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

--tmpfs=fs

Create a tmpfs mount.

Mount a temporary filesystem (tmpfs) mount into a container, for example:

$ podman <<subcommand>> -d --tmpfs /tmp:rw,size=787448k,mode=1777 my_image

This command mounts a tmpfs at /tmp within the container. The supported mount options are the same as the Linux default mount flags. If you do not specify any options, the system uses the following options: rw,noexec,nosuid,nodev.