Building Unity Headless Docker Image

✍ Last Updated : September 19, 2022

🚪 Prequisite Knowledge (Optional)

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Unity Project Build Process

[Containerization / Docker](Containerization Docker 2e0ce73ff63b419d9e2782d79c4cc440.md)

[Build Docker Image for Minikube](Build Docker Image for Minikube e00be467a95f48deaa1a2c87088468eb.md)

❓ Key Question / Problem / Issue

How to build

✅ Expected Output/Definition of Done

Define what information you really need and the definition of done

Clear guideline on how to create Unity Headless Docker Image

🎁 Resulting Solution

Write writing results below

Build Headless Docker Image

Kubernetes uses a Docker image to run your headless build, to create your image we already created a directory called SampleHeadless inside the project to help you build your image.

❗ When building the headless, the build name should be **linuxBuild**, if you wanted to use another name you need to change the name inside **/SampleHeadless/entrypoint.sh** for example, if you wanted to name the build **gameServer**

cd /root/build/
chmod +x **gameServer**.x86_64
./**gameServer**.x86_64

now copy your build files into /SampleHeadless/build-files

the directory should look more or less like this:

SampleHeadless
- build-files
  - linuxBuild_Data
  - .gitkeep
  - linuxBuild.x86_64
  - UnityPlayer.so

open another terminal or command prompt and cd to the SampleHeadless directory

run

& minikube -p agones docker-env | Invoke-Expression
docker build -t unity-headless .

result

Sending build context to Docker daemon  69.81MB
Step 1/7 : FROM ubuntu:bionic
 ---> 8d5df41c547b
Step 2/7 : ARG DEBIAN_FRONTEND=noninteractive
 ---> Running in 2ab7180ebd21
Removing intermediate container 2ab7180ebd21
 ---> 53883ce1e344
Step 3/7 : ARG DOCKER_VERSION=17.06.0-ce
 ---> Running in 7622e125d38c
Removing intermediate container 7622e125d38c
 ---> 1cc2f345bc69
Step 4/7 : COPY build-files/            /root/build/
 ---> e49fac17d54d
Step 5/7 : COPY entrypoint.sh           /entrypoint.sh
 ---> 9bdc5106fb27
Step 6/7 : WORKDIR /root/
 ---> Running in 92467f9a5571
Removing intermediate container 92467f9a5571
 ---> 8f878d9857ac
Step 7/7 : ENTRYPOINT ["/bin/bash", "/entrypoint.sh"]
 ---> Running in 29620b2561e9
Removing intermediate container 29620b2561e9
 ---> 49faf80e3f64
Successfully built 49faf80e3f64
Successfully tagged unity-headless:latest
SECURITY WARNING: You are building a Docker image from Windows against a non-Windows Docker host. 
All files and directories added to build context will have '-rwxr-xr-x' permissions. It is recommended to double check and reset permissions for sensitive files and directories.

Use 'docker scan' to run Snyk tests against images to find vulnerabilities and learn how to fix them

to check your image, on the same terminal

run

docker image ls

result

unity-headless                             latest     49faf80e3f64   15 minutes ago   133MB
gcr.io/agones-images/agones-allocator      1.25.0     90209bbb8134   13 days ago      66.3MB      
gcr.io/agones-images/agones-sdk            1.25.0     07d53a7b8dae   13 days ago      63.7MB      
gcr.io/agones-images/agones-ping           1.25.0     7c30bcd998d0   13 days ago      20.5MB      
gcr.io/agones-images/agones-controller     1.25.0     f9f714de0e2e   13 days ago      67MB        
ubuntu                                     bionic     8d5df41c547b   2 weeks ago      63.1MB      
k8s.gcr.io/kube-apiserver                  v1.22.12   d922296a8b85   4 weeks ago      128MB       
k8s.gcr.io/kube-controller-manager         v1.22.12   f5ef4d6e36ee   4 weeks ago      122MB       
k8s.gcr.io/kube-proxy                      v1.22.12   761817698b62   4 weeks ago      104MB       
k8s.gcr.io/kube-scheduler                  v1.22.12   5ee90014579c   4 weeks ago      52.7MB      
k8s.gcr.io/metrics-server/metrics-server   <none>     e57a417f15d3   6 months ago     68.8MB      
k8s.gcr.io/etcd                            3.5.0-0    004811815584   14 months ago    295MB       
k8s.gcr.io/coredns/coredns                 v1.8.4     8d147537fb7d   14 months ago    47.6MB      
gcr.io/k8s-minikube/storage-provisioner    v5         6e38f40d628d   16 months ago    31.5MB      
k8s.gcr.io/pause                           3.5        ed210e3e4a5b   17 months ago    683kB

the unity-headless image should be listed there

Docker Run

docker run —name=test-unity-headless test-headless

Testing Port is opened & received

netstat -tulpn