Doc updates for Ubuntu 22.04

README.md

@@ -66,12 +66,12 @@ sw to running VMs, e.g. with `ssh`.  [read more](doc/overlays.md).
 
 ### Execution environment and dependencies
 
-`Xcluster` is developed on `Ubuntu 18.04.1 LTS` and `Ubuntu 20.04.1 LTS`.
-It seems to work fine also on Ubuntu 16.04 LTS but it will probably
-not work on other distributions (mainly due to variations in
+`Xcluster` is developed on `Ubuntu 22.04 LTS` (>=7.0.0). It should
+also work on Ubuntu 20.04 LTS but this is not tested. It will
+probably not work on other distributions (mainly due to variations in
 libs). Xcluster can be started on [Fedora](doc/fedora.md) but this
 environment is not maintained. If you run on another distribution than
-Ubuntu 20.04 you *may* run into problems with pre-built images and
+Ubuntu 22.04 you *may* run into problems with pre-built images and
 cached overlays from the binary release when you add own programs
 (because of library version probems). In that case there may be no
 other option than to rebuild all images and overlays locally [from
@@ -99,7 +99,7 @@ sudo apt install -y xterm genisoimage jq screen
 ```
 
 For image handling you will also need
-[docker](https://www.digitalocean.com/community/tutorials/how-to-install-and-use-docker-on-ubuntu-18-04).
+[docker](https://www.digitalocean.com/community/tutorials/how-to-install-and-use-docker-on-ubuntu-22-04).
 
 
 #### Environment and default options

ovl-index.md

@@ -1,53 +1,58 @@
 # Overlay index
 
+ * [cert-manager](./ovl/cert-manager/README.md) 
  * [coredns](./ovl/coredns/README.md) 
  * [crio](./ovl/crio/README.md) 
  * [ctraffic](./ovl/ctraffic/README.md) 
- * [dpdk](./ovl/dpdk/README.md) 
+ * [dpdk](./ovl/dpdk/README.md) - Use DPDK in `xcluster` 
  * [env](./ovl/env/README.md) 
  * [etcd](./ovl/etcd/README.md) 
  * [frr](./ovl/frr/README.md) 
  * [gobgp](./ovl/gobgp/README.md) 
- * [images](./ovl/images/README.md) 
+ * [images](./ovl/images/README.md) - Create and handle K8s images
  * [iperf](./ovl/iperf/README.md) 
  * [iptools](./ovl/iptools/README.md) 
  * [istio](./ovl/istio/README.md) 
  * [k3s](./ovl/k3s/README.md) 
- * [k8s-base](./ovl/k8s-base/README.md) 
+ * [k8s-base](./ovl/k8s-base/README.md) - A K8s base image
+ * [k8s-cni-antrea](./ovl/k8s-cni-antrea/README.md) 
  * [k8s-cni-bridge](./ovl/k8s-cni-bridge/README.md) 
  * [k8s-cni-calico](./ovl/k8s-cni-calico/README.md) 
  * [k8s-cni-cilium](./ovl/k8s-cni-cilium/README.md) 
  * [k8s-cni-flannel](./ovl/k8s-cni-flannel/README.md) 
  * [k8s-cni-kube-router](./ovl/k8s-cni-kube-router/README.md) 
- * [k8s-cni-weave](./ovl/k8s-cni-weave/README.md) 
  * [k8s-cni-xcluster](./ovl/k8s-cni-xcluster/README.md) 
- * [k8s-old](./ovl/k8s-old/README.md) 
+ * [k8s-old](./ovl/k8s-old/README.md) - Use older K8s versions
+ * [k8s-pv](./ovl/k8s-pv/README.md) - K8s Persistent Volumes
  * [k8s-sctp](./ovl/k8s-sctp/README.md) 
  * [k8s-xcluster](./ovl/k8s-xcluster/README.md) - Kubernetes in `xcluster` with downloaded CNI-plugin.
- * [kubeadm](./ovl/kubeadm/README.md) 
+ * [kubeadm](./ovl/kubeadm/README.md) - Install K8s on `xcluster` with kubeadm
  * [kubernetes](./ovl/kubernetes/README.md) - A [Kubernetes](https://kubernetes.io/) cluster with built-in CNI-plugin.
- * [load-balancer](./ovl/load-balancer/README.md) 
- * [lspci](./ovl/lspci/README.md) 
+ * [load-balancer](./ovl/load-balancer/README.md) - Different LB experiments
+ * [lspci](./ovl/lspci/README.md) - Load the `lspci` database in `xcluster`
  * [mconnect](./ovl/mconnect/README.md) - Manifests for [mconnect](https://github.com/Nordix/mconnect)
  * [metallb](./ovl/metallb/README.md) 
+ * [mserver](./ovl/mserver/README.md) - A generic K8s server image
  * [mtu](./ovl/mtu/README.md) 
- * [multus](./ovl/multus/README.md) 
+ * [multus](./ovl/multus/README.md) - Use `multus` in `xcluster`
  * [network-topology](./ovl/network-topology/README.md) 
  * [nfproxy](./ovl/nfproxy/README.md) 
  * [nsm](./ovl/nsm/README.md) 
+ * [ovs](./ovl/ovs/README.md) 
  * [podsec](./ovl/podsec/README.md) 
  * [private-reg](./ovl/private-reg/README.md) 
  * [qemu-sriov](./ovl/qemu-sriov/README.md) 
  * [sctp](./ovl/sctp/README.md) 
  * [skopeo](./ovl/skopeo/README.md) 
+ * [spire](./ovl/spire/README.md) 
  * [systemd](./ovl/systemd/README.md) 
- * [tap-scrambler](./ovl/tap-scrambler/README.md) 
- * [test](./ovl/test/README.md) 
- * [test-template](./ovl/test-template/README.md) 
- * [timezone](./ovl/timezone/README.md) 
+ * [tap-scrambler](./ovl/tap-scrambler/README.md) - Scramble traffic for test purposes
+ * [test](./ovl/test/README.md) - The `xcluster` test system (shell based)
+ * [test-template](./ovl/test-template/README.md)
+ * [timezone](./ovl/timezone/README.md) - Set your timezone
  * [udp-test](./ovl/udp-test/README.md) 
  * [usrsctp](./ovl/usrsctp/README.md) 
- * [virtualbox](./ovl/virtualbox/README.md) 
+ * [virtualbox](./ovl/virtualbox/README.md) - Create a VirtualBox image
  * [wireguard](./ovl/wireguard/README.md) 
- * [xdp](./ovl/xdp/README.md) 
- * [xnet](./ovl/xnet/README.md) 
+ * [xdp](./ovl/xdp/README.md)
+ * [xnet](./ovl/xnet/README.md) - eXtended net. Obsloleted by `network-topology`