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Improve UDN styling
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‎content/networking/udn/index.md‎

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title: User-defined networks
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linktitle: User-defined networks
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description: User-defined networks (UDN)
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tags: ['UDN','v4.18']
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tags: ['UDN','v4.19']
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---
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# User-defined networks (UDN)
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|Component|Version|
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|---|---|
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|OpenShift|v4.18.8|
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|OpenShift Virt|v4.18.2|
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|OpenShift|v4.19.1|
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|OpenShift Virt|v4.19.0|
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![](overview.drawio)
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|tanent-3|namespace-3|blue|CUDN (cudn-3)|`203.0.113.0/24`|
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|tanent-4|namespace-4|orange|CUDN (cudn-3)|`203.0.113.0/24`|
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## Deploy
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```shell
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oc apply -k overlays/tentant-1
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oc apply -k overlays/tentant-2
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oc apply -k overlays/tentant-3
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```
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```shell
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$ oc get namespaces -l tentant -L tentant
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NAME STATUS AGE TENTANT
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namespace-1 Active 4m1s tentant-1
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namespace-2 Active 3m51s tentant-2
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namespace-3 Active 3m14s tentant-3
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namespace-4 Active 3m13s tentant-3
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$ oc get pods -o go-template-file=podlist-with-p-udn.gotemplate -A -l tentant | jq ' (.[] | [.node,.namespace, .udn[1].ips[0], .udn[0].ips[0], .name]) | @tsv' -r
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ocp1-worker-0 namespace-1 192.0.2.10 10.131.0.201 agnhost-7f79bb7dc-t8rfg
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ocp1-worker-0 namespace-1 192.0.2.9 10.131.0.202 rhel-support-tools-7c89889f94-wq2gj
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ocp1-worker-1 namespace-1 192.0.2.17 10.128.3.55 simple-http-server-bb9ccffd4-74j47
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ocp1-worker-2 namespace-1 192.0.2.11 10.129.2.131 simple-http-server-bb9ccffd4-jq4bb
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ocp1-worker-0 namespace-1 192.0.2.16 10.131.0.223 simple-http-server-bb9ccffd4-xll6x
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ocp1-worker-2 namespace-1 192.0.2.19 10.129.2.143 virt-launcher-simple-httpd-vm-5wxpj
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ocp1-worker-0 namespace-2 10.255.2.6 10.131.0.220 agnhost-59964fb864-hp46z
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ocp1-worker-0 namespace-2 10.255.2.8 10.131.0.221 rhel-support-tools-7cfb68d78f-89jkl
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ocp1-worker-0 namespace-2 10.255.2.7 10.131.0.222 simple-http-server-7c567b8c4c-2pph6
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ocp1-worker-1 namespace-2 10.255.3.4 10.128.3.54 simple-http-server-7c567b8c4c-brqtl
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ocp1-worker-2 namespace-2 10.255.0.4 10.129.2.137 simple-http-server-7c567b8c4c-mjgwc
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ocp1-worker-1 namespace-2 10.255.3.8 10.128.3.62 virt-launcher-simple-httpd-vm-w6hwn
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ocp1-worker-2 namespace-3 203.0.113.22 10.129.2.135 agnhost-f4b987769-kcmvs
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ocp1-worker-0 namespace-3 203.0.113.25 10.131.0.207 rhel-support-tools-5b999555b4-w2qv5
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ocp1-worker-2 namespace-3 203.0.113.23 10.129.2.134 simple-http-server-6b84977478-7kkhd
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ocp1-worker-1 namespace-3 203.0.113.29 10.128.3.56 simple-http-server-6b84977478-pbj4d
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ocp1-worker-0 namespace-3 203.0.113.30 10.131.0.224 simple-http-server-6b84977478-wn6kl
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ocp1-worker-0 namespace-3 203.0.113.39 10.131.1.39 virt-launcher-simple-httpd-vm-h8xr7
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ocp1-worker-0 namespace-4 203.0.113.26 10.131.0.203 agnhost-f4b987769-vxtl7
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ocp1-worker-0 namespace-4 203.0.113.24 10.131.0.204 rhel-support-tools-5b999555b4-5kgbs
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ocp1-worker-0 namespace-4 203.0.113.33 10.131.0.225 simple-http-server-6b84977478-mqhj4
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ocp1-worker-2 namespace-4 203.0.113.21 10.129.2.133 simple-http-server-6b84977478-rnc2c
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ocp1-worker-1 namespace-4 203.0.113.35 10.128.3.57 simple-http-server-6b84977478-v7xhz
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ocp1-worker-2 namespace-4 203.0.113.40 10.129.2.142 virt-launcher-simple-httpd-vm-lk4rc
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$ oc get vmi -l tentant -A
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NAMESPACE NAME AGE PHASE IP NODENAME READY
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namespace-1 simple-httpd-vm 93s Running 192.0.2.19 ocp1-worker-2 True
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namespace-2 simple-httpd-vm 87s Running 10.255.3.8 ocp1-worker-1 True
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namespace-3 simple-httpd-vm 2m43s Running 203.0.113.39 ocp1-worker-0 True
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namespace-4 simple-httpd-vm 2m42s Running 203.0.113.40 ocp1-worker-2 True
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```
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## Deploy
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* Why is ip's of UDN nocht in pod status `podIPs` ?
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=== ":material-keyboard: Command"
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```shell
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oc apply -k {{ config.repo_url }}/content/{{ page.url }}manifests/overlays/tentant-1
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oc apply -k {{ config.repo_url }}/content/{{ page.url }}manifests/overlays/tentant-2
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oc apply -k {{ config.repo_url }}/content/{{ page.url }}manifests/overlays/tentant-3
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```
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## Gather information
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### Namespace
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=== ":material-keyboard: Command"
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```shell
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oc get namespaces -l tentant -L tentant
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```
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=== ":material-monitor: Output"
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```shell
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$ oc get namespaces -l tentant -L tentant
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NAME STATUS AGE TENTANT
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namespace-1 Active 4m1s tentant-1
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namespace-2 Active 3m51s tentant-2
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namespace-3 Active 3m14s tentant-3
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namespace-4 Active 3m13s tentant-3
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```
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### Pods
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=== ":material-keyboard: Command"
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```shell
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oc get pods -o go-template-file=podlist-with-p-udn.gotemplate -A -l tentant | jq ' (.[] | [.node,.namespace, .udn[1].ips[0], .udn[0].ips[0], .name])| @tsv' -r
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```
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=== ":material-monitor: Output"
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```shell
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$ oc get pods -o go-template-file=podlist-with-p-udn.gotemplate -A -l tentant | jq ' (.[] | [.node,.namespace, .udn[1].ips[0], .udn[0].ips[0], .name])| @tsv' -r
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ocp1-worker-2 namespace-1 192.0.2.21 10.129.2.17 agnhost-9d56666c9-f8mjj
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ocp1-worker-2 namespace-1 192.0.2.22 10.129.2.16 rhel-support-tools-86bf5b4d7d-6p96k
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ocp1-worker-1 namespace-1 192.0.2.15 10.128.2.56 simple-http-server-794b76798d-74hn9
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ocp1-worker-0 namespace-1 192.0.2.25 10.131.0.67 simple-http-server-794b76798d-h7lsm
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ocp1-worker-2 namespace-1 192.0.2.14 10.129.2.11 simple-http-server-794b76798d-nl2qh
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ocp1-worker-2 namespace-1 192.0.2.13 10.129.2.27 virt-launcher-simple-httpd-vm-q7mh4
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ocp1-worker-2 namespace-2 10.255.3.9 10.129.2.21 agnhost-957d4f456-gc2wf
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ocp1-worker-2 namespace-2 10.255.3.6 10.129.2.20 rhel-support-tools-9cb87db57-tqr2q
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ocp1-worker-0 namespace-2 10.255.5.5 10.131.0.68 simple-http-server-645945f9-2rp6t
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ocp1-worker-1 namespace-2 10.255.2.4 10.128.2.57 simple-http-server-645945f9-2v5jb
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ocp1-worker-2 namespace-2 10.255.3.4 10.129.2.13 simple-http-server-645945f9-622d6
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ocp1-worker-2 namespace-2 10.255.3.13 10.129.2.26 virt-launcher-simple-httpd-vm-222c2
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ocp1-worker-2 namespace-3 203.0.113.50 10.129.2.15 agnhost-6d845f6977-nhfzc
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ocp1-worker-2 namespace-3 203.0.113.59 10.129.2.22 rhel-support-tools-5455498cbd-6j9gv
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ocp1-worker-2 namespace-3 203.0.113.42 10.129.2.12 simple-http-server-657fb44bfd-8nx28
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ocp1-worker-0 namespace-3 203.0.113.51 10.131.0.66 simple-http-server-657fb44bfd-c878t
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ocp1-worker-1 namespace-3 203.0.113.44 10.128.2.58 simple-http-server-657fb44bfd-l9zdx
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ocp1-worker-2 namespace-3 203.0.113.23 10.129.2.24 virt-launcher-simple-httpd-vm-x4t6n
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ocp1-worker-2 namespace-4 203.0.113.55 10.129.2.18 agnhost-6d845f6977-c9449
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ocp1-worker-2 namespace-4 203.0.113.56 10.129.2.19 rhel-support-tools-5455498cbd-bd725
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ocp1-worker-1 namespace-4 203.0.113.60 10.128.2.59 simple-http-server-657fb44bfd-5qv9v
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ocp1-worker-0 namespace-4 203.0.113.41 10.131.0.65 simple-http-server-657fb44bfd-6hg4c
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ocp1-worker-2 namespace-4 203.0.113.43 10.129.2.14 simple-http-server-657fb44bfd-djgql
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ocp1-worker-2 namespace-4 203.0.113.24 10.129.2.23 virt-launcher-simple-httpd-vm-99p7x
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```
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### VirtualMachineInstances (VMI)
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=== ":material-keyboard: Command"
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```shell
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oc get vmi -l tentant -A
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```
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=== ":material-monitor: Output"
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```shell
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$ oc get vmi -l tentant -A
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NAMESPACE NAME AGE PHASE IP NODENAME READY
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namespace-1 simple-httpd-vm 5m30s Running 192.0.2.13 ocp1-worker-2 True
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namespace-2 simple-httpd-vm 5m32s Running 10.255.3.13 ocp1-worker-2 True
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namespace-3 simple-httpd-vm 5m37s Running 203.0.113.23 ocp1-worker-2 True
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namespace-4 simple-httpd-vm 5m39s Running 203.0.113.24 ocp1-worker-2 True
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```
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## Testing
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curl: (7) Failed to connect to simple-httpd-vm.namespace-3.svc.cluster.local port 80: Connection refused
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```
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* ❌ Pod -> Service -> VM with L2Bridge in UDN
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* ✅ Pod -> Service -> Pod
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* ❌ Pod :arrow_right: Service :arrow_right: VM with L2Bridge in UDN
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* ✅ Pod :arrow_right: Service :arrow_right: Pod
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### ✅ Ingress
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* Tentant 2 is Layer 3
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### ⏱️ Localnet (Available with 4.19)
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TBD
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## ❓ Open question
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* Why UDN ip is not represented in pod status ips?

‎mkdocs.yml‎

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# Repository
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repo_name: openshift-examples/web
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repo_url: https://github.com/openshift-examples/web
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edit_uri: edit/master/content/
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edit_uri: edit/main/content/
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# Copyright
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copyright: <a href="/impressum/">Impressum</a>
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check_paths: true
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- meta
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- attr_list
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- pymdownx.emoji:
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emoji_index: !!python/name:material.extensions.emoji.twemoji
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emoji_generator: !!python/name:material.extensions.emoji.to_svg
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plugins:
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- search

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