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It's crucial to have an effective access management system that allows you to robustly manage user identities and permissions across your clusters. Although Kubernetes includes an advanced RBAC implementation, this only works within a single cluster. A dedicated Kubernetes management platform such as Rancher or Portainer is required to cohesively configure identities and grant users the multi-cluster access they require.
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Going multicloud and multi-cluster can make it harder to maintain continual oversight of your security posture. Different clouds and cluster distributions may have their own security defaults and policy engines, so you need a mechanism that permits you to centrally roll out new configurations and compliance controls. Standardizing on a well-supported policy model such as Open Policy Agent (OPA) will make it easier to apply consistent settings to all your environments.
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Connecting your clusters to an external monitoring solution such as Prometheus allows you to aggregate insights from across multiple clouds, exposing the bigger picture. This can help uncover opportunities to further optimize your architecture without making you manually collate data from each cloud service.
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Istio: Istio is one of the leading Kubernetes service mesh solutions. You can use Istio to set up multi-cluster networking, allowing workloads in one cluster to interact with those in other clusters. This gives you more flexibility in where and how you deploy your apps.
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If you do require custom tooling, then the Kubernetes Cluster API can help orchestrate your operations. It allows you to manage the lifecycle of Kubernetes clusters and associated infrastructure across multiple cloud providers and infrastructure platforms, including AWS, Azure, Google Cloud, IBM, and more. The Cluster API gives you a single interface for deploying clusters with consistent configuration to all the clouds you use, minimizing time spent connecting provider-specific APIs.
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Distributed storage solutions such as Ceph and Portworx allow you to reliably scale multi-cloud storage access. These systems unify interactions with cloud provider object and block storage interfaces, enabling cross-cloud data transfers with integrated high availability and disaster recovery functions.