Install Hermes Relayer

Setup demonstrates how to setup Hermes relayer and configure it to relay assets between LumenX and Osmosis chains.

Pre-requisites

All steps were executed and tested on:

• Ubuntu 22.04 LTS

Create user account

adduser relayer

Required packages

sudo apt install make clang pkg-config libssl-dev build-essential git jq llvm libudev-dev -y

Rust installation

curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
source $HOME/.cargo/env

NOTE: Install Rust as relayer user created earlier

Relayer build & installation

git clone https://github.com/informalsystems/ibc-rs.git && \
cd ibc-rs && \
git checkout v1.3.0 && \
cargo build --release --bin hermes

mkdir -p ${HOME}/.local/bin ; \
cp ${HOME}/ibc-rs/target/release/hermes ${HOME}/.local/bin

Hermes configuration

Create folder for Hermes configuration

mkdir -p ${HOME}/.hermes

Then populate ${HOME}/.hermes/config.toml with following content:

[[chains]]
id = 'osmosis-1'
rpc_addr = 'https://rpc.service.for.osmosis:443'
grpc_addr = 'https://grpc.service.for.osmosis:443'
websocket_addr = 'ws://rpc.service.for.osmosis:443/websocket'
rpc_timeout = '10s'
account_prefix = 'osmo'
key_name = 'osmo'
address_type = { derivation = 'cosmos' }
store_prefix = 'ibc'
default_gas = 3000000
max_gas = 10000000
gas_price = { price = 0.25, denom = 'uosmo' }
gas_adjustment = 0.1
max_msg_num = 30
max_tx_size = 180000
clock_drift = '15s'
max_block_time = '10s'
trusting_period = '14days'
memo_prefix = ''
trust_threshold = { numerator = '1', denominator = '3' }
[chains.packet_filter]
policy = 'allow'
list = [
 ['transfer', 'channel-286'], # LumenX
]


[[chains]]
id = 'LumenX'
rpc_addr = 'http://rpc.service.for.lumenx:26727'
grpc_addr = 'http://rpc.service.for.lumenx:9160'
websocket_addr = 'ws://rpc.service.for.lumenx:26727/websocket'
rpc_timeout = '10s'
account_prefix = 'lumen'
key_name = 'lumen'
address_type = { derivation = 'cosmos' }
store_prefix = 'ibc'
default_gas = 3000000
max_gas = 10000000
gas_price = { price = 0.25, denom = 'ulumen' }
gas_adjustment = 0.1
max_msg_num = 30
max_tx_size = 180000
clock_drift = '15s'
max_block_time = '10s'
trusting_period = '14days'
memo_prefix = ''
trust_threshold = { numerator = '1', denominator = '3' }
[chains.packet_filter]
policy = 'allow'
list = [
 ['transfer', 'channel-3'], # osmosis-1
]

NOTE: Please note that apropriate addresses and ports for RPC, gRPC and WebSocket services must be adjusted accordingly to point to nodes providing those services.

Add relayer keys

hermes-keys add --chain LumenX --mnemonic-file lumenx.txt
hermes-keys add --chain osmosis-1 --mnemonic-file osmosis.txt

NOTE: files lumenx.txt and osmosis.txt contain mnemonic for wallet which will be used for relayer fees. Wallets for relayer must have some amount of coins prior to starting relayer. Otherwise relayer will not be able to relay any transactions

Create and start Hermes service

Service file /etc/systemd/system/hermes.service should have at least following content:

[Unit]
Description=Hermes IBC Relayer

[Service]
User=relayer
Group=relayer
ExecStart=/home/relayer/.local/bin/hermes start
LimitNOFILE=180000
Restart=always
RestartSec=3

[Install]
WantedBy=multi-user.target

sudo systemctl daemon-reload && \
sudo systemctl enable hermes && \
sudo systemctl restart hermes