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wget https://github.com/paradiseduo/tcping/releases/download/3.6/tcping.zip
unzip tcping.zip
chmod +x tcping
mv tcping /usr/local/bin/
sudo xattr -rd com.apple.quarantine /usr/local/bin/tcping

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ab -n 100 -c 100 https://domain.com

-n requests

Number of requests to perform for the benchmarking session. The default is to just perform a single request which usually leads to non-representative benchmarking results.

-c concurrency

Number of multiple requests to perform at a time. Default is one request at a time.

Reference:

• https://httpd.apache.org/docs/2.4/programs/ab.html

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curl --head https://domain.com

-I/--head (HTTP/FTP/FILE) Fetch the HTTP-header only! HTTP-servers feature the command HEAD which this uses to get nothing but the header of a document. When used on a FTP or FILE file, curl displays the file size and last modification time only.

---

curl -s -v https://domain.com

-s/--silent

Silent or quiet mode. Don't show progress meter or error messages. Makes Curl mute.

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Nginx timeout variables

• client_body_timeout
• send_timeout
• keepalive_timeout
• lingering_timeout
• resolver_timeout

NGINX Backend Timeouts

• proxy_connect_timeout

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Reference

• https://www.exim.org/exim-html-current/doc/html/spec_html/ch-the_appendfile_transport.html
• https://doc.dovecot.org/configuration_manual/quota/
• https://doc.dovecot.org/settings/plugin/quota-plugin/
• https://wiki.dovecot.org/LDA/Exim
• https://forum.directadmin.com/threads/howto-use-dovecots-deliver-report-quota-through-imap.33255/

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References

• Try Django 2.2 - Web Development with Python 3.6+

virtualenv vs pipenv vs venv

https://blog.devjunction.in/difference-between-virtualenv-pipenv-and-venv

Source Code

• Main repo: https://github.com/codingforentrepreneurs/Try-Django-2.2
• Readme: https://github.com/codingforentrepreneurs/Try-Django-2.2/blob/master/README.md#L0-L1

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Reference: https://stackoverflow.com/a/56377694/5729075

Install dependencies

sudo apt-get install python3-certbot-nginx python3-certbot-apache

Test mode

Nginx

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Exim log line flags

https://www.exim.org/exim-html-current/doc/html/spec_html/ch-log_files.html#SECID250

Exim cheatsheet

• Reference : http://bradthemad.org/tech/notes/exim_cheatsheet.php

exim -bt email@domain.com

Print a listing of the messages in the queue (time queued, size, message-id, sender, recipient):

exim -bp

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Spam Assassin rules

https://topdeliverability.com/spamassassin-rules/# https://spamassassin.apache.org/old/tests_3_3_x.html

Check domain blocklists

https://check.spamhaus.org/ https://www.mailspike.net/iplookup.html

Spam checker

https://redsift.com/tools/investigate?

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Put this on crontab

0 * * *  * sync; echo 3 > /proc/sys/vm/drop_caches

Reference

• https://tecadmin.net/flush-memory-cache-on-linux-server/