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ocp4-docs

Documentation for CentOS CI Infra initiative - OpenShift 4.4 deployment on Baremetal

Spike: Investigate adding routes from apps.ci.centos.org

The Ingress Operator[1] manages IngressController resources which will allow us to achieve[3] this on Openshift 4.

Resources

[1] https://docs.openshift.com/container-platform/4.4/networking/ingress-operator.html
[2] https://rcarrata.com/openshift/ocp4_route_sharding/
[3] https://projects.engineering.redhat.com/browse/CPE-764

POC

Performed the following steps to achieve goal:

-rw-rw-r--. 1 dkirwan dkirwan 1060 Jul  6 18:12 deployment.yaml
-rw-rw-r--. 1 dkirwan dkirwan  286 Jul  6 17:13 ingresscontroller.yaml
-rw-rw-r--. 1 dkirwan dkirwan  336 Jul  6 17:53 route.yaml
-rw-rw-r--. 1 dkirwan dkirwan  273 Jul  6 17:58 service.yaml

Created an IngressController which creates 2 router replicas and configured to manage Routes which point at *.apps.ci.centos.org. It also has a routeSelector to match labels type: sharded
```
routeSelector:
  matchLabels:
    type: sharded
```
Created a Deployment with simple app.
Created Service and Route to expose the app externally at ingress-controller-test.apps.ci.centos.org.
Route has been given a label: type: sharded
Used dig to retrieve the public IP address of the cluster ``` dig console-openshift-console.apps.ocp.stg.ci.centos.org

; «» DiG 9.11.18-RedHat-9.11.18-1.fc32 «» console-openshift-console.apps.ocp.stg.ci.centos.org ;; global options: +cmd ;; Got answer: ;; -»HEADER«- opcode: QUERY, status: NOERROR, id: 21722 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 4096 ;; QUESTION SECTION: ;console-openshift-console.apps.ocp.stg.ci.centos.org. IN A

;; ANSWER SECTION: console-openshift-console.apps.ocp.stg.ci.centos.org. 600 IN A 8.43.84.237

;; Query time: 77 msec ;; SERVER: 10.38.5.26#53(10.38.5.26) ;; WHEN: Mon Jul 06 18:43:35 IST 2020 ;; MSG SIZE rcvd: 97

- Configured my `/etc/hosts` file accordingly:

cat /etc/hosts 127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4 ::1 localhost localhost.localdomain localhost6 localhost6.localdomain6 8.43.84.237 ingress-controller-test.apps.ci.centos.org ```

Visited http://ingress-controller-test.apps.ci.centos.org and was greeted with the expected content in the deployed app.
We should be able to achieve this spike CPE-764 using the Ingress Controller Operator.