ps aux | grep synergy-client

nano ~/.config/systemd/user/synergy-session.service

[Unit]Description=Synergy Client (User Session)After=graphical-session.target network.target[Service]ExecStart=/usr/bin/synergy-client -f --no-tray --debug INFO --enable-crypto --name YOUR_CLIENT_NAME --sync-language YOUR_SERVER_IP:24800Restart=on-failure[Install]WantedBy=default.target

systemctl --user daemon-re...

Product: Synergy 1.17.0 and above Operating System: Linux

How to run Synergy automatically after login - create a user-level systemd service

1. Open the terminal
2. Run the following command to find and copy the core launch command:

ps aux | grep synergy-client

nano ~/.config/systemd/user/synergy-session.service

1. Copy and paste in the following script:

[Unit]Description=Synergy Client (User Session)After=graphical-session.target network.target[Service]ExecStart=/usr/bin/synergy-client -f --no-tray --debug INFO --enable-crypto --name YOUR_CLIENT_NAME --sync-language YOUR_SERVER_IP:24800Restart=on-failure[Install]WantedBy=default.target

Press Ctrl+O to save, and Ctrl+X to close nano

Now enable the service:

systemctl --user daemon-reexec

systemctl --user daemon-reload

systemctl --user enable synergy-session

Note - remove the –enable-crypto and –sync-language if you don’t have those settings enabled.

To run Synergy at the login screen on a Linux client

Step 1: Identify Synergy Client Settings

On your working Synergy client session (after login), run:

ps aux | grep synergy-client

Take note of the command flags, an example:

/usr/bin/synergy-client -f --no-tray --debug INFO --name linuxubuntu22 --sync-language 192.168.86.82:24800

You’ll use this exact command in the login wrapper script.

Step 2: Create the Wrapper Script

sudo nano /usr/local/bin/synergy-login.sh

Copy and paste the following script(adjust IP and hostname):

#!/bin/bashLOGFILE="/var/log/synergy-login.log"echo "[$(date)] Starting synergy-login.sh" >> "$LOGFILE"export DISPLAY=:0export XAUTHORITY="/run/user/$(id -u gdm)/gdm/Xauthority"# Wait for X session to be readywhile [ ! -f "$XAUTHORITY" ]; doecho "[$(date)] Waiting for XAUTHORITY..." >> "$LOGFILE"sleep 1donesleep 2echo "[$(date)] XAUTHORITY found, launching synergy-client" >> "$LOGFILE"while true; do/usr/bin/synergy-client -f --no-tray --debug INFO --enable-crypto \--name YOUR_CLIENT_NAME --sync-language YOUR_SERVER_IP:24800 >> "$LOGFILE" 2>&1echo "[$(date)] synergy-client exited. Retrying in 5s..." >> "$LOGFILE"sleep 5done

Replace YOUR_CLIENT_NAME and YOUR_SERVER_IP with your actual values.

Make it executable:

sudo chmod +x /usr/local/bin/synergy-login.sh

(Optional) Step 3: Configure Trusted Server Fingerprint for TLS

1. Get the trusted fingerprint (on the client after accepting the server):

cat ~/.synergy/SSL/Fingerprints/TrustedServers.txt

Example:

YOUR_SERVER_IP:24800 sha256:ABCDEF123456...

2. Make this accessible to root (for login screen use):

sudo mkdir -p /root/.synergy/SSL/Fingerprintssudo ln -s /home/YOUR_USERNAME/.synergy/SSL/Fingerprints/TrustedServers.txt \/root/.synergy/SSL/Fingerprints/TrustedServers.txtsudo chmod o+r /home/YOUR_USERNAME/.synergy/SSL/Fingerprints/TrustedServers.txt

Replace YOUR_USERNAME with your actual Linux username.

Step 4: Create systemd Service

sudo nano /etc/systemd/system/synergy.service

Copy and paste the following script:

[Unit]Description=Synergy Client at Login ScreenAfter=gdm.service network-online.targetWants=network-online.target[Service]ExecStart=/usr/local/bin/synergy-login.shUser=rootRestart=alwaysRestartSec=5[Install]WantedBy=graphical.target

Enable and start the service:

sudo systemctl daemon-reloadsudo systemctl enable synergysudo systemctl restart synergy

Step 5: Reboot and Test

Reboot to test:

sudo reboot

After reboot:

1. Wait at login screen
2. Switch to TTY (Ctrl + Alt + F3)
3. Log in
4. Check the log:

sudo tail -n 30 /var/log/synergy-login.log

You should see:

[INFO] crypto enabled[INFO] connected to server