Linux Basic Learning (11) Time synchronization device mount

# # #时间的同步 # #

1. Service side
   

Yum Install Chrony-y # #安装服务

vim/etc/chrony.conf # #主配置文件

#Allow NTP Client access from the local network.

Allow 172.25.0.0/24 # #允许谁去同步我的时间

#Serve time even if not synchronized to any NET server

Stratum local #不去同步任何人的时间, time synchronization server level

Systemctl Restart Chronyd

Systemctl Stop Firewalld

2. Client

Vim/etc/chrony.conf

3 Server 0.rhel.pool.ntp.org Iburst

4 server 1.rhel.pool.ntp.org iburst=======>server Ntpserverip iburst

5 server 2.rhel.pool.ntp.org iburst=======>

6 Server 3.rhel.pool.ntp.org Iburst

Systemctl Restart Chronyd

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# # #timedatectl命令

Timedatectl Status # #显示当前时间信息

Set-time # #设定当前时间

List-timezones # #列出所有时区

Set-timezone # #设定当前时区

SET-LOCAL-RTC 0|1 # #设定是否使用utc时间

# # #设备识别

Serial Drive SATA SDA

and Port HDD SDA HDA

/DEV/XDXN # #硬盘设备/DEV/SDA1

/dev/cdrom # #光驱

/dev/mapper/* # #虚拟设备

# # # #设备的发现

Fdisk-1 # #查看真实存在的设备

Cat/proc/partitions # #查看系统能够识别的设备

Blkid # #系统能够挂载使用的设备id

DF # #查看设备被系统使用的情况

# # #设备的使用

1. Mounting of the device
   

Mount Device mount point

MOUNT/DEV/SDB1/MNT # #把电脑第二块硬盘的第一个分区挂载到/mnt under

2. Uninstalling the device

Umount Equipment | mount point

If the target is busy error occurs when uninstalling the device, the workaround is as follows:

FUSER-KVM Device | mount point ##-k kill-v Show details-m scan device

# # # #软硬连接

Soft Links: Multiple nodes corresponding to a block of data

Hard Links: One node corresponds to multiple data blocks

Ls-i # #查看文件节点号

Ln-s/file/file1 # #软链接

Ln/file/file1 # #硬链接

# # #文件查找

1. Locate filename # #在文件数据库中搜索信息
   

2. UpdateDB # #更新数据库

Find find location-condition criteria Value

-name

-user

-group

-size

-not

Linux Basic Learning (11) Time synchronization device mount