[20230322]mount systemd.txt

[20230322]mount systemd.txt

--//別人的系統每次重啟機器發現本地的一個ISO映象檔案總是mount 到/mnt/iso目錄。而檢查/etc/fstab檔案這項mount並不存在。
--//我記憶裡好像看過systemdctl可以管理mount選項，這樣/etc/fstab可以不存在。

--//找到如下連結:


--//實際上我猜測mount上後,在/run/systemd/generator/就存在這項.然後cp到/etc/systemd/system/目錄.
--//我當時移動/etc/systemd/system/下對應檔案到另外的地方,無法繼續測試.在自己管理的伺服器上檢視如下:

# cat /etc/fstab
#
# /etc/fstab
# Created by anaconda on Tue Nov 10 19:36:09 2020
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
UUID=67a1c5a7-1875-4fb4-a49f-54db7e5bff2c /                       xfs     defaults        0 0
UUID=4d847c59-3180-4a5d-b813-5c691d04968f /u01                    xfs     defaults        0 0
UUID=9f6761e1-d91e-4354-af11-82c094ffa0da swap                    swap    defaults        0 0
UUID=dea6f8c9-e39e-46a5-b409-b7a8c14e1d8b /u02                   ext4 defaults 0 0


# ls -lR /run/systemd/generator
/run/systemd/generator:
total 16
-rw-r--r--. 1 root root 209 2022-10-26 09:49:39 dev-disk-by\x2duuid-9f6761e1\x2dd91e\x2d4354\x2daf11\x2d82c094ffa0da.swap
drwxr-xr-x. 2 root root 100 2022-10-26 09:49:39 local-fs.target.requires
-rw-r--r--. 1 root root 250 2022-10-26 09:49:39 -.mount
drwxr-xr-x. 2 root root  60 2022-10-26 09:49:39 swap.target.requires
-rw-r--r--. 1 root root 253 2022-10-26 09:49:39 u01.mount
-rw-r--r--. 1 root root 254 2022-10-26 09:49:39 u02.mount

/run/systemd/generator/local-fs.target.requires:
total 0
lrwxrwxrwx. 1 root root 30 2022-10-26 09:49:39 -.mount -> /run/systemd/generator/-.mount
lrwxrwxrwx. 1 root root 32 2022-10-26 09:49:39 u01.mount -> /run/systemd/generator/u01.mount
lrwxrwxrwx. 1 root root 32 2022-10-26 09:49:39 u02.mount -> /run/systemd/generator/u02.mount

/run/systemd/generator/swap.target.requires:
total 0
lrwxrwxrwx. 1 root root 96 2022-10-26 09:49:39 dev-disk-by\x2duuid-9f6761e1\x2dd91e\x2d4354\x2daf11\x2d82c094ffa0da.swap -> /run/systemd/generator/dev-disk-by\x2duuid-9f6761e1\x2dd91e\x2d4354\x2daf11\x2d82c094ffa0da.swap

--//看看"-.mount"檔案,實際上這個對應的是/.使用-代替.
# cat -- '-.mount'
# Automatically generated by systemd-fstab-generator
[Unit]
SourcePath=/etc/fstab
Documentation=man:fstab(5) man:systemd-fstab-generator(8)
Before=local-fs.target

[Mount]
What=/dev/disk/by-uuid/67a1c5a7-1875-4fb4-a49f-54db7e5bff2c
Where=/
Type=xfs

--//說句老是話,我到現在還無法適應systemctl管理啟動服務.不知道自己是否老了,對應新的知識接收比較慢.