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| Section | Objectives |
|---|---|
| Create simple shell scripts | - Process output of shell commands within a script - Process script inputs - Use looping constructs to process files and command-line input - Conditionally execute code |
| Manage software | - Install and remove RPM software packages - Configure access to Flatpak repositories - Install and remove Flatpak software packages - Configure access to RPM repositories |
| Create and configure file systems | - Extend existing logical volumes - Configure autofs - Mount and unmount network file systems using NFS - Diagnose and correct file permission problems - Create, mount, unmount, and use VFAT, ext4, and XFS file systems |
| Configure local storage | - Assign physical volumes to volume groups - Configure systems to mount file systems at boot by UUID or label - Create and delete logical volumes - Add new partitions, logical volumes, and swap non-destructively - List, create, and delete partitions on GPT disks - Create and remove physical volumes |
| Deploy, configure, and maintain systems | - Configure systems to boot into a specific target automatically - Install and update software packages - Modify the system bootloader - Configure time service clients - Schedule tasks using at, cron, and systemd timer units - Start and stop services and configure services to start automatically at boot |
| Manage users and groups | - Configure privileged access - Create, delete, and modify local groups and group memberships - Create, delete, and modify local user accounts - Change passwords and adjust password aging for local users |
| Understand and use essential tools | - Archive, compress, unpack, and uncompress files using tar, gzip, and bzip2 - Create, delete, copy, and move files and directories - Create hard and soft links - Use input-output redirection - List, set, and change standard ugo/rwx permissions - Log in and switch users in multi-user targets - Access remote systems using SSH - Create and edit text files - Locate, read, and use system documentation - Use grep and regular expressions to analyze text - Access a shell prompt and issue commands with correct syntax |
| Manage security | - Configure key-based authentication for SSH - Configure firewall settings using firewall-cmd and firewalld - Use Boolean settings to modify SELinux settings - Set enforcing and permissive modes for SELinux - Manage default file permissions - List and identify SELinux file and process contexts - Manage SELinux port labels - Restore default file contexts |
| Operate running systems | - Adjust process scheduling - Securely transfer files between systems - Preserve system journals - Manage tuning profiles - Identify CPU and memory intensive processes and kill processes - Boot systems into different targets manually - Boot, reboot, and shut down a system normally - Interrupt the boot process to gain access to a system - Start, stop, and check the status of network services - Locate and interpret system log files and journals |
| Manage basic networking | - Restrict network access using firewalld and firewall-cmd - Configure network services to start automatically at boot - Configure IPv4 and IPv6 addresses - Configure hostname resolution |
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NEW QUESTION # 45
Which of the following statements describes the principal concept behind test driven development?
Answer: D
Explanation:
Explanation/Reference:
Reference https://en.wikipedia.org/wiki/Test-driven_development
NEW QUESTION # 46
Create a volume group, and set 8M as a extends. Divided a volume group containing 50 extends on volume group lv (lvshare), make it as ext4 file system, and mounted automatically under /mnt/data. And the size of the floating range should set between 380M and 400M.
Answer:
Explanation:
see explanation below.
Explanation
# fdisk
# partprobe
# pvcreate /dev/vda6
# vgcreate -s 8M vg1 /dev/vda6 -s
# lvcreate -n lvshare -l 50 vg1 -l
# mkfs.ext4 /dev/vg1/lvshare
# mkdir -p /mnt/data
# vim /etc/fstab
/dev/vg1/lvshare /mnt/data ext4 defaults 0 0
# mount -a
# df -h
NEW QUESTION # 47
Change the logical volume capacity named vo from 190M to 300M. and the size of the floating range should set between 280 and 320. (This logical volume has been mounted in advance.)
Answer:
Explanation:
see explanation below.
Explanation
# vgdisplay
(Check the capacity of vg, if the capacity is not enough, need to create pv , vgextend , lvextend)
# lvdisplay (Check lv)
# lvextend -L +110M /dev/vg2/lv2
# resize2fs /dev/vg2/lv2
mount -a
(Verify)
------------------------------------------------------------------------------- (Decrease lvm)
# umount /media
# fsck -f /dev/vg2/lv2
# resize2fs -f /dev/vg2/lv2 100M
# lvreduce -L 100M /dev/vg2/lv2
# mount -a
# lvdisplay (Verify)
OR
# e2fsck -f /dev/vg1/lvm02
# resize2fs -f /dev/vg1/lvm02
# mount /dev/vg1/lvm01 /mnt
# lvreduce -L 1G -n /dev/vg1/lvm02
# lvdisplay (Verify)
NEW QUESTION # 48
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 # 49
Open kmcrl value of 5 , and can verify in /proc/ cmdline
Answer:
Explanation:
# vim /boot/grub/grub.conf
kernel/vmlinuz-2.6.32-71.el6.x86_64 ro root=/dev/mapper/GLSvg-GLSrootrd_LVM_LV=GLSvg/GLSroot rd_LVM_LV=GLSvg/GLSswaprd_NO_LUKSrd_NO_MDrd_NO_DM LANG=en_US.UTF-8 SYSFONT=latarcyrheb-sun16 KEYBOARDTYPE=pc KEYTABLE=us crashkernel=auto rhgb quiet kmcrl=5 Restart to take effect and verification:
# cat /proc/cmdline
ro root=/dev/mapper/GLSvg-GLSroot rd_LVM_LV=GLSvg/GLSroot rd_LVM_LV=GLSvg/GLSswap rd_NO_LUKS rd_NO_MD rd_NO_DM LANG=en_US.UTF-8 SYSFONT=latarcyrheb-sun16 KEYBOARDTYPE=pc KEYTABLE=us rhgb quiet kmcrl=5
NEW QUESTION # 50
......
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