Applications Deployment

Templates

Applications can be deployed by using templates
To get what are the resources that will be created with the template:
- oc process -f mysql-template.yaml -o yaml
Parameters can be used to customise the deployment of templates. To list all the parameters available in a template:
- oc process -f mysql-template.yaml --parameters
To create a deployment based off a template:
- oc new-app --template mysql-template
To create a deployment based off a template with parameter:
- oc new-app --template mysql-template --params MYSQL_USER=admin

Declarative deployment of applications
- oc create -f my-app-deployment.yaml
- oc new-app --file=./my-app-deployment.yaml

oc set env deployment/my-db MYSQL_USERNAME=mysql MYSQL_DATABASE=sampledb

Source can be a git repository
During source to image deployment, a golden image (the image which the source will be building upon), and context directory need to be defined
Deployment with git source
- oc new-app --name=hello https://github.com/xxx -i php:7.4-ubi8 --context-dir php-helloworld
A new BuildConfig will be created to build the image. A Build resource will be created for the actual building of image. A pod will also be created for the building.
Once the image build is completed, it will be pushed to a ImageStream