dostrelith678/Cardano-stuff

Useful commands

Delete logs older than 1 day

find /opt/cardano/cnode/logs/archive/ -mtime +1 -name "*.json" -print -exec /bin/rm {} \;

Epoch Nonce

cardano-cli query protocol-state --mainnet | jq -r .csTickn.ticknStateEpochNonce.contents

Block multiple connections to the node from the same IP Address (possible attacks)

Edit the ufw before.rules file:

sudo nano /etc/ufw/before.rules

Add the following:

# Block too many connections to node from the same IP
-A ufw-before-input -p tcp -m tcp -m connlimit --connlimit-above 3 --connlimit-mask 32 --connlimit-saddr  --dport <NODE_PORT> -j DROP

Reload the ufw to apply:

sudo ufw reload

Latest config

https://hydra.iohk.io/job/Cardano/cardano-node/cardano-deployment/latest-finished/download/1/index.html

ZFS

apt update
apt install dpkg-dev linux-headers-generic linux-image-generic
apt install zfs-dkms zfsutils-linux
mkdir /opt/cardano
chown koios:koios /opt/cardano
dd if=/dev/zero of=/opt/cardano/disk.000 bs=1M count=409600 # adjust as required
zpool create koiosdisk /opt/cardano/disk.000
zfs set mountpoint=/opt/cardano/cnode koiosdisk
zfs set compression=lz4 koiosdisk