From 5e4ac94692ab76f6cb9c4ddaa0b64da36dee5644 Mon Sep 17 00:00:00 2001
From: Julien Dessaux
Date: Wed, 2 Oct 2024 10:36:59 +0200
Subject: add /dev/shm on kubernetes blog article

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 content/blog/kubernetes/dev-shm.md | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 content/blog/kubernetes/dev-shm.md

(limited to 'content/blog/kubernetes/dev-shm.md')

diff --git a/content/blog/kubernetes/dev-shm.md b/content/blog/kubernetes/dev-shm.md
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@@ -0,0 +1,36 @@
+---
+title: 'How to increase /dev/shm size on kubernetes'
+description: "the equivalent to docker's shm-size flag"
+date: '2024-10-02'
+tags:
+- kubernetes
+---
+
+## 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:
+``` yaml
+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!
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