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| Section | Objectives |
|---|---|
| Deploy, configure, and maintain systems | - Configure time service clients - Configure systems to boot into a specific target automatically - Install and update software packages - Modify the system bootloader - Start and stop services and configure services to start automatically at boot - Schedule tasks using at, cron, and systemd timer units |
| Create and configure file systems | - Diagnose and correct file permission problems - Extend existing logical volumes - Mount and unmount network file systems using NFS - Create, mount, unmount, and use VFAT, ext4, and XFS file systems - Configure autofs |
| Operate running systems | - Start, stop, and check the status of network services - Preserve system journals - Boot, reboot, and shut down a system normally - Manage tuning profiles - Boot systems into different targets manually - Locate and interpret system log files and journals - Interrupt the boot process to gain access to a system - Identify CPU and memory intensive processes and kill processes - Securely transfer files between systems - Adjust process scheduling |
| Manage users and groups | - Configure privileged access - Create, delete, and modify local user accounts - Change passwords and adjust password aging for local users - Create, delete, and modify local groups and group memberships |
| Configure local storage | - Configure systems to mount file systems at boot by UUID or label - Assign physical volumes to volume groups - List, create, and delete partitions on GPT disks - Create and remove physical volumes - Add new partitions, logical volumes, and swap non-destructively - Create and delete logical volumes |
| Create simple shell scripts | - Process output of shell commands within a script - Conditionally execute code - Process script inputs - Use looping constructs to process files and command-line input |
| Manage security | - Use Boolean settings to modify SELinux settings - List and identify SELinux file and process contexts - Restore default file contexts - Manage default file permissions - Configure firewall settings using firewall-cmd and firewalld - Configure key-based authentication for SSH - Manage SELinux port labels - Set enforcing and permissive modes for SELinux |
| Manage software | - Configure access to RPM repositories - Configure access to Flatpak repositories - Install and remove Flatpak software packages - Install and remove RPM software packages |
| Manage basic networking | - Configure hostname resolution - Configure IPv4 and IPv6 addresses - Restrict network access using firewalld and firewall-cmd - Configure network services to start automatically at boot |
| Understand and use essential tools | - Use grep and regular expressions to analyze text - Access remote systems using SSH - Log in and switch users in multi-user targets - Use input-output redirection - Access a shell prompt and issue commands with correct syntax - List, set, and change standard ugo/rwx permissions - Create, delete, copy, and move files and directories - Archive, compress, unpack, and uncompress files using tar, gzip, and bzip2 - Create and edit text files - Locate, read, and use system documentation - Create hard and soft links |
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NEW QUESTION # 58
CORRECT TEXT
Create a volume group, and set 16M as a extends. And divided a volume group containing 50 extends on volume group lv, make it as ext4 file system, and mounted automatically under /mnt/data.
Answer:
Explanation:
# pvcreate /dev/sda7 /dev/sda8
# vgcreate -s 16M vg1 /dev/sda7 /dev/sda8
# lvcreate -l 50 -n lvm02
# mkfs.ext4 /dev/vg1/lvm02
# blkid /dev/vg1/lv1
# vim /etc/fstab
# mkdir -p /mnt/data
UUID=xxxxxxxx /mnt/data ext4 defaults 0 0
# vim /etc/fstab
# mount -a
# mount
(Verify)
NEW QUESTION # 59
Part 1 (on Node1 Server)
Task 11 [Scheduling Future Tasks]
The user natasha must configure a cron job that runs daily at 14:23 local time and also the same cron job will run after every 2 minutes and executes:
/bin/echo hello
Answer:
Explanation:
* [root@node1 ~]# crontab -l -u natasha
no crontab for natasha
[root@node1 ~]# crontab -e -u natasha
23 14 * * * /bin/echo hello
*/2 * * * * /bin/echo 2min
crontab: installing new crontab
[root@node1 ~]# crontab -l -u natasha
23 14 * * * /bin/echo hello
*/2 * * * * /bin/echo 2min
[root@node1 ~]# systemctl status crond.service
* ### For Checking ###
[root@node1 ~]# tail -f /var/log/cron
Mar 23 13:23:48 node1 crontab[10636]: (root) REPLACE (natasha)
Mar 23 13:23:48 node1 crontab[10636]: (root) END EDIT (natasha)
Mar 23 13:23:50 node1 crontab[10638]: (root) LIST (natasha)
Mar 23 13:24:01 node1 crond[1349]: (root) FAILED (loading cron table)
Mar 23 13:24:02 node1 CROND[10673]: (natasha) CMD (/bin/echo 2min)
NEW QUESTION # 60
Configure a restrictive umask for user natasha so new files become 400 and directories become 500.
Answer:
Explanation:
See the solution below in Explanation.
Explanation:
Solution:
echo "umask 0277" > > /home/natasha/.bash_profile
Detailed Explanation:
* A umask of 0277 removes group and other permissions entirely.
* New files: base 666 minus mask 277 gives 400.
* New directories: base 777 minus mask 277 gives 500.
* Putting it in .bash_profile applies it for that user's login shell.
NEW QUESTION # 61
Adjust the size of the Logical Volume.
Adjust the size of the vo Logical Volume, its file system size should be 290M. Make sure that the content of this system is complete.
Note: the partition size is rarely accurate to the same size as required, so in the range 270M to 320M is acceptable.
Answer:
Explanation:
see explanation below.
Explanation
Addition
df -hT
lvextend -L +100M /dev/vg0/vo
Lvscan
xfs_growfs /home/ //home is the mounted directory of the LVM, this step just need to do in the practice environment, and test EXT4 does not need this step.
resize2fs /dev/vg0/vo// use this command to update in examination.
df -hT
OR
Subtraction
e2fsck -f/dev/vg0/vo
umount /home
resize2fs /dev/vg0/vo // the final required partition capacity is 100M lvreduce -l 100M /dev/vg0/vo mount /dev/vg0/vo/home df -hT
NEW QUESTION # 62
SIMULATION
Make a swap partition having 100MB. Make Automatically Usable at System Boot Time.
Answer:
Explanation:
See explanation below.
Explanation/Reference:
Explanation:
Use fdisk /dev/hda ->To create new partition.
Type n-> For New partition
It will ask for Logical or Primary Partitions. Press l for logical.
It will ask for the Starting Cylinder: Use the Default by pressing Enter Key.
Type the Size: +100M ->You can Specify either Last cylinder of Size here.
Press P to verify the partitions lists and remember the partitions name. Default System ID is 83 that means Linux Native.
Type t to change the System ID of partition.
Type Partition Number
Type 82 that means Linux Swap.
Press w to write on partitions table.
Either Reboot or use partprobe command.
mkswap /dev/hda? ->To create Swap File system on partition.
swapon /dev/hda? ->To enable the Swap space from partition.
free -m ->Verify Either Swap is enabled or not.
vi /etc/fstab/dev/hda? swap swap defaults 0 0
Reboot the System and verify that swap is automatically enabled or not.
NEW QUESTION # 63
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