centos8 – CentOS 8 NTP: Chrony will not Sync with sources, timedatectl showing no sync but NTP active

I have been battling with Chrony for the last few hours and cannot seem to figure out what I’m doing wrong.
I found that my system time was set to 2015 when trying to activate Epel-release in DNF, some certificate errors lead me to trying to resolve time date issues. Below is all my relevant output:

    # timedatectl
               Local time: Wed 2021-05-05 16:24:27 EDT
           Universal time: Wed 2021-05-05 20:24:27 UTC
                 RTC time: Wed 2021-05-05 20:24:27
                Time zone: America/Detroit (EDT, -0400)
System clock synchronized: no
              NTP service: active
          RTC in local TZ: no

I had to set time manually, so this is actually one minute fast so that I could see if it ran correctly.

# chronyc sources
210 Number of sources = 4
MS Name/IP address         Stratum Poll Reach LastRx Last sample
^? ntp.speculation.org           0   9     0     -     +0ns(   +0ns) +/-    0ns
^? c-73-239-136-185.hsd1.wa>     0   9     0     -     +0ns(   +0ns) +/-    0ns
^?                0   9     0     -     +0ns(   +0ns) +/-    0ns
^? x.ns.gin.ntt.net              0   9     0     -     +0ns(   +0ns) +/-    0ns

# chronyc activity
200 OK
5 sources online
0 sources offline
0 sources doing burst (return to online)
0 sources doing burst (return to offline)
0 sources with unknown address

Looking at other people’s sources output this seems not only unrealistic, but just wrong

# systemctl stop chronyd

# chronyd -q
2021-05-05T20:31:16Z chronyd version 3.5 starting (+CMDMON +NTP +REFCLOCK +RTC +PRIVDROP +SCFILTER +SIGND +ASYNCDNS +SECHASH +IPV6 +DEBUG)
2021-05-05T20:31:16Z Frequency -97.480 +/- 1.274 ppm read from /var/lib/chrony/drift
2021-05-05T20:31:16Z Using right/UTC timezone to obtain leap second data
2021-05-05T20:31:27Z No suitable source for synchronisation
2021-05-05T20:31:27Z chronyd exiting

I’m not even sure where to start troubleshooting this, I have tried with and without firewalld running.

# cat /etc/chrony.conf
# Use public servers from the pool.ntp.org project.
# Please consider joining the pool (http://www.pool.ntp.org/join.html).
server 0.centos.pool.ntp.org iburst
server 1.centos.pool.ntp.org iburst
server 2.centos.pool.ntp.org iburst
server 3.centos.pool.ntp.org iburst
server 2.pool.ntp.org iburst
# Record the rate at which the system clock gains/losses time.
driftfile /var/lib/chrony/drift

# Allow the system clock to be stepped in the first three updates
# if its offset is larger than 1 second.
makestep 1.0 3

# Enable kernel synchronization of the real-time clock (RTC).

# Enable hardware timestamping on all interfaces that support it.
#hwtimestamp *

# Increase the minimum number of selectable sources required to adjust
# the system clock.
#minsources 2

# Allow NTP client access from local network.

# Serve time even if not synchronized to a time source.
#local stratum 10

# Specify file containing keys for NTP authentication.
keyfile /etc/chrony.keys

# Get TAI-UTC offset and leap seconds from the system tz database.
leapsectz right/UTC

# Specify directory for log files.
logdir /var/log/chrony

# Select which information is logged.
#log measurements statistics tracking

I have edited my conf files a ton, my pools might be a little weird but I wasn’t sure what else to have them set to. before this there was just 1 pool directive that I foolishly removed without backing up.

# ntpstat
poll interval unknown

Finally by suggestion of a friend, I used ntpstat and it gave me this output..

I have tried chronyc makestep and refresh, both of which have yielding nothing as well

is there any builtin system in unity to categorize audio sources and change volume of a category?

I need a centralized setting for audio, like volume changes. so I need to put all audio source components in the scene in different categories. I can make a system for it but maybe there is a standard simple way to do it unity. is there any way to categorize those audio sources and set their volume based on those groups or categories like music,vfx, etc…

aosp – How to update a self built LineageOS without redownloading/rebuilding all the sources?

I have been able to successfully build LineageOS 17.1 for my (unsupported officially) smartphone and I have self signed the build one month ago.
I would like to rebuild it with this month’s new updates, without having to redownload/rebuild everything that had not been changed.
To build it I did:

repo init -u git://github.com/LineageOS/android.git -b lineage-17.1
created .repo/local_manifests/roomservice.xml with all the device specific code
repo sync
Extracted the proprietary blobs
launched lunch to set up my device
make -j8 bacon
mka target-files-package otatools
signed the zip

What should I do to avoid fully redownloading and rebuilding everything? Is it enough running repo sync, mka target-files-package otatools and signing the new zip? Is there something I should do to clean up from the previous build?

Most efficient method to import bulk JSON data from different sources in postgresql?

I need to import data from thousands of URLs, here is an example of the data:


Since COPY doesn’t support JSON format, i’ve been using this to import the data from some of the URLs:

CREATE TEMP TABLE stage(x jsonb);

COPY stage FROM PROGRAM 'curl https://.....';

insert into test_table select f.* from stage,
   jsonb_populate_recordset(null::test_table, x) f;

But it is inefficient since it creates a table for every import and it imports a single url at a time.
I would like to know if it is possible (through a tool, script or command) to read a file with all the URLs and copy their data into the database.

Playing audio over bluetooth from some sources mutes others

Playing audio over bluetooth from some sources mutes others – Ask Different

installation – Sources disagree on hashes for supposely identical version when trying to install CUDA 11.2 toolkit

I am new to GPU computing and I am trying to install CUDA on my linux 20.04 focal with kernel 5.4.0 workstation that is equipped with NVIDIA quadro p4000 GPU.

I have followed the instructions in this link:


and when I did step 3.8 (sudo apt-get install cuda) I get this message:

Sources disagree on hashes for supposely identical version ‘11.2.2-1’ of ‘cuda-command-line-tools-11-2:amd64’
and when I tried nvcc –version after the installation finished with the above message and a few other similar messages I got nothing which means it didn’t install.

Actually I am trying to do the installation on a remote machine so I was not able to do any restarts during the installation if that is actually needed, because I don’t have access to the physical machine.

can you please help me figure out what is going wrong with my installation?

filters – What causes these horizontal lines from light sources?

It’s Lens Flare

Caused by light reflecting inside the lens body itself.
It was technically “a mistake” and something to be avoided until it actually became fashionable in the late 60s.

That particular type of flare is usually caused by an anamorphic lens, which is popular with cinematographers more than stills photographers. They’re used to create the wide screen imagery used in cinema. Amongst the side-effects is a propensity to flare in this horizontal pattern and also to create oval bokeh in out of focus areas. There is additional veiling flare which all lenses will demonstrate – causing the foggy appearance around light sources.
You could call this wrong or an error, but it has become a part of the playbook for cinema photography.

I watched the trailers on IMDB to see if I could spot more instances to determine if they did indeed use anamorphic lenses & I’d say they did, certainly for some of the shots.

Wide horizontal flare

enter image description here

Oval bokeh

enter image description here

There’s an easy guide to its use in cinema on YouTube – https://www.youtube.com/watch?v=_IesAvesFUo

These days it can be recreated in software – it’s built-in to Photoshop as a default plugin.

You can actually buy screw-in lens filters that attempt to recreate some of this look. Such as https://www.vid-atlantic.com/products/cinemorph which contains a lot of examples & demonstrations under the ‘buy me now’ advertising.

enter image description here

I actually own a lens which has been modded to add this structure inside the lens itself, rather than as an optional screw-on.

As a practical demonstration, here’s a quick snap of a torch (flashlight) sitting on the shelf above my computer (with an empty glass to stop it rolling away;)
You can see the characteristic (almost) horizontal line, some veiling flare around the torch itself & an additional reflection pattern lower left. There’s no bokeh example in this – I’d need a second light source off in the distance. This is all in purple/blue because that’s how this particular lens is designed.

enter image description here

Including point heat sources in a 2D transient PDE heat equation

I want to be sure that I included the point heat sources correctly in my PDE.
The result should be:
enter image description here

I wrote:

q0 = 1;
Subscript(Q, 0) = 
  q0*(DiracDelta(x - x1)*DiracDelta(y - y1) + 
     DiracDelta(x - x1)*DiracDelta(y - y2)*DiracDelta(x - x2)*
      DiracDelta(y - y1) + DiracDelta(x - x2)*DiracDelta(y - y2));
heqn1 = Subscript(k, 
    CLS)*(D(Subscript(T, D)(x, y, t), x, x) + 
      D(Subscript(T, D)(x, y, t), y, y)) + Subscript(Q, 0) == 
  Subscript((Rho), CLS)*Subscript(Cp, CLS)*
   D(Subscript(T, D)(x, y, t), t)

I haven’t considered the time-dependency for the heat source just yet to simplify the notation.
Thank you in advance!

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