github.com/containers/podman/v5@v5.1.0-rc1/docs/source/markdown/options/isolation.md (about)

     1  ####> This option file is used in:
     2  ####>   podman build, farm build
     3  ####> If file is edited, make sure the changes
     4  ####> are applicable to all of those.
     5  #### **--isolation**=*type*
     6  
     7  Controls what type of isolation is used for running processes as part of `RUN`
     8  instructions.  Recognized types include *oci* (OCI-compatible runtime, the
     9  default), *rootless* (OCI-compatible runtime invoked using a modified
    10  configuration and its --rootless option enabled, with *--no-new-keyring
    11  --no-pivot* added to its *create* invocation, with network and UTS namespaces
    12  disabled, and IPC, PID, and user namespaces enabled; the default for
    13  unprivileged users), and *chroot* (an internal wrapper that leans more toward
    14  chroot(1) than container technology).
    15  
    16  Note: You can also override the default isolation type by setting the
    17  BUILDAH\_ISOLATION environment variable.  `export BUILDAH_ISOLATION=oci`