SUGARCHAIN-SEEDER

sugarchain-seeder is a crawler for the Sugarchain 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 behaviour
• accepts nodes from Yumekawa v0.16.3.x (protocol version 70015) to request new IP addresses.
• 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).

INSTALLATION

cd && \
sudo apt-get update && \
sudo apt-get install -y build-essential libboost-all-dev libssl-dev && \
git clone https://github.com/sugarchain-project/sugarchain-seeder.git && \
cd sugarchain-seeder && \
make -j$(nproc)

REMOVE

sudo killall dnsseed ; \
cd && sudo rm -f dnsseed.dat && sudo rm -f dnsseed.dump && sudo rm -f dnsstats.log && \
cd && cd sugarchain-seeder/ && sudo rm -f dnsseed.dat && sudo rm -f dnsseed.dump && sudo rm -f dnsstats.log && \
cd && rm -rf sugarchain-seeder/ && \
sudo netstat -nulp | grep 53

USAGE

On the system 1ns.sugarchain.info, you can now run dnsseed with root privileged to use port 53 (UDP)

sudo ./dnsseed -h 1seed.sugarchain.info -n 1ns.sugarchain.info -m cryptozeny.gmail.com

Assuming you want to run a dns seed on 1seed.sugarchain.info, you will need an authorative NS record in sugarchain.org's domain record, pointing to for example 1ns.sugarchain.info. Set DNS TTL as 86400 (1 Day) or Automatic.

dig -t NS 1seed.sugarchain.info

;; ANSWER SECTION:
1seed.sugarchain.info. 21599 IN	NS	1ns.sugarchain.info.

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

Check if port 53 opened

sudo netstat -nulp | grep 53

udp6       0      0 :::53                   :::*                                10949/dnsseed

Check if it works

watch -n1 dig +short -t A 1seed.sugarchain.info @1.1.1.1

Run Sugarchain node on another computer

./src/sugarchaind -dns=1 -dnsseed=1 -forcednsseed=1 -listen=1

CRON

Adding the following command with sudo crontab -e as @reboot. On amazon AWS EC2, run with crontab -e (without sudo because the username is ubuntu)

1seed.sugarchain.info

# dnsseed for sugarchain (mainnet)
@reboot sudo $HOME/sugarchain-seeder/dnsseed -h 1seed.sugarchain.info -n 1ns.sugarchain.info -m cryptozeny.gmail.com

(Optional) Reboot frequently (1)

# reboot every week on Monday(1) 01:01
# Minute | Hour | Day | Month | Day(Week) 
1 1 * * MON sudo /sbin/shutdown -r now

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.

RESOURCE

• https://github.com/team-exor/generic-seeder/blob/master/SETUP.md