From fbaaec53327a6afff24036c01e8c273945897225 Mon Sep 17 00:00:00 2001
From: vsoch <vsoch@users.noreply.github.com>
Date: Wed, 25 Jun 2025 21:18:49 -0600
Subject: [PATCH] bug: multi-node setup needs unique network names

In the case of using Podman (or a runtime that has a shared CNI
directory in the user home) and the case that the runtime
generates a cni file for each node network, if you have a
shared filesystem and a single, non-unique name, each node
will write a slightly different address in the CNI file
and clobber any previously written files (race condition).
This additional make multi-node command will replace
"default network" to be specific to the hostname and
avoid this.

Signed-off-by: vsoch <vsoch@users.noreply.github.com>
---
 README.md           | 3 +++
 docker-compose.yaml | 4 ++--
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index db1eccce..48f265ed 100644
--- a/README.md
+++ b/README.md
@@ -103,8 +103,11 @@ pasta does not seem to work well
 Use scripts in [`./init-host`](./init-host) for automating these steps.
 
 ## Usage
+
 See `make help`.
 
+Here are instructions for control plane and worker nodes.
+
 ```bash
 # Bootstrap a cluster
 make up
diff --git a/docker-compose.yaml b/docker-compose.yaml
index 09707ea4..5c13c5b6 100644
--- a/docker-compose.yaml
+++ b/docker-compose.yaml
@@ -8,7 +8,7 @@ services:
     privileged: true
     restart: always
     networks:
-      default:
+      ${HOSTNAME}:
         ipv4_address: ${NODE_IP}
     ports:
       # <host>:<container>
@@ -46,7 +46,7 @@ services:
       "nerdctl/bypass4netns-ignore-bind": "true"
       "nerdctl/bypass4netns-ignore-subnets": "${BYPASS4NETNS_IGNORE_SUBNETS:-}"
 networks:
-  default:
+  ${HOSTNAME}:
     ipam:
       config:
         # Each of the nodes has to have a different IP.