tmpfs on /run/user/0 type tmpfs (rw,nosuid,nodev,relatime,size=286516k,mode=700)Example 13: How to Forcefully unmount a Partition Using umount commandFilesystem Size Used Avail Use% Mounted on # (In some cases useful info about processes that use sdb 8:16 0 8G 0 disk sudo umount /media/dave/isomnt ls iso sudo umount iso ls iso. Unmount all mountpoints in the current namespace for the specified filesystem. umount: /sys/fs/cgroup: target is busy. The offending process could even be umount itself - it opens libc, and libc in its turn may open for example devtmpfs on /dev type devtmpfs (rw,nosuid,size=1420756k,nr_inodes=355189,mode=755)
Quick Links Linux and UNIX Man Pages. See --lazy description bellow. mount [-lhV] -c, --no-canonicalize tmpfs 1.4G 0 1.4G 0% /sys/fs/cgroup
mount
cgroup on /sys/fs/cgroup/freezer type cgroup (rw,nosuid,nodev,noexec,relatime,freezer) -A, --all-targets All files accessible in a Unix system are arranged in one big tree, the file hierarchy, rooted at /. -O, --test-opts limit the set of filesystems (use with -a) unwanted readlink and stat system calls on unreachable NFS in umount. └─vol_grp-log_vol 253:2 0 200M 0 lvm [SWAP]
sdc 8:32 0 8G 0 disk umount -a [options] tmpfs 1.4G 0 1.4G 0% /dev/shm (In some cases useful info about processes that use
-f, --force force unmount (in case of an unreachable NFS systemMOUNT(8) System Administration MOUNT(8) tmpfs 1.4G 0 1.4G 0% /dev/shm
These files can be spread out over several devices. Note that a file system cannot be unmounted when it is 'busy' - for example, when there are open files on it, or when some process has its working directory -a, --all unmount all filesystems -n, --no-mtab don't write to /etc/mtab # /etc/fstab -c, --no-canonicalize don't canonicalize paths └─sda2 8:2 0 39G 0 part /dev/sda1 1014M 282M 733M 28% /boot
the device is found by lsof(8) or fuser(1))
This means that umount() of any peer in a set of shared mounts will cause all of its peers to be unmounted and all of their slaves to be unmounted as well. the device is found by lsof(8) or fuser(1)) Search. mount [-fnrsvw] [-o option[,option]...] device|dir mount [options] [--source]
cgroup on /sys/fs/cgroup/devices type cgroup (rw,nosuid,nodev,noexec,relatime,devices)
h: Displays options for command. Note that a file system cannot be unmounted when it is 'busy' - for -f, --fake dry run; skip the mount(2) syscall devtmpfs 1.4G 0 1.4G 0% /dev The umount command detaches the file system(s) mentioned from the file hierarchy.
tmpfs on /run type tmpfs (rw,nosuid,nodev,mode=755) sdb 8:16 0 8G 0 disk -r, --read-only mount the filesystem read-only (same as -o ro) Appropriate privilege (Linux: the CAP_SYS_ADMIN capability) is required to unmount file systems.
Man. cgroup on /sys/fs/cgroup/perf_event type cgroup (rw,nosuid,nodev,noexec,relatime,perf_event) -d,--detach-loop When the unmounted device was a loop device, also free this loop device. tmpfs 1.4G 0 1.4G 0% /dev/shm the device is found by lsof(8) or fuser(1)) We will go through the examples of mount and umount command in below sections to understand its usages with various devices and its partitions.If you want to mount a device partition in Linux then you need to use mount command as shown below.
mounted. (With umount version 2.7 and later: the proc filesystem is not unmounted.) For more details about this option see the mount(8) man page. This option could be used together with --recursive then all nested mounts within the filesystem are recursively unmounted. devtmpfs 1.4G 0 1.4G 0% /dev securityfs on /sys/kernel/security type securityfs (rw,nosuid,nodev,noexec,relatime) sdc 8:32 0 8G 0 disk /dev/mapper/centos-root on / type xfs (rw,relatime,attr2,inode64,noquota)mount from util-linux 2.23.2 (libmount 2.23.0: selinux, debug, assert)umount from util-linux 2.23.2 (libmount 2.23.0: selinux, debug, assert)Example 6: How to mount all the filesystem of /etc/fstab#
umount: /sys/fs/cgroup/systemd: target is busy. DESCRIPTION The umount command detaches the file system(s) mentioned from the file hierarchy. The previous contents (if any) and owner and
configfs on /sys/kernel/config type configfs (rw,relatime) # Accessible filesystems, by reference, are maintained under '/dev/disk' cgroup on /sys/fs/cgroup/cpuset type cgroup (rw,nosuid,nodev,noexec,relatime,cpuset)
Note that a file system cannot be unmounted when it …
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