linux系统中的磁盘管理

柔情只为你懂 2022-02-03 06:27 301阅读 0赞

## 一.本地存储系统的识别 ##

fdisk -l			    ##真实存在的设备
    cat /proc/partition		##系统识别的设备
    blkid				    ##系统可使用的设备
    df				        ##系统正在挂载的设备

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70]![在这里插入图片描述][20190508220113889.png]

## 二.设备的挂载和卸载 ##

1.设备名称  
/dev/xdx \#\#/dev/hd0 /dev/hd1 /dev/sda /dev/sdb /dev/sda1 /dev/sda2 /dev/sdb1  
/dev/sr0 \#\#光驱  
/dev/mapper/\* \#\#虚拟设备

2.设备的挂载  
由于虚拟机的空间不够，这里给虚拟机加了一块20G的虚拟硬盘

首先关闭虚拟机，进入虚拟机管理页面点击右上方灯泡  
点击添加![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 1]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 2]

mount  设备	挂载点
    mount /dev/sdb1	 /mnt			##挂载sdb1到mnt
    umount /mnt| /dev/sdb1			##卸载
    mount -o ro /dev/sdb1	 /mnt		##只读挂载
    mount 					##查看挂载信息
    mount -o remount,rw /dev/sdb1 | /mnt	##重新读写挂载

3.解决设备正忙情况

[root@foundation0 ~]# umount /mnt/
    umount: /mnt: target is busy.			##有程序在使用此设备
            (In some cases useful info about processes that 
             the device is found by lsof(8) or fuser(1))

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 3]

解决方法1
    fuser -kvm /mnt
    umount /mnt

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 4]

解决方法2
    lsof /mnt
    [root@foundation0 ~]# lsof /mnt/
    lsof: WARNING: can't stat() fuse.gvfsd-fuse file system /run/user/1000/gvfs
          Output information may be incomplete.
    COMMAND   PID USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
    bash    27446 root  cwd    DIR   8,17     4096    2 /mnt
    
    kill -9 27446
    umount /mnt

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 5]

## 三.磁盘分区 ##

1.硬盘0磁道1扇区的512个字节中记录的信息如下

512=446 + 64 + 2  
^ ^ ^  
mbr(主引导记录) mpt(主分区标) 55aa(硬盘的有效性标实)

硬盘分区标  
64  
1个分区占用16个字节  
1块硬盘上最多可以划分**4个主分区**

2.分区步骤

1.fdisk -l
    2.fdisk /dev/vdb

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 6]  
m(help)

<table> 
 <thead> 
  <tr> 
   <th>a</th> 
   <th>toggle a bootable flag</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>b</td> 
   <td>edit bsd disklabel</td> 
  </tr> 
  <tr> 
   <td>c</td> 
   <td>toggle the dos compatibility flag</td> 
  </tr> 
  <tr> 
   <td>d</td> 
   <td>delete a partition ##删除</td> 
  </tr> 
  <tr> 
   <td>g</td> 
   <td>create a new empty GPT partition table</td> 
  </tr> 
  <tr> 
   <td>G</td> 
   <td>create an IRIX (SGI) partition table</td> 
  </tr> 
  <tr> 
   <td>l</td> 
   <td>list known partition types</td> 
  </tr> 
  <tr> 
   <td>m</td> 
   <td>print this menu</td> 
  </tr> 
  <tr> 
   <td>n</td> 
   <td>add a new partition ##新建</td> 
  </tr> 
  <tr> 
   <td>o</td> 
   <td>create a new empty DOS partition table</td> 
  </tr> 
  <tr> 
   <td>p</td> 
   <td>print the partition table ##显示分区信息</td> 
  </tr> 
  <tr> 
   <td>q</td> 
   <td>quit without saving changes ##退出</td> 
  </tr> 
  <tr> 
   <td>s</td> 
   <td>create a new empty Sun disklabel</td> 
  </tr> 
  <tr> 
   <td>t</td> 
   <td>change a partition’s system id ##修改分区id</td> 
  </tr> 
  <tr> 
   <td>u</td> 
   <td>change display/entry units</td> 
  </tr> 
  <tr> 
   <td>v</td> 
   <td>verify the partition table</td> 
  </tr> 
  <tr> 
   <td>w</td> 
   <td>write table to disk and exit ##保存分区标信息到硬盘</td> 
  </tr> 
  <tr> 
   <td>x</td> 
   <td>extra functionality (experts only)</td> 
  </tr> 
 </tbody> 
</table>

3.建立主分区  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 7]当系统已经有三个主分区时  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 8]

## 四.给设备安装文件系统 ##

ext3	rhel5及之前的版本	最多支持32TB的文件系统和2t文件，实际2tb文件系统，16G文件
    ext4	rhel6			1EB		16TB
    xfs	rhel7			18EB		9eb             7G/s	4G/s
    mkfs.xfs	 /dev/vdb1	           ##新创建的分区需要格式化才能使用
    mount /dev/vdb1	 /mnt

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 9]![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 10]

reboot  ##重启虚拟机

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 11]  
由上述挂载找不到，可知上面的挂载是临时挂载

永久挂载
    vim /etc/fstab
     设备		   挂载点	文件系统	 挂载参数	是否备份	 是否检测
    /dev/vdb1	   /mnt	     xfs	defaults	  0		0
    
    mount -a          ## 将/etc/fstab中定义的所有档案系统挂上

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 12]![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 13]  
重启后

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 14]

## 五.swap分区的管理 ##

1） swap分区的建立  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 15]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 16]

mkswap	/dev/vdb2
    swapon	-a /dev/vdb2
    swapon -s
    vim /etc/fstab
    /dev/vdb2   swap	swap	defaults	0 0

![在这里插入图片描述][20190509203832850.png]![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 17]

2)swap分区删除
    vim /etc/fstab   ##首先删除或注释此文件中有关于我们要删除的swap分区的设置
    
    swapoff	 /dev/vdb2
    swapon -s       ##显示当前交换区状态
    fdisk /dev/vdb   
    d        ##删除第二块分区/dev/vdb2
    2
    wq
    partprobe    ##同步分区表

![在这里插入图片描述][20190509204904466.png]![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 18]

## 六.配额 ##

配额作用：简单的说就是限制用户对磁盘空间的使用量。因为Linux是多用户多任务的操作系统，许多人共用磁盘空间，为了合理的分配磁盘空间，于是就有了quota的出现。  
配额是针对分区的。

mkfs.xfs  /dev/vdb1                   ##先格式化/dev/vdb1
    mkdir /public
    mount -o usrquota /dev/vdb1	/public   ##让/public有额度属性
    chmod 777 /public
    quotaon -uv /dev/vdb1                 ##激活

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 19]![在这里插入图片描述][20190509213519913.png]

edquota -u studnet                    ##编辑额度默认是K
    
    vim /etc/fstab
    /dev/vdb1	/public		xfs	defaults,usrquota	0	0

![在这里插入图片描述][20190509213634672.png]![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 20]测试：  
![在这里插入图片描述][20190509213818571.png]

## 七.磁盘加密 ##

LUKS(Linux Unified Key Setup)为Linux硬盘加密提供了一种标准，操作简单，只有在挂载磁盘时需要输入密码，在写入和读取磁盘时不需要。  
当然我们在日常的服务器运维中几乎很少会给磁盘进行加密，不过可以对U盘进行加密。

cryptsetup luksFormat   /dev/vdb1      给磁盘加密

![在这里插入图片描述][20190509214939818.png]

cryptsetup open /dev/vdb1      meng      用meng打开/dev/vdb1   后面跟的名称可自定义
    mkfs.xfs  /dev/mapper/meng               生成一个虚拟设备，去格式化使其能用       
    mount /dev/mapper/meng  /mnt/              挂载
    touch /mnt/file{1..3}                       建立文件
    umount /mnt/                                   卸载
    cryptsetup close meng                    关闭

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 21]

cryptsetup open /dev/vdb1 westos    ##以westos这个名字打开它
    ll /dev/mapper/
    mkfs.xfs /dev/mapper/westos 
    mkdir /westos
    mount /dev/mapper/westos /westos/
    touch /westos/file{1..3}

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 22]![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 23]

umount /westos
    cryptsetup close westos

![在这里插入图片描述][20190509220029775.png]

cryptsetup open /dev/vdb1 haha     ##再次以haha这个名字打开
    mount /dev/mapper/haha /westos/    ##挂载

![在这里插入图片描述][2019050922030222.png]`vim /etc/fstab ##编辑加密设备自动挂载`  
![在这里插入图片描述][20190509220632269.png]

vim /root/passwd    文件中写入密码
    chmod 600  /root/passwd

![在这里插入图片描述][20190509221139893.png]

vim /etc/crypttab    ##写入开启设备的名字，设备，以及密码文件

![在这里插入图片描述][20190509221404868.png]

cryptsetup luksAddKey /dev/vdb2 /root/passwd    ##将加密设备的密码指向告诉系统
    reboot                                          ##重启，检测加密设备有没有自动挂载

![在这里插入图片描述][20190509222023252.png]

vim /etc/fstab ##删除自动挂载内容 
    cryptsetup luksRemoveKey /dev/vdb2 /root/passwd ##解除关系 
    umount /westos ##卸载设备 
    cryptsetup close haha 
    mkfs.xfs /dev/vdb2 -f ##强制格式化设备

![在这里插入图片描述][20190509222417291.png]

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