In today's show we will talk about installing synergy so that you can

control the keyboard and mouse of another computer securely over

ssh.

Install synergy on both computers as root

# dnf install synergy

# apt install synergy

The main pc is pc_middle and it is the one with the

keyboard and mouse we intend to use for all the computers.

The only other pc in this configuration is, one on the right which we

call pc_right

On pc_middle create a configuration file. I put it in

~/etc/synergy-work.conf

section: screens

pc_middle:

pc_right:

end

section: links

pc_middle:

right = pc_right

pc_right:

left = pc_middle

end

On pc_middle add entry to ~/.ssh/config to

allow portforwarding back, for the synergy port

24800

Host pc_right

Hostname 192.168.0.150

RemoteForward 127.0.0.1:24800 127.0.0.1:24800 # send back from the client to me

On pc_middle run synergy server in the foreground with

debug enabled

[user@pc_middle ~]$ synergys --debug DEBUG --no-daemon --server --address 127.0.0.1 --config ~/etc/synergy-work.conf --name pc_middle --log /tmp/synergy-work.conf.log

[2022-12-03T16:29:05] DEBUG: opening configuration "~/etc/synergy-work.conf"

[2022-12-03T16:29:05] DEBUG: configuration read successfully

[2022-12-03T16:29:05] DEBUG: XOpenDisplay(":0")

[2022-12-03T16:29:05] DEBUG: xscreensaver window: 0x00c00001

[2022-12-03T16:29:05] DEBUG: screen shape: 0,0 5760x2160 (xinerama)

[2022-12-03T16:29:05] DEBUG: window is 0x05e00004

[2022-12-03T16:29:05] DEBUG: adopting new buffer

[2022-12-03T16:29:05] DEBUG: opened display

[2022-12-03T16:29:05] WARNING: LANGUAGE_DEBUG Poll result 0

[2022-12-03T16:29:05] DEBUG: registered hotkey ScrollLock (id=ef14 mask=0000) as id=1

[2022-12-03T16:29:05] NOTE: started server, waiting for clients

[2022-12-03T16:29:05] DEBUG: event queue is ready

[2022-12-03T16:29:05] DEBUG: add pending events to buffer

[2022-12-03T16:29:05] DEBUG: screen "pc_middle" shape changed

On pc_middle you can check that it's running

[user@pc_middle ~]$ netstat -anp | grep 24800

tcp 0 0 127.0.0.1:24800 0.0.0.0:* LISTEN 90859/synergys

On pc_middle you can connect to

pc_right

[user@pc_middle ~]$ ssh pc_right

user@pc_right:~$

On pc_right (either on its own keyboard, or via ssh

session from pc_middle), check that port 24800

is listening

user@pc_right:~$ netstat -anp | grep 24800

tcp 0 0 127.0.0.1:24800 0.0.0.0:* LISTEN

On the other keyboard that is connected to the pc_right

(see note below †)

user@pc_right:~$ synergyc --debug INFO --no-daemon --name pc_right 127.0.0.1

[2022-12-03T16:38:59] NOTE: started client

/build/synergy-3N7yN5/synergy-1.8.8-stable+dfsg.1/src/lib/synergy/ClientApp.cpp,404

[2022-12-03T16:38:59] NOTE: connecting to '127.0.0.1': 127.0.0.1:24800

/build/synergy-3N7yN5/synergy-1.8.8-stable+dfsg.1/src/lib/client/Client.cpp,146

[2022-12-03T16:38:59] NOTE: connected to server

/build/synergy-3N7yN5/synergy-1.8.8-stable+dfsg.1/src/lib/synergy/ClientApp.cpp,294

Back on pc_middle, you should see the the log that you

have connected

[2022-12-03T16:40:15] DEBUG: Opening new socket: 18FC73A0

[2022-12-03T16:40:15] NOTE: accepted client connection

[2022-12-03T16:40:16] DEBUG: received client "pc_right" info shape=0,0 5760x2160 at 2787,1371

[2022-12-03T16:40:16] NOTE: client "pc_right" has connected

† Note: If you tried to run the client syne