- Kubeadm: during execution of the "check expiration" command, treat the etcd CA as external if there is a missing etcd CA key file (etcd/ca.key) and perform the proper validation on certificates signed by the etcd CA. Additionally, make sure that the CA for all entries in the output table is included - for both certificates on disk and in kubeconfig files. ([#106923](https://github.com/kubernetes/kubernetes/pull/106923), [@neolit123](https://github.com/neolit123)) [SIG Cluster Lifecycle]...

### **Network**

*   NetworkPolicy objects are now stored in etcd in v1 format. After you upgrade to version 1.9, make sure that all NetworkPolicy objects are migrated to v1. ([#51955](https://github.com/kubernetes/kubernetes/pull/51955), [@danwinship](https://github.com/danwinship))

*   `tf.math`

		}
		replLogOnceIf(context.Background(), fmt.Errorf("unable to initialize site replication subsystem: (%w)", err), "site-relication-init")

		duration := max(time.Duration(r.Float64()*float64(time.Minute)),
			// Make sure to sleep at least a second to avoid high CPU ticks.
			time.Second)
		time.Sleep(duration)
	}
	c.RLock()
	defer c.RUnlock()
	if c.enabled {
		logger.Info("Cluster replication initialized")
	}

- Make sure auto-mounted subpath mount source is already mounted ([#112499](https://github.com/kubernetes/kubernetes/pull/112499), [@andyzhangx](https://github.com/andyzhangx)) [SIG Storage]

## Dependencies

### Added

- Fixed attaching volumes after detach errors. Now volumes that failed to detach are not treated as attached. Kubernetes will make sure they are fully attached before they can be used by pods. ([#120595](https://github.com/kubernetes/kubernetes/pull/120595), [@jsafrane](https://github.com/jsafrane))

- The feature-gate CSIMigrationPortworx was promoted to beta in Kubernetes 1.25, but turned off by default. In 1.31, it was turned on by default. Before upgrading to 1.31, please make sure that the corresponding portworx csi driver is installed if you are using Portworx. ([#125016](https://github.com/kubernetes/kubernetes/pull/125016), [@carlory](https://github.com/carlory)) [SIG Storage]

- Kubeadm: make sure the etcd static pod startup probe uses /health?serializable=false while the liveness probe uses /health?serializable=true&exclude=NOSPACE. The NOSPACE exclusion would allow administrators to address space issues one member at a time. ([#110744](ht...

--get-active-zones ``` This command gets the active zone(s). Now, apply port rules to the relevant zones returned above. For example if the zone is `public`, use ```sh firewall-cmd --zone=public --add-port=9000/tcp --permanent ``` Note that `permanent` makes sure the rules are persistent across firewall start, restart or reload. Finally reload the firewall for changes to take effect. ```sh firewall-cmd --reload ``` ### iptables For hosts with iptables enabled (RHEL, CentOS, etc), you can use `iptables` command...

- Kube-apiserver: Made sure that when `--requestheader-client-ca-file` and `--client-ca-file` contain overlapping certificates, `--requestheader-allowed-names` must be specified so that regular client certificates cannot set authenticating proxy headers for arbitrary users. ...