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| Section | Objectives |
|---|---|
| Storage Management | - Disk and filesystem administration
|
| Essential Commands | - Command-line operations
|
| User and Group Management | - Account administration
|
| Networking | - Network configuration
|
| Security | - System security fundamentals
|
| Operation of Running Systems | - System management
|
| Service Configuration | - Common services
|
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NEW QUESTION # 174
Context
The system's clock has drifted due to the absence of time synchronization.
Task
Manually and one-off synchronize the system's clock with timeservers in pool.ntp.org.
There is no need to update the hardware clock; the system is configured to do that at shutdown.
Do not configure automatic time synchronization.
Answer:
Explanation:
See the complete solution in Explanation.
Explanation:
Objective: Correct the Linux system clock by performing a one-time synchronization against NTP servers from pool.ntp.org, without enabling continuous or automatic time synchronization and without modifying the hardware clock.
The video shows the candidate successfully executing:
sudo ntpdate pool.ntp.org
This is a valid solution. The terminal output confirms that the system clock was adjusted using an NTP server.
The official Ubuntu ntpdate(8) documentation confirms that ntpdate can synchronize the system clock manually without establishing an ongoing synchronization service.
Ubuntu Manpages
Step 1: Connect to the correct Linux server.
The video specifies host lfcs00103.
From the candidate terminal, execute:
ssh lfcs00103
This establishes an SSH session with the server whose system clock requires correction.
All subsequent commands must be executed on this host.
Step 2: Inspect the current system date and time.
Execute:
date
This displays the system's current local date and time.
For UTC:
date -u
The -u option displays the system time in Coordinated Universal Time.
Record the initial date and time so you can compare the system clock before and after synchronization.
The task states that the system clock has drifted. Therefore, its displayed time may differ significantly from the actual time reported by NTP servers.
Step 3: Check the current time synchronization status.
Execute:
timedatectl status
This displays information such as:
Local time.
Universal time.
RTC (hardware clock) time.
Configured timezone.
Whether an NTP synchronization service is active.
Whether the system reports its clock as synchronized.
An illustrative output is:
Local time: Sat 2026-10-03 11:30:00 UTC
Universal time: Sat 2026-10-03 11:30:00 UTC
RTC time: Sat 2026-10-03 11:30:00
Time zone: Etc/UTC (UTC, +0000)
System clock synchronized: no
NTP service: inactive
These values are illustrative rather than the actual output from the video.
Since the question asks for manual one-time synchronization, there is no need to configure an automatic NTP service.
Step 4: Verify that the ntpdate utility is available.
Execute:
command -v ntpdate
If installed, this command displays its executable path.
For example:
/usr/sbin/ntpdate
You can inspect the utility's manual:
man ntpdate
The task's demonstrated environment already has ntpdate available.
Therefore, installing additional software is unnecessary.
Step 5: Verify hostname resolution for the NTP server pool.
The task specifies:
pool.ntp.org
Check that the hostname resolves:
getent ahosts pool.ntp.org
This should return IP addresses associated with the NTP pool.
pool.ntp.org is a DNS-based collection of public NTP servers rather than one fixed machine.
Using the pool allows the time client to obtain available servers without manually specifying individual server addresses.
A successful synchronization also requires network connectivity to an NTP server, normally using UDP port
123.
Step 6: Check for an existing time synchronization daemon if necessary.
Execute:
systemctl is-active systemd-timesyncd
systemctl is-active chrony
systemctl is-active ntp
Some services may not be installed, so an inactive, unknown, or unit-not-found result is possible.
The task says not to configure automatic synchronization. It does not require enabling any of these services.
If an existing synchronization daemon interferes with a one-time adjustment, investigate and handle that conflict without unnecessarily modifying its persistent configuration.
Do not enable a daemon merely to synchronize the clock once.
Step 7: Synchronize the system clock manually using ntpdate.
Execute the primary solution:
sudo ntpdate pool.ntp.org
This is the command demonstrated in the video.
Command component
Purpose
sudo
Grants privileges to modify the system clock
ntpdate
Queries NTP servers and adjusts the local system clock
pool.ntp.org
Specifies the requested NTP server pool
The utility contacts NTP servers, estimates the difference between the local clock and server time, and corrects the local clock.
Depending on the implementation and magnitude of the error, it may step or slew the clock.
A step changes the displayed system time immediately. A slew changes the clock gradually.
The ntpdate manual documents the clock-setting behavior and the difference between querying and updating the clock.
Ubuntu Manpages
Step 8: Examine the synchronization output.
The recording shows that the ntpdate command corrected a substantial clock error.
The terminal includes a successful adjustment message of the form:
CLOCK: time stepped by 37212257.308748
It also reports that the system clock moved from an incorrect date in July 2025 to October 3, 2026.
This is significant because it confirms that the command did more than merely query an NTP server: it actually changed the system clock.
Your terminal output will depend on the clock's actual drift when the command runs.
A small drift may result in a different adjustment message.
Step 9: Verify the command's exit status.
Immediately after the synchronization command completes, execute:
echo $?
Expected:
0
The official ntpdate documentation specifies that a zero exit status indicates a successful clock update.
Ubuntu Manpages
A nonzero status indicates that the operation failed.
If the operation fails, investigate the actual error rather than assuming that the clock has been corrected.
Possible issues include unavailable DNS resolution, unreachable NTP servers, firewall restrictions, or interference from another time synchronization process.
Step 10: Verify the corrected system time.
Execute:
date
Then:
date -u
These commands display the system time after the NTP adjustment.
Compare the new values with the values recorded before synchronization.
The corrected clock should be consistent with the time reported by the selected NTP servers.
Step 11: Optionally check the remaining time offset without changing the clock.
Execute:
sudo ntpdate -q pool.ntp.org
The -q option means query only.
It obtains time information and reports the estimated offset without setting the clock.
This is useful after synchronization because it allows you to check whether the remaining clock difference is small.
Do not confuse:
sudo ntpdate -q pool.ntp.org
with:
sudo ntpdate pool.ntp.org
The first command queries only; the second performs the requested clock adjustment.
A small reported offset provides supporting evidence that the local clock is close to the NTP reference time.
Step 12: Do not configure automatic synchronization.
The task explicitly states:
Do not configure automatic time synchronization.
Therefore, do not enable a continuous time synchronization service as part of the solution.
For example, avoid:
sudo timedatectl set-ntp true
Also avoid enabling a daemon solely for this task:
sudo systemctl enable --now chrony
Likewise, do not create a cron job that runs ntpdate periodically.
These operations would establish ongoing synchronization behavior rather than performing the required one- time adjustment.
The command:
sudo ntpdate pool.ntp.org
already satisfies the one-time synchronization requirement when it completes successfully.
Step 13: Do not manually update the hardware clock.
Linux maintains two conceptually distinct clocks:
Clock
Description
System clock
Kernel-maintained clock used by running applications
Hardware clock (RTC)
Battery-backed or virtualized real-time clock used across system restarts The task specifically instructs that the hardware clock does not need to be updated.
Therefore, do not execute:
sudo hwclock --systohc
This command copies the system clock to the hardware clock and is unnecessary for the task.
The exam environment is already configured to perform the appropriate hardware-clock update during shutdown.
Step 14: Do not modify persistent NTP configuration files.
The task does not require editing files such as:
/etc/chrony/chrony.conf
/etc/systemd/timesyncd.conf
/etc/ntp.conf
These files belong to time synchronization service configurations and are unrelated to the required manual one-time operation.
There is also no requirement to change the timezone.
Step 15: Verify the system status after synchronization.
Execute:
timedatectl status
Inspect the system time.
One important technical detail: after a manual ntpdate adjustment, timedatectl may still report:
System clock synchronized: no
This does not necessarily mean the one-time NTP adjustment failed.
That status may depend on whether a running time synchronization service or the kernel's synchronization status has marked the clock as synchronized.
For this task, rely primarily on the successful ntpdate execution, the resulting clock adjustment, and an optional read-only NTP offset check.
Do not enable automatic synchronization simply to change the timedatectl status.
Step 16: Alternative solution if ntpdate is unavailable.
If the host provides Chrony instead of ntpdate, the officially documented one-time synchronization command is:
sudo chronyd -q 'pool pool.ntp.org iburst'
chronyd is Chrony's time synchronization program.
-q instructs it to set the system clock once and exit.
pool pool.ntp.org selects servers from the specified NTP pool.
iburst performs an initial burst of requests for quicker synchronization.
This is the alternative recommended by Ubuntu's current time synchronization documentation.
Frequently Asked Questions
+1
Use this alternative only if appropriate for the installed environment. If another Chrony daemon is already running, avoid launching a competing clock controller without resolving that conflict.
For the environment demonstrated in the supplied video, ntpdate is available and is the simpler, directly demonstrated solution.
Step 17: Perform final verification.
Execute:
date -u
Confirm the corrected system time.
If needed, check the NTP offset without changing the clock:
sudo ntpdate -q pool.ntp.org
The completed task should satisfy:
Requirement
Expected result
Correct host
lfcs00103
NTP server pool
pool.ntp.org
System clock synchronized once
Yes
Method
Manual NTP adjustment
Automatic synchronization configured
No
Hardware clock manually changed
No
Clock adjustment
Successful
Final Solution
The essential commands are:
# Connect to the designated server
ssh lfcs00103
# Check the current system time
date -u
# Perform one-time synchronization
sudo ntpdate pool.ntp.org
# Verify the corrected time
date -u
# Optional: query the remaining offset without modifying the clock
sudo ntpdate -q pool.ntp.org
The single command that performs the requested adjustment is:
sudo ntpdate pool.ntp.org
Technical Verification and References
Ubuntu ntpdate(8) Manual
- Documents one-time clock synchronization, query-only mode and exit status.
Chrony Official FAQ
- Documents chronyd -q for one-time clock synchronization.
Ubuntu Server - Time Synchronization
- Explains NTP, Chrony and one-shot synchronization.
Video verification finding: At approximately 30:30-30:46, the candidate connects to lfcs00103 and executes sudo ntpdate pool.ntp.org. The terminal displays a successful clock-step operation, correcting a large time difference. No continuous synchronization service or hardware-clock modification is shown.
Expected result: The system clock on lfcs00103 is corrected through a single NTP synchronization against pool.ntp.org. No automatic time synchronization is configured, and the hardware clock is left unchanged.
next batch now
NEW QUESTION # 175
How can the normal output of a command be written to a file while discarding the error output?
Answer: B
NEW QUESTION # 176
Each entry in a crontab must end with what character?
Answer: C
NEW QUESTION # 177
Which character in the password field of /etc/passwd is used to indicate that the encrypted password is stored in /etc/shadow?
Answer: D
NEW QUESTION # 178
What is the purpose of the command mailq?
Answer: C
Explanation:
Explanation/Reference:
NEW QUESTION # 179
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