mikael-lovqvists-claude-agent
2c8d1a1adb
README covers the three-part firewall setup (daemon.json, Docker network subnet, nftables) with permalinks to avoid line drift. todo.md tracks documentation still to be written. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
28 lines
1.7 KiB
Markdown
28 lines
1.7 KiB
Markdown
# Claude Code Docker Setup
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A Docker setup for running Claude Code. Note that the firewall is **not configured by just using this repo** — additional host-level setup is required to isolate the container from your LAN.
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## Firewall setup
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Firewall isolation requires three pieces working together:
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**1. Docker daemon config** — [etc_conf/daemon.json](https://gitea.efforting.tech/mikael-lovqvist/claude-docker/src/commit/94fd1de8ea3ef054ee5c45edc4988014dfbfd69c/etc_conf/daemon.json)
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Restricts the address pool Docker uses for automatic network assignment to `172.16.0.0/13`. This prevents Docker from accidentally assigning the `172.28.x.x` range used by the Claude container to other networks.
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Place at `/etc/docker/daemon.json` and restart Docker.
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**2. docker-compose.yml network** — the container is placed on `172.28.0.0/24`, which is outside the auto-assign pool above, giving it a known, stable subnet.
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**3. nftables rules** — [etc_conf/nftables.conf](https://gitea.efforting.tech/mikael-lovqvist/claude-docker/src/commit/94fd1de8ea3ef054ee5c45edc4988014dfbfd69c/etc_conf/nftables.conf)
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Drops forwarded traffic from the Docker address range (`172.16.0.0/12`, which covers `172.28.x.x`) destined for your LAN. The relevant rule is [line 31](https://gitea.efforting.tech/mikael-lovqvist/claude-docker/src/commit/94fd1de8ea3ef054ee5c45edc4988014dfbfd69c/etc_conf/nftables.conf#L31):
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```nft
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ip saddr 172.16.0.0/12 ip daddr 192.168.0.0/16 drop
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```
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**Make sure your LAN subnet is covered by the destination range here.** If your LAN uses a different range (e.g. `10.0.0.0/8`), you need to add a corresponding rule.
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Place at `/etc/nftables.conf` and enable/reload nftables.
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