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| Section | Objectives |
|---|---|
| Topic 1: Manage security | - Manage default file permissions - Configure firewall settings using firewall-cmd and firewalld - Manage SELinux port labels - Use Boolean settings to modify SELinux settings - List and identify SELinux file and process contexts - Set enforcing and permissive modes for SELinux - Restore default file contexts - Configure key-based authentication for SSH |
| Topic 2: Operate running systems | - Boot, reboot, and shut down a system normally - Manage tuning profiles - Adjust process scheduling - Preserve system journals - Securely transfer files between systems - Boot systems into different targets manually - Identify CPU and memory intensive processes and kill processes - 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 |
| Topic 3: Deploy, configure, and maintain systems | - Schedule tasks using at, cron, and systemd timer units - Install and update software packages - Start and stop services and configure services to start automatically at boot - Configure systems to boot into a specific target automatically - Modify the system bootloader - Configure time service clients |
| Topic 4: Configure local storage | - Assign physical volumes to volume groups - Create and delete logical volumes - Create and remove physical volumes - Add new partitions, logical volumes, and swap non-destructively - Configure systems to mount file systems at boot by UUID or label - List, create, and delete partitions on GPT disks |
| Topic 5: Manage basic networking | - Restrict network access using firewalld and firewall-cmd - Configure IPv4 and IPv6 addresses - Configure network services to start automatically at boot - Configure hostname resolution |
| Topic 6: Manage users and groups | - Create, delete, and modify local user accounts - Change passwords and adjust password aging for local users - Configure privileged access - Create, delete, and modify local groups and group memberships |
| Topic 7: 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 |
| Topic 8: Manage software | - Configure access to RPM repositories - Install and remove RPM software packages - Configure access to Flatpak repositories - Install and remove Flatpak software packages |
| Topic 9: Create and configure file systems | - Extend existing logical volumes - Diagnose and correct file permission problems - Configure autofs - Mount and unmount network file systems using NFS - Create, mount, unmount, and use VFAT, ext4, and XFS file systems |
| Topic 10: Understand and use essential tools | - Use input-output redirection - Use grep and regular expressions to analyze text - Access a shell prompt and issue commands with correct syntax - Archive, compress, unpack, and uncompress files using tar, gzip, and bzip2 - Create and edit text files - Create, delete, copy, and move files and directories - Locate, read, and use system documentation - Access remote systems using SSH - List, set, and change standard ugo/rwx permissions - Log in and switch users in multi-user targets - Create hard and soft links |
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NEW QUESTION # 37
According the following requirements to create a local directory /common/admin.
* This directory has admin group.
* This directory has read, write and execute permissions for all admin group members.
* Other groups and users don't have any permissions.
* All the documents or directories created in the/common/admin are automatically inherit the admin group.
Answer:
Explanation:
see explanation below.
Explanation
mkdir -p /common/admin
chgrp admin /common/admin
chmod 2770 /common/admin
NEW QUESTION # 38
Open kmcrl value of 5 , and can verify in /proc/ cmdline
Answer:
Explanation:
see explanation below.
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 # 39
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:
Answer see in the explanation.
Explanation/Reference:
# 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 # 40
Which security issues exist for most publicly available Vagrant boxes? (Choose three correct answers.)
Answer: A,D,E
Explanation:
Explanation/Reference:
Reference https://www.vagrantup.com/docs/boxes/base.html
NEW QUESTION # 41
Copy /etc/fstab document to /var/TMP directory. According the following requirements to configure the permission of this document.
* The owner of this document must be root.
* This document belongs to root group.
* User mary have read and write permissions for this document.
* User alice have read and execute permissions for this document.
* Create user named bob, set uid is 1000. Bob have read and write permissions for this document.
* All users has read permission for this document in the system.
Answer:
Explanation:
see explanation below.
Explanation
cp /etc/fstab /var/tmp
chown root:root /var/tmp/fstab
chmod a-x /var/tmp/fstab
setfacl -m u:mary:rw /var/tmp/fstab
setfacl -m u:alice:rx /var/tmp/fstab
useradd -u 1000 bob
NEW QUESTION # 42
......
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