sumcoin-seeder

Sumcoin-seeder is a crawler for the Sumcoin network, which exposes a list of reliable nodes via a built-in DNS server.

Features:

• regularly revisits known nodes to check their availability

• bans nodes after enough failures, or bad behavior

• accepts nodes down to v0.5.0 to request new IP addresses from, but only reports good post-v0.6.9 nodes.

• keeps statistics over (exponential) windows of 2 hours, 8 hours,

  1 day and 1 week, to base decisions on.

• very low memory (a few tens of megabytes) and cpu requirements.

• crawlers run in parallel (by default 96 threads simultaneously).

Open Port (53)

ufw allow 53
ufw allow 53/tcp

Install the dependencies

sudo apt-get install build-essential libboost-all-dev libssl-dev

Clone the project

First, you'll need a droplet with a domain assigned to it. Once that is set up, you can start on the actual seeder.

First, go into the digital ocean panel (or whichever service you use) for the domain. Add a new NS record, making the hostname something like "dnsseed" and directed to the IP of the droplet. Once that's done, log into the droplet as root. Download the seeder with ...

git clone https://github.com/sumcoinlabs/sumcoin-seeder.git

USAGE

---

Assuming you want to run a dns seed on dnsseed.example.com, you will need an authorative NS record in example.com's domain record, pointing to for example vps.example.com:

dig -t NS dnsseed.EXAMPLE.com

;; ANSWER SECTION dnsseed.EXAMPLE.com. 86400 IN NS vps.EXAMPLE.com.

If you want the DNS server to report SOA records, please provide an e-mail address (with the @ part replaced by .) using -m.

• ALSO, See TMUX Section Below

COMPILING

Go into the seeder directory and run "make".

cd sumcoin-seeder

Compiling will require boost and ssl. On debian systems, these are provided by libboost-dev and libssl-dev respectively.

From the dir - "sumcoin-seeder" run:

make

• This will produce the dnsseed binary.

• It should compile pretty quickly.

Create TMUX Session

When it's done, start a tmux session called "seeder". ** STAY in the dir "sumcoin-seeder"

tmux new -s seeder

Now enter the TMUX Session

tmux a -t seeder

Start the dnsseeder with the following:

./dnsseed -h dnsseed.domain.com -n vps.domain.com -m emailaddress.domainname.com --wipeignore

Make sure it running

From command line:...

nslookup dnsseed.EXAMPLE.com

RUNNING AS NON-ROOT

Typically, you'll need root privileges to listen to port 53 (name service).

One solution is using an iptables rule (Linux only) to redirect it to a non-privileged port:

$ iptables -t nat -A PREROUTING -p udp --dport 53 -j REDIRECT --to-port 5353

If properly configured, this will allow you to run dnsseed in userspace, using the -p 5353 option.