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RHCSA (EX200) - 添加交换分区

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添加交换分区

向您的系统添加一个额外的交换分区 756MiB。交换分区应在系统 启动时自动挂载。不要删除或以任何方式改动系统上的任何现有交换分区。

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[root@node2 ~]# lsblk 
NAME            MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
vda             252:0    0   10G  0 disk 
├─vda1          252:1    0    1M  0 part 
├─vda2          252:2    0  100M  0 part /boot/efi
└─vda3          252:3    0  9.9G  0 part /
vdb             252:16   0    4G  0 disk 
├─vdb1          252:17   0  510M  0 part 
│ └─myvol-vo    253:0    0  232M  0 lvm  /reports
└─vdb2          252:18   0  512M  0 part 
  └─vgroup-swap 253:1    0  256M  0 lvm  [SWAP]
vdc             252:32   0   10G  0 disk
[root@node2 ~]# parted /dev/vdb unit MiB print
Model: Virtio Block Device (virtblk)
Disk /dev/vdb: 4096MiB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags: 

Number  Start    End      Size    Type     File system  Flags
 1      1.00MiB  511MiB   510MiB  primary
 2      511MiB   1023MiB  512MiB  primary

[root@node2 ~]# parted /dev/vdb mkpart primary 1024MiB 1780MiB
Information: You may need to update /etc/fstab.

[root@node2 ~]# mkswap /dev/vdb3 
mkswap: /dev/vdb3: warning: wiping old swap signature.
Setting up swapspace version 1, size = 756 MiB (792719360 bytes)
no label, UUID=114ea12c-6f82-420c-b1fe-1e9eb896cdb5
[root@node2 ~]# swapon /dev/vdb3 
[root@node2 ~]# swapon --show 
NAME      TYPE      SIZE USED PRIO
/dev/dm-0 partition 256M   0B   -2
/dev/vdb3 partition 756M   0B   -3
[root@node2 ~]# swapoff /dev/vdb3 
[root@node2 ~]# lsblk --fs 
NAME            FSTYPE      LABEL UUID                                   MOUNTPOINT
vda                          
├─vda1                       
├─vda2          vfat              399C-0F7D                              /boot/efi
└─vda3          xfs         root  3cd0d4ca-93f6-423b-a469-70ab2b10b667   /
vdb                          
├─vdb1          LVM2_member       Xrxvxp-xXd8-Bs15-k0hI-lVOT-fcLM-kvqbjA 
│ └─myvol-vo    ext4              64c880fa-00b3-43bd-8d38-3d36344bbf0a   /reports
├─vdb2          LVM2_member       e8VJoR-Cuzu-vufT-8UsH-zgJb-chQQ-QlBvVx 
│ └─vgroup-swap swap              822650ee-0dfc-4c0a-906d-99c71e784fca   [SWAP]
└─vdb3          swap              114ea12c-6f82-420c-b1fe-1e9eb896cdb5   
vdc                          
[root@node2 ~]# vim /etc/fstab 
...
UUID=114ea12c-6f82-420c-b1fe-1e9eb896cdb5 swap swap defaults 0 0
[root@node2 ~]# systemctl daemon-reload 
[root@node2 ~]# swapon -a
[root@node2 ~]# swapon --show 
NAME      TYPE      SIZE USED PRIO
/dev/dm-0 partition 256M   0B   -2
/dev/vdb3 partition 756M   0B   -3
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[root@node2 ~]# fdisk /dev/vdb

Welcome to fdisk (util-linux 2.32.1).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.


Command (m for help): n
Partition type
   p   primary (2 primary, 0 extended, 2 free)
   e   extended (container for logical partitions)
Select (default p): 

Using default response p.
Partition number (3,4, default 3): 
First sector (2095106-8388607, default 2097152): 
Last sector, +sectors or +size{K,M,G,T,P} (2097152-8388607, default 8388607): +756M

Created a new partition 3 of type 'Linux' and of size 756 MiB.

Command (m for help): w
The partition table has been altered.
Syncing disks.

默认情况下，parted 显示以 10 的幂次方表示的所有空间大小（KB、MB、GB）。您可以使用 unit 子命令来更改默认设置，该子命令接受以下参数：

s 表示扇区

B 表示字节

MiB、GiB 或 TiB（2 的幂次方）

MB、GB 或 TB（10 的幂次方）