boot – The GNU GRUB screen no longer loads Ubuntu OS

I worked well with Ubuntu, but one day, when I restarted it, it froze the Lap return to the GNU GRUB screen (the purple one), where there are only 3 options: Ubuntu / Advanced option for Ubuntu / System -Set up.
When I press Ubuntu, the screen freezes on the purple screen like it's being charged, but it can stay like that for hours.
I did not create a backup. What are the commands to restore my data?

PHP – Intermittent slow page loads [RedHat, Apache, CodeIgniter Stack]

I've been racking my brain in the last few days and it seems my life is financing the culprit for this problem. At some point in the last week, a page was suddenly loaded on our intranet site to handle the reporting.

Background / Context:

Red hat

Apache 2.2.3
PHP 5.3

Running a CodeIgniter installation

This site queries a local MySQL database and an external Oracle database. I have enabled CodeIgniter profiling, and when the page is finally loaded for the client / user, all queries are returned in milliseconds. (Both for MySQL queries (local to the server) and for Oracle queries (separate external DB server).

I can not repeat the delay / time to delay the first byte each time the page reloads. But every nth update happens. Sometimes I get away with 50+ without any problems. Sometimes, restarting httpd fixes the problem for a short time, but even with only 8 child processes created (and not consuming too much memory), I can reproduce the problem.

As I understand it, we use prefork for our MPM because the ps aux return indicates that it was started as usr / sbin / httpd.

I have a fairly limited knowledge of all this, so I try my best.

Although this server is running cron jobs, I have certainly replicated it to a duplicated server without the cron jobs. (Aswell as a lot less load)

When I use some debugging checkpoints, there is no execution delay during code compilation / CodeIgniter PHP controller. I have 6 benchmarks that test execution time to return to view. They all come back in milliseconds. Seems like something is delaying the time to the first byte.

When I asked our network team, they had apparently indicated that the server did not hand out the cookie on slow requests.

I'm not sure if this is related to CodeIgniter, the network, and so on.

I ran some STRACES of the Apache processes during a fast and a slow load. There is a full list of running Apache processes, Apache configuration with modules, slow and fast PCAP Wireshark network traces on the site, and a server status screenshot (see below).

Here is the zip file with all the possible diagnostic information that I can provide to help with this problem.

https://gofile.io/?c=ddNqZ5

Any help is greatly appreciated.

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Customization – Create a page that loads data dynamically

I would like to create a page that dynamically loads data into "sections" much like eBay loads its offers (see below):

Enter image description here

As you can see, I highlighted each section in red. Is there a way to achieve this in WordPress? I currently have Elementor Pro installed and hoped that there would be a widget that offered this functionality, but I still need to find something.

The Ubuntu 18.04 boot will start flashing when the NVIDIA persistence daemon loads and the c3 session of the gdm user starts

I've been using Ubuntu 18.04 for my machine / in-depth learning and have had issues with getting the NVIDIA drivers to work with Ubuntu loading in the past. I have never enabled the graphical login for use with nvidia drivers. So I deactivated it first and logged in on a black screen with my encrypted password. After that, the graphical user interface is loaded and I can log in to my account. I am new to Linux in general and therefore generally only follow the advice I find on this site when I come across a mistake.

Starting this morning, after entering the encryption password, you will have the following startup options:

# Start NVIDIA persistence daemon [OK] Launched the NVIDIA persistence daemon [OK] Launched session c3 of user gdm & # 39;

and then the screen just flashes black and back to the text and repeats this cycle. I tried pressing Alt + F2 to log in this way, but I can type in one letter before blinking and reset myself twice.

Other information:

1) Ubuntu PostgreSQL Cluster @ 10-main and 9.5 main can not boot while booting (I have not seen that before)

2) When last night's shutdown, there was a problem running a stop job (time / unlimited) that I just ignored.

Any suggestions for rectification?

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Nginx loads certificate files based on the host

I want to provide the correct SSL certificate based on the $ host variable, with the exception that a host is * .mydomain.com or mydomain.com

The certificates fall into two groups:

  1. Local Certificates: * .mydomain.com mydomain.com
  2. External certificates: www.user1.com www.user2.com

It's important to know that www.user1.com and www.user2.com are set up with CNAME to point to user1.mydomain.com and user2.mydomain.com, meaning that they are intercepted by the same server scope who processes *. mydomain.com, but the value of $ host remains www.user1.com or www.user2.com. That means I have to take care of it in a server block.

Based on that, I want to have an if statement that checks if the $ host variable is a subdomain of * .mydomain.com or mydomain.com and loads my certificate. If not, I would like to check if a user's certificate exists in / etc / $ host / certificate and load that.

I know Nginx vaguely and have read about aversion to if statements. Now I'm wondering how to do it the best. I have done a lot and this last step is exactly what is left.

boot – Ubuntu 18.04 loads to false TTY

I installed Ubuntu 18.04, it worked fine and an application did not work anymore. So I reinstalled it and when booting, the background appeared without a mouse or icons. Links worked. I reinstalled Ubuntu 18.04 again and the problem persisted. Luckily, I've found that I can just put Ctrl + Alt + F2 in the desktop environment and everything works from there.

I'm just curious what's going on.

How can I configure apparmor so that mariadb loads a shared library?

After a routine update yesterday MariaDB was not started because a shared library file is not loaded because it is blocked by Apparmor.

Here is the output of journalctl -xe

Apr 17 11:44:45 pbts-academic exam[10349]: AVC apparmor = "DENIED" operation = "file_mmap" profile = "/ usr / sbin / mysqld" name = "/ usr / lib / x86_64-linux-gnu / liblz4.so.1.7.1"
Apr 17 11:44:45 pbts-academic kernel: audit: type = 1400 audit (1555472685.956: 79): apparmor = "DENIED" operation = "file_mmap" profile = "/ usr / sbin / mysqld" name = "/ usr / lib / x86_64-linux-gnu / liblz4.so.1.7.1 "
Apr 17 11:44:45 pbts-academic mysqld[10349]: / usr / sbin / mysqld: Failed to load shared libraries: liblz4.so.1: Segment could not be allocated from shared objects
Apr. 17 11:44:45 pbts academic system[1]: mariadb.service: Main process has ended, code = stopped, status = 127 / n / a
Apr. 17 11:44:45 pbts academic system[1]: mariadb.service: error on result - exit-code & # 39 ;.
Apr. 17 11:44:45 pbts academic system[1]: Error while starting the database server from MariaDB 10.3.14.
- Subject: Unit mariadb.service failed
- Defined by: systemd
- Support: http://www.ubuntu.com/support
-
- Device mariadb.service failed.
-
- The result is RESULT.

Thank you in advance.