ahmadiq/stakater-reloader-comparison.csv

## stakater-reloader-comparison.csv

          
            
            ConfigMapController
            Stakater Reloader
            k8s-trigger-controller

            
              Triggering resource
              Only supports watching ConfigMaps
              Can watch both ConfigMaps as well as Secrets for changes in configuration that may need to trigger a pod update
              Supports change detection in both ConfigMaps and Secrets

            
              Updateable resource
              Only supports updating  Deployments
              Supports updating Deployments, as well as StatefulSets and DaemonSets
              k8s-trigger-controller only supports updates to Deployments. It does not support DaemonSets or StatefulSets.

            
              Change detection
              Configmap controller uses FABRICB_FOO_REVISION environment variable to store any change in configmap controller. It does not encode it or convert it in suitable hash value which can lead to data pollution in the Deployment
              uses SHA1 to encode the changes in ConfigMap or Secret. It then saves the SHA1 value in 
STAKATER_FOO_CONFIGMAP or STAKATER_FOO_SECRET environment variable depending upon where the change has happened. The use of SHA1 provides a concise 40 characters encoded value that is not prone to collision.
              k8s-trigger-controller stores the SHA-1 hash value in an annotation `trigger.k8s.io/[secret|configMap]-NAME-last-hash`.
The hash value is added within the name of the annotation which makes it cumbersome to read.

            
              Code stability
              Currently there are no unit test cases or end to end integration test cases. This can add difficulties for any additional updates in ConfigMapController or testing compatibility against future versions of Kubernetes.
              Reloader codebase has both unit test cases and end to end integration test cases. This is a huge advantage when extending or customizing the controller. One can make sure that new changes do not break any old functionality.
              Has end to end as well as unit test cases.
	ConfigMapController	Stakater Reloader	k8s-trigger-controller
Triggering resource	Only supports watching ConfigMaps	Can watch both ConfigMaps as well as Secrets for changes in configuration that may need to trigger a pod update	Supports change detection in both ConfigMaps and Secrets
Updateable resource	Only supports updating Deployments	Supports updating Deployments, as well as StatefulSets and DaemonSets	k8s-trigger-controller only supports updates to Deployments. It does not support DaemonSets or StatefulSets.
Change detection	Configmap controller uses FABRICB_FOO_REVISION environment variable to store any change in configmap controller. It does not encode it or convert it in suitable hash value which can lead to data pollution in the Deployment	uses SHA1 to encode the changes in ConfigMap or Secret. It then saves the SHA1 value in STAKATER_FOO_CONFIGMAP or STAKATER_FOO_SECRET environment variable depending upon where the change has happened. The use of SHA1 provides a concise 40 characters encoded value that is not prone to collision.	k8s-trigger-controller stores the SHA-1 hash value in an annotation `trigger.k8s.io/[secret\|configMap]-NAME-last-hash`. The hash value is added within the name of the annotation which makes it cumbersome to read.
Code stability	Currently there are no unit test cases or end to end integration test cases. This can add difficulties for any additional updates in ConfigMapController or testing compatibility against future versions of Kubernetes.	Reloader codebase has both unit test cases and end to end integration test cases. This is a huge advantage when extending or customizing the controller. One can make sure that new changes do not break any old functionality.	Has end to end as well as unit test cases.