Centos 扩容根分区
当磁盘根分区不足时检查物理设备是否还有可用空间。如没有可用空间可新增一块硬盘来进行扩容根目录。
lsblk
像这种就直接分区扩容即可 物理磁盘还有400G。
fdisk /dev/vda
打印下分区 看看目前可用的分区是否和之前查看的一样。
接下来创建新分区
再次打印下分区
分区已经创建完成。
接下来需要重启下机器 ，可能会找不到新建的分区vda3 。
重启完机器之后 直接格式化vda3 一步一步扩容即可。不必纠结hostname，一下了扩容很多台没注意从哪台机器截图拷贝出来的。
[root@bigops-4 ~]# vgextend centos /dev/vda3 ----准备扩容分区
[root@bigops-4 ~]# lvextend -L +400G /dev/centos/root /dev/vda3 ---扩容文件系统vda3 到根目录
[root@bigops-4 ~]# xfs_growfs /dev/centos/root #####扩展文件系统
[root@bigops-4 ~]# mkfs.ext4 /dev/vda vda vda1 vda2 vda3 [root@bigops-4 ~]# mkfs.ext4 /dev/vda3 ---格式化分区 mke2fs 1.42.9 (28-Dec-2013) Filesystem label= OS type: Linux Block size=4096 (log=2) Fragment size=4096 (log=2) Stride=0 blocks, Stripe width=0 blocks 26214400 inodes, 104857600 blocks 5242880 blocks (5.00%) reserved for the super user First data block=0 Maximum filesystem blocks=2252341248 3200 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, 78675968, 102400000 Allocating group tables: done Writing inode tables: done Creating journal (32768 blocks): done Writing superblocks and filesystem accounting information: done [root@bigops-4 ~]# lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sr0 11:0 1 422K 0 rom vda 252:0 0 500G 0 disk ├─vda1 252:1 0 1G 0 part /boot ├─vda2 252:2 0 99G 0 part │ ├─centos-root 253:0 0 50G 0 lvm / │ ├─centos-swap 253:1 0 7.9G 0 lvm [SWAP] │ └─centos-home 253:2 0 41.1G 0 lvm /home └─vda3 252:3 0 400G 0 part [root@bigops-4 ~]#
[root@bigops-4 ~]# [root@bigops-4 ~]# vgextend centos /dev/vda vda vda1 vda2 vda3 [root@bigops-4 ~]# vgextend centos /dev/vda3 ----准备扩容分区 WARNING: ext4 signature detected on /dev/vda3 at offset 1080. Wipe it? [y/n]: y Wiping ext4 signature on /dev/vda3. Physical volume "/dev/vda3" successfully created. Volume group "centos" successfully extended [root@bigops-4 ~]# lvextend -L +400G /dev/centos/root /dev/vda3 ---扩容文件系统vda3 到根目录 Insufficient free space: 102400 extents needed, but only 102399 available [root@bigops-4 ~]# lvextend -L +399G /dev/centos/root /dev/vda3 Size of logical volume centos/root changed from 50.00 GiB (12800 extents) to 449.00 GiB (114944 extents). Logical volume centos/root successfully resized. [root@bigops-4 ~]#
[root@bigops-4 ~]# [root@bigops-4 ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/centos-root 50G 1.4G 49G 3% / devtmpfs 3.9G 0 3.9G 0% /dev tmpfs 3.9G 0 3.9G 0% /dev/shm tmpfs 3.9G 8.5M 3.9G 1% /run tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup /dev/vda1 1014M 142M 873M 14% /boot /dev/mapper/centos-home 42G 33M 42G 1% /home tmpfs 783M 0 783M 0% /run/user/0 [root@bigops-4 ~]# [root@bigops-4 ~]# xfs_growfs /dev/centos/root #####扩展文件系统 meta-data=/dev/mapper/centos-root isize=512 agcount=4, agsize=3276800 blks = sectsz=512 attr=2, projid32bit=1 = crc=1 finobt=0 spinodes=0 data = bsize=4096 blocks=13107200, imaxpct=25 = sunit=0 swidth=0 blks naming =version 2 bsize=4096 ascii-ci=0 ftype=1 log =internal bsize=4096 blocks=6400, version=2 = sectsz=512 sunit=0 blks, lazy-count=1 realtime =none extsz=4096 blocks=0, rtextents=0 data blocks changed from 13107200 to 117702656 [root@bigops-4 ~]# [root@bigops-4 ~]# df -h #####验证扩容是否成功 Filesystem Size Used Avail Use% Mounted on /dev/mapper/centos-root 449G 1.4G 448G 1% / devtmpfs 3.9G 0 3.9G 0% /dev tmpfs 3.9G 0 3.9G 0% /dev/shm tmpfs 3.9G 8.5M 3.9G 1% /run tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup /dev/vda1 1014M 142M 873M 14% /boot /dev/mapper/centos-home 42G 33M 42G 1% /home tmpfs 783M 0 783M 0% /run/user/0 [root@bigops-4 ~]#
扩容完成。
