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charliecloud for Debian
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Starting with Debian 11 (Bullseye), unprivileged user namespaces are enabled by
default (see [0] for further information). Such systems do not require any kernel
configuration adjustments to use Charliecloud.
On older Debian systems, unprivileged user namespaces are disabled by default.
To enable them, run the following commands:
echo 'kernel.unprivileged_userns_clone=1' > /etc/sysctl.d/00-local-userns.conf
systemctl restart procps
[0] https://www.debian.org/releases/bullseye/amd64/release-notes/ch-information.en.html#linux-user-namespaces
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