DOC: initial draft for docker/openshift

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

docker/README.md

+<table style="border-collapse: collapse; border: none;">
+  <tr style="border-collapse: collapse; border: none;">
+    <td style="border-collapse: collapse; border: none;">
+      <a href="http://www.openairinterface.org/">
+         <img src="../doc/images/oai_final_logo.png" alt="" border=3 height=50 width=150>
+         </img>
+      </a>
+    </td>
+    <td style="border-collapse: collapse; border: none; vertical-align: center;">
+      <b><font size = "5">OAI Docker/Podman Build and Usage Procedures</font></b>
+    </td>
+  </tr>
+</table>
+
 ---
 
 to be done
 
 ---
+
+# 1. Build Strategy #
+
+For all platforms, the strategy for building docker/podman images is the same:
+
+*  First we create a common shared image that contains:
+   -  the latest source files (by using the `COPY` function)
+   -  all the means to build an OAI RAN executable
+      *  all packages, compilers, ...
+      *  especially UHD is installed 
+*  Then from this shared image (`ran-build`) we can build target images for:
+   -  eNB
+   -  gNB
+   -  lte-UE
+   -  nr-UE
+*  These target images will only contain:
+   -  the generated executable (for example `lte-softmodem.Rel15`)
+   -  the generated shared libraries (for example `liboai_usrpdevif.so.Rel15`)
+   -  the needed libraries and packages to run these generated binaries
+   -  Some configuration file templates
+   -  Some tools (such as `ping`, `ifconfig`)
+
+TO DO:
+
+-  Proper entrypoints
+-  Proper port exposure
+-  ...
+
+# 2. File organization #
+
+Dockerfiles are named with the following naming convention: `Dockerfile.${target}.${OS-version}.${cluster-version}`
+
+Targets can be:
+
+-  `ran` for an image named `ran-build` (the shared image)
+-  `eNB` for an image named `oai-enb`
+-  `gNB` for an image named `oai-gnb`
+-  `lteUE` for an image named `oai-lte-ue`
+-  `nrUE` for an image named `oai-nr-ue`
+
+The currently-supported OS are:
+
+- `rhel8.2` for Red Hat Entreprise Linux
+- `ubuntu18` for Ubuntu 18.04 LTS
+
+The currently-supported cluster version is:
+
+- `rhel8.2.oc4-4`
+
+We have also `rhel7.oc4-4` support but it will be discontinued soon.
+
+For more details in build within a Openshift Cluster, see [OpenShift README](../openshift/README.md) for more details.
+
+# 3. Building using `docker` under Ubuntu 18.04 #
+
+## 3.1. Pre-requisites ##
+
+* `git` installed
+* `docker-ce` installed
+* Pulling `ubuntu:bionic` from DockerHub
+
+## 3.2. Building the shared image ##
+
+This can be done starting `2020.w41` tag on the `develop` branch, or any branch that includes that tag.
+
+```bash
+git clone https://gitlab.eurecom.fr/oai/openairinterface5g.git
+cd openairinterface5g
+git checkout develop
+```
+
+In our Eurecom/OSA environment we need to pass a GIT proxy.
+
+```bash
+docker build --target ran-build --tag ran-build:latest --file docker/Dockerfile.ran.ubuntu18 --build-arg NEEDED_GIT_PROXY="http://proxy.eurecom.fr:8080" .
+```
+
+if you don't need it, do NOT pass any value:
+
+```bash
+docker build --target ran-build --tag ran-build:latest --file docker/Dockerfile.ran.ubuntu18 .
+```
+
+After a while:
+
+```bash
+docker image ls
+REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
+ran-build           latest              ccb721bc0b57        1 minute ago        4.06GB
+...
+```
+
+## 3.3. Building any target image ##
+
+For example, the eNB:
+
+```bash
+docker build --target oai-enb --tag oai-enb:latest --file docker/Dockerfile.eNB.ubuntu18 .
+```
+
+After a while:
+
+```
+docker image ls
+REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
+oai-enb             latest              25ddbd8b7187        1 minute ago        516MB
+<none>              <none>              875ea3b05b60        8 minutes ago       8.18GB
+ran-build           latest              ccb721bc0b57        1 hour ago          4.06GB
+```
+
+Do not forget to remove the temporary image:
+
+```
+docker image prune --force
+```
+
+# 4. Building using `podman` under Red Hat Entreprise Linux 8.2 #
+
+TODO.
+
+# 5. Running modems using `docker` under Ubuntu 18.04 #
+
+TODO.
+
+# 6. Running modems using `podman` under Red Hat Entreprise Linux 8.2 #
+
+TODO.

openshift/README.md

+<table style="border-collapse: collapse; border: none;">
+  <tr style="border-collapse: collapse; border: none;">
+    <td style="border-collapse: collapse; border: none;">
+      <a href="http://www.openairinterface.org/">
+         <img src="../doc/images/oai_final_logo.png" alt="" border=3 height=50 width=150>
+         </img>
+      </a>
+    </td>
+    <td style="border-collapse: collapse; border: none; vertical-align: center;">
+      <b><font size = "5">OpenShift Build and Usage Procedures</font></b>
+    </td>
+  </tr>
+</table>
+
+TO BE DONE.