Default tmpfs configuration-优快云博客

本文介绍如何在Linux系统中初始化RAM磁盘并挂载tmpfs文件系统，包括为/dev/shm和/run目录设置合适的参数。此外，还讨论了如何限制tmpfs文件系统的大小，以避免占用过多内存。

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/boot/initramfs-$(uname -r).img

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if ! ismounted /dev/shm; then
mkdir -m 0755 /dev/shm
mount -t tmpfs -o mode=1777,nosuid,nodev,strictatime tmpfs /dev/shm >/dev/null
fi
if ! ismounted /run; then
mkdir -m 0755 /newrun
mount -t tmpfs -o mode=0755,nosuid,nodev,strictatime tmpfs /newrun >/dev/null
cp -a /run/* /newrun >/dev/null 2>&1
mount --move /newrun /run
rm -fr -- /newrun
fi

/usr/lib/dracut/modules.d/99base/init.sh

The size of a tmpfs filesystem is actually the maximum amount of space that it could use. When the filesystem is empty, it is no using any memory. It won't allow the filesystem to contain more than that size of data, which defaults to 50 of RAM.

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mount -t tmpfs -o mode=1777,nosuid,nodev,strictatime,size=20% tmpfs /dev/shm >/dev/null
mount -t tmpfs -o mode=1777,nosuid,nodev,strictatime,size=10m tmpfs /dev/shm >/dev/null
mount -t tmpfs -o mode=1777,nosuid,nodev,strictatime,nr_blocks=1000 tmpfs /dev/shm >/dev/null