Python full stack _day10_nfs and scheduled Tasks

1. nfs1.1 Installation

Yum Install Rpcbind nfs-utils-y

1.2 Configuration

Configuration file path:/etc/exports

NFS Configuration file Format:

< shared directory > < client 1> (options) < client 2> (option)

Shared directory: The directory that the NFS server shares to the client

Client: The network can access the shared host, multiple clients use a space separate

Options: Set permissions for the directory, user mappings, and so on. Multiple options are separated with commas.

Common options include:

Sync: Performs the input and output actions of the file system in a synchronous manner.　　　　　　Async: Performs an asynchronous file system input and output action in an unsynchronized manner.　　　　　　RO: Loaded in read-only mode. RW: Load in read/write mode.
Defaults: Use the default options.　　　　　　The default options are RW, suid, dev, exec, Anto Nouser, and async.　　　　　　Atime: Each access updates the Inode's access time, the default setting, and the Cancel option is noatime. Noatime: The Inode's access time is not updated on each access. Example:/share 192.168.16.185 (Rw,sync) 1.3 start

Systemctl Start Rpcbind

Systemctl Start NFS

1.4 Client Mount

Mount service-side IP: Shared directory destination Directory

2. Scheduled Tasks

Crond services are divided into system scheduled tasks and user scheduled tasks.

System-Level Scheduled tasks: Modify the configuration file/etc/crontab file to create a scheduled task.

User-level Scheduled tasks: Normal users edit their own scheduled tasks directly using the CRONTAB-E command. The root administrator can use crontab-e-u [user name] To modify a user's scheduled tasks. All user-defined crontab files are saved in the/var/spool/cron directory.

3) crontab file format: Both user-level and system-level file formats are the same.

# Example of Job definition:
#.----------------minute (0-59)//min (0-59)
# |.-------------hour (0-23)//h (0-23)
# | |.----------DAY of Month (1-31)//Date (1-31)
# | | |.-------month (1-12) OR jan,feb,mar,apr ... Month (1-12) or use the English abbreviation of the Month
# | | | |.----DAY of Week (0-6) (sunday=0 or 7) or Sun,mon,tue,wed,thu,fri,sat//days of the Week (0-6) or English shorthand for the use of the week
# | | | | |
# * * * * * * user-name command to be executed//username: Who will perform this task command to be executed: the command to execute

4) crontab Command parameters:

-U: Specify user

-E: Editing a user scheduled task

-L: Displays the contents of a user's scheduled tasks

-R: Delete a user's scheduled tasks

-I: Prompt for confirmation when deleting user files

Python full stack _day10_nfs and scheduled Tasks