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https://www.golinuxcloud.com/change-tmpfs-partition-size-redhat-linux/

Default:

none     /dev/shm       tmpfs   defaults                0 0
To:

none     /dev/shm       tmpfs   defaults,size=2G        0 0
For the changes to take effect immediately remount /dev/shm:

# mount -o remount /dev/shm