Oh, It seems problem is user daemon from el8 used in
https://github.com/apache/guacamole-server/blob/master/src/guacd/systemd/guacd.service.in
[root@websrv2 ~]# su daemon -s /bin/bash
bash-4.4$ /sbin/guacd -b 0.0.0.0 -f -L debug
guacd[133864]: INFO: Guacamole proxy daemon (guacd) version 1.4.0
started
guacd[133864]: DEBUG: Successfully bound AF_INET socket to host
0.0.0.0, port 4822
guacd[133864]: INFO: Listening on host 0.0.0.0, port 4822
guacd[133864]: INFO: Creating new client for protocol "rdp"
guacd[133864]: INFO: Connection ID is "$af781d48-ffaa-4dde-8a28-
dc8903395387"
guacd[133867]: WARNING: FreeRDP initialization may fail: The current
user's home directory ("/sbin") is not writable, but FreeRDP generally
requires a writable home directory for storage of configuration files
and certificates.
guacd[133867]: DEBUG: Processing instruction: size
guacd[133867]: DEBUG: Processing instruction: audio
guacd[133867]: DEBUG: Processing instruction: video
guacd[133867]: DEBUG: Processing instruction: image
guacd[133867]: DEBUG: Processing instruction: timezone
guacd[133867]: DEBUG: Parameter "console" omitted. Using default
value of 0.
guacd[133867]: DEBUG: Parameter "console-audio" omitted. Using
default value of 0.
guacd[133867]: DEBUG: Parameter "disable-auth" omitted. Using default
value of 0.
guacd[133867]: INFO: No security mode specified. Defaulting to
security mode negotiation with server.
guacd[133867]: DEBUG: User resolution is 1200x1817 at 96 DPI
guacd[133867]: DEBUG: Parameter "dpi" omitted. Using default value of
96.
guacd[133867]: DEBUG: Using resolution of 1200x1817 at 96 DPI
guacd[133867]: DEBUG: Parameter "force-lossless" omitted. Using
default value of 0.
guacd[133867]: DEBUG: Parameter "read-only" omitted. Using default
value of 0.
guacd[133867]: DEBUG: Parameter "client-name" omitted. Using default
value of "Guacamole RDP".
guacd[133867]: DEBUG: Parameter "enable-wallpaper" omitted. Using
default value of 0.
guacd[133867]: DEBUG: Parameter "enable-theming" omitted. Using
default value of 0.
guacd[133867]: DEBUG: Parameter "enable-font-smoothing" omitted.
Using default value of 0.
guacd[133867]: DEBUG: Parameter "enable-full-window-drag" omitted.
Using default value of 0.
guacd[133867]: DEBUG: Parameter "enable-desktop-composition" omitted.
Using default value of 0.
guacd[133867]: DEBUG: Parameter "enable-menu-animations" omitted.
Using default value of 0.
guacd[133867]: DEBUG: Parameter "disable-bitmap-caching" omitted.
Using default value of 0.
......
bash-4.4$ cat /etc/passwd | grep daemon
daemon:x:2:2:daemon:/sbin:/sbin/nologin
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