Phippy Goes to Zoo
- Refer Here for the story book
Deployments
- Refer Here for official docs
- Deployments create replica sets, replicasets create pods which in turn runs the containers
- Deployments are suitable for stateless applications
- Deployments come with two strategies
- Recreate
- RollingUpdates (Default)
- In Rolling updates
- We can rollout New versions
- undo rollout (rollbacks)
To understand Deployments
- Lets use image shaikkhajaibrahim/dmtest
- Application runs of /app on port 80
- tag 1.0
- tag 2.0
-
tag 3.0
- Lets create a Deployment with 4 replicas of version 1.0 with a service exposed to external world
- Refer Here for the manifests to deploy version 1.0
- For deployment to record the change cause lets use the annotation Refer Here
- Refer Here for changes done to add change cause
- To find the deployment status we use
kubeclt rollout - To access the application externally use nodeport or loadbalancer
- To deploy the new version change the tag and change cause annotation
- Exercise:
- Convert
- users-service from replicaset to deployment
- books-service from replicaset to deployment
- library-web-store from replicaset to deployment
- Convert
Annotations
- Refer Here for official docs
- Annotations add metadata to objects which are generally used by tools
