CentOS7.9 扩容 调整/Home分区大小
阿里云服务器可以参考: https://help.aliyun.com/document_detail/25451.html
CentOS7刚安装时如果选择默认分区设置,则根目录/的分区大小只有50G,swap分区与内存大小一致,其余所有的空间都会放在/home分区下。比如总共200G的磁盘空间情况下,默认分区home分区会有144G。
1.首先查看磁盘分区的默认初始情况:
[root@localhost ~]# df -h 文件系统 容量 已用 可用 已用% 挂载点 devtmpfs 16G 0 16G 0% /dev tmpfs 16G 0 16G 0% /dev/shm tmpfs 16G 17M 16G 1% /run tmpfs 16G 0 16G 0% /sys/fs/cgroup /dev/mapper/centos-root 50G 2.9G 48G 6% / /dev/vda1 1014M 181M 834M 18% /boot /dev/mapper/centos-home 142G 33M 142G 1% /home tmpfs 2.6G 0 2.6G 0% /run/user/0
可以用 df -Th 查看服务器文件类型, 这里是 xfs文件系统
2.使用 lsblk 命令,列出所有可用块设备的信息,而且还能显示他们之间的依赖关系,但是它不会列出RAM盘的信息。块设备有硬盘,闪存盘,cd-ROM等
[root@localhost ~]# lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sr0 11:0 1 973M 0 rom vda 252:0 0 200G 0 disk ├─vda1 252:1 0 1G 0 part /boot └─vda2 252:2 0 199G 0 part ├─centos-root 253:0 0 50G 0 lvm / ├─centos-swap 253:1 0 7.8G 0 lvm [SWAP] └─centos-home 253:2 0 141.2G 0 lvm
3.卸载/home分区,此时如果/home分区有已经正在执行的程序需要先停止正在执行的程序,然后再卸载
[root@localhost ~]# umount /home [root@localhost ~]# lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sr0 11:0 1 973M 0 rom vda 252:0 0 200G 0 disk ├─vda1 252:1 0 1G 0 part /boot └─vda2 252:2 0 199G 0 part ├─centos-root 253:0 0 50G 0 lvm / ├─centos-swap 253:1 0 7.8G 0 lvm [SWAP]
4.删除逻辑/Home卷
[root@localhost ~]# lvremove /dev/mapper/centos-home Do you really want to remove active logical volume centos/home? [y/n]: y Logical volume "home" successfully removed [root@localhost ~]# lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sr0 11:0 1 973M 0 rom vda 252:0 0 200G 0 disk ├─vda1 252:1 0 1G 0 part /boot └─vda2 252:2 0 199G 0 part ├─centos-root 253:0 0 50G 0 lvm / └─centos-swap 253:1 0 7.8G 0 lvm [SWAP]
5.重新创建逻辑home卷,并设置分区大小,我这里设置10G
[root@localhost ~]# lvcreate -L 10G -n home centos WARNING: xfs signature detected on /dev/centos/home at offset 0. Wipe it? [y/n]: y Wiping xfs signature on /dev/centos/home. Logical volume "home" created.
6.格式化home分区
[root@localhost ~]# mkfs.xfs /dev/mapper/centos-home meta-data=/dev/mapper/centos-home isize=512 agcount=4, agsize=655360 blks = sectsz=512 attr=2, projid32bit=1 = crc=1 finobt=0, sparse=0 data = bsize=4096 blocks=2621440, imaxpct=25 = sunit=0 swidth=0 blks naming =version 2 bsize=4096 ascii-ci=0 ftype=1 log =internal log bsize=4096 blocks=2560, version=2 = sectsz=512 sunit=0 blks, lazy-count=1 realtime =none extsz=4096 blocks=0, rtextents=0
7.挂载home分区
[root@localhost ~]# mount /dev/mapper/centos-home /home
8.将home分区压缩下来的空间 全部放到根分区下
[root@localhost ~]# lvextend -l +100%FREE /dev/mapper/centos-root Size of logical volume centos/root changed from 50.00 GiB (12800 extents) to <181.25 GiB (46399 extents). Logical volume centos/root successfully resized.
9.重新查看磁盘分区信息
[root@localhost ~]# df -h 文件系统 容量 已用 可用 已用% 挂载点 devtmpfs 16G 0 16G 0% /dev tmpfs 16G 0 16G 0% /dev/shm tmpfs 16G 17M 16G 1% /run tmpfs 16G 0 16G 0% /sys/fs/cgroup /dev/mapper/centos-root 50G 2.9G 48G 6% / /dev/vda1 1014M 181M 834M 18% /boot tmpfs 2.6G 0 2.6G 0% /run/user/0 /dev/mapper/centos-home 10G 33M 10G 1% /home
最后执行扩容命令即可
type xfs_growfs || yum install -y xfsprogs xfs_growfs /dev/mapper/centos-root