Linux Jobs 7

1, create a 10G partition, and the format of the Ext4 file system;

(1) The block size is required to 2048, the reserved space percentage is 2, the volume label is MyData, the default Mount property contains ACLs;

(2) Mount to the/data/mydata directory, require the mount to prohibit the program to run automatically, and do not update the file access time stamp;

1, create the partition;

Use the FDISK command to create a partition on disk/dev/sdb, as follows:

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2, formatted partition;

Use the MKE2FS command to format the/DEV/SDB1 as a Ext4 file system:

MKE2FS Command Options Description:

-T: Specifies the file system;

-B: Specifies the disk block size, in bytes;

-M: Specifies the percentage of space that is reserved for administrative personnel, which can be used to specify a percentage of the reserved space, by default 5%, to prevent the management operation (MV, CP, etc.) from being exhausted;

-L: Specify the volume label;

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When formatting a partition in CentOS7, the ACL mount option is already included by default and can be viewed by the tune2fs-l command, as follows:

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If not, you can modify the default mount properties by using the TUNE2FS command option, as follows:

Tune2fs-o {Feature|^feature}

FEATURE: Enable default properties

^feature: Disabling Default properties

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3. Mount File System

To mount the file system using the Mount command, the process is as follows:

1). Create a file system mount directory, which is the mount point;

2). Mount using the Mount command and use-O to enable or disable file system options;

Mount File System Option Description:

NOEXEC: Do not allow files on the file system to run as a process, even if the file has Execute permission;

Noatime: Does not update its access timestamp when accessing a file or directory to reduce disk I/O;

3). Verification;

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2, create a swap partition of size 1G, and create a good file system, and enable it;

3. Write a script

(1), obtain and list all disk devices on the current system;

(2), display the space usage information about each partition on each disk device;

4. Summarize the different levels of RAID and its combination mode and performance;

5, the creation of a size of 10G RAID1, requires a free disk, and chunk size of 128k;

6, the creation of a size of 4G RAID5 device, chunk size of 256k, format Ext4 file system, required to automatically mount to the/backup directory, and do not update the access timestamp, and support ACL function;

7. Write a script

(1) Accept more than one file path as a parameter;

(2) show the number of rows owned by each file;

(3) A summary of the total number of documents for several statistics of their lines;

8. Write a script

(1) Pass more than two strings as user name;

(2) Create these users, and the password with the user name;

(3) A summary of the total creation of a number of users;

9, write a script, create a new 20 users, visitor1-visitor20; calculate the sum of their IDs;

10. Write a script that counts the sum of the number of lines starting with # in/etc/rc.d/rc.sysinit,/etc/rc.d/init.d/functions, and/etc/fstab files, and the total number of blank lines;

11. Write a script that shows the user name, UID, and the UID of all the default shell users on the current system.

12. Write a script that displays the user name of all the users on the current system with additional groups, and how many such users are in total;

13. Create a volume group of at least two physical volumes with a size of 20G, requiring a PE size of 8M, and creating a logical volume of 5G in the volume group MYLV1, formatted as EXT4 file system, boot automatically mounts to/users directory, support ACL;

14, the new user magedu, the home directory is/users/magedu, and then su switch to this user, copy multiple files to the home directory;

15, expand MYLV1 to 9G, ensure that the original data is fully available after the expansion;

16, reduce MYLV1 to 7G, to ensure that the original data is fully available after the completion of the reduction;

17, the MYLV1 to create a snapshot, and through the backup data, the requirement to retain the original genera group and other information;

This article from "Silver Kay Blog" blog, declined reprint!

Linux Jobs 7