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fix: let local sandboxes work on Docker Desktop #417

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Merged
HomelessDinosaur merged 1 commit into from
Oct 16, 2026
Merged

fix: let local sandboxes work on Docker Desktop #417

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14 changes: 9 additions & 5 deletions compose.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -67,6 +67,11 @@ configs:
host = "0.0.0.0"
port = 8090
api_key = "${OPENSANDBOX_API_KEY:-development-opensandbox-key}"
# The host in the sandbox addresses this server returns, which the API
# on this machine connects to. Docker publishes sandboxes' ports on every
# interface, loopback included, and Docker Desktop forwards them to this
# machine's loopback.
eip = "127.0.0.1"

[runtime]
type = "docker"
Expand All @@ -78,11 +83,10 @@ configs:

[docker]
network_mode = "bridge"
# Sandboxes' ports are published on Docker's bridge address, which this
# container can reach and nothing outside the machine can. 172.17.0.1 is
# Docker's default on Linux.
host_ip = "${OPENSANDBOX_HOST_IP:-172.17.0.1}"
publish_host = "${OPENSANDBOX_HOST_IP:-172.17.0.1}"
# How this container reaches sandboxes' published ports, to proxy to them
# and check they are up. The opensandbox service's extra_hosts entry
# resolves this name on Docker Engine and Docker Desktop alike.
host_ip = "host.docker.internal"
# Below Linux's ephemeral ports (32768 and up), which outgoing
# connections take, so a sandbox's port is never already in use.
port_range_min = 20000
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