QSSH Setup

Overview

QSSH enables SSH connections over QUIC transport, providing better performance and reliability over unstable network connections compared to traditional TCP-based SSH.

Server Setup

Installation

Download the latest qssh-server binary from GitHub releases
Install on the remote node:

sudo mv qssh-server /usr/local/bin/qssh-server
sudo chmod +x /usr/local/bin/qssh-server

Configuration

Create /etc/qssh-config.toml:

[server]
quic_addr = ":4433"           # QSSH listening port
ssh_addr = "127.0.0.1:22"     # Local SSH daemon

[tls]
generate_certs = true         # Auto-generate TLS certificates
cert_file = "/etc/qssh/cert.pem"
key_file = "/etc/qssh/key.pem"

[quic]
max_idle_timeout = "30s"
max_incoming_streams = 100
keep_alive_period = "10s"

Running the Server

Manually:

qssh-server -config-file /etc/qssh-config.toml

As a systemd service (recommended):

Create /etc/systemd/system/qssh.service:

[Unit]
Description=QSSH Server
After=network.target

[Service]
ExecStart=/usr/local/bin/qssh-server -config-file /etc/qssh-config.toml
Restart=always
User=root

[Install]
WantedBy=multi-user.target

Enable and start:

sudo systemctl enable qssh
sudo systemctl start qssh

Adding QSSH Nodes in Flowctl

When adding a node in flowctl:

Set Connection Type to qssh
Set Port to 4433 (or your configured QSSH port)
Configure other fields as usual (hostname, username, credential)