Linux系统系统盘扩容

  在Linux学习过程中,可能会遇到根目录存储空间不足的问题,这时候若是只是新增一块硬盘并挂载到某个目录上,还需要将数据转移至新的硬盘中才气缓解存储压力。这种操作未免有些繁琐,那可不可以直接对跟目录举行扩容呢?当然是可以的,接下来就给人人先容操作步骤:

  实验环境:RHEL7系统(默认已部署LVM)、VMware Workstation 12虚拟软件

  第1步:给虚拟机新增一块20GB的硬盘

Linux系统系统盘扩容

   第2步:查看系统盘的分区类型,最后记得输入q不保留退出

[root@linuxprobe ~]# fdisk /dev/sda Welcome to fdisk (util-linux 2.23.2). Changes will remain in memory only, until you decide to write them. Be careful before using the write command. Command (m for help): p  //输入p查看分区信息 Disk /dev/sda: 21.5 GB, 21474836480 bytes, 41943040 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk label type: dos Disk identifier: 0x00091636 Device Boot Start End Blocks Id System /dev/sda1   *        2048     1026047      512000   83 Linux /dev/sda2         1026048    41943039    20458496   8e  Linux LVM //分区类型为Linux LVM

 Command (m for help): q     //输入q不保留退出

  第3步:对新硬盘举行分区,并设置分区类型

[root@linuxprobe ~]# fdisk /dev/sdb Welcome to fdisk (util-linux 2.23.2). Changes will remain in memory only, until you decide to write them. Be careful before using the write command. Command (m for help): n //添加一个新分区 Partition type: p primary (0 primary, 0 extended, 4 free) e extended Select (default p): p //主分区 Partition number (1-4, default 1): 1 //分区编号为1 First sector (2048-41943039, default 2048): <此处按下回车键> Using default value 2048 Last sector, +sectors or +size{K,M,G} (2048-41943039, default 41943039): +10G //分区巨细为10GB Partition 1 of type Linux and of size 10 GiB is set Command (m for help): p //再次查看分区信息 Disk /dev/sdb: 21.5 GB, 21474836480 bytes, 41943040 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk label type: dos Disk identifier: 0x1894a517 Device Boot Start End Blocks Id System /dev/sdb1            2048    20973567    10485760   83 Linux //新的分区添加乐成,不外分区类型纰谬 Command (m for help): t //调换分区的类型 Selected partition 1 Hex code (type L to list all codes): 8e //输入8e即"Linux LVM" Changed type of partition 'Linux' to 'Linux LVM' Command (m for help): p //再次查看分区信息 Disk /dev/sdb: 21.5 GB, 21474836480 bytes, 41943040 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk label type: dos Disk identifier: 0x1894a517 Device Boot Start End Blocks Id System /dev/sdb1            2048    20973567    10485760 8e Linux LVM //分区类型调换乐成,与系统分区一致 Command (m for help): w //最后记得要保留退出 The partition table has been altered! Calling ioctl() to re-read partition table. Syncing disks.

  第4步:让新添加的硬盘分区支持LVM手艺

[root@linuxprobe ~]# pvcreate /dev/sdb1 Physical volume "/dev/sdb1" successfully created

  第5步:查看当前系统的卷组,并将/dev/sdb1硬盘分区加入到卷组中

Spring Boot从入门到精通(八)日志管理实现和配置信息分析

[root@linuxprobe ~]# vgdisplay --- Volume group --- VG Name rhel //卷组名为"rhel"
 System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 3 VG Access read/write VG Status resizable MAX LV 0 Cur LV 2 Open LV 2 Max PV 0 Cur PV 1 Act PV 1 VG Size 19.51 GiB     //卷组的总容量巨细
  PE Size               4.00 MiB Total PE 4994 Alloc PE / Size       4994 / 19.51 GiB Free PE / Size       0 / 0 VG UUID mGomiV-U0sF-wKii-YxOh-V7Gw-VEQ4-yIkcRD [root@linuxprobe ~]# vgextend rhel /dev/sdb1         //把/dev/sdb1硬盘分区加入到rhel卷组中
  Volume group "rhel" successfully extended [root@linuxprobe ~]# vgdisplay --- Volume group --- VG Name rhel System ID Format lvm2 Metadata Areas 2 Metadata Sequence No 4 VG Access read/write VG Status resizable MAX LV 0 Cur LV 2 Open LV 2 Max PV 0 Cur PV 2 Act PV 2 VG Size 29.50 GiB //卷组的容量增大了10GB PE Size 4.00 MiB Total PE 7553 Alloc PE / Size       4994 / 19.51 GiB Free PE / Size       2559 / 10.00 GiB VG UUID mGomiV-U0sF-wKii-YxOh-V7Gw-VEQ4-yIkcRD

  第6步:查看当前逻辑卷信息

[root@linuxprobe ~]# lvdisplay --- Logical volume --- LV Path /dev/rhel/swap //用来充当SWAP分区,我们这里不管它 LV Name swap VG Name rhel LV UUID d2gNWI-6Oin-9Q3r-OGLp-0nf5-0Dun-Z8EvgS LV Write Access read/write LV Creation host, time localhost, 2020-02-15 20:19:35 +0800 LV Status available # open 2 LV Size 2.00 GiB Current LE 512 Segments 1 Allocation inherit Read ahead sectors auto - currently set to     256 Block device 253:1
   
  --- Logical volume --- LV Path /dev/rhel/root  //该逻辑卷现实就是Linux系统盘,我们将对它举行扩容  LV Name root //逻辑卷名为root VG Name rhel LV UUID rI6Xvu-eCJx-0WFO-TuUj-LQWM-WuUc-3uE6zc LV Write Access read/write LV Creation host, time localhost, 2020-02-15 20:19:35 +0800 LV Status available # open 1 LV Size 17.51 GiB //逻辑卷的巨细,即系统盘巨细 Current LE 4482 Segments 1 Allocation inherit Read ahead sectors auto - currently set to     256 Block device 253:0

  第7步:对root逻辑卷举行扩容操作

[root@linuxprobe ~]# lvextend -L +10G /dev/rhel/root Extending logical volume root to 27.51 GiB Insufficient free space: 2560 extents needed, but only 2559 available   //显示现实空闲容量不足10GB,比10GB稍微小一点点
[root@linuxprobe ~]# lvextend -L +5G /dev/rhel/root    //这里我们先扩容5GB
  Extending logical volume root to 22.51 GiB Logical volume root successfully resized [root@linuxprobe ~]# lvdisplay ----------------省略部门输出内容------------------------
   
  --- Logical volume --- LV Path /dev/rhel/root LV Name root VG Name rhel LV UUID rI6Xvu-eCJx-0WFO-TuUj-LQWM-WuUc-3uE6zc LV Write Access read/write LV Creation host, time localhost, 2020-02-15 20:19:35 +0800 LV Status available # open 1 LV Size 22.51 GiB //容量已从17.51GB提升至22.51GB Current LE 5762 Segments 2 Allocation inherit Read ahead sectors auto - currently set to     8192 Block device 253:0

  第8步:重置root逻辑卷的巨细。xfs系统不需要先umount操作

[root@linuxprobe ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/rhel-root   18G  3.1G   15G  18% / devtmpfs 985M 0  985M   0% /dev tmpfs 994M 80K 994M 1% /dev/shm tmpfs 994M 8.9M  986M   1% /run tmpfs 994M 0  994M   0% /sys/fs/cgroup /dev/sr0               3.5G  3.5G     0 100% /media/cdrom /dev/sda1              497M  119M  379M  24% /boot [root@linuxprobe ~]# xfs_growfs /dev/rhel/root //重置root逻辑卷巨细 meta-data=/dev/mapper/rhel-root  isize=256    agcount=4, agsize=1147392 blks =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=0 data =                       bsize=4096   blocks=4589568, imaxpct=25
         =                       sunit=0      swidth=0 blks naming =version 2              bsize=4096   ascii-ci=0 ftype=0 log =internal               bsize=4096   blocks=2560, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1 realtime =none                   extsz=4096   blocks=0, rtextents=0 data blocks changed from 4589568 to 5900288 [root@linuxprobe ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/rhel-root   23G  3.1G   20G  14% /       //系统盘乐成扩容至23G,且重启依然生效 devtmpfs 985M 0  985M   0% /dev tmpfs 994M 80K 994M 1% /dev/shm tmpfs 994M 8.9M  986M   1% /run tmpfs 994M 0  994M   0% /sys/fs/cgroup /dev/sr0               3.5G  3.5G     0 100% /media/cdrom /dev/sda1              497M  119M  379M  24% /boot

 至此,Linux系统盘扩容操作完毕。

 知识弥补:

  1、重置逻辑卷下令 “xfs_growfs /dev/rhel/root” 和 “xfs_growfs /dev/mapper/rhel-root” 效果一样;

  2、若是是ext4文件系统,重置下令为”resize2fs /dev/rhel/root”;

  3、xfs文件系统只能扩容,不允许缩容。

 

[root@linuxprobe ~]# pvs PV VG Fmt Attr PSize PFree /dev/sda2  rhel lvm2 a--  19.51g    0 
  /dev/sdb1  rhel lvm2 a--  10.00g 5.00g //还省5GB空闲容量

 

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