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How to Limit the Size of the tmpfs File System. The size of the tmpfs file system is not limited by default. Therefore, tmpfs can grow to fill the available system memory and swap. Because the /tmp directory is used by all applications and users, an application can fill all available system memory. Register. If you are a new customer, register now for access to product evaluations and purchasing capabilities. Need access to an account? If your company has an existing Red Hat account, your organization administrator can grant you access. 1 . Login to you server with root access. 2 . Check the current volume information using df command like below: 3 . Next check how much tmpfs space is beeing used using du command like below. 4 . Lets resize the tmpfs volume by remounting it with a new size parameter. 5. Verify the made changes ... tmpfs is a temporary filesystem that resides in memory and/or your swap partition(s), depending on how much you fill it up. Mounting directories as tmpfs can be an effective way of speeding up accesses to their files, or to ensure that their contents are automatically cleared upon reboot. tmpfs are not really used as filesystems, but just take advantage of the filesystem abstraction. Applications can do I/O on a tmpfs. tmpfs functions reside purely in memory. Virtually, modern Linux distributions mount an instance of tmpfs at /dev/shm.