Play around with Linux partitions

Last time I split the partition, so this time I will use the split partition!

Setting items ① Mount (2) Capacity limit for each user ③ Authority setting ④ Symbolic link setting at mount point

① Mount

Mount / dev / sda5 of the extended area that was divided last time in the following order.

  1. Edit / etc / fstab 2, Execute mount command on / dev / sda5
[root@localhost ~]# fdisk -l
 ・ ・ ・
 ・ ・ ・ Abbreviation
 ・ ・ ・
   Device Boot      Start         End      Blocks   Id  System
/dev/sda1            2048     2099199     1048576   83  Linux
/dev/sda2         2099200     8390655     3145728    5  Extended
 / dev / sda5 2101248 4198399 1048576 83 Linux ← This

Check the current mount status. Execute the mount command as it is.

[root@localhost ~]# mount
sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime,seclabel)
proc on /proc type proc (rw,nosuid,nodev,noexec,relatime)
 ・ ・ ・
 ・ ・ ・ Abbreviation
 ・ ・ ・
 # / Dev / sda5 is missing
/dev/sda1 on / type xfs (rw,relatime,seclabel,attr2,inode64,noquota)

1. Edit / etc / fstab

Make a backup first.

[root@localhost ~]# cp -p /etc/fstab /etc/fstab.bak
[root@localhost ~]# vi /etc/fstab

Added / dev / sda5 / home2 ext4 defaults 1 2 to the end of the line.

** Meaning of each item ** / dev / sda5 ・ ・ ・ Device file name to mount / home2 ・ ・ ・ Directory to connect with / dev / sda5 (absolute path) ext4 ・ ・ ・ File system type (reiserfs, xfs, etc.) defaults ・ ・ ・ Mount options are default 1 ... Whether backup is required (1: required, 2: unnecessary) 2 ... Order when checking with the fsck command

 Created by anaconda on Sat Jun  1 17:13:31 2019

 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=8ac075e3-1124-4bb6-bef7-a6811bf8b870 /                       xfs     defaults        0 0
/swapfile none swap defaults 0 0
 / dev / sda5 / home2 ext4 defaults 1 2 ← Add here

Since the mount destination directory / home2 was not created, create it and execute the mount command.

[root@localhost ~]# mkdir /home2
[root@localhost ~]# mount -a
mount: special device /dev/sda5 does not exist

that? It is said that there is no such thing. But it comes out with fdisk -l, so check the device file.

[root@localhost ~]# ls /dev/sda*
/dev/sda  /dev/sda1

There is no device file. After restarting, I thought that the device file would not be created and restarted.

[root@localhost ~]# systemctl reboot
grub rescue>

The OS has stopped booting ... When I tried to start the PC, I got impatient with "unknown file system" Not fixed. Upon further investigation, I found an article in the same situation as myself. Apparently, boot the OS via USB or DVD and reinstall the OS. I'm using a virtual machine this time, so I decided to vagrant up again.

$ vagrant status
Current machine states:
 Erase this
default                   poweroff (virtualbox)

The VM is powered off. To restart the VM, simply run `vagrant up`
 $ vagrant destroy ← Delete
    default: Are you sure you want to destroy the 'default' VM? [y/N] y
==> default: Destroying VM and associated drives...
7$ vagrant status
Current machine states:
default                   not created (virtualbox)
 $ vagrant up ← up again

I went back to the beginning ... Next time I want to complete ① to ④! !!

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