Diagnostic code

ZBX-E0101

can't create a user namespace

Kind

error

Blame

environment

Exit code

2

What it means

zbx runs containers without root, and that needs user namespaces. The kernel refused to create one for this user, or a setting forbids it.

Common causes: user.max_user_namespaces is 0; kernel.unprivileged_userns_clone is 0 (Debian); kernel.apparmor_restrict_unprivileged_userns is 1 (the Ubuntu 24.04 default), which blocks unconfined programs; or a security policy or a seccomp filter denies the call although the settings allow it.

The diagnostic names the cause that applies and prints the command that fixes it. If the check could not run at all (an unreadable file, a probe that timed out or was killed), the cause says so; fix that first. Then run "zbx doctor".

Offline

The same text, without a network:

zbx explain E0101