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title | description | date | tags | |
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How to increase /dev/shm size on kubernetes | the equivalent to docker's shm-size flag | 2024-10-02 |
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Introduction
Today I had to find a way to increase the size of the shared memory filesystem offered to containers for a specific workload. /dev/shm
is a Linux specific tmpfs
filesystem that some applications use for inter process communications. The defaults size of this filesystem on kubernetes nodes is 64MiB.
Docker has a --shm-size 1g
flag to specify that. Though kubernetes does not offer a direct equivalent, we can replicate this with volumes.
Configuration in pod specification
Here are the relevant sections of the spec we need to set:
spec:
template:
spec:
container:
volume_mount:
mount_path = "/dev/shm"
name = "dev-shm"
read_only = false
volume:
empty_dir:
medium = "Memory"
size_limit = "1Gi"
name = "dev-shm"
Conclusion
Well it works!