Docker
Docker rootless mode failed to start because unprivileged user namespaces are disabled
[rootlesskit:parent] error: failed to start the child: fork/exec /proc/self/exe: operation not permitted
Rootless Docker could not start because the kernel setting for unprivileged user namespace creation is disabled.
Observed message
[rootlesskit:parent] error: failed to start the child: fork/exec /proc/self/exe: operation not permitted
Why it happens
- The system has /proc/sys/kernel/unprivileged_userns_clone set to 0.
- The host kernel configuration blocks unprivileged user namespace creation.
How to fix it
- Set kernel.unprivileged_userns_clone=1 in sysctl configuration.
- Apply the sysctl settings and retry the rootless Docker startup.
