systemd service files for an SSH Reverse Proxy

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# Put this into /etc/systemd/system

[Unit]
Description=Keeps a tunnel to %I open
After=network-online.target

# You can also run this as a specific user, change it below
[Service]
User=root
Environment="LOCAL_ADDR=localhost"
EnvironmentFile=/etc/default/ssh-tunnel@%i
ExecStart=/usr/bin/ssh -NT -o ServerAliveInterval=15 -o ExitOnForwardFailure=yes -R ${REMOTE_ADDR}:${REMOTE_PORT}:${LOCAL_ADDR}:${LOCAL_PORT} ${TARGET}

# Restart every >2 seconds to avoid StartLimitInterval failure
RestartSec=5
Restart=always

[Install]
WantedBy=multi-user.target

ssh-tunnel@remote-example-http

# This needs to go into /etc/default
# You then enable the service with "systemd enable ssh-tunnel@remote-example-http"

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LOCAL_ADDR=localhost
LOCAL_PORT=80
REMOTE_ADDR=remote.example.host
REMOTE_PORT=64738