最後更新: 2024-09-06

介紹

systemd.mount — Mount unit configuration

A unit configuration file whose name ends in ".mount"

unit file 的名稱係有意思的, 如

mount /home/data 相當於要有 home-data.mount

目錄

• Example: 設定 2M hugepage 的 mountpoint
• Settings

Example: 設定 2M hugepage 的 mountpoint

dev-hugepages.mount

dev-hugepages.mount 預設會建立 /dev/hugepages

mount | grep ^huge

hugetlbfs on /dev/hugepages type hugetlbfs (rw,relatime,pagesize=1024M)

(/lib/systemd/system/dev-hugepages.mount)

由於要同時使用 2M 及 1G, 以免混淆, 所以要 disable 先.

Step 1: mask 了原本的 dev-hugepages.mount

systemctl stop dev-hugepages.mount

systemctl mask dev-hugepages.mount

Step 2: 建立新的 hugepages2M 及 hugepages1G

/etc/systemd/system/dev-hugepages2M.mount

[Unit]
Description=Huge Pages File System
DefaultDependencies=no
Before=sysinit.target
ConditionPathExists=/sys/kernel/mm/hugepages
ConditionCapability=CAP_SYS_ADMIN
ConditionVirtualization=!private-users

[Mount]
What=hugetlbfs
Where=/dev/hugepages2M
Type=hugetlbfs
Options=nofail,pagesize=2M

[Install]
WantedBy=sysinit.target

Info: target

 * 必須使用名稱 dev-hugepages2M.mount, 否則 start 時有 error

# hugepages2M.mount: Where= setting doesn't match unit name. Refusing.

systemctl daemon-reload

systemctl enable dev-hugepages2M.mount --now

# 如 dev-hugepages2M.mount 一樣建立 1G 版本

enable dev-hugepages1G.mount --now

Verify

systemctl status dev-hugepages2M.mount

mount | grep ^huge

Settings

Default Dependencies

 * The following dependencies are added unless "DefaultDependencies=no" is set

Mount units

referring to local file systems automatically gain an After= dependency on local-fs-pre.target, and a Before= dependency on local-fs.target unless one or more mount options among nofail, x-systemd.wanted-by=, and x-systemd.required-by= is set. See below for detailed information.

Additionally, an After= dependency on swap.target is added when the file system type is "tmpfs".

Network mount units

automatically acquire After= dependencies on remote-fs-pre.target, network.target, plus After= and Wants= dependencies on network-online.target, and a Before= dependency on remote-fs.target, unless one or more mount options among nofail, x-systemd.wanted-by=, and x-systemd.required-by= is set.

Options=

This takes a comma-separated list of options. This setting is optional.

e.g.

Options=defaults,nofail