How to set time from inside container

Technical Support
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8

Hi @Kacper !

There might be a way to help you. Please try the following.

  1. Download the default seccomp file from Docker:
wget https://raw.githubusercontent.com/moby/moby/master/profiles/seccomp/default.json -O /etc/docker/seccomp/time.json
  1. Edit the file to add the clock_settime64 syscall to it.
...
"names": [
    "settimeofday",
    "stime",
    "clock_settime",
    "clock_settime64"
],
"action": "SCMP_ACT_ALLOW",
...
  1. Start the container with this seccomp file, and the SYS_TIME capability.
$ docker run -it --cap-add=SYS_TIME --security-opt seccomp=/etc/docker/seccomp/time.json torizon/debian:2-bullseye
root@ddce364a7c52:/# date +%T -s "11:23:00"
11:23:00
root@ddce364a7c52:/# date

Those steps might help you to set the time from within a container without the need to deal with:

  • systemd,
  • root user, or
  • privileged container

Let me know if it works for you.

Best regards,