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So, until now, a sidecar container was just the idea of running helper containers in you Kubernetes pod that were 'helpers' for something: connection to databases or vpns, mesh networking, pulling secrets or config, debugging... But they didn't have special status, they were just regular containers in your pod.
This sometimes posed some problems because they weren't available for the full life cycle of the pod, notably on the init process. So if your init containers needed secrets, connections, networking... that was being provided via a sidecar container, you were going to have a hard time.
With this change, among other things, sidecars containers are going to be available for the whole life cycle of the pod.
There are other implications, probably, but I still haven't finished reading the KEP [0]. Check it out, and there you'll find its motivation and several interesting examples.
0: https://github.com/kubernetes/enhancements/tree/master/keps/sig-node/753-sidecar-containers
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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cloudsql-proxy
Discontinued A utility for connecting securely to your Cloud SQL instances [Moved to: https://github.com/GoogleCloudPlatform/cloud-sql-proxy]
That is very annoying. I remember having spent some time with this same issue in Google App Engine as well, which also runs Cloud SQL Proxy as a sidecar container.
https://github.com/GoogleCloudPlatform/cloudsql-proxy/issues...
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containers-roadmap
This is the public roadmap for AWS container services (ECS, ECR, Fargate, and EKS).
Deploying Fargate with CDK has to have been the most pleasant developer experience I have ever had with any product so far.
If image caching becomes a reality with Fargate I can't imagine a need to ever use anything else
https://github.com/aws/containers-roadmap/issues/696
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soci-snapshotter
A containerd snapshotter plugin which enables standard OCI images to be lazily loaded without requiring a build-time conversion step.
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