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Filtering LinkedIn Posts, Notifications, and Comments by keyword

I use the uBlock Origin browser plugin to filter my LinkedIn Posts, Notifications, and Comments to hide anything containing objectionable topics. uBlock Origin allows you to add custom rules to block web content.

How to use and setup uBlock Origin is beyond the scope of this post. It's not hard, figure it out and then come back. What you want to know how to do is add your own custom rules.

Let's say, for purposes of these example, I want to block all mentions of someone named Grump.

The simplest version: block a single word

The following three rules hide Posts, Comments, and Notifications, respectively, that contain the word "grump", whether as a separate word, or as part of other words, such as "grumpier".

Posts: www.linkedin.com##div:has( > .ember-view.occludable-update:has(div.fie-impression-container:has-text(/grump/i)))
Comments: www.linkedin.com##.comments-replies-list > .comments-thread-entity > .comments-thread-item > .comments-comment-entity--reply.comments-comment-entity:has-text(/grump/i)
Notifications: www.linkedin.com##div[data-finite-scroll-hotkey-item]:has-text(/grump/i)

That's the basics. But…

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Workshop » Reference Section » Grimoires » IT » Platforms » Linux » Packages » PHP
Posted inIT Grimoire

How to monitor RAM for tuning pm.max_children

How to monitor RAM usage:

  1. free -h:

    • This command shows your system's total, used, and free memory in a human-readable format.
    • Key metrics:
      • total: Total RAM.
      • used: RAM currently in use.
      • free: Unused RAM.
      • buff/cache: RAM used for file system buffers and page cache. This is good; Linux uses free RAM for this and frees it when applications need it.
      • available: The most important metric. This estimates how much memory is available for starting new applications without swapping.
    • Run it before and after: Run free -h before you increase max_children and then after your server has been running for a while under typical load with the new settings. Compare the available memory.

  2. htop (recommended if installed):

    • htop (you might need to sudo…
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Workshop » Reference Section » Grimoires » IT » Platforms » Linux » Packages » cron
Posted inIT Grimoire

Add sar logging for CPU, RAM, and disk I/O

Add or change /etc/cron.d/sysstat to this. This creates a cron jobe to write file /tmp/outage_resource_log.txt that keeps minute-by-minute stats, sometimes useful in troubleshooting slowdowns. However, it's not a great way to do things, it create a small, constant resource drag, so disable it when done troubleshooting.

# The first element of the path is a directory where the debian-sa1
# script is located
PATH=/usr/lib/sysstat:/usr/sbin:/usr/sbin:/usr/bin:/sbin:/bin

# Activity reports every 10 minutes everyday
#ORIGINAL DEFAULT WAS 5-55/10 * * * * root command -v debian-sa1 > /dev/null && debian-sa1 1 1
#uncomment above line and comment out /tmp/outage_resource_log.txt lines to restore original functionality
* * * * * root date +"%Y-%m-%d %H:%M:%S" >> /tmp/outage_resource_log.txt
* * * * * root sar -u 1 1 >> /tmp/outage_resource_log.txt 2>&1
* * * * * root sar -r 1 1 >> /tmp/outage_resource_log.txt 2>&1
* * *…

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Workshop » Reference Section » Grimoires » IT » Platforms » Linux » Packages » Apache
Posted inIT Grimoire

Add /fpm-status page to Apache virtual host

Add this to virtual host file in /etc/apache2/sites-available/, right below DocumentRoot, in both :80 and :443 sections



SetHandler "proxy:unix:/var/php-fpm/170027027353667.sock|fcgi://127.0.0.1"
Require all granted

May need in /etc/php/8.2/fpm/pool.d/www.conf, not sure:
pm.status_path = /fpm-status

May need at very start of .htaccess to prevent wordpress from intercepting the URL, not sure:
RewriteRule ^fpm-status$ - [L]

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Workshop » Reference Section » Grimoires » IT » Platforms » Linux » Packages » Apache
Posted inIT Grimoire

View last 200 lines of all access logs on apache server

find [path/to/access/logs/folder] -name "*_access_log" -exec sh -c 'tail -200 "$1" | grep -v "HetrixTools\|ok\.txt\|canary" | sed "s/$/ [$(basename "$1" _access_log)]/"' _ {} \; | sort -k4,4

The grep -v "HetrixTools\|ok\.txt\|canary" filters out hits from my uptime monitor.

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Workshop » Reference Section » Grimoires » IT » Platforms » Linux » Packages » fail2ban
Posted inIT Grimoire

How to check Fail2ban log

Command to check fail2ban's log is sudo tail -f /var/log/fail2ban.log

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Linux
Posted inIT Grimoire

Linux PHP tuning utilities & commands

1. See memory consumed by php-fpm8.2 (change this to match different PHP version if necessary)

ps --no-headers -o "rss,cmd" -C php-fpm8.2 | awk '{ sum+=$1 } END { printf ("%d%s\n", sum/NR/1024,"M") }'

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Linux
Posted inIT Grimoire

Linux SQL Tuning Utilities

1. tuning-primer.sh

Run from Github:
curl -L https://raw.githubusercontent.com/BMDan/tuning-primer.sh/main/tuning-primer.sh | bash

2. MySQLTuner.pl

wget http://mysqltuner.pl/ -O mysqltuner.pl
wget https://raw.githubusercontent.com/major/MySQLTuner-perl/master/basic_passwords.txt -O basic_passwords.txt
wget https://raw.githubusercontent.com/major/MySQLTuner-perl/master/vulnerabilities.csv -O vulnerabilities.csv
perl mysqltuner.pl --host 127.0.0.1 --user [user] --pass [pass]

Remember to quote any punctuation or BASH tokens in the password.

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