RHEL7系统管理

Present Syntax Highlighted Code

<section>
  <h2>Tabular Tables</h2>
  <table>
    <thead>
      <tr>
        <th>Item</th>
        <th>Value</th>
        <th>Quantity</th>
      </tr>
    </thead>
    <tbody>
      <tr>
        <td>Apples</td>
        <td>$1</td>
        <td>7</td>
      </tr>
      <tr>
        <td>Lemonade</td>
        <td>$2</td>
        <td>18</td>
      </tr>
      <tr>
        <td>Hand Sanitizer</td>
        <td>$999</td>
        <td>2</td>
      </tr>
    </tbody>
  </table>
</section>

# PRESENTING CODE

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[root@localhost ~]# fdisk /dev/sdb
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel with disk identifier 0x8c2e8e16.
Changes will remain in memory only, until you decide to write them.
After that, of course, the previous content won't be recoverable.

Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)

WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
         switch off the mode (command 'c') and change display units to
         sectors (command 'u').

Command (m for help): p

Disk /dev/sdb: 451.0 GB, 450971566080 bytes
255 heads, 63 sectors/track, 54827 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x8c2e8e16

   Device Boot      Start         End      Blocks   Id  System

Command (m for help): n
Command action
   e   extended
   p   primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-54827, default 1): 
Using default value 1
Last cylinder, +cylinders or +size{K,M,G} (1-54827, default 54827): 
Using default value 54827

Command (m for help): t
Selected partition 1
Hex code (type L to list codes): 8e
Changed system type of partition 1 to 8e (Linux LVM)

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.
Syncing disks.

Syncing disks.
[root@localhost ~]# partprobe

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[root@serverX ~]# gdisk /dev/vdb
GPT fdisk (gdisk) version 0.8.6

Partition table scan: 
  MBR: not present
  BSD: not present
  APM: not present
  GPT: not present 
  
Creating new GPT entries.

Command(? for help): n

Partition number (1-128, default 1): 1

First sector (34-20971486, default = 2048) or (+-)size (KMGTP): 2048

Last sector (2048-20971486, default = 20971486) or +-] size (KMGTP): 1050623

Last sector (2048-20971486, default = 20971486) or (+-] size (KMGTP): +512M

Last sector (2048-20971486, default = 20971486) or (+-) size (KMGTP): -512M

Current type is 'Linux filesystem'
Hex code or GUID (L to show codes, Enter = 8300): 8e00
Changed type of partition to 'Linux LVM'

Command (? for help): w 

Final checks complete. About to write GPT data. THIS WILL OVERWRITE EXISTING PARTITIONS!!

Do you want to proceed? (Y/N): y 
OK; writing new GUID partition table (GPT) to /dev/vdb.
The operation has completed successfully.

[root@serverX ~]# partprobe /dev/vdb

[root@serverX ~]# gdisk /dev/vdb
GPT fdisk (gdisk) version 0.8.6

Partition table scan: 
  MBR: not present
  BSD: not present
  APM: not present
  GPT: not present 
  
Creating new GPT entries.

Command (? for help): p 
Disk /dev/vdb: 20971520 sectors, 10.0 GiB 
Logical sector size: 512 bytes 
Disk identifier (GUID) : 8B181B97-5259-4C8F-8825-1A973B8FA553
Partition table holds up to 128 entries 
First usable sector is 34, last usable sector is 20971486
Partitions will be aligned on 2048-sector boundaries 
Total free space is 19922877 sectors (9.5 GiB)

Number 	Start (sector) 	End (sector) 		Size 			Code 	Name
1 			2048			1050623 		512.0 MiB 		8E00 	Linux LVM

Command (? for help): d
Using 1

Command (? for help): w 

Final checks complete. About to write GPT data. THIS WILL OVERWRITE EXISTING PARTITIONS!!

Do you want to proceed? (Y/N): y 
OK; writing new GUID partition table (GPT) to /dev/vdb.
The operation has completed successfully.

[root@serverX ~]# partprobe /dev/vdb