31-23-55 k3s[1773]: W0424 09:24:12.584953    1773 genericapiserver.go:742] Skipping API admissionregistration.k8s.io/v1beta1 because it has no resources.
Apr 24 09:24:12 ip-172-31-23-55 k3s[1773]: W0424 09:24:12.584962    1773 genericapiserver.go:742] Skipping API admissionregistration.k8s.io/v1alpha1 because it has no resources.
Apr 24 09:24:12 ip-172-31-23-55 k3s[1773]: I0424 09:24:12.585571    1773 handler.go:275] Adding GroupVersion events.k8s.io v1 to ResourceManager
Apr 24 09:24:12 ip-172-31-23-55 k3s[1773]: W0424 09:24:12.585594    1773 genericapiserver.go:742] Skipping API events.k8s.io/v1beta1 because it has no resources.
Apr 24 09:24:12 ip-172-31-23-55 k3s[1773]: I0424 09:24:12.589008    1773 handler.go:275] Adding GroupVersion apiregistration.k8s.io v1 to ResourceManager
Apr 24 09:24:12 ip-172-31-23-55 k3s[1773]: W0424 09:24:12.589037    1773 genericapiserver.go:742] Skipping API apiregistration.k8s.io/v1beta1 because it has no resources.
Apr 24 09:24:12 ip-172-31-23-55 k3s[1773]: time="2025-04-24T09:24:12Z" level=info msg="Polling for API server readiness: GET /readyz failed: unknown"
 
 


    ```