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Fix systemd unit dropping the runtime environment (TLS off, no TURN) #55

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Merged
sashyo merged 1 commit into from
Aug 13, 2026
Merged

Fix systemd unit dropping the runtime environment (TLS off, no TURN) #55

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15 changes: 15 additions & 0 deletions signal-server-rs/deploy.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -180,6 +180,21 @@ fi
UNIT_SRC="$(dirname "$0")/pkg/signal-server-rs.service"
if command -v systemctl >/dev/null 2>&1 && [ -f "$UNIT_SRC" ]; then
echo "[Deploy] Installing systemd unit..."

# systemd does not inherit this script's exports, so everything computed
# above has to be handed over in a file. Miss this and the server comes up on
# plain HTTP with no TURN.
RUNTIME_ENV=/etc/signal-server-rs.env
{
echo "PORT=${SIGNAL_PORT}"
echo "RELAY_PORT=${RELAY_PORT}"
echo "ICE_SERVERS=stun:${EXTERNAL_IP}:3478"
echo "TURN_SERVER=turn:${EXTERNAL_IP}:3478"
echo "RELAY_HOST=${DOMAIN:-${EXTERNAL_IP}}"
[ -n "$TLS_CERT" ] && echo "TLS_CERT_PATH=${TLS_CERT}"
[ -n "$TLS_KEY" ] && echo "TLS_KEY_PATH=${TLS_KEY}"
} | sudo tee "$RUNTIME_ENV" >/dev/null
sudo chmod 600 "$RUNTIME_ENV"
sudo cp "$UNIT_SRC" /etc/systemd/system/signal-server-rs.service
sudo systemctl daemon-reload
sudo systemctl enable signal-server-rs >/dev/null 2>&1 || true
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21 changes: 12 additions & 9 deletions signal-server-rs/pkg/signal-server-rs.service
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Expand Up @@ -4,25 +4,29 @@ Documentation=https://github.com/sashyo/keylessh/blob/main/docs/SIGNAL-SERVER.md
# coturn runs as a container and the server reads TURN settings at startup.
After=network-online.target docker.service
Wants=network-online.target
# Keep retrying indefinitely — a signal server that stays down is worse than
# one that keeps trying, and its absence shows up as a permissions error.
StartLimitIntervalSec=0

[Service]
Type=simple
User=azureuser
# Secrets live in the env file, so it is read by systemd rather than being
# baked into this unit. Root-owned and unreadable by the service user is fine —
# systemd reads it before dropping privileges.
# Runs as root, as the previous nohup deployment did: the TLS material it reads
# lives under /root/certs.
User=root

# Two files, and both are needed. The first holds the long-lived secrets. The
# second is written by deploy.sh and carries everything it computes at run time
# — TLS paths, ICE/TURN, relay host. Without it the server starts on plain HTTP
# with no TURN, and every wss:// client fails.
EnvironmentFile=/home/azureuser/keylessh/signal-server/.env
Environment=PORT=9090
EnvironmentFile=/etc/signal-server-rs.env
ExecStart=/home/azureuser/keylessh/signal-server-rs/target/release/signal-server-rs

# The whole point of this unit: a bare nohup process died on every reboot and
# nothing brought it back, which surfaced in the console as "contact your
# administrator to get server access".
Restart=always
RestartSec=5
# Do not give up after repeated quick failures — a signal server that stays
# down is worse than one that keeps retrying.
StartLimitIntervalSec=0

StandardOutput=journal
StandardError=journal
Expand All @@ -33,7 +37,6 @@ SyslogIdentifier=signal-server-rs
NoNewPrivileges=yes
PrivateTmp=yes
ProtectSystem=full
ProtectHome=read-only
ReadWritePaths=/tmp

[Install]
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