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https://github.com/tam7t/droplan
Manage iptable rules for the private interface on DigitalOcean droplets
https://github.com/tam7t/droplan
digitalocean iptables
Last synced: 20 days ago
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Manage iptable rules for the private interface on DigitalOcean droplets
- Host: GitHub
- URL: https://github.com/tam7t/droplan
- Owner: tam7t
- License: mit
- Created: 2016-01-22T00:19:45.000Z (almost 9 years ago)
- Default Branch: master
- Last Pushed: 2017-06-10T02:32:23.000Z (over 7 years ago)
- Last Synced: 2024-11-10T00:33:13.073Z (about 1 month ago)
- Topics: digitalocean, iptables
- Language: Go
- Homepage:
- Size: 182 KB
- Stars: 69
- Watchers: 4
- Forks: 12
- Open Issues: 4
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
- awesome-digitalocean - droplan - Manage iptable rules for the private interface on DigitalOcean droplets. (Community OSS projects)
README
# droplan [](https://travis-ci.org/tam7t/droplan) [](https://gitter.im/tam7t/droplan)
## DigitalOcean Firewalls!
Exciting news! DigitalOcean now has a native firewall option that integrates well with tagging. Please consider using that instead of `droplan`!
https://blog.digitalocean.com/cloud-firewalls-secure-droplets-by-default/
## About
This utility helps secure the network interfaces on DigitalOcean droplets by
adding `iptable` rules that only allow traffic from your other droplets. `droplan`
queries the DigitalOcean API and automatically updates `iptable` rules.
## Installation
The latest release is available on the github [release page](https://github.com/tam7t/droplan/releases).
You can setup a cron job to run every 5 minutes in `/etc/cron.d`
```
*/5 * * * * root PATH=/sbin DO_KEY=READONLY_KEY /usr/local/bin/droplan >/var/log/droplan.log 2>&1
```
## Usage
```
DO_KEY= /path/to/droplan
```
The `iptables` rules added by `droplan` are equivalent to:
```
-N droplan-peers # create a new chain
-A INPUT -i eth1 -j droplan-peers # add chain to private interface
-A INPUT -i eth1 -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
-A INPUT -i eth1 -j DROP # add default DROP rule to private interface
-A droplan-peers -s /32 -j ACCEPT # allow traffic from PEER ip address
```
### Tags
Access can be limited to a subset of droplets using [tags](https://developers.digitalocean.com/documentation/v2/#tags).
The `DO_TAG` environment variable tells `droplan` to only allow access to
droplets with the specified tag.
### Public Interface
Add the `PUBLIC=true` environment variable and `droplan` will maintain an
iptables chain of `droplan-peers-public` with the public ip addresses of
peers and add a default drop rule to the `eth0` interface.
**NOTE:** This will prevent you from being able to directly ssh into your droplet.
## Development
### Dependencies
Dependencies are vendored with [govendor](https://github.com/kardianos/govendor).
### Build
A `Makefile` is included:
* `test` - runs unit tests
* `build` - builds `droplan` on the current platform
* `release` - builds releasable artifacts
## Docker image:
We provide a prebuilt [docker image][1]
Example usage:
```sh
docker run -d --restart=always --net=host --cap-add=NET_ADMIN -e DO_KEY=$your_digitalocean_api_key -e DO_INTERVAL=300 tam7t/droplan
```
- `-d --restart=always` starts the container in the background and restarts it on error (and on reboot)
- `--net=host` is required because we want to affect the host's firewall rules, not the container's
- `--cap-add=NET_ADMIN` to allow changing the host's firewall rules
- specify `-e DO_INTERVAL=300` to change the delay (in seconds) between droplan invocations (default: execute once and exit)
- you have to specify your DigitalOcean API key (using `-e DO_KEY`)
- you can add `-e PUBLIC=true` or `-e DO_TAG=tagname` as described above
- To manually start droplan (i.e. skip the 5 minute delay between invocations), simply use `docker restart $container-name`
[1]: https://hub.docker.com/r/tam7t/droplan/