從yum提示空間不足到根分區擴容
記錄一次安裝軟件的報錯
——[email protected]
1.系統版本（VMware 虛擬機）
|
[[email protected] ~]# cat /etc/redhat-release CentOS Linux release 7.3.1611 (Core) |
2.當執行yum安裝軟件時報如下錯
Error: Error writing to file /var/cache/yum/x86_64/7/epel/gen/filelists_db.sqlite: [Errno 28] No space left on device
是由於磁盤空間不夠，清除了部分無用日誌之後再次安裝
|
#yum install gitlab-ce -y ……………………………… Transaction Summary ===================================================================================================================== Install 1 Package Total download size: 378 M Installed size: 378 M Is this ok [y/d/N]: y Downloading packages: Error downloading packages: gitlab-ce-9.5.2-ce.0.el7.x86_64: Insufficient space in download directory /var/cache/yum/x86_64/7/gitlab-ce/packages * free 312 M * needed 378 M |
3.提示空間不足，剩余空間只有312M，查看磁盤使用空間發現根分區確實只剩313M了
|
[[email protected] ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/cl-root 6.2G 5.9G 313M 96% / #擴容的對象 devtmpfs 482M 0 482M 0% /dev tmpfs 493M 0 493M 0% /dev/shm tmpfs 493M 50M 443M 11% /run tmpfs 493M 0 493M 0% /sys/fs/cgroup /dev/sda1 1014M 139M 876M 14% /boot tmpfs 99M 0 99M 0% /run/user/0 /dev/sr0 680M 680M 0 100% /mnt [[email protected] boot]# df -h /var （/var目錄確實為312M） Filesystem Size Used Avail Use% Mounted on /dev/mapper/cl-root 6.2G 5.9G 312M 96% / |
4.於是開始擴容根分區
（1）添加磁盤
虛擬機——設置——添加——硬盤——下一步——選擇磁盤類型——下一步——填寫磁盤大小——完成
（2）查看磁盤
|
[[email protected] boot]# fdisk -l
Disk /dev/sda: 8589 MB, 8589934592 bytes, 16777216 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: 0x000b9a5e
Device Boot Start End Blocks Id System /dev/sda1 * 2048 2099199 1048576 83 Linux /dev/sda2 2099200 16777215 7339008 8e Linux LVM
Disk /dev/sdb: 21.5 GB, 21474836480 bytes, 41943040 sectors #添加的新磁盤 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: 0x4fddc909
Device Boot Start End Blocks Id System
Disk /dev/mapper/cl-root: 6652 MB, 6652166144 bytes, 12992512 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 /dev/mapper/cl-swap: 859 MB, 859832320 bytes, 1679360 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 |
（3）為新磁盤創建分區
|
創建分區： [[email protected] boot]# 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 #新建分區 Partition type: p primary (0 primary, 0 extended, 4 free) e extended Select (default p): p #選擇分區類型 Partition number (1-4, default 1): #默認為1（因為是新磁盤第一次創建分區） First sector (2048-41943039, default 2048): Using default value 2048 Last sector, +sectors or +size{K,M,G} (2048-41943039, default 41943039): #這裏我只創建一個分區所以默認是使用所有空間 Using default value 41943039 Partition 1 of type Linux and of size 20 GiB is set
Command (m for help): w #保存分區結果 The partition table has been altered!
Calling ioctl() to re-read partition table. Syncing disks. 讓系統重新讀取分區表： [[email protected] boot]# partprobe Warning: Unable to open /dev/sr0 read-write (Read-only file system). /dev/sr0 has been opened read-only. |
（4）擴容
由於sda已經為LVM所以可以直接為其擴容，無需再創建新的LVM
創建物理卷（PV）：
使用pvcreate命令創建物理卷，pvdisplay查看物理卷信息：
|
創建物理卷： [[email protected] boot]# pvcreate /dev/sdb1 Physical volume "/dev/sdb1" successfully created. 查看物理卷信息： [[email protected] boot]# pvdisplay --- Physical volume --- PV Name /dev/sda2 VG Name cl #原有盤上的PV PV Size 7.00 GiB / not usable 3.00 MiB Allocatable yes (but full) PE Size 4.00 MiB Total PE 1791 Free PE 0 Allocated PE 1791 PV UUID beyPTU-i2Ny-ltMw-0tfr-Me0b-Sz0Z-ybS4cy
"/dev/sdb1" is a new physical volume of "20.00 GiB" --- NEW Physical volume --- PV Name /dev/sdb1 VG Name #新建的PV的VG name是空的，下一步就是把PV加入VG PV Size 20.00 GiB Allocatable NO PE Size 0 Total PE 0 Free PE 0 Allocated PE 0 PV UUID 5N1q14-vf7Y-U1dm-1tkf-ZxAQ-16lE-pW2M5F |
查看原VG的情況
|
[[email protected] boot]# vgdisplay --- Volume group --- VG Name cl #註意記錄此名字，擴容時將新的pv加入指定的名字 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 7.00 GiB PE Size 4.00 MiB Total PE 1791 Alloc PE / Size 1791 / 7.00 GiB Free PE / Size 0 / 0 #發現空閑空間為0（以G計算） VG UUID l4mGeJ-090j-NZ1U-UOhI-c56R-0mtM-xiBm9h |
擴展卷組,將/dev/sdb物理卷添加到cl卷組中
再查看VG情況，可以看到VG大小變化，空余空間
將新的VG空間劃入LV（擴容lv_root）
直接擴展10G給/root分區，不用umount，也不需要重啟（擴張多大可根據添加的磁盤大小自由支配）
|
[[email protected] boot]# lvextend -L +10G /dev/mapper/cl-root Size of logical volume cl/root changed from 6.20 GiB (1586 extents) to 16.20 GiB (4146 extents). Logical volume cl/root successfully resized. |
也可以使用命令
# lvextend -l +50%FREE /dev/mapper/cl-root（表示將剩余空間的50%劃入LV）
使用xfs_growfs命令在線調整xfs格式文件系統大小（CentOS6使用resize2fs）
#xfs_growfs /dev/cl/root （因為CentOS7默認文件系統類型為xfs）
最後我們看到邏輯卷分區已經動態擴容到了11G：
至此一次CentOS7 根分區擴容順利完成
若為非商業用途，轉發請註明出處。
從yum提示空間不足到根分區擴容