Linux磁盘扩容 df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/centos-root 197G 2.3G 195G 2% / devtmpfs 7.8G 0 7.8G 0% /dev tmpfs 7.8G 0 7.8G 0% /dev/shm tmpfs 7.8G 8.5M 7.8G 1% /run tmpfs