podman/docs/source/markdown/options/isolation.md

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####> This option file is used in: ####> podman build, farm build ####> If file is edited, make sure the changes ####> are applicable to all of those.

--isolation=type

Controls what type of isolation is used for running processes as part of RUN instructions. Recognized types include oci (OCI-compatible runtime, the default), rootless (OCI-compatible runtime invoked using a modified configuration and its --rootless option enabled, with --no-new-keyring --no-pivot added to its create invocation, with network and UTS namespaces disabled, and IPC, PID, and user namespaces enabled; the default for unprivileged users), and chroot (an internal wrapper that leans more toward chroot(1) than container technology).

Note: You can also override the default isolation type by setting the BUILDAH_ISOLATION environment variable. export BUILDAH_ISOLATION=oci