Are user namespaces secure?
User namespaces is another layer of security that isolates the host from the container. This is because even though the vulnerability allows a process in the container to have a reference to runc on the host via /proc/self/exe, the runc binary would be owned by a user ( root ) that is not mapped in the container.
What is namespace container?
Namespaces are a feature of the Linux kernel that partitions kernel resources such that one set of processes sees one set of resources while another set of processes sees a different set of resources. Namespaces are a fundamental aspect of containers on Linux.
What is namespace isolation?
Namespaces provide isolation of system resources, and cgroups allow for fine‑grained control and enforcement of limits for those resources. Containers are not the only way that you can use namespaces and cgroups.
How do Cgroups work?
Cgroups specifically deal with processes which are a fundamental piece of any operating system. A process is just a running instance of a program. When you want to run a program the Linux kernel loads the executable into memory, assigns a process ID to it, allocates various resources’ for it, and begins to run it.
What are Kubernetes namespaces useful for?
Namespaces are a way to organize clusters into virtual sub-clusters — they can be helpful when different teams or projects share a Kubernetes cluster. Any number of namespaces are supported within a cluster, each logically separated from others but with the ability to communicate with each other.
Are Linux namespaces secure?
Namespace Isolation. Namespaces are a security feature that’s built into the Linux kernel. The cool thing about them is that they allow a process to use a specific set of computer resources, which are completely segregated from the resources that another process would use.
What is a Kubernetes namespace?
Namespaces are Kubernetes objects which partition a single Kubernetes cluster into multiple virtual clusters. Each Kubernetes namespace provides the scope for Kubernetes Names it contains; which means that using the combination of an object name and a Namespace, each object gets an unique identity across the cluster.
Are Kubernetes namespaces isolated?
Kubernetes does not isolate namespaces at the cluster level. If a namespace is compromised, your cluster is compromised whatever the number of intrusion step required may be.
