[root@demo ~]# service ngxin stop
Redirecting to /bin/systemctl stop ngxin.service
Failed to stop ngxin.service: Unit ngxin.service not loaded.
[root@demo ~]# service nginx stop
Stopping nginx (via systemctl): [ OK ]
[root@demo ~]# umount /dev/vdb1
umount: /data: target is busy.
(In some cases useful info about processes that use
the device is found by lsof(8) or fuser(1))
[root@demo ~]# service mysqld stop
Shutting down MySQL.. [ OK ]
[root@demo ~]# umount /dev/vdb1
[root@demo ~]# df -h
Filesystem Size Used Avail Use% Mounted on
devtmpfs 3.9G 0 3.9G 0% /dev
tmpfs 3.9G 0 3.9G 0% /dev/shm
tmpfs 3.9G 500K 3.9G 1% /run
tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup
/dev/vda1 40G 8.3G 29G 23% /
tmpfs 783M 0 783M 0% /run/user/0
[root@demo ~]# fdisk /dev/vdb
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): d
Selected partition 1
Partition 1 is deleted
Command (m for help): n
Partition type:
p primary (0 primary, 0 extended, 4 free)
e extended
Select (default p):
Using default response p
Partition number (1-4, default 1):
First sector (2048-230686719, default 2048):
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-230686719, default 230686719):
Using default value 230686719
Partition 1 of type Linux and of size 110 GiB is set
Command (m for help): wq
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
[root@demo ~]# e2fsck -f /dev/vdb1
e2fsck 1.42.9 (28-Dec-2013)
/dev/vdb1 is mounted.
e2fsck: Cannot continue, aborting.
[root@demo ~]# df -h
Filesystem Size Used Avail Use% Mounted on
devtmpfs 3.9G 0 3.9G 0% /dev
tmpfs 3.9G 0 3.9G 0% /dev/shm
tmpfs 3.9G 500K 3.9G 1% /run
tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup
/dev/vda1 40G 8.3G 29G 23% /
tmpfs 783M 0 783M 0% /run/user/0
/dev/vdb1 69G 59G 6.4G 91% /data
[root@demo ~]# umount /dev/vdb1
[root@demo ~]# df -h
Filesystem Size Used Avail Use% Mounted on
devtmpfs 3.9G 0 3.9G 0% /dev
tmpfs 3.9G 0 3.9G 0% /dev/shm
tmpfs 3.9G 500K 3.9G 1% /run
tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup
/dev/vda1 40G 8.3G 29G 23% /
tmpfs 783M 0 783M 0% /run/user/0
[root@demo ~]# e2fsck -f /dev/vdb1
e2fsck 1.42.9 (28-Dec-2013)
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
/dev/vdb1: 84876/4587520 files (0.9% non-contiguous), 15768264/18349824 blocks
[root@demo ~]# resize2fs /dev/vdb1
resize2fs 1.42.9 (28-Dec-2013)
Resizing the filesystem on /dev/vdb1 to 28835584 (4k) blocks.
The filesystem on /dev/vdb1 is now 28835584 blocks long.
[root@demo ~]# df -h
Filesystem Size Used Avail Use% Mounted on
devtmpfs 3.9G 0 3.9G 0% /dev
tmpfs 3.9G 0 3.9G 0% /dev/shm
tmpfs 3.9G 500K 3.9G 1% /run
tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup
/dev/vda1 40G 8.3G 29G 23% /
tmpfs 783M 0 783M 0% /run/user/0
[root@demo ~]# mount /dev/vdb1 /resizetest
mount: mount point /resizetest does not exist
[root@demo ~]# df -h
Filesystem Size Used Avail Use% Mounted on
devtmpfs 3.9G 0 3.9G 0% /dev
tmpfs 3.9G 0 3.9G 0% /dev/shm
tmpfs 3.9G 500K 3.9G 1% /run
tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup
/dev/vda1 40G 8.3G 29G 23% /
tmpfs 783M 0 783M 0% /run/user/0
[root@demo ~]# mount /dev/vdb1
[root@demo ~]# df -h
Filesystem Size Used Avail Use% Mounted on
devtmpfs 3.9G 0 3.9G 0% /dev
tmpfs 3.9G 0 3.9G 0% /dev/shm
tmpfs 3.9G 500K 3.9G 1% /run
tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup
/dev/vda1 40G 8.3G 29G 23% /
tmpfs 783M 0 783M 0% /run/user/0
/dev/vdb1 109G 59G 44G 58% /data
[root@demo ~]# service nginx restart
lsblk 查看分区和磁盘
df -h 查看空间使用情况
fdisk -l 分区工具查看分区信息
cfdisk /dev/sda 查看分区
blkid 查看硬盘label（别名）
du -sh ./* 统计当前目录各文件夹大小
free -h 查看内存大小
cat /proc/cpuinfo| grep "cpu cores"| uniq 查看cpu核心数
cat /proc/cpuinfo| grep "physical id"|uniq| wc -l 查看物理cpu个数
cat /proc/cpuinfo| grep "processor"| wc -l 查看逻辑cpu的个数
