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Chapter 24. Shared Memory
24.1. Overview Copia collegamentoCollegamento copiato negli appunti!
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There are two types of shared memory objects in Linux: System V and POSIX. The containers in a pod share the IPC namespace of the pod infrastructure container and so are able to share the System V shared memory objects. This document describes how they can also share POSIX shared memory objects.
24.2. POSIX Shared Memory Copia collegamentoCollegamento copiato negli appunti!
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POSIX shared memory requires that a tmpfs be mounted at /dev/shm. The containers in a pod do not share their mount namespaces so we use volumes to provide the same /dev/shm into each container in a pod. The following example shows how to set up POSIX shared memory between two containers.
shared-memory.yaml
--- apiVersion: v1 id: hello-openshift kind: Pod metadata: name: hello-openshift labels: name: hello-openshift spec: volumes: - name: dshm emptyDir: medium: Memory containers: - image: kubernetes/pause name: hello-container1 ports: - containerPort: 8080 hostPort: 6061 volumeMounts: - mountPath: /dev/shm name: dshm - image: kubernetes/pause name: hello-container2 ports: - containerPort: 8081 hostPort: 6062 volumeMounts: - mountPath: /dev/shm name: dshm
---
apiVersion: v1
id: hello-openshift
kind: Pod
metadata:
name: hello-openshift
labels:
name: hello-openshift
spec:
volumes:
- name: dshm
emptyDir:
medium: Memory
containers:
- image: kubernetes/pause
name: hello-container1
ports:
- containerPort: 8080
hostPort: 6061
volumeMounts:
- mountPath: /dev/shm
name: dshm
- image: kubernetes/pause
name: hello-container2
ports:
- containerPort: 8081
hostPort: 6062
volumeMounts:
- mountPath: /dev/shm
name: dshm
Create the pod using the shared-memory.yaml file:
oc create -f shared-memory.yaml
$ oc create -f shared-memory.yaml