MySQLLinux将MySQL数据库目录挂载至新数据盘

4.在home目录下边创立文件夹mysql,并且将配备挂载至/home/mysql。

[root@qxyw ~]# blkid
/dev/xvda1: UUID="5546dd0c-ef40-451b-b266-df8ef3a49967" TYPE="swap" 
/dev/xvda2: UUID="77fc0962-b3cf-400a-8903-0632e077fa09" TYPE="ext3" 
/dev/xvde1: UUID="1d17945b-c369-42de-85a8-47217d24d3e5" TYPE="ext4"
[root@qxyw /]# cd home
[root@qxyw home]# mkdir mysql
[root@qxyw home]# mv /var/lib/mysql/* /home/mysql
[root@qxyw home]# ln /home/mysql /var/lib/mysql

对此Linux系统来说,挂载磁盘的不二法门其实都大约,所以本文以CentOS系统为例,介绍下Linux系统磁盘挂载方法,后边半数以上情节出自天翼云的论坛。
1.查看磁盘情形
应用命令fdisk -l # 列出整个磁盘音信

5.将磁盘UUID写入fstab

[root@qxyw ~]# fdisk /dev/xvde
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel with disk identifier 0x590ca8b1.
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): n
Command action
   e   extended
   p   primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-39162, default 1): 
Using default value 1
Last cylinder, +cylinders or +size{K,M,G} (1-39162, default 39162): 
Using default value 39162

Command (m for help): p

Disk /dev/xvde: 322.1 GB, 322122547200 bytes
255 heads, 63 sectors/track, 39162 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: 0x590ca8b1

    Device Boot      Start         End      Blocks   Id  System
/dev/xvde1               1       39162   314568733+  83  Linux

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

Calling ioctl() to re-read partition table.
Syncing disks.
[root@qxyw mysql]# df
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/xvda2            37155392   2417608  32850400   7% /
tmpfs                  4018012         0   4018012   0% /dev/shm
/dev/xvde1           309633052    217092 293687524   1% /home/mysql

假使原来文件夹中有文件挂载之后文件会磨灭并且出现lost+found文件夹,那时不用操心,可以用umount命令举行撤销挂载。
由来是如此的。
其一牵扯到linux的VFS(虚拟文件系统)机制。登录未来,你看看的逐条目录,文件都是根本在加载时候协会在内存中的VFS目录树,而不是一贯看出硬盘上的莫过于目录树。
按照我对http://www.ibm.com/developerworks/cn/linux/l-vfs/那篇小说所描述的易懂精晓,当您挂载某个设备到一个VFS挂载点上时(比如/home),系统就把VFS中的那个挂载点/home指向您最终所挂载的要命设备上。那么你现在作客该挂载点时,就会看到您说到底挂载在那里的设备。而以前所挂载的装置如故在那边,只不过挂载点/home已经不复指向此前的配备。你可以把本来的装备卸载未来挂载到一个新的挂载点上来访问。

[root@qxyw ~]# mkfs.ext4 xvde1
mke2fs 1.41.12 (17-May-2010)
Could not stat xvde1 --- No such file or directory

The device apparently does not exist; did you specify it correctly?
[root@qxyw ~]# mkfs.ext4 /dev/xvde1
mke2fs 1.41.12 (17-May-2010)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
19660800 inodes, 78642183 blocks
3932109 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=4294967296
2400 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks: 
        32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208, 
        4096000, 7962624, 11239424, 20480000, 23887872, 71663616

Writing inode tables: done                            
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done

This filesystem will be automatically checked every 25 mounts or
180 days, whichever comes first.  Use tune2fs -c or -i to override.

2)通过vim /etc/fstab在最终一行添加xvde1的磁盘音信

 

[root@qxyw ~]# fdisk -l

Disk /dev/xvda: 42.9 GB, 42949672960 bytes
255 heads, 63 sectors/track, 5221 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: 0x0008a9a5

Device Boot          Start         End      Blocks   Id  System
/dev/xvda1               1         523     4194304   82  Linux swap / Solaris
Partition 1 does not end on cylinder boundary.
/dev/xvda2   *         523        5222    37747712   83  Linux

Disk /dev/xvde: 322.1 GB, 322122547200 bytes
255 heads, 63 sectors/track, 39162 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: 0x00000000

7.验证转眼,通过df命令查看磁盘的利用情状。然后进入mysql命令,创制数据库test1…,执行之后会在/home/mysql/文件夹下出现数据库test1,其它利用df命令查看磁盘使用意况。会发觉/dev/xvde1使用量在增强。

3.创设分区文件系统并格式化磁盘
# mkfs.ext4 /dev/xvde1 # 将xvde1以ext4格式进行格式化

6.将/var/lib/mysql/下的始末转移至/home/mysql/,并且在/var/lib/下创制mysql的链接,实际目录其实为/home/mysql

[root@qxyw home]# mount /dev/xvde1 /home/mysql
[root@qxyw home]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/xvda2             36G  2.4G   32G   7% /
tmpfs                 3.9G     0  3.9G   0% /dev/shm
/dev/xvde1            296G  191M  281G   1% /home/mysql

2.制造分区
 fdisk /dev/xvde # 对xvde硬盘举办分区
  n  # 创建一个新分区
  p  # 创设一个主分区(e为增添分区)
  1  # 1代表第四个主分区
  回车  # 从第1柱面初阶分区
  回车  #
表示所有xvde全写入第1分区(若须要将sdb分为多个分区,此时输入+分区大大小小)
  P  # 查看下已开立好的分区
  w  # 保存并脱离

#
# /etc/fstab
# Created by anaconda on Thu Jan 12 02:47:21 2017
#
# 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=77fc0962-b3cf-400a-8903-0632e077fa09 /                       ext3    defaults        1 1
UUID=5546dd0c-ef40-451b-b266-df8ef3a49967 swap                    swap    defaults        0 0
tmpfs                   /dev/shm                tmpfs   defaults        0 0
devpts                  /dev/pts                devpts  gid=5,mode=620  0 0
sysfs                   /sys                    sysfs   defaults        0 0
proc                    /proc                   proc    defaults        0 0
UUID=d17945b-c369-42de-85a8-47217d24d3e5 /home/mysql ext4 defaults      0 0

对于Linux系统来说,磁盘xvda和xvde的分区是基于系统启动时识别的先后顺序来排列,那样就会产出一个当主机重启后,出现跳盘的意况,为了防止此情景的暴发,就须求我们将磁盘的UUID音讯写入fstab文件,将分区与磁盘绑定。
1)通过blkid得到磁盘分区的UUID

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