java17 image: knockd requires GLIBC_2.34, causing autopause to fail

[xandreiAThome]

Describe the problem

The latest itzg/minecraft-server:java17 image appears to ship a knockd binary that requires GLIBC_2.34, while the image itself is based on Ubuntu 20.04 (glibc 2.31). As a result, autopause fails to start.

Container definition

services: 
    minecraft: 
        image: itzg/minecraft-server:java17 
        environment: 
            EULA: "TRUE" 
            TYPE: FABRIC 
            VERSION: "1.20.1" 
            ENABLE_AUTOPAUSE: "true"

Container logs

[init] Autopause functionality enabled
[init] Updated server port in knockd config
/usr/local/sbin/knockd: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.34' not found (required by /usr/local/sbin/knockd)
[Autopause loop] Failed to start knockd daemon.
[Autopause loop] Probable cause: Unable to attach to interface "eth0".
[Autopause loop] Available interfaces within the docker container:
[Autopause loop]   eth0
[Autopause loop] Please set the environment variable AUTOPAUSE_KNOCK_INTERFACE to the interface that handles incoming connections.
[Autopause loop] If unsure which interface to choose, run the ifconfig command in the container.
[Autopause loop] Autopause failed to initialize. This log entry will be printed every 30 minutes.

[itzg]

Thanks for reporting this.