Starting screen session as a service, how do I transmit the screen session output (back) to the service log?

birgersp

12/16/22, 1:07 PM

I have an application that is a interactive shell. I want this application to run as a service. To be able to access the shell while the service is running, I figured its best to start the service as a screen session that launches the application.

But this creates a problem. The service log doesn't actually show any of the output that I can see in the screen session.

How can I transmit the screen session output to the service log?

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

[Service]
Type=forking
WorkingDirectory=/home/birger/csgo-server
ExecStartPre=-/usr/bin/screen -S ${SCREEN_TITLE} -X kill
ExecStart=/usr/bin/screen -dmS ${SCREEN_TITLE} -O -l /usr/bin/bash\
 -c /home/birger/csgo-server/update-and-start
ExecStop=/usr/bin/screen -S ${SCREEN_TITLE} -p 0 -X stuff "exit^M"
Environment=SCREEN_TITLE=csgo
RemainAfterExit=false
Restart=always
RestartSec=5s
SuccessExitStatus=1

[Install]
WantedBy=default.target

Started by

systemctl --user start csgo.service

Viewing logs by

journalctl -u csgo.service

Output (is blank):

-- Logs begin at Sat 2020-02-22 14:17:45 CET, end at Mon 2021-08-16 15:06:35 CEST. --
-- No entries --

But if I attach to the screen I can see that there is actually loads of text, just not displayed in the service log.

0 + 2

gnu-screen

systemd

anx

12/31/22, 6:13 PM

Why are you even doing this? srcds has the `rcon` and `steamcmd_script` features specifically so you do *not* have to pull unreliable tricks like running it in a screen session. Just run the srcds executable directly in ExecStart and enjoy having its output properly forwarded to journal!

birgersp

12/31/22, 6:21 PM

You got a point. And I guess generally speaking, there is no way to "transmit" the output from screen to the journal?

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: Starting screen session as a service, how do I transmit the screen session output (back) to the service log?

TH: เริ่มต้นเซสชันหน้าจอเป็นบริการ ฉันจะส่งเอาต์พุตเซสชันหน้าจอ (ย้อนกลับ) ไปยังบันทึกการบริการได้อย่างไร

RO: Începând sesiunea de ecran ca serviciu, cum transmit rezultatul sesiunii de ecran (înapoi) în jurnalul de service?

RU: Запуск сеанса экрана в качестве службы, как мне передать вывод сеанса экрана (обратно) в журнал службы?

VI: Bắt đầu phiên màn hình dưới dạng dịch vụ, làm cách nào để truyền đầu ra phiên màn hình (quay lại) vào nhật ký dịch vụ?

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