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findmnt命令详解

时间：2023-01-15 10:45:17浏览次数：40  
标签：relatime rw findmnt sys 命令 详解 cgroup nosuid nodev

findmnt主要是用来查看文件系统信息的工具

数据来源: /etc/fstab /etc/mtab /proc/self/mountinfo

帮助信息:

➜  ~ findmnt --help

Usage:
 findmnt [options]
 findmnt [options] <device> | <mountpoint>
 findmnt [options] <device> <mountpoint>
 findmnt [options] [--source <device>] [--target <path> | --mountpoint <dir>]

Find a (mounted) filesystem.

选项：
 -s, --fstab            search in static table of filesystems
 -m, --mtab             search in table of mounted filesystems
 -k, --kernel           search in kernel table of mounted
                          filesystems (default)

 -p, --poll[=<list>]    monitor changes in table of mounted filesystems
 -w, --timeout <num>    upper limit in milliseconds that --poll will block

 -A, --all              disable all built-in filters, print all filesystems
 -a, --ascii            use ASCII chars for tree formatting
 -b, --bytes            print sizes in bytes rather than in human readable format
 -C, --nocanonicalize   don't canonicalize when comparing paths
 -c, --canonicalize     canonicalize printed paths
 -D, --df               imitate the output of df(1)
 -d, --direction <word> direction of search, 'forward' or 'backward'
 -e, --evaluate         convert tags (LABEL,UUID,PARTUUID,PARTLABEL) 
                          to device names
 -F, --tab-file <path>  alternative file for -s, -m or -k options
 -f, --first-only       print the first found filesystem only
 -i, --invert           invert the sense of matching
 -J, --json             use JSON output format
 -l, --list             use list format output
 -N, --task <tid>       use alternative namespace (/proc/<tid>/mountinfo file)
 -n, --noheadings       don't print column headings
 -O, --options <list>   limit the set of filesystems by mount options
 -o, --output <list>    the output columns to be shown
 -P, --pairs            use key="value" output format
 -R, --submounts        print all submounts for the matching filesystems
 -r, --raw              use raw output format
 -S, --source <string>  the device to mount (by name, maj:min, 
                          LABEL=, UUID=, PARTUUID=, PARTLABEL=)
 -T, --target <path>    the path to the filesystem to use
 -M, --mountpoint <dir> the mountpoint directory
 -t, --types <list>     limit the set of filesystems by FS types
 -U, --uniq             ignore filesystems with duplicate target
 -u, --notruncate       don't truncate text in columns
 -v, --nofsroot         don't print [/dir] for bind or btrfs mounts

 -h, --help     display this help and exit
 -V, --version  output version information and exit

Available columns:
      SOURCE  source device
      TARGET  mountpoint
      FSTYPE  filesystem type
     OPTIONS  all mount options
 VFS-OPTIONS  VFS specific mount options
  FS-OPTIONS  FS specific mount options
       LABEL  filesystem label
        UUID  filesystem UUID
   PARTLABEL  partition label
    PARTUUID  partition UUID
     MAJ:MIN  major:minor device number
      ACTION  action detected by --poll
  OLD-TARGET  old mountpoint saved by --poll
 OLD-OPTIONS  old mount options saved by --poll
        SIZE  filesystem size
       AVAIL  filesystem size available
        USED  filesystem size used
        USE%  filesystem use percentage
      FSROOT  filesystem root
         TID  task ID
          ID  mount ID
  OPT-FIELDS  optional mount fields
 PROPAGATION  VFS propagation flags
        FREQ  dump(8) period in days [fstab only]
      PASSNO  pass number on parallel fsck(8) [fstab only]

For more details see findmnt(8).

-s, --fstab: 从/etc/fstab读取静态信息

➜  ~ findmnt -s
TARGET SOURCE                                    FSTYPE OPTIONS
/      UUID=6b5618d0-a2b0-41f3-a3a5-9eb5a524b0a8 ext4   errors=remount-ro,noatime,discard
/home  UUID=53842090-4ad6-4472-ad35-53b4d7b33bf8 ext4   defaults,noatime,discard
none   UUID=382e4b22-503e-4911-bf2f-1167af3f3cda swap   sw

-m, --mtab: 以表格形式输出已挂载的文件系统

➜  ~ findmnt -m
TARGET                          SOURCE      FSTYPE        OPTIONS
/sys                            sysfs       sysfs         rw,nosuid,nodev,noexec,relatime
/proc                           proc        proc          rw,nosuid,nodev,noexec,relatime
/dev                            udev        devtmpfs      rw,nosuid,relatime,size=16418608k,nr_inodes=4104652,mode=755
/dev/pts                        devpts      devpts        rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000
/run                            tmpfs       tmpfs         rw,nosuid,noexec,relatime,size=3290488k,mode=755
/                               /dev/sdb1   ext4          rw,noatime,discard,errors=remount-ro,data=ordered
/sys/kernel/security            securityfs  securityfs    rw,nosuid,nodev,noexec,relatime
/dev/shm                        tmpfs       tmpfs         rw,nosuid,nodev
/run/lock                       tmpfs       tmpfs         rw,nosuid,nodev,noexec,relatime,size=5120k
/sys/fs/cgroup                  tmpfs       tmpfs         rw,mode=755
/sys/fs/cgroup/systemd          cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,xattr,release_agent=/lib/systemd/systemd-cgroups-ag
/sys/fs/pstore                  pstore      pstore        rw,nosuid,nodev,noexec,relatime
/sys/fs/cgroup/cpu,cpuacct      cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,cpu,cpuacct
/sys/fs/cgroup/freezer          cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,freezer
/sys/fs/cgroup/perf_event       cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,perf_event,release_agent=/run/cgmanager/agents/cgm-
/sys/fs/cgroup/net_cls,net_prio cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,net_cls,net_prio
/sys/fs/cgroup/devices          cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,devices
/sys/fs/cgroup/memory           cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,memory
/sys/fs/cgroup/blkio            cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,blkio
/sys/fs/cgroup/pids             cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,pids,release_agent=/run/cgmanager/agents/cgm-releas
/sys/fs/cgroup/rdma             cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,rdma,release_agent=/run/cgmanager/agents/cgm-releas
/sys/fs/cgroup/hugetlb          cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,hugetlb,release_agent=/run/cgmanager/agents/cgm-rel
/sys/fs/cgroup/cpuset           cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,cpuset,clone_children
/proc/sys/fs/binfmt_misc        systemd-1   autofs        rw,relatime,fd=34,pgrp=1,timeout=0,minproto=5,maxproto=5,direct,pipe_ino=16766
/dev/mqueue                     mqueue      mqueue        rw,relatime
/sys/kernel/debug               debugfs     debugfs       rw,relatime
/dev/hugepages                  hugetlbfs   hugetlbfs     rw,relatime,pagesize=2M
/sys/kernel/config              configfs    configfs      rw,relatime
/sys/fs/fuse/connections        fusectl     fusectl       rw,relatime
/snap/kata-containers/352       /dev/loop2  squashfs      ro,nodev,relatime
/snap/core/6818                 /dev/loop1  squashfs      ro,nodev,relatime
/snap/core/6964                 /dev/loop0  squashfs      ro,nodev,relatime
/snap/kata-containers/288       /dev/loop4  squashfs      ro,nodev,relatime
/snap/core/6673                 /dev/loop3  squashfs      ro,nodev,relatime
/home                           /dev/sdb2   ext4          rw,noatime,discard,data=ordered
/proc/sys/fs/binfmt_misc        binfmt_misc binfmt_misc   rw,relatime
/run/cgmanager/fs               cgmfs       tmpfs         rw,relatime,size=100k,mode=755
/run/user/1000                  tmpfs       tmpfs         rw,nosuid,nodev,relatime,size=3290488k,mode=700,uid=1000,gid=1000
/run/user/1000/gvfs             gvfsd-fuse  fuse.gvfsd-fu rw,nosuid,nodev,relatime,user_id=1000,group_id=1000

-k, --kernel: 从内核读取已挂载的文件系统(default)

➜  ~ findmnt -k
TARGET                                SOURCE      FSTYPE        OPTIONS
/                                     /dev/sdb1   ext4          rw,noatime,discard,errors=remount-ro,data=ordered
├─/sys                                sysfs       sysfs         rw,nosuid,nodev,noexec,relatime
│ ├─/sys/kernel/security              securityfs  securityfs    rw,nosuid,nodev,noexec,relatime
│ ├─/sys/fs/cgroup                    tmpfs       tmpfs         rw,mode=755
│ │ ├─/sys/fs/cgroup/systemd          cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,xattr,release_agent=/lib/systemd/systemd-cgro
│ │ ├─/sys/fs/cgroup/cpu,cpuacct      cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,cpu,cpuacct
│ │ ├─/sys/fs/cgroup/freezer          cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,freezer
│ │ ├─/sys/fs/cgroup/perf_event       cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,perf_event,release_agent=/run/cgmanager/agent
│ │ ├─/sys/fs/cgroup/net_cls,net_prio cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,net_cls,net_prio
│ │ ├─/sys/fs/cgroup/devices          cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,devices
│ │ ├─/sys/fs/cgroup/memory           cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,memory
│ │ ├─/sys/fs/cgroup/blkio            cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,blkio
│ │ ├─/sys/fs/cgroup/pids             cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,pids,release_agent=/run/cgmanager/agents/cgm-
│ │ ├─/sys/fs/cgroup/rdma             cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,rdma,release_agent=/run/cgmanager/agents/cgm-
│ │ ├─/sys/fs/cgroup/hugetlb          cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,hugetlb,release_agent=/run/cgmanager/agents/c
│ │ └─/sys/fs/cgroup/cpuset           cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,cpuset,clone_children
│ ├─/sys/fs/pstore                    pstore      pstore        rw,nosuid,nodev,noexec,relatime
│ ├─/sys/kernel/debug                 debugfs     debugfs       rw,relatime
│ ├─/sys/kernel/config                configfs    configfs      rw,relatime
│ └─/sys/fs/fuse/connections          fusectl     fusectl       rw,relatime
├─/proc                               proc        proc          rw,nosuid,nodev,noexec,relatime
│ └─/proc/sys/fs/binfmt_misc          systemd-1   autofs        rw,relatime,fd=34,pgrp=1,timeout=0,minproto=5,maxproto=5,direct,pipe_ino=1676
│   └─/proc/sys/fs/binfmt_misc        binfmt_misc binfmt_misc   rw,relatime
├─/dev                                udev        devtmpfs      rw,nosuid,relatime,size=16418608k,nr_inodes=4104652,mode=755
│ ├─/dev/pts                          devpts      devpts        rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000
│ ├─/dev/shm                          tmpfs       tmpfs         rw,nosuid,nodev
│ ├─/dev/mqueue                       mqueue      mqueue        rw,relatime
│ └─/dev/hugepages                    hugetlbfs   hugetlbfs     rw,relatime,pagesize=2M
├─/run                                tmpfs       tmpfs         rw,nosuid,noexec,relatime,size=3290488k,mode=755
│ ├─/run/lock                         tmpfs       tmpfs         rw,nosuid,nodev,noexec,relatime,size=5120k
│ ├─/run/cgmanager/fs                 cgmfs       tmpfs         rw,relatime,size=100k,mode=755
│ └─/run/user/1000                    tmpfs       tmpfs         rw,nosuid,nodev,relatime,size=3290488k,mode=700,uid=1000,gid=1000
│   └─/run/user/1000/gvfs             gvfsd-fuse  fuse.gvfsd-fu rw,nosuid,nodev,relatime,user_id=1000,group_id=1000
├─/snap/core/6818                     /dev/loop1  squashfs      ro,nodev,relatime
├─/snap/core/6964                     /dev/loop0  squashfs      ro,nodev,relatime
├─/snap/kata-containers/352           /dev/loop2  squashfs      ro,nodev,relatime
├─/snap/kata-containers/288           /dev/loop4  squashfs      ro,nodev,relatime
├─/snap/core/6673                     /dev/loop3  squashfs      ro,nodev,relatime
└─/home                               /dev/sdb2   ext4          rw,noatime,discard,data=ordered

-p, --poll[=]: 监控文件系统挂载的变化

➜  ~ findmnt -p
ACTION     TARGET                 SOURCE    FSTYPE  OPTIONS
mount      /media/wanglin/Volume2 /dev/sdc1 fuseblk rw,nosuid,nodev,relatime,user_id=0,group_id=0,default_permissions,allow_other,blksize=409
ACTION     TARGET                 SOURCE    FSTYPE  OPTIONS
umount     /media/wanglin/Volume2 /dev/sdc1 fuseblk rw,nosuid,nodev,relatime,user_id=0,group_id=0,default_permissions,allow_other,blksize=409

-w, --timeout : 与-p同时使用指定监控时长.

-A, --all: 不使用内置过滤器,打印所有文件系统

➜  ~ findmnt -A
TARGET                                SOURCE      FSTYPE        OPTIONS
/                                     /dev/sdb1   ext4          rw,noatime,discard,errors=remount-ro,data=ordered
├─/sys                                sysfs       sysfs         rw,nosuid,nodev,noexec,relatime
│ ├─/sys/kernel/security              securityfs  securityfs    rw,nosuid,nodev,noexec,relatime
│ ├─/sys/fs/cgroup                    tmpfs       tmpfs         rw,mode=755
│ │ ├─/sys/fs/cgroup/systemd          cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,xattr,release_agent=/lib/systemd/systemd-cgro
│ │ ├─/sys/fs/cgroup/cpu,cpuacct      cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,cpu,cpuacct
│ │ ├─/sys/fs/cgroup/freezer          cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,freezer
│ │ ├─/sys/fs/cgroup/perf_event       cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,perf_event,release_agent=/run/cgmanager/agent
│ │ ├─/sys/fs/cgroup/net_cls,net_prio cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,net_cls,net_prio
│ │ ├─/sys/fs/cgroup/devices          cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,devices
│ │ ├─/sys/fs/cgroup/memory           cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,memory
│ │ ├─/sys/fs/cgroup/blkio            cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,blkio
│ │ ├─/sys/fs/cgroup/pids             cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,pids,release_agent=/run/cgmanager/agents/cgm-
│ │ ├─/sys/fs/cgroup/rdma             cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,rdma,release_agent=/run/cgmanager/agents/cgm-
│ │ ├─/sys/fs/cgroup/hugetlb          cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,hugetlb,release_agent=/run/cgmanager/agents/c
│ │ └─/sys/fs/cgroup/cpuset           cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,cpuset,clone_children
│ ├─/sys/fs/pstore                    pstore      pstore        rw,nosuid,nodev,noexec,relatime
│ ├─/sys/kernel/debug                 debugfs     debugfs       rw,relatime
│ ├─/sys/kernel/config                configfs    configfs      rw,relatime
│ └─/sys/fs/fuse/connections          fusectl     fusectl       rw,relatime
├─/proc                               proc        proc          rw,nosuid,nodev,noexec,relatime
│ └─/proc/sys/fs/binfmt_misc          systemd-1   autofs        rw,relatime,fd=34,pgrp=1,timeout=0,minproto=5,maxproto=5,direct,pipe_ino=1676
│   └─/proc/sys/fs/binfmt_misc        binfmt_misc binfmt_misc   rw,relatime
├─/dev                                udev        devtmpfs      rw,nosuid,relatime,size=16418608k,nr_inodes=4104652,mode=755
│ ├─/dev/pts                          devpts      devpts        rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000
│ ├─/dev/shm                          tmpfs       tmpfs         rw,nosuid,nodev
│ ├─/dev/mqueue                       mqueue      mqueue        rw,relatime
│ └─/dev/hugepages                    hugetlbfs   hugetlbfs     rw,relatime,pagesize=2M
├─/run                                tmpfs       tmpfs         rw,nosuid,noexec,relatime,size=3290488k,mode=755
│ ├─/run/lock                         tmpfs       tmpfs         rw,nosuid,nodev,noexec,relatime,size=5120k
│ ├─/run/cgmanager/fs                 cgmfs       tmpfs         rw,relatime,size=100k,mode=755
│ └─/run/user/1000                    tmpfs       tmpfs         rw,nosuid,nodev,relatime,size=3290488k,mode=700,uid=1000,gid=1000
│   └─/run/user/1000/gvfs             gvfsd-fuse  fuse.gvfsd-fu rw,nosuid,nodev,relatime,user_id=1000,group_id=1000
├─/snap/core/6818                     /dev/loop1  squashfs      ro,nodev,relatime
├─/snap/core/6964                     /dev/loop0  squashfs      ro,nodev,relatime
├─/snap/kata-containers/352           /dev/loop2  squashfs      ro,nodev,relatime
├─/snap/kata-containers/288           /dev/loop4  squashfs      ro,nodev,relatime
├─/snap/core/6673                     /dev/loop3  squashfs      ro,nodev,relatime
└─/home                               /dev/sdb2   ext4          rw,noatime,discard,data=ordered

-a, --ascii: 字符使用ascii码输出

➜  ~ findmnt -a
TARGET                                SOURCE      FSTYPE        OPTIONS
/                                     /dev/sdb1   ext4          rw,noatime,discard,errors=remount-ro,data=ordered
|-/sys                                sysfs       sysfs         rw,nosuid,nodev,noexec,relatime
| |-/sys/kernel/security              securityfs  securityfs    rw,nosuid,nodev,noexec,relatime
| |-/sys/fs/cgroup                    tmpfs       tmpfs         rw,mode=755
| | |-/sys/fs/cgroup/systemd          cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,xattr,release_agent=/lib/systemd/systemd-cgro
| | |-/sys/fs/cgroup/cpu,cpuacct      cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,cpu,cpuacct
| | |-/sys/fs/cgroup/freezer          cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,freezer
| | |-/sys/fs/cgroup/perf_event       cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,perf_event,release_agent=/run/cgmanager/agent
| | |-/sys/fs/cgroup/net_cls,net_prio cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,net_cls,net_prio
| | |-/sys/fs/cgroup/devices          cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,devices
| | |-/sys/fs/cgroup/memory           cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,memory
| | |-/sys/fs/cgroup/blkio            cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,blkio
| | |-/sys/fs/cgroup/pids             cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,pids,release_agent=/run/cgmanager/agents/cgm-
| | |-/sys/fs/cgroup/rdma             cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,rdma,release_agent=/run/cgmanager/agents/cgm-
| | |-/sys/fs/cgroup/hugetlb          cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,hugetlb,release_agent=/run/cgmanager/agents/c
| | `-/sys/fs/cgroup/cpuset           cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,cpuset,clone_children
| |-/sys/fs/pstore                    pstore      pstore        rw,nosuid,nodev,noexec,relatime
| |-/sys/kernel/debug                 debugfs     debugfs       rw,relatime
| |-/sys/kernel/config                configfs    configfs      rw,relatime
| `-/sys/fs/fuse/connections          fusectl     fusectl       rw,relatime
|-/proc                               proc        proc          rw,nosuid,nodev,noexec,relatime
| `-/proc/sys/fs/binfmt_misc          systemd-1   autofs        rw,relatime,fd=34,pgrp=1,timeout=0,minproto=5,maxproto=5,direct,pipe_ino=1676
|   `-/proc/sys/fs/binfmt_misc        binfmt_misc binfmt_misc   rw,relatime
|-/dev                                udev        devtmpfs      rw,nosuid,relatime,size=16418608k,nr_inodes=4104652,mode=755
| |-/dev/pts                          devpts      devpts        rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000
| |-/dev/shm                          tmpfs       tmpfs         rw,nosuid,nodev
| |-/dev/mqueue                       mqueue      mqueue        rw,relatime
| `-/dev/hugepages                    hugetlbfs   hugetlbfs     rw,relatime,pagesize=2M
|-/run                                tmpfs       tmpfs         rw,nosuid,noexec,relatime,size=3290488k,mode=755
| |-/run/lock                         tmpfs       tmpfs         rw,nosuid,nodev,noexec,relatime,size=5120k
| |-/run/cgmanager/fs                 cgmfs       tmpfs         rw,relatime,size=100k,mode=755
| `-/run/user/1000                    tmpfs       tmpfs         rw,nosuid,nodev,relatime,size=3290488k,mode=700,uid=1000,gid=1000
|   `-/run/user/1000/gvfs             gvfsd-fuse  fuse.gvfsd-fu rw,nosuid,nodev,relatime,user_id=1000,group_id=1000
|-/snap/core/6818                     /dev/loop1  squashfs      ro,nodev,relatime
|-/snap/core/6964                     /dev/loop0  squashfs      ro,nodev,relatime
|-/snap/kata-containers/352           /dev/loop2  squashfs      ro,nodev,relatime
|-/snap/kata-containers/288           /dev/loop4  squashfs      ro,nodev,relatime
|-/snap/core/6673                     /dev/loop3  squashfs      ro,nodev,relatime
`-/home                               /dev/sdb2   ext4          rw,noatime,discard,data=ordered

-b, --bytes: size使用bytes输出

-C, --nocanonicalize: 不规范打印

-c, --canonicalize: 规范打印

-C -c看不出来区别

-D, --df: 模仿df输出的样式打印

➜  ~ findmnt -D
SOURCE     FSTYPE            SIZE   USED  AVAIL USE% TARGET
udev       devtmpfs         15.7G      0  15.7G   0% /dev
tmpfs      tmpfs             3.1G  13.7M   3.1G   0% /run
/dev/sdb1  ext4             93.8G    49G    40G  52% /
tmpfs      tmpfs            15.7G 195.8M  15.5G   1% /dev/shm
tmpfs      tmpfs               5M     4K     5M   0% /run/lock
tmpfs      tmpfs            15.7G      0  15.7G   0% /sys/fs/cgroup
/dev/loop2 squashfs         69.8M  69.8M      0 100% /snap/kata-containers/352
/dev/loop1 squashfs         89.5M  89.5M      0 100% /snap/core/6818
/dev/loop0 squashfs         88.5M  88.5M      0 100% /snap/core/6964
/dev/loop4 squashfs         55.9M  55.9M      0 100% /snap/kata-containers/288
/dev/loop3 squashfs         89.3M  89.3M      0 100% /snap/core/6673
/dev/sdb2  ext4            366.1G 146.9G 200.6G  40% /home
cgmfs      tmpfs             100K      0   100K   0% /run/cgmanager/fs
tmpfs      tmpfs             3.1G    68K   3.1G   0% /run/user/1000
gvfsd-fuse fuse.gvfsd-fuse      0      0      0    - /run/user/1000/gvfs

-d, --direction 检查方向,word 值: forward / backward

两个word使用上看不出区别

-e, --evaluate: 把tags(LABEL,UUID,PARTUUID,PARTLABEL)转换成设备名

-F, --tab-file : 选择文件 -s,-m or -k 选项的

-f, --first-only: 打印第一个发现的文件系统, findmnt的第一行文件系统

-i, --invert: 从指定位置反向打印,没啥用

-J, --json: json格式输出

-l, --list: 列表格式输出

-N, --task : 打印指定pid的namespace的文件系统挂载信息,即/proc//mountinfo 的信息输出

➜  ~ findmnt -N 1
TARGET                                SOURCE      FSTYPE        OPTIONS
/                                     /dev/sdb1   ext4          rw,noatime,discard,errors=remount-ro,data=ordered
├─/sys                                sysfs       sysfs         rw,nosuid,nodev,noexec,relatime
│ ├─/sys/kernel/security              securityfs  securityfs    rw,nosuid,nodev,noexec,relatime
│ ├─/sys/fs/cgroup                    tmpfs       tmpfs         rw,mode=755
│ │ ├─/sys/fs/cgroup/systemd          cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,xattr,release_agent=/lib/systemd/systemd-cgro
│ │ ├─/sys/fs/cgroup/cpu,cpuacct      cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,cpu,cpuacct
│ │ ├─/sys/fs/cgroup/freezer          cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,freezer
│ │ ├─/sys/fs/cgroup/perf_event       cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,perf_event,release_agent=/run/cgmanager/agent
│ │ ├─/sys/fs/cgroup/net_cls,net_prio cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,net_cls,net_prio
│ │ ├─/sys/fs/cgroup/devices          cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,devices
│ │ ├─/sys/fs/cgroup/memory           cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,memory
│ │ ├─/sys/fs/cgroup/blkio            cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,blkio
│ │ ├─/sys/fs/cgroup/pids             cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,pids,release_agent=/run/cgmanager/agents/cgm-
│ │ ├─/sys/fs/cgroup/rdma             cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,rdma,release_agent=/run/cgmanager/agents/cgm-
│ │ ├─/sys/fs/cgroup/hugetlb          cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,hugetlb,release_agent=/run/cgmanager/agents/c
│ │ └─/sys/fs/cgroup/cpuset           cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,cpuset,clone_children
│ ├─/sys/fs/pstore                    pstore      pstore        rw,nosuid,nodev,noexec,relatime
│ ├─/sys/kernel/debug                 debugfs     debugfs       rw,relatime
│ ├─/sys/kernel/config                configfs    configfs      rw,relatime
│ └─/sys/fs/fuse/connections          fusectl     fusectl       rw,relatime
├─/proc                               proc        proc          rw,nosuid,nodev,noexec,relatime
│ └─/proc/sys/fs/binfmt_misc          systemd-1   autofs        rw,relatime,fd=34,pgrp=1,timeout=0,minproto=5,maxproto=5,direct,pipe_ino=1676
│   └─/proc/sys/fs/binfmt_misc        binfmt_misc binfmt_misc   rw,relatime
├─/dev                                udev        devtmpfs      rw,nosuid,relatime,size=16418608k,nr_inodes=4104652,mode=755
│ ├─/dev/pts                          devpts      devpts        rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000
│ ├─/dev/shm                          tmpfs       tmpfs         rw,nosuid,nodev
│ ├─/dev/mqueue                       mqueue      mqueue        rw,relatime
│ └─/dev/hugepages                    hugetlbfs   hugetlbfs     rw,relatime,pagesize=2M
├─/run                                tmpfs       tmpfs         rw,nosuid,noexec,relatime,size=3290488k,mode=755
│ ├─/run/lock                         tmpfs       tmpfs         rw,nosuid,nodev,noexec,relatime,size=5120k
│ ├─/run/cgmanager/fs                 cgmfs       tmpfs         rw,relatime,size=100k,mode=755
│ └─/run/user/1000                    tmpfs       tmpfs         rw,nosuid,nodev,relatime,size=3290488k,mode=700,uid=1000,gid=1000
│   └─/run/user/1000/gvfs             gvfsd-fuse  fuse.gvfsd-fu rw,nosuid,nodev,relatime,user_id=1000,group_id=1000
├─/snap/core/6818                     /dev/loop1  squashfs      ro,nodev,relatime
├─/snap/core/6964                     /dev/loop0  squashfs      ro,nodev,relatime
├─/snap/kata-containers/352           /dev/loop2  squashfs      ro,nodev,relatime
├─/snap/kata-containers/288           /dev/loop4  squashfs      ro,nodev,relatime
├─/snap/core/6673                     /dev/loop3  squashfs      ro,nodev,relatime
└─/home                               /dev/sdb2   ext4          rw,noatime,discard,data=ordered

-n, --noheadings: 不输出标题

-O, --options : 根据挂载参数比如rw 过滤文件系统

➜  ~ findmnt -O rw
TARGET                                SOURCE      FSTYPE        OPTIONS
/                                     /dev/sdb1   ext4          rw,noatime,discard,errors=remount-ro,data=ordered
├─/sys                                sysfs       sysfs         rw,nosuid,nodev,noexec,relatime
│ ├─/sys/kernel/security              securityfs  securityfs    rw,nosuid,nodev,noexec,relatime
│ ├─/sys/fs/cgroup                    tmpfs       tmpfs         rw,mode=755
│ │ ├─/sys/fs/cgroup/systemd          cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,xattr,release_agent=/lib/systemd/systemd-cgro
│ │ ├─/sys/fs/cgroup/cpu,cpuacct      cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,cpu,cpuacct
│ │ ├─/sys/fs/cgroup/freezer          cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,freezer
│ │ ├─/sys/fs/cgroup/perf_event       cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,perf_event,release_agent=/run/cgmanager/agent
│ │ ├─/sys/fs/cgroup/net_cls,net_prio cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,net_cls,net_prio
│ │ ├─/sys/fs/cgroup/devices          cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,devices
│ │ ├─/sys/fs/cgroup/memory           cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,memory
│ │ ├─/sys/fs/cgroup/blkio            cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,blkio
│ │ ├─/sys/fs/cgroup/pids             cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,pids,release_agent=/run/cgmanager/agents/cgm-
│ │ ├─/sys/fs/cgroup/rdma             cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,rdma,release_agent=/run/cgmanager/agents/cgm-
│ │ ├─/sys/fs/cgroup/hugetlb          cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,hugetlb,release_agent=/run/cgmanager/agents/c
│ │ └─/sys/fs/cgroup/cpuset           cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,cpuset,clone_children
│ ├─/sys/fs/pstore                    pstore      pstore        rw,nosuid,nodev,noexec,relatime
│ ├─/sys/kernel/debug                 debugfs     debugfs       rw,relatime
│ ├─/sys/kernel/config                configfs    configfs      rw,relatime
│ └─/sys/fs/fuse/connections          fusectl     fusectl       rw,relatime
├─/proc                               proc        proc          rw,nosuid,nodev,noexec,relatime
│ └─/proc/sys/fs/binfmt_misc          systemd-1   autofs        rw,relatime,fd=34,pgrp=1,timeout=0,minproto=5,maxproto=5,direct,pipe_ino=1676
│   └─/proc/sys/fs/binfmt_misc        binfmt_misc binfmt_misc   rw,relatime
├─/dev                                udev        devtmpfs      rw,nosuid,relatime,size=16418608k,nr_inodes=4104652,mode=755
│ ├─/dev/pts                          devpts      devpts        rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000
│ ├─/dev/shm                          tmpfs       tmpfs         rw,nosuid,nodev
│ ├─/dev/mqueue                       mqueue      mqueue        rw,relatime
│ └─/dev/hugepages                    hugetlbfs   hugetlbfs     rw,relatime,pagesize=2M
├─/run                                tmpfs       tmpfs         rw,nosuid,noexec,relatime,size=3290488k,mode=755
│ ├─/run/lock                         tmpfs       tmpfs         rw,nosuid,nodev,noexec,relatime,size=5120k
│ ├─/run/cgmanager/fs                 cgmfs       tmpfs         rw,relatime,size=100k,mode=755
│ └─/run/user/1000                    tmpfs       tmpfs         rw,nosuid,nodev,relatime,size=3290488k,mode=700,uid=1000,gid=1000
│   └─/run/user/1000/gvfs             gvfsd-fuse  fuse.gvfsd-fu rw,nosuid,nodev,relatime,user_id=1000,group_id=1000
└─/home                               /dev/sdb2   ext4          rw,noatime,discard,data=ordered

-o, --output , 指定打印字段

-P, --pairs: 使用key="value"的输出格式

➜  ~ findmnt -P   
TARGET="/sys" SOURCE="sysfs" FSTYPE="sysfs" OPTIONS="rw,nosuid,nodev,noexec,relatime"
TARGET="/proc" SOURCE="proc" FSTYPE="proc" OPTIONS="rw,nosuid,nodev,noexec,relatime"
TARGET="/dev" SOURCE="udev" FSTYPE="devtmpfs" OPTIONS="rw,nosuid,relatime,size=16418608k,nr_inodes=4104652,mode=755"
TARGET="/dev/pts" SOURCE="devpts" FSTYPE="devpts" OPTIONS="rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000"
TARGET="/run" SOURCE="tmpfs" FSTYPE="tmpfs" OPTIONS="rw,nosuid,noexec,relatime,size=3290488k,mode=755"
TARGET="/" SOURCE="/dev/sdb1" FSTYPE="ext4" OPTIONS="rw,noatime,discard,errors=remount-ro,data=ordered"
TARGET="/sys/kernel/security" SOURCE="securityfs" FSTYPE="securityfs" OPTIONS="rw,nosuid,nodev,noexec,relatime"
TARGET="/dev/shm" SOURCE="tmpfs" FSTYPE="tmpfs" OPTIONS="rw,nosuid,nodev"
TARGET="/run/lock" SOURCE="tmpfs" FSTYPE="tmpfs" OPTIONS="rw,nosuid,nodev,noexec,relatime,size=5120k"
TARGET="/sys/fs/cgroup" SOURCE="tmpfs" FSTYPE="tmpfs" OPTIONS="rw,mode=755"
TARGET="/sys/fs/cgroup/systemd" SOURCE="cgroup" FSTYPE="cgroup" OPTIONS="rw,nosuid,nodev,noexec,relatime,xattr,release_agent=/lib/systemd/systemd-cgroups-agent,name=systemd"
TARGET="/sys/fs/pstore" SOURCE="pstore" FSTYPE="pstore" OPTIONS="rw,nosuid,nodev,noexec,relatime"
TARGET="/sys/fs/cgroup/cpu,cpuacct" SOURCE="cgroup" FSTYPE="cgroup" OPTIONS="rw,nosuid,nodev,noexec,relatime,cpu,cpuacct"
TARGET="/sys/fs/cgroup/freezer" SOURCE="cgroup" FSTYPE="cgroup" OPTIONS="rw,nosuid,nodev,noexec,relatime,freezer"
TARGET="/sys/fs/cgroup/perf_event" SOURCE="cgroup" FSTYPE="cgroup" OPTIONS="rw,nosuid,nodev,noexec,relatime,perf_event,release_agent=/run/cgmanager/agents/cgm-release-agent.perf_event"
TARGET="/sys/fs/cgroup/net_cls,net_prio" SOURCE="cgroup" FSTYPE="cgroup" OPTIONS="rw,nosuid,nodev,noexec,relatime,net_cls,net_prio"
TARGET="/sys/fs/cgroup/devices" SOURCE="cgroup" FSTYPE="cgroup" OPTIONS="rw,nosuid,nodev,noexec,relatime,devices"
TARGET="/sys/fs/cgroup/memory" SOURCE="cgroup" FSTYPE="cgroup" OPTIONS="rw,nosuid,nodev,noexec,relatime,memory"
TARGET="/sys/fs/cgroup/blkio" SOURCE="cgroup" FSTYPE="cgroup" OPTIONS="rw,nosuid,nodev,noexec,relatime,blkio"
TARGET="/sys/fs/cgroup/pids" SOURCE="cgroup" FSTYPE="cgroup" OPTIONS="rw,nosuid,nodev,noexec,relatime,pids,release_agent=/run/cgmanager/agents/cgm-release-agent.pids"
TARGET="/sys/fs/cgroup/rdma" SOURCE="cgroup" FSTYPE="cgroup" OPTIONS="rw,nosuid,nodev,noexec,relatime,rdma,release_agent=/run/cgmanager/agents/cgm-release-agent.rdma"
TARGET="/sys/fs/cgroup/hugetlb" SOURCE="cgroup" FSTYPE="cgroup" OPTIONS="rw,nosuid,nodev,noexec,relatime,hugetlb,release_agent=/run/cgmanager/agents/cgm-release-agent.hugetlb"
TARGET="/sys/fs/cgroup/cpuset" SOURCE="cgroup" FSTYPE="cgroup" OPTIONS="rw,nosuid,nodev,noexec,relatime,cpuset,clone_children"
TARGET="/proc/sys/fs/binfmt_misc" SOURCE="systemd-1" FSTYPE="autofs" OPTIONS="rw,relatime,fd=34,pgrp=1,timeout=0,minproto=5,maxproto=5,direct,pipe_ino=16766"
TARGET="/dev/mqueue" SOURCE="mqueue" FSTYPE="mqueue" OPTIONS="rw,relatime"
TARGET="/sys/kernel/debug" SOURCE="debugfs" FSTYPE="debugfs" OPTIONS="rw,relatime"
TARGET="/dev/hugepages" SOURCE="hugetlbfs" FSTYPE="hugetlbfs" OPTIONS="rw,relatime,pagesize=2M"
TARGET="/sys/kernel/config" SOURCE="configfs" FSTYPE="configfs" OPTIONS="rw,relatime"
TARGET="/sys/fs/fuse/connections" SOURCE="fusectl" FSTYPE="fusectl" OPTIONS="rw,relatime"
TARGET="/snap/kata-containers/352" SOURCE="/dev/loop2" FSTYPE="squashfs" OPTIONS="ro,nodev,relatime"
TARGET="/snap/core/6818" SOURCE="/dev/loop1" FSTYPE="squashfs" OPTIONS="ro,nodev,relatime"
TARGET="/snap/core/6964" SOURCE="/dev/loop0" FSTYPE="squashfs" OPTIONS="ro,nodev,relatime"
TARGET="/snap/kata-containers/288" SOURCE="/dev/loop4" FSTYPE="squashfs" OPTIONS="ro,nodev,relatime"
TARGET="/snap/core/6673" SOURCE="/dev/loop3" FSTYPE="squashfs" OPTIONS="ro,nodev,relatime"
TARGET="/home" SOURCE="/dev/sdb2" FSTYPE="ext4" OPTIONS="rw,noatime,discard,data=ordered"
TARGET="/proc/sys/fs/binfmt_misc" SOURCE="binfmt_misc" FSTYPE="binfmt_misc" OPTIONS="rw,relatime"
TARGET="/run/cgmanager/fs" SOURCE="cgmfs" FSTYPE="tmpfs" OPTIONS="rw,relatime,size=100k,mode=755"
TARGET="/run/user/1000" SOURCE="tmpfs" FSTYPE="tmpfs" OPTIONS="rw,nosuid,nodev,relatime,size=3290488k,mode=700,uid=1000,gid=1000"
TARGET="/run/user/1000/gvfs" SOURCE="gvfsd-fuse" FSTYPE="fuse.gvfsd-fuse" OPTIONS="rw,nosuid,nodev,relatime,user_id=1000,group_id=1000"

-R, --submounts: 打印挂载文件系统的父子关系

➜  ~ findmnt -R
TARGET                                SOURCE      FSTYPE        OPTIONS
/                                     /dev/sdb1   ext4          rw,noatime,discard,errors=remount-ro,data=ordered
├─/sys                                sysfs       sysfs         rw,nosuid,nodev,noexec,relatime
│ ├─/sys/kernel/security              securityfs  securityfs    rw,nosuid,nodev,noexec,relatime
│ ├─/sys/fs/cgroup                    tmpfs       tmpfs         rw,mode=755
│ │ ├─/sys/fs/cgroup/systemd          cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,xattr,release_agent=/lib/systemd/systemd-cgro
│ │ ├─/sys/fs/cgroup/cpu,cpuacct      cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,cpu,cpuacct
│ │ ├─/sys/fs/cgroup/freezer          cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,freezer
│ │ ├─/sys/fs/cgroup/perf_event       cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,perf_event,release_agent=/run/cgmanager/agent
│ │ ├─/sys/fs/cgroup/net_cls,net_prio cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,net_cls,net_prio
│ │ ├─/sys/fs/cgroup/devices          cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,devices
│ │ ├─/sys/fs/cgroup/memory           cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,memory
│ │ ├─/sys/fs/cgroup/blkio            cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,blkio
│ │ ├─/sys/fs/cgroup/pids             cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,pids,release_agent=/run/cgmanager/agents/cgm-
│ │ ├─/sys/fs/cgroup/rdma             cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,rdma,release_agent=/run/cgmanager/agents/cgm-
│ │ ├─/sys/fs/cgroup/hugetlb          cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,hugetlb,release_agent=/run/cgmanager/agents/c
│ │ └─/sys/fs/cgroup/cpuset           cgroup      cgroup        rw,nosuid,nodev,noexec,relatime,cpuset,clone_children
│ ├─/sys/fs/pstore                    pstore      pstore        rw,nosuid,nodev,noexec,relatime
│ ├─/sys/kernel/debug                 debugfs     debugfs       rw,relatime
│ ├─/sys/kernel/config                configfs    configfs      rw,relatime
│ └─/sys/fs/fuse/connections          fusectl     fusectl       rw,relatime
├─/proc                               proc        proc          rw,nosuid,nodev,noexec,relatime
│ └─/proc/sys/fs/binfmt_misc          systemd-1   autofs        rw,relatime,fd=34,pgrp=1,timeout=0,minproto=5,maxproto=5,direct,pipe_ino=1676
│   └─/proc/sys/fs/binfmt_misc        binfmt_misc binfmt_misc   rw,relatime
├─/dev                                udev        devtmpfs      rw,nosuid,relatime,size=16418608k,nr_inodes=4104652,mode=755
│ ├─/dev/pts                          devpts      devpts        rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000
│ ├─/dev/shm                          tmpfs       tmpfs         rw,nosuid,nodev
│ ├─/dev/mqueue                       mqueue      mqueue        rw,relatime
│ └─/dev/hugepages                    hugetlbfs   hugetlbfs     rw,relatime,pagesize=2M
├─/run                                tmpfs       tmpfs         rw,nosuid,noexec,relatime,size=3290488k,mode=755
│ ├─/run/lock                         tmpfs       tmpfs         rw,nosuid,nodev,noexec,relatime,size=5120k
│ ├─/run/cgmanager/fs                 cgmfs       tmpfs         rw,relatime,size=100k,mode=755
│ └─/run/user/1000                    tmpfs       tmpfs         rw,nosuid,nodev,relatime,size=3290488k,mode=700,uid=1000,gid=1000
│   └─/run/user/1000/gvfs             gvfsd-fuse  fuse.gvfsd-fu rw,nosuid,nodev,relatime,user_id=1000,group_id=1000
├─/snap/core/6818                     /dev/loop1  squashfs      ro,nodev,relatime
├─/snap/core/6964                     /dev/loop0  squashfs      ro,nodev,relatime
├─/snap/kata-containers/352           /dev/loop2  squashfs      ro,nodev,relatime
├─/snap/kata-containers/288           /dev/loop4  squashfs      ro,nodev,relatime
├─/snap/core/6673                     /dev/loop3  squashfs      ro,nodev,relatime
└─/home                               /dev/sdb2   ext4          rw,noatime,discard,data=ordered

-r, --raw: raw格式打印

➜  ~ findmnt -r
TARGET SOURCE FSTYPE OPTIONS
/sys sysfs sysfs rw,nosuid,nodev,noexec,relatime
/proc proc proc rw,nosuid,nodev,noexec,relatime
/dev udev devtmpfs rw,nosuid,relatime,size=16418608k,nr_inodes=4104652,mode=755
/dev/pts devpts devpts rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000
/run tmpfs tmpfs rw,nosuid,noexec,relatime,size=3290488k,mode=755
/ /dev/sdb1 ext4 rw,noatime,discard,errors=remount-ro,data=ordered
/sys/kernel/security securityfs securityfs rw,nosuid,nodev,noexec,relatime
/dev/shm tmpfs tmpfs rw,nosuid,nodev
/run/lock tmpfs tmpfs rw,nosuid,nodev,noexec,relatime,size=5120k
/sys/fs/cgroup tmpfs tmpfs rw,mode=755
/sys/fs/cgroup/systemd cgroup cgroup rw,nosuid,nodev,noexec,relatime,xattr,release_agent=/lib/systemd/systemd-cgroups-agent,name=systemd
/sys/fs/pstore pstore pstore rw,nosuid,nodev,noexec,relatime
/sys/fs/cgroup/cpu,cpuacct cgroup cgroup rw,nosuid,nodev,noexec,relatime,cpu,cpuacct
/sys/fs/cgroup/freezer cgroup cgroup rw,nosuid,nodev,noexec,relatime,freezer
/sys/fs/cgroup/perf_event cgroup cgroup rw,nosuid,nodev,noexec,relatime,perf_event,release_agent=/run/cgmanager/agents/cgm-release-agent.perf_event
/sys/fs/cgroup/net_cls,net_prio cgroup cgroup rw,nosuid,nodev,noexec,relatime,net_cls,net_prio
/sys/fs/cgroup/devices cgroup cgroup rw,nosuid,nodev,noexec,relatime,devices
/sys/fs/cgroup/memory cgroup cgroup rw,nosuid,nodev,noexec,relatime,memory
/sys/fs/cgroup/blkio cgroup cgroup rw,nosuid,nodev,noexec,relatime,blkio
/sys/fs/cgroup/pids cgroup cgroup rw,nosuid,nodev,noexec,relatime,pids,release_agent=/run/cgmanager/agents/cgm-release-agent.pids
/sys/fs/cgroup/rdma cgroup cgroup rw,nosuid,nodev,noexec,relatime,rdma,release_agent=/run/cgmanager/agents/cgm-release-agent.rdma
/sys/fs/cgroup/hugetlb cgroup cgroup rw,nosuid,nodev,noexec,relatime,hugetlb,release_agent=/run/cgmanager/agents/cgm-release-agent.hugetlb
/sys/fs/cgroup/cpuset cgroup cgroup rw,nosuid,nodev,noexec,relatime,cpuset,clone_children
/proc/sys/fs/binfmt_misc systemd-1 autofs rw,relatime,fd=34,pgrp=1,timeout=0,minproto=5,maxproto=5,direct,pipe_ino=16766
/dev/mqueue mqueue mqueue rw,relatime
/sys/kernel/debug debugfs debugfs rw,relatime
/dev/hugepages hugetlbfs hugetlbfs rw,relatime,pagesize=2M
/sys/kernel/config configfs configfs rw,relatime
/sys/fs/fuse/connections fusectl fusectl rw,relatime
/snap/kata-containers/352 /dev/loop2 squashfs ro,nodev,relatime
/snap/core/6818 /dev/loop1 squashfs ro,nodev,relatime
/snap/core/6964 /dev/loop0 squashfs ro,nodev,relatime
/snap/kata-containers/288 /dev/loop4 squashfs ro,nodev,relatime
/snap/core/6673 /dev/loop3 squashfs ro,nodev,relatime
/home /dev/sdb2 ext4 rw,noatime,discard,data=ordered
/proc/sys/fs/binfmt_misc binfmt_misc binfmt_misc rw,relatime
/run/cgmanager/fs cgmfs tmpfs rw,relatime,size=100k,mode=755
/run/user/1000 tmpfs tmpfs rw,nosuid,nodev,relatime,size=3290488k,mode=700,uid=1000,gid=1000
/run/user/1000/gvfs gvfsd-fuse fuse.gvfsd-fuse rw,nosuid,nodev,relatime,user_id=1000,group_id=1000

-S, --source : 打印指定 name, maj:min, LABEL=, UUID=, PARTUUID=, PARTLABEL=,的挂载

-T, --target : 打印指定路径的文件系统信息

➜  ~ findmnt -T /home
TARGET SOURCE    FSTYPE OPTIONS
/home  /dev/sdb2 ext4   rw,noatime,discard,data=ordered

-M, --mountpoint

: 挂载点的目录文件系统信息

-t, --types : 打印指定类型的文件系统,如ext4

➜  ~ findmnt -t ext4
TARGET  SOURCE    FSTYPE OPTIONS
/       /dev/sdb1 ext4   rw,noatime,discard,errors=remount-ro,data=ordered
└─/home /dev/sdb2 ext4   rw,noatime,discard,data=ordered

-U, --uniq: 去重,多重挂载的目标

-u, --notruncate: 不去掉空行输出

-v, --nofsroot: 不打印目录的绑定和btrfs的挂载信息

标签：relatime,rw,findmnt,sys,命令,详解,cgroup,nosuid,nodev
From： https://www.cnblogs.com/ishmaelwanglin/p/17053180.html

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