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Could not load the Qt platform plugin "xcb" in "" even though it was found

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  • J Offline
    J Offline
    jaaf
    wrote on last edited by
    #1

    Hi,
    I have a PyQt6 application that uses sqlachemy to connect to a MariaDB server. This app runs correctly under Fedora 38.
    I want to dockerize this app but I am new to docker and don't yet master it thus be indulgent for my mistakes.

    To be as close as possible to my development context I started with a Fedora 38 image on which I installed python3 and the required dependencies.

    Here is my Dockerfile for the app

    FROM fedora:38
ENV DISPLAY=:0
COPY . .
RUN dnf -y upgrade 
RUN dnf -y install python3 python3-pip
RUN python3 -m pip install -r dependencies.txt
RUN dnf install -y mesa-libGLU libxkbcommon mesa-libEGL fontconfig dbus-libs xauth
CMD [ "python3", "main.py" ]

    The dependencies comes from my developement virtual env after I ran the following command

    pip freeze > dependencies.txt

    attrs==23.1.0
    blivet==3.7.1
    greenlet==3.0.0a1
    jsonpickle==3.0.1
    jsonschema==4.17.3
    PyMySQL==1.1.0
    PyQt5-sip==12.12.1
    PyQt6==6.5.1
    PyQt6-Qt6==6.5.1
    PyQt6-sip==13.5.1
    pyrsistent==0.19.3
    pyudev==0.24.1
    six==1.16.0
    SQLAlchemy==1.4.46
    SQLAlchemy-Utils==0.39.0
    typing_extensions==4.7.0rc1

    and my docker-compose.yml

    version: "3"
services:
    db:
        container_name: mydb2
        image: mariadb:latest
        ports:
            - "32001:3306"
        environment:
            MYSQL_ROOT_PASSWORD: root
    app:
        container_name: biere
        links:
            - "db"
        build: ./
        environment:
            - DISPLAY=${DISPLAY}
        volumes:
            - /tmp/.X11-unix:/tmp/.X11-unix
        ports:
            - "5001:5000"

    connection to the database is provided in this file

    from sqlalchemy import create_engine
from sqlalchemy_utils import create_database, database_exists
from sqlalchemy.orm import sessionmaker, scoped_session
from database.orm_base import Base
db_url="mysql+pymysql://root:root@mydb2:3306/a_db"
if not database_exists(db_url):
    create_database(db_url)
engine = create_engine(db_url,pool_size=5,pool_recycle=3600)
Session =sessionmaker(bind=engine,expire_on_commit=False)
session =Session()

    Then what happens

    There is no problem signaled with the build command

    sudo docker-compose build

    but the command

    sudo docker-compose up

    returns this message

    Starting mydb2 ... done
    Starting biere ... done
    Attaching to mydb2, biere
    mydb2 | 2023-06-30 09:31:05+00:00 [Note] [Entrypoint]: Entrypoint script for MariaDB Server 1:11.0.2+maria~ubu2204 started.
    mydb2 | 2023-06-30 09:31:05+00:00 [Note] [Entrypoint]: Switching to dedicated user 'mysql'
    mydb2 | 2023-06-30 09:31:05+00:00 [Note] [Entrypoint]: Entrypoint script for MariaDB Server 1:11.0.2+maria~ubu2204 started.
    mydb2 | 2023-06-30 09:31:06+00:00 [Note] [Entrypoint]: MariaDB upgrade not required
    mydb2 | 2023-06-30 9:31:06 0 [Note] Starting MariaDB 11.0.2-MariaDB-1:11.0.2+maria~ubu2204 source revision 0005f2f06c8e1aea4915887decad67885108a929 as process 1
    mydb2 | 2023-06-30 9:31:06 0 [Note] InnoDB: Compressed tables use zlib 1.2.11
    mydb2 | 2023-06-30 9:31:06 0 [Note] InnoDB: Number of transaction pools: 1
    mydb2 | 2023-06-30 9:31:06 0 [Note] InnoDB: Using crc32 + pclmulqdq instructions
    mydb2 | 2023-06-30 9:31:06 0 [Note] mariadbd: O_TMPFILE is not supported on /tmp (disabling future attempts)
    mydb2 | 2023-06-30 9:31:06 0 [Note] InnoDB: Using liburing
    mydb2 | 2023-06-30 9:31:06 0 [Note] InnoDB: Initializing buffer pool, total size = 128.000MiB, chunk size = 2.000MiB
    mydb2 | 2023-06-30 9:31:06 0 [Note] InnoDB: Completed initialization of buffer pool
    mydb2 | 2023-06-30 9:31:06 0 [Note] InnoDB: File system buffers for log disabled (block size=512 bytes)
    mydb2 | 2023-06-30 9:31:06 0 [Note] InnoDB: Opened 3 undo tablespaces
    mydb2 | 2023-06-30 9:31:06 0 [Note] InnoDB: 128 rollback segments in 3 undo tablespaces are active.
    mydb2 | 2023-06-30 9:31:06 0 [Note] InnoDB: Setting file './ibtmp1' size to 12.000MiB. Physically writing the file full; Please wait ...
    mydb2 | 2023-06-30 9:31:06 0 [Note] InnoDB: File './ibtmp1' size is now 12.000MiB.
    mydb2 | 2023-06-30 9:31:06 0 [Note] InnoDB: log sequence number 47641; transaction id 16
    mydb2 | 2023-06-30 9:31:06 0 [Note] Plugin 'FEEDBACK' is disabled.
    mydb2 | 2023-06-30 9:31:06 0 [Note] Plugin 'wsrep-provider' is disabled.
    mydb2 | 2023-06-30 9:31:06 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
    mydb2 | 2023-06-30 9:31:06 0 [Note] InnoDB: Buffer pool(s) load completed at 230630 9:31:06
    mydb2 | 2023-06-30 9:31:06 0 [Note] Server socket created on IP: '0.0.0.0'.
    mydb2 | 2023-06-30 9:31:06 0 [Note] Server socket created on IP: '::'.
    mydb2 | 2023-06-30 9:31:06 0 [Note] mariadbd: ready for connections.
    mydb2 | Version: '11.0.2-MariaDB-1:11.0.2+maria~ubu2204' socket: '/run/mysqld/mysqld.sock' port: 3306 mariadb.org binary distribution
    biere | qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.
    biere | This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.
    biere |
    biere | Available platform plugins are: vnc, minimal, wayland, minimalegl, linuxfb, offscreen, wayland-egl, vkkhrdisplay, xcb, eglfs.
    biere |
    mydb2 | 2023-06-30 9:31:08 5 [Warning] Aborted connection 5 to db: 'a_db' user: 'root' host: '172.19.0.3' (Got an error reading communication packets)
    biere exited with code 139

    How to fix this?

    JonBJ 1 Reply Last reply
    0
  • JonBJ Offline
    JonBJ Offline
    JonB
    replied to jaaf on last edited by
    #2

    @jaaf said in Could not load the Qt platform plugin "xcb" in "" even though it was found:

    qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.

    The usual way to debug this is to set environment variable QT_DEBUG_PLUGINS to 1 and then run your program/script. It should produce diagnostic output for the failure.

    1 Reply Last reply
    0
  • J Offline
    J Offline
    jaaf
    wrote on last edited by
    #3

    Thank you for caring about my problem
    I added

    • QT_DEBUG_PLUGINS=1
      in the docker-compose environment for the app
      Here is the part of the message I get now.

    qt.core.plugin.factoryloader: Got keys from plugin meta data QList("eglfs")
    biere | qt.core.plugin.factoryloader: checking directory path "/usr/bin/platforms" ...
    biere | qt.core.library: "/usr/local/lib64/python3.11/site-packages/PyQt6/Qt6/plugins/platforms/libqxcb.so" cannot load: Cannot load library /usr/local/lib64/python3.11/site-packages/PyQt6/Qt6/plugins/platforms/libqxcb.so: (libxkbcommon-x11.so.0: cannot open shared object file: No such file or directory)
    biere | qt.core.plugin.loader: QLibraryPrivate::loadPlugin failed on "/usr/local/lib64/python3.11/site-packages/PyQt6/Qt6/plugins/platforms/libqxcb.so" : "Cannot load library /usr/local/lib64/python3.11/site-packages/PyQt6/Qt6/plugins/platforms/libqxcb.so: (libxkbcommon-x11.so.0: cannot open shared object file: No such file or directory)"
    biere | qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.
    biere | This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.
    It seems that libqxcb.so is missing but I didn't find how to get it.
    In the container I installed PyQt6 and PyQt6-Qt6 with pip

    JonBJ 1 Reply Last reply
    0
  • JonBJ Offline
    JonBJ Offline
    JonB
    replied to jaaf on last edited by JonB
    #4

    @jaaf said in Could not load the Qt platform plugin "xcb" in "" even though it was found:

    It seems that libqxcb.so is missing but I didn't find how to get it.

    biere | qt.core.plugin.loader: QLibraryPrivate::loadPlugin failed on "/usr/local/lib64/python3.11/site-packages/PyQt6/Qt6/plugins/platforms/libqxcb.so" : "Cannot load library /usr/local/lib64/python3.11/site-packages/PyQt6/Qt6/plugins/platforms/libqxcb.so: (libxkbcommon-x11.so.0: cannot open shared object file: No such file or directory)"

    Well, no, the message tells you that file was found but it has a dependent file libxkbcommon-x11.so.0 and that does not exist. If you wish to verify this you can run ldd /usr/local/lib64/python3.11/site-packages/PyQt6/Qt6/plugins/platforms/libqxcb.so and you should find it will tell you that (along with any other missing dependencies).

    One normally installs these in the system area via apt. I don't know whether you need to do the same or whether this is supposed to be in the supplied PyQt6 plugins directory. Note that it is an X11 package file, that may make a difference to how you are supposed to get it, maybe supplied PyQt6 stuff never includes such.

    1 Reply Last reply
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  • J Offline
    J Offline
    jaaf
    wrote on last edited by
    #5

    OK, thanks. My mistake!
    My last docker-compose is now this one

    version: "3"
volumes:
    data:
services:
    db:
        container_name: mydb2
        image: mariadb:latest
        ports:
            - "32001:3306"
        environment:
            MYSQL_ROOT_PASSWORD: root
            MYSQL_USER: root
        volumes:
            - data:/var/lib/mysql
    app:
        container_name: biere
        links:
            - "db"
        build: ./
        environment:
            - DISPLAY=${DISPLAY}
            - QT_DEBUG_PLUGINS=1
        volumes:
            - /tmp/.X11-unix:/tmp/.X11-unix
        ports:
            - "5001:5000"

    It seems that there is no longer errors but nothing shows up on the screen.
    Here is the output of the docker-compose run command

    (venvbase) [jaaf@fedora project]$ sudo docker-compose up -d
    [sudo] Mot de passe de jaaf :
    Creating network "project_default" with the default driver
    Creating volume "project_data" with default driver
    Pulling db (mariadb:latest)...
    latest: Pulling from library/mariadb
    3f94e4e483ea: Pull complete
    302c1621580e: Pull complete
    e9ebb34cbdd0: Pull complete
    58c98f01d4c3: Pull complete
    a41d8a26ca52: Pull complete
    24b0629eb07f: Pull complete
    cec8c791723c: Pull complete
    a6992c60d007: Pull complete
    Digest: sha256:c9520bf76a3cdad4779d65bae4c6c46278283a7212511d99a06c90480d42efb4
    Status: Downloaded newer image for mariadb:latest
    Creating mydb2 ... done
    Creating biere ... done
    (venvbase) [jaaf@fedora project]$

    What is missing ?

    1 Reply Last reply
    0
  • J Offline
    J Offline
    jaaf
    wrote on last edited by jaaf
    #6

    when I run the command without -d

    [jaaf@fedora project]$ docker-compose up
    Creating network "project_default" with the default driver
    Creating mydb2 ... done
    Creating biere ... done
    Attaching to mydb2, biere
    mydb2 | 2023-06-30 14:59:51+00:00 [Note] [Entrypoint]: Entrypoint script for MariaDB Server 1:11.0.2+maria~ubu2204 started.
    mydb2 | 2023-06-30 14:59:52+00:00 [Note] [Entrypoint]: Switching to dedicated user 'mysql'
    mydb2 | 2023-06-30 14:59:52+00:00 [Note] [Entrypoint]: Entrypoint script for MariaDB Server 1:11.0.2+maria~ubu2204 started.
    mydb2 | 2023-06-30 14:59:52+00:00 [Note] [Entrypoint]: MariaDB upgrade not required
    mydb2 | 2023-06-30 14:59:52 0 [Note] Starting MariaDB 11.0.2-MariaDB-1:11.0.2+maria~ubu2204 source revision 0005f2f06c8e1aea4915887decad67885108a929 as process 1
    mydb2 | 2023-06-30 14:59:52 0 [Note] InnoDB: Compressed tables use zlib 1.2.11
    mydb2 | 2023-06-30 14:59:52 0 [Note] InnoDB: Number of transaction pools: 1
    mydb2 | 2023-06-30 14:59:52 0 [Note] InnoDB: Using crc32 + pclmulqdq instructions
    mydb2 | 2023-06-30 14:59:52 0 [Note] mariadbd: O_TMPFILE is not supported on /tmp (disabling future attempts)
    mydb2 | 2023-06-30 14:59:52 0 [Note] InnoDB: Using liburing
    mydb2 | 2023-06-30 14:59:52 0 [Note] InnoDB: Initializing buffer pool, total size = 128.000MiB, chunk size = 2.000MiB
    mydb2 | 2023-06-30 14:59:52 0 [Note] InnoDB: Completed initialization of buffer pool
    mydb2 | 2023-06-30 14:59:52 0 [Note] InnoDB: File system buffers for log disabled (block size=512 bytes)
    mydb2 | 2023-06-30 14:59:52 0 [Note] InnoDB: Opened 3 undo tablespaces
    mydb2 | 2023-06-30 14:59:52 0 [Note] InnoDB: 128 rollback segments in 3 undo tablespaces are active.
    mydb2 | 2023-06-30 14:59:52 0 [Note] InnoDB: Setting file './ibtmp1' size to 12.000MiB. Physically writing the file full; Please wait ...
    mydb2 | 2023-06-30 14:59:52 0 [Note] InnoDB: File './ibtmp1' size is now 12.000MiB.
    mydb2 | 2023-06-30 14:59:52 0 [Note] InnoDB: log sequence number 146494; transaction id 92
    mydb2 | 2023-06-30 14:59:52 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
    mydb2 | 2023-06-30 14:59:52 0 [Note] Plugin 'FEEDBACK' is disabled.
    mydb2 | 2023-06-30 14:59:52 0 [Note] Plugin 'wsrep-provider' is disabled.
    mydb2 | 2023-06-30 14:59:52 0 [Note] Server socket created on IP: '0.0.0.0'.
    mydb2 | 2023-06-30 14:59:52 0 [Note] Server socket created on IP: '::'.
    mydb2 | 2023-06-30 14:59:52 0 [Note] InnoDB: Buffer pool(s) load completed at 230630 14:59:52
    mydb2 | 2023-06-30 14:59:52 0 [Note] mariadbd: ready for connections.
    mydb2 | Version: '11.0.2-MariaDB-1:11.0.2+maria~ubu2204' socket: '/run/mysqld/mysqld.sock' port: 3306 mariadb.org binary distribution
    biere | qt.core.plugin.factoryloader: checking directory path "/usr/local/lib64/python3.11/site-packages/PyQt6/Qt6/plugins/platforms" ...
    biere | qt.core.plugin.factoryloader: looking at "/usr/local/lib64/python3.11/site-packages/PyQt6/Qt6/plugins/platforms/libqvnc.so"
    biere | qt.core.plugin.loader: Found metadata in lib /usr/local/lib64/python3.11/site-packages/PyQt6/Qt6/plugins/platforms/libqvnc.so, metadata=
    biere | {
    biere | "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    biere | "MetaData": {
    biere | "Keys": [
    biere | "vnc"
    biere | ]
    biere | },
    biere | "archlevel": 1,
    biere | "className": "QVncIntegrationPlugin",
    biere | "debug": false,
    biere | "version": 394496
    biere | }
    biere |
    biere |
    biere | qt.core.plugin.factoryloader: Got keys from plugin meta data QList("vnc")
    biere | qt.core.plugin.factoryloader: looking at "/usr/local/lib64/python3.11/site-packages/PyQt6/Qt6/plugins/platforms/libqminimal.so"
    biere | qt.core.plugin.loader: Found metadata in lib /usr/local/lib64/python3.11/site-packages/PyQt6/Qt6/plugins/platforms/libqminimal.so, metadata=
    biere | {
    biere | "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    biere | "MetaData": {
    biere | "Keys": [
    biere | "minimal"
    biere | ]
    biere | },
    biere | "archlevel": 1,
    biere | "className": "QMinimalIntegrationPlugin",
    biere | "debug": false,
    biere | "version": 394496
    biere | }
    biere |
    biere |
    biere | qt.core.plugin.factoryloader: Got keys from plugin meta data QList("minimal")
    biere | qt.core.plugin.factoryloader: looking at "/usr/local/lib64/python3.11/site-packages/PyQt6/Qt6/plugins/platforms/libqwayland-generic.so"
    biere | qt.core.plugin.loader: Found metadata in lib /usr/local/lib64/python3.11/site-packages/PyQt6/Qt6/plugins/platforms/libqwayland-generic.so, metadata=
    biere | {
    biere | "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    biere | "MetaData": {
    biere | "Keys": [
    biere | "wayland"
    biere | ]
    biere | },
    biere | "archlevel": 1,
    biere | "className": "QWaylandIntegrationPlugin",
    biere | "debug": false,
    biere | "version": 394496
    biere | }
    biere |
    biere |
    biere | qt.core.plugin.factoryloader: Got keys from plugin meta data QList("wayland")
    biere | qt.core.plugin.factoryloader: looking at "/usr/local/lib64/python3.11/site-packages/PyQt6/Qt6/plugins/platforms/libqminimalegl.so"
    biere | qt.core.plugin.loader: Found metadata in lib /usr/local/lib64/python3.11/site-packages/PyQt6/Qt6/plugins/platforms/libqminimalegl.so, metadata=
    biere | {
    biere | "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    biere | "MetaData": {
    biere | "Keys": [
    biere | "minimalegl"
    biere | ]
    biere | },
    biere | "archlevel": 1,
    biere | "className": "QMinimalEglIntegrationPlugin",
    biere | "debug": false,
    biere | "version": 394496
    biere | }
    biere |
    biere |
    biere | qt.core.plugin.factoryloader: Got keys from plugin meta data QList("minimalegl")
    biere | qt.core.plugin.factoryloader: looking at "/usr/local/lib64/python3.11/site-packages/PyQt6/Qt6/plugins/platforms/libqlinuxfb.so"
    biere | qt.core.plugin.loader: Found metadata in lib /usr/local/lib64/python3.11/site-packages/PyQt6/Qt6/plugins/platforms/libqlinuxfb.so, metadata=
    biere | {
    biere | "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    biere | "MetaData": {
    biere | "Keys": [
    biere | "linuxfb"
    biere | ]
    biere | },
    biere | "archlevel": 1,
    biere | "className": "QLinuxFbIntegrationPlugin",
    biere | "debug": false,
    biere | "version": 394496
    biere | }
    biere |
    biere |
    biere | qt.core.plugin.factoryloader: Got keys from plugin meta data QList("linuxfb")
    biere | qt.core.plugin.factoryloader: looking at "/usr/local/lib64/python3.11/site-packages/PyQt6/Qt6/plugins/platforms/libqoffscreen.so"
    biere | qt.core.plugin.loader: Found metadata in lib /usr/local/lib64/python3.11/site-packages/PyQt6/Qt6/plugins/platforms/libqoffscreen.so, metadata=
    biere | {
    biere | "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    biere | "MetaData": {
    biere | "Keys": [
    biere | "offscreen"
    biere | ]
    biere | },
    biere | "archlevel": 1,
    biere | "className": "QOffscreenIntegrationPlugin",
    biere | "debug": false,
    biere | "version": 394496
    biere | }
    biere |
    biere |
    biere | qt.core.plugin.factoryloader: Got keys from plugin meta data QList("offscreen")
    biere | qt.core.plugin.factoryloader: looking at "/usr/local/lib64/python3.11/site-packages/PyQt6/Qt6/plugins/platforms/libqwayland-egl.so"
    biere | qt.core.plugin.loader: Found metadata in lib /usr/local/lib64/python3.11/site-packages/PyQt6/Qt6/plugins/platforms/libqwayland-egl.so, metadata=
    biere | {
    biere | "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    biere | "MetaData": {
    biere | "Keys": [
    biere | "wayland-egl"
    biere | ]
    biere | },
    biere | "archlevel": 1,
    biere | "className": "QWaylandEglPlatformIntegrationPlugin",
    biere | "debug": false,
    biere | "version": 394496
    biere | }
    biere |
    biere |
    biere | qt.core.plugin.factoryloader: Got keys from plugin meta data QList("wayland-egl")
    biere | qt.core.plugin.factoryloader: looking at "/usr/local/lib64/python3.11/site-packages/PyQt6/Qt6/plugins/platforms/libqvkkhrdisplay.so"
    biere | qt.core.plugin.loader: Found metadata in lib /usr/local/lib64/python3.11/site-packages/PyQt6/Qt6/plugins/platforms/libqvkkhrdisplay.so, metadata=
    biere | {
    biere | "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    biere | "MetaData": {
    biere | "Keys": [
    biere | "vkkhrdisplay"
    biere | ]
    biere | },
    biere | "archlevel": 1,
    biere | "className": "QVkKhrDisplayIntegrationPlugin",
    biere | "debug": false,
    biere | "version": 394496
    biere | }
    biere |
    biere |
    biere | qt.core.plugin.factoryloader: Got keys from plugin meta data QList("vkkhrdisplay")
    biere | qt.core.plugin.factoryloader: looking at "/usr/local/lib64/python3.11/site-packages/PyQt6/Qt6/plugins/platforms/libqxcb.so"
    biere | qt.core.plugin.loader: Found metadata in lib /usr/local/lib64/python3.11/site-packages/PyQt6/Qt6/plugins/platforms/libqxcb.so, metadata=
    biere | {
    biere | "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    biere | "MetaData": {
    biere | "Keys": [
    biere | "xcb"
    biere | ]
    biere | },
    biere | "archlevel": 1,
    biere | "className": "QXcbIntegrationPlugin",
    biere | "debug": false,
    biere | "version": 394496
    biere | }
    biere |
    biere |
    biere | qt.core.plugin.factoryloader: Got keys from plugin meta data QList("xcb")
    biere | qt.core.plugin.factoryloader: looking at "/usr/local/lib64/python3.11/site-packages/PyQt6/Qt6/plugins/platforms/libqeglfs.so"
    biere | qt.core.plugin.loader: Found metadata in lib /usr/local/lib64/python3.11/site-packages/PyQt6/Qt6/plugins/platforms/libqeglfs.so, metadata=
    biere | {
    biere | "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    biere | "MetaData": {
    biere | "Keys": [
    biere | "eglfs"
    biere | ]
    biere | },
    biere | "archlevel": 1,
    biere | "className": "QEglFSIntegrationPlugin",
    biere | "debug": false,
    biere | "version": 394496
    biere | }
    biere |
    biere |
    biere | qt.core.plugin.factoryloader: Got keys from plugin meta data QList("eglfs")
    biere | qt.core.plugin.factoryloader: checking directory path "/usr/bin/platforms" ...
    biere | qt.core.library: "/usr/local/lib64/python3.11/site-packages/PyQt6/Qt6/plugins/platforms/libqxcb.so" loaded library
    biere | Authorization required, but no authorization protocol specified
    biere | qt.qpa.xcb: could not connect to display :0
    biere | qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.
    biere | This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.
    biere |
    biere | Available platform plugins are: vnc, minimal, wayland, minimalegl, linuxfb, offscreen, wayland-egl, vkkhrdisplay, xcb, eglfs.
    biere |
    mydb2 | 2023-06-30 14:59:53 4 [Warning] Aborted connection 4 to db: 'a_db' user: 'root' host: '192.168.32.3' (Got an error reading communication packets)
    biere exited with code 139

    I don't clearly understand the sentence
    Authorization required, but no authorization protocol specified
    biere | qt.qpa.xcb: could not connect to display :0

    What shoul I do? . For information, my system run X11, not wayland.

    SGaistS 1 Reply Last reply
    0
  • SGaistS Offline
    SGaistS Offline
    SGaist Lifetime Qt Champion
    replied to jaaf on last edited by
    #7

    @jaaf hi,

    The user in your docker container is root which by default has no access to the X server for security reasons. You can use the xhost command to manipulate these permissions.

    Interested in AI ? www.idiap.ch
    Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

    1 Reply Last reply
    1

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