All Questions(server)

For the aws EC2 and aliyun instances or other similar cloud computing services, is the VM guaranteed to run on the same physical machine each time you launch it, or it may migrate from one physical machine to another?

Also I know hypervisors support live migration, so is it possible that my running aws/aliyun instance migrated by the service provider, which may cause a short time outage or unresponsiveness.

Here is the reason for my question: I have a aliyun server collecting realtime data packets stream from another aws server. Each packet has a sender timestamp tag. At the receiver side, receiver uses the (current_local_timestamp - sender_timestamp) to get the elapsed time. Usually this elapsed time is around 30~50ms, sometimes ~100ms. But in the extreme cases, this elapsed time can go up to a few seconds or even more than 1 minutes, this case happens at least 2~3 times a month, often at Friday (but not always) or some holidays.

I'm trying to figuring out the reason for the extreme large transport delay.

I'm trying to disallow the basic 80 HTTP server to be at the root of my dynamic DNS, but instead use a subdirectory.

so instead of blabla.dynamicdns.org it won't be served but at blabla.dynamicdns.org/service it would be.

This configuration attempt did not work. Says document roots are not allowed in Directory tags.

I know how much SE loves its examples, I'm dumping this otherwise vanilla config here anyway.

I literally know nothing and I literally need to be spoon-fed here and it's a pill to Google for this.

<VirtualHost *:80>
    # The ServerName directive sets the request scheme, hostname and port that
    # the server uses to identify itself. This is used when creating
    # redirection URLs. In the context of virtual hosts, the ServerName
    # specifies what hostname must appear in the request's Host: header to
    # match this virtual host. For the default virtual host (this file) this
    # value is not decisive as it is used as a last resort host regardless.
    # However, you must set it for any further virtual host explicitly.
    #ServerName www.example.com

    ServerAdmin webmaster@localhost


    # Available loglevels: trace8, ..., trace1, debug, info, notice, warn,
    # error, crit, alert, emerg.
    # It is also possible to configure the loglevel for particular
    # modules, e.g.
    #LogLevel info ssl:warn
    <Directory /var/www/html/ampache/>
    DocumentRoot /var/www/html/ampache
    DocumentRoot /var/www/html/ampache/public
    </Directory>

    ErrorLog ${APACHE_LOG_DIR}/error.log
    CustomLog ${APACHE_LOG_DIR}/access.log combined

    # For most configuration files from conf-available/, which are
    # enabled or disabled at a global level, it is possible to
    # include a line for only one particular virtual host. For example the
    # following line enables the CGI configuration for this host only
    # after it has been globally disabled with "a2disconf".
    #Include conf-available/serve-cgi-bin.conf
</VirtualHost>

A more correct config, that still does not yield my desired result:

<VirtualHost *:80>
    # The ServerName directive sets the request scheme, hostname and port that
    # the server uses to identify itself. This is used when creating
    # redirection URLs. In the context of virtual hosts, the ServerName
    # specifies what hostname must appear in the request's Host: header to
    # match this virtual host. For the default virtual host (this file) this
    # value is not decisive as it is used as a last resort host regardless.
    # However, you must set it for any further virtual host explicitly.
    #ServerName www.example.com

    ServerAdmin webmaster@localhost
    DocumentRoot /var/www/html/ampache
    DocumentRoot /var/www/html/ampache/public

    # Available loglevels: trace8, ..., trace1, debug, info, notice, warn,
    # error, crit, alert, emerg.
    # It is also possible to configure the loglevel for particular
    # modules, e.g.
    #LogLevel info ssl:warn

    ErrorLog ${APACHE_LOG_DIR}/error.log
    CustomLog ${APACHE_LOG_DIR}/access.log combined

    # For most configuration files from conf-available/, which are
    # enabled or disabled at a global level, it is possible to
    # include a line for only one particular virtual host. For example the
    # following line enables the CGI configuration for this host only
    # after it has been globally disabled with "a2disconf".
    #Include conf-available/serve-cgi-bin.conf
</VirtualHost>

Sorry for this de facto spam, but my history with SE and lust for "working examples" on topics I don't even know how they work, has forced my hand.

i had updated ubuntu 22.04 -- >> 24.04 now getting this error while phpmyadmin getting not loaded into browser

Mon Sep 23 18:30:18.060029 2024] [php:error] [pid 11672] [client 192.168.1.150:54278] PHP Fatal error:  Uncaught TypeError: PhpMyAdmin\\Menu::__construct(): Argument #1 ($dbi) must be of type PhpMyAdmin\\DatabaseInterface, null given, called in /usr/share/phpmyadmin/libraries/classes/Header.php on line 114 and defined in /usr/share/phpmyadmin/libraries/classes/Menu.php:57\nStack trace:\n#0 /usr/share/phpmyadmin/libraries/classes/Header.php(114): PhpMyAdmin\\Menu->__construct()\n#1 /usr/share/phpmyadmin/libraries/classes/ResponseRenderer.php(168): PhpMyAdmin\\Header->__construct()\n#2 /usr/share/phpmyadmin/libraries/classes/ResponseRenderer.php(199): PhpMyAdmin\\ResponseRenderer->__construct()\n#3 /usr/share/phpmyadmin/libraries/classes/ErrorHandler.php(335): PhpMyAdmin\\ResponseRenderer::getInstance()\n#4 /usr/share/phpmyadmin/libraries/classes/ErrorHandler.php(307): PhpMyAdmin\\ErrorHandler->dispFatalError()\n#5 /usr/share/phpmyadmin/libraries/classes/ErrorHandler.php(237): PhpMyAdmin\\ErrorHandler->addError()\n#6 [internal function]: PhpMyAdmin\\ErrorHandler->handleException()\n#7 {main}\n  thrown in /usr/share/phpmyadmin/libraries/classes/Menu.php on line 57
[Mon Sep 23 18:30:18.060184 2024] [php:error] [pid 11672] [client 192.168.1.150:54278] PHP Fatal error:  Uncaught Error: Call to a member function getDisplay() on null in /usr/share/phpmyadmin/libraries/classes/ResponseRenderer.php:293\nStack trace:\n#0 /usr/share/phpmyadmin/libraries/classes/ResponseRenderer.php(411): PhpMyAdmin\\ResponseRenderer->getDisplay()\n#1 [internal function]: PhpMyAdmin\\ResponseRenderer->response()\n#2 {main}\n  thrown in /usr/share/phpmyadmin/libraries/classes/ResponseRenderer.php on line 293

tried all measures finding it online.

Earlier we were using php7.4 now we have set php8.3 (so when php7.4 was not allowing even to load the website) but PHP v8.3 atleast allowing us to connect to site and load it in browser (Since this is updated)

but when we do http://192.168.1.100/phpmyadmin/ (or localhost/phpmyadmin)

This page isn’t working 192.168.1.100 is currently unable to handle this request. HTTP ERROR 500

Can someone help us?

We are getting notifications of two CA's expiring in pfSense - shown below in a yellow colour:

These are:

• Acmecert: O=(STAGING) Internet Security Research Group, CN=(STAGING) Pretend Pear X1, C=US
• Acmecert: O=Internet Security Research Group, CN=ISRG Root X1, C=US

I found a thread on Netgate's forum from extremely recently, which seems similar. It talks about X1 CA's, and the two that are expiring for us are also X1's.

There is no Renew button for these CA's.

Is it safe to delete these two CAs?

Afterwards how can we test that it has not caused any issues?

We are getting daily notifications:

I have an ip cam that records videos in a folder structure like this:

├── 2023
│   ├── 10
│   ├── 11
│   │   ├── cam_00_20240921153706.mp4
│   │   ├── cam_00_20240921153928.mp4
│   │   ├── cam_00_20240921164743.mp4
│   │   └── cam_00_20240921230558.mp4
│   └── 12
└── 2024
    ├── 08
    └── 09
        ├── 21
        │   ├── cam_00_20240921153706.mp4
        │   ├── cam_00_20240921153928.mp4
        │   ├── cam_00_20240921164743.mp4
        │   ├── cam_00_20240921230558.mp4
        │   └── cam_00_20240921230646.mp4
        └── 22
            ├── cam_00_20240922101839.mp4
            └── cam_00_20240922102150.mp4

Now I would like to delete all files that are older than 2 days, and all empty folders. To do this, I did

#delete files older than 2 days
find /recordings/????/??/?? -depth -type d -mtime +2 -exec rm -rf {} \;
#delete empty month dir
find /recordings/????/?? -depth -empty -type d -mtime +2 -exec rm -rf {} \;
#delete empty year dir
find /recordings/???? -depth -empty -type d -mtime +2 -exec rm -rf {} \;

Can this be done with a one liner? Or in a nicer way?