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| Section | Objectives |
|---|---|
| Understand and use essential tools | - List, set, and change standard ugo/rwx permissions - Use grep and regular expressions to analyze text - Create, delete, copy, and move files and directories - Locate, read, and use system documentation - Use input-output redirection - Access a shell prompt and issue commands with correct syntax - Archive, compress, unpack, and uncompress files using tar, gzip, and bzip2 - Access remote systems using SSH - Log in and switch users in multi-user targets - Create hard and soft links - Create and edit text files |
| Operate running systems | - Start, stop, and check the status of network services - Securely transfer files between systems - Interrupt the boot process to gain access to a system - Identify CPU and memory intensive processes and kill processes - Locate and interpret system log files and journals - Boot systems into different targets manually - Adjust process scheduling - Manage tuning profiles - Boot, reboot, and shut down a system normally - Preserve system journals |
| Deploy, configure, and maintain systems | - Install and update software packages - Modify the system bootloader - Configure time service clients - Configure systems to boot into a specific target automatically - Schedule tasks using at, cron, and systemd timer units - Start and stop services and configure services to start automatically at boot |
| Manage security | - Manage SELinux port labels - List and identify SELinux file and process contexts - Configure firewall settings using firewall-cmd and firewalld - Use Boolean settings to modify SELinux settings - Configure key-based authentication for SSH - Manage default file permissions - Restore default file contexts - Set enforcing and permissive modes for SELinux |
| Manage software | - Configure access to RPM repositories - Configure access to Flatpak repositories - Install and remove RPM software packages - Install and remove Flatpak software packages |
| Configure local storage | - Create and delete logical volumes - Configure systems to mount file systems at boot by UUID or label - List, create, and delete partitions on GPT disks - Assign physical volumes to volume groups - Add new partitions, logical volumes, and swap non-destructively - Create and remove physical volumes |
| Manage basic networking | - Configure IPv4 and IPv6 addresses - Configure hostname resolution - Configure network services to start automatically at boot - Restrict network access using firewalld and firewall-cmd |
| Create simple shell scripts | - Conditionally execute code - Process output of shell commands within a script - Use looping constructs to process files and command-line input - Process script inputs |
| Create and configure file systems | - Create, mount, unmount, and use VFAT, ext4, and XFS file systems - Extend existing logical volumes - Configure autofs - Mount and unmount network file systems using NFS - Diagnose and correct file permission problems |
| Manage users and groups | - Create, delete, and modify local user accounts - Configure privileged access - Change passwords and adjust password aging for local users - Create, delete, and modify local groups and group memberships |
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NEW QUESTION # 66
Debugging SELinux
A web server running on non-standard port 82 encounters issues while serving content. Debug and resolve the problem to meet the following conditions:
- The web server on the system can serve HTML files hosted in /var/www/html (Note: Do not delete or modify existing file contents)
- The web server can serve content on port 82
- The web server can start automatically at system boot
Answer:
Explanation:
Solution:
# Check which package provides the semanage command
[root@node1 ~]# yum provides "*/semanage"
# Install the semanage command
[root@node1 ~]# yum -y install policycoreutils-python-utils
[root@node1 ~]# semanage port -l |grep http
[root@node1 ~]# semanage port -a -t http_port_t -p tcp 82
# Alternatively, you can use man semanage port, then search for EXAMPLE.
[root@node1 ~]# systemctl restart httpd
[root@node1 ~]# systemctl enable httpd
# Verification, seeing the source code indicates correctness (mandatory operation)
[root@node1 ~]# curl http://node1.domain250.example.com:82
NEW QUESTION # 67
One Package named zsh is dump on ftp://server1.example.com under /pub/updates directory and your FTP server is 192.168.0.254. Install the package zsh.
Answer:
Explanation:
rpm -ivh ftp://server1/example.com/pub/updates/zsh-*
or
Login to ftp server : ftp ftp://server1.example.com using anonymous user.
Change the directory: cd pub and cd updates
Download the package: mget zsh-*
Quit from the ftp prompt : bye
Install the package
rpm -ivh zsh-*
Verify either package is installed or not : rpm -q zsh
NEW QUESTION # 68
06. Create a Collaborative Directory
Create a shared directory /home/managers with the following characteristics:
- The group ownership of /home/managers is sysmgrs.
- The directory should be readable, writable, and executable by members of the sysmgrs group, but should not have read or write permissions for any other users
(of course, the root user has access to all files and folders).
- Any files created within /home/managers should automatically inherit the group ownership set to the sysmgrs group.
Answer:
Explanation:
Solution:
[root@node1 ~]# mkdir /home/managers
[root@node1 ~]# chgrp sysmgrs /home/managers
[root@node1 ~]# chmod 2770 /home/managers
# Verification
[root@node1 ~]# ll -d /home/managers
NEW QUESTION # 69
SIMULATION
One Logical Volume is created named as myvol under vo volume group and is mounted. The Initial Size of that Logical Volume is 400MB. Make successfully that the size of Logical Volume 200MB without losing any data. The size of logical volume 200MB to 210MB will be acceptable.
Answer:
Explanation:
See explanation below.
Explanation/Reference:
Explanation:
First check the size of Logical Volume: lvdisplay /dev/vo/myvol
Make sure that the filesystem is in a consistent state before reducing:
# fsck -f /dev/vo/myvol
Now reduce the filesystem by 200MB.
# resize2fs /dev/vo/myvol 200M
It is now possible to reduce the logical volume. #lvreduce /dev/vo/myvol -L 200M Verify the Size of Logical Volume: lvdisplay /dev/vo/myvol Verify that the size comes in online or not: df -h
NEW QUESTION # 70
Part 2 (on Node2 Server)
Task 6 [Implementing Advanced Storage Features]
Add a new disk to your virtual machine with a ize of 10 GiB
On this disk, create a VDO volume with a size of 50 GiB and mount it persistently on /vbread with xfs filesystem
Answer:
Explanation:
* [root@node2 ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
vdd 252:48 0 5G 0 disk
vde 252:64 0 10G 0 disk
[root@node2 ~]# yum install kmod-kvdo vdo
[root@node2 ~]# systemctl enable --now vdo
[root@node2 ~]# systemctl start vdo
[root@node2 ~]# systemctl status vdo
[root@node2 ~]# vdo create --name=vdo1 --device=/dev/vde --vdoLogicalSize=50G
[root@node2 ~]# vdostats --hu
Device Size Used Available Use% Space saving%
/dev/mapper/vdo1 10.0G 4.0G 6.0G 40% N/A
[root@node2 ~]# mkfs.xfs -K /dev/mapper/vdo1
* [root@node2 ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
vde 252:64 0 10G 0 disk
└─vdo1 253:4 0 50G 0 vdo
[root@node2 ~]# mkdir /vbread
[root@node2 ~]# blkid
/dev/mapper/vdo1: UUID="1ec7a341-6051-4aed-8a2c-4d2d61833227" BLOCK_SIZE="4096" TYPE="xfs"
[root@node2 ~]# vim /etc/fstab
UUID=1ec7a341-6051-4aed-8a2c-4d2d61833227 /vbread xfs defaults,x-systemd.requires=vdo.service 0 0
[root@node2 ~]# mount /dev/mapper/vdo1 /vbread/
[root@node2 ~]# df -hT
Filesystem Type Size Used Avail Use% Mounted on
/dev/mapper/vdo1 xfs 50G 390M 50G 1% /vbread
NEW QUESTION # 71
......
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