How to remount the data disk after initializing the system disk of a Linux instance-Linux Operation and Maintenance-php.cn

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How to remount the data disk after initializing the system disk of a Linux instance

坏嘻嘻

Sep 29, 2018 pm 01:55 PM

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The content of this article is about how to remount the data disk after the Linux instance initializes the system disk. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

Linux instance initializes the system disk and then remounts the data disk

In a Linux instance, reinitializing the system disk will not change the contents of the data disk, but the mounting information of the data disk will be lost. , so, after Linux restarts, follow the steps below to create new mount point information and mount the data disk partition.

Note: In this document, it is assumed that before initializing the system disk, the partition name of the data disk mounted on the instance is /dev/vdb1, and the name of the mount point is /InitTest.

View the data disk mounting information: run the mount command. There is no information about /dev/vdb1 in the returned result.

sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime)
proc on /proc type proc (rw,nosuid,nodev,noexec,relatime)
devtmpfs on /dev type devtmpfs (rw,nosuid,size=497476k,nr_inodes=124369,mode=755)
securityfs on /sys/kernel/security type securityfs (rw,nosuid,nodev,noexec,relatime)
tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev)
devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
tmpfs on /run type tmpfs (rw,nosuid,nodev,mode=755)
tmpfs on /sys/fs/cgroup type tmpfs (ro,nosuid,nodev,noexec,mode=755)
cgroup on /sys/fs/cgroup/systemd type cgroup (rw,nosuid,nodev,noexec,relatime,xattr,release_agent=/usr/lib/systemd/systemd-cgroups-agent,name=systemd)
pstore on /sys/fs/pstore type pstore (rw,nosuid,nodev,noexec,relatime)
cgroup on /sys/fs/cgroup/devices type cgroup (rw,nosuid,nodev,noexec,relatime,devices)
cgroup on /sys/fs/cgroup/blkio type cgroup (rw,nosuid,nodev,noexec,relatime,blkio)
cgroup on /sys/fs/cgroup/net_cls,net_prio type cgroup (rw,nosuid,nodev,noexec,relatime,net_prio,net_cls)
cgroup on /sys/fs/cgroup/memory type cgroup (rw,nosuid,nodev,noexec,relatime,memory)
cgroup on /sys/fs/cgroup/freezer type cgroup (rw,nosuid,nodev,noexec,relatime,freezer)
cgroup on /sys/fs/cgroup/hugetlb type cgroup (rw,nosuid,nodev,noexec,relatime,hugetlb)
cgroup on /sys/fs/cgroup/perf_event type cgroup (rw,nosuid,nodev,noexec,relatime,perf_event)
cgroup on /sys/fs/cgroup/cpu,cpuacct type cgroup (rw,nosuid,nodev,noexec,relatime,cpuacct,cpu)
cgroup on /sys/fs/cgroup/pids type cgroup (rw,nosuid,nodev,noexec,relatime,pids)
cgroup on /sys/fs/cgroup/cpuset type cgroup (rw,nosuid,nodev,noexec,relatime,cpuset)
configfs on /sys/kernel/config type configfs (rw,relatime)
/dev/vda1 on / type ext4 (rw,relatime,data=ordered)
systemd-1 on /proc/sys/fs/binfmt_misc type autofs (rw,relatime,fd=29,pgrp=1,timeout=0,minproto=5,maxproto=5,direct,pipe_ino=9791)
hugetlbfs on /dev/hugepages type hugetlbfs (rw,relatime)
mqueue on /dev/mqueue type mqueue (rw,relatime)
debugfs on /sys/kernel/debug type debugfs (rw,relatime)
tmpfs on /run/user/0 type tmpfs (rw,nosuid,nodev,relatime,size=101620k,mode=700)

View data disk partition information: Run the command fdisk -l.

Disk /dev/vda: 42.9 GB, 42949672960 bytes, 83886080 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x0008d73a
Device Boot      Start         End      Blocks   Id  System
/dev/vda1   *        2048    83884031    41940992   83  Linux
Disk /dev/vdb: 25.8 GB, 25769803776 bytes, 50331648 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0xfe6d77c1
Device Boot      Start         End      Blocks   Id  System
/dev/vdb1            2048    50331647    25164800   83  Linux

Re-create the mount point of the data disk partition: Run the command

mkdir /InitTest

Note: The mount point name here must be the same as the mount point name of /dev/vdb1 before the system disk was initialized. consistent. You can view the original mount point name through the cat /etc/fstab command.

Remount the data disk partition: Run the command

mount /dev/vdb1 /InitTest

Check the mounting result: Run the command

df -h

Check whether /dev/vdb1 can be automatically mounted:

Uninstall /dev/vdb1: Run the command

umount /dev/vdb1

View the mount information: Run the command mount. If the uninstallation is successful, there will be no information about /dev/vdb1 in the returned result.

Automatically mount /dev/vdb1: Run the command

mount -a

View the mount information: Run the command mount. If the automatic mounting is successful, the information about /dev/vdb1 will be included in the returned result.

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