install cloudflare wrap app : https://one.one.one.one/

OR

change your DNS to 8.8.8.8 (from Google)

bench config http_timeout <integer>

bench setup supervisor

bench setup nginx

sudo supervisorctl reload

sudo service nginx reload

ERPNext uses Gunicorn HTTP server in production mode.

For optimal performance the number of Gunicorn workers needs to be set according to the number of CPU cores your serve has.

Recommended number is 2 * num_cores + 1.

It is specified in common_site_config.json file in frappe-bench/sites folder.

after changing gunicorn workers, you need to run:

bench setup supervisor

sudo supervisorctl reread

sudo supervisorctl update

Note : If you have installed ERPNext using easy install script, then the script will have set the appropriate number of workers already. If you have installed ERPNext manually, then you need to set it. Default value is 1. Also if you resize your VPS, you need to adjust the number of workers accordingly.

The biggest impact is of innodb_buffer_pool_size

Check the value by running select variables like "innodb_buffer%" Default 256M is very low. Expert opinion is that it should be 70-80% of total memory

Check for mysql settings at etc/mysql/my.cnf

Change the value of the innodb_buffer_pool_size

To check the minimum required innodb_buffer_pool_size

SELECT CONCAT(CEILING(RIBPS/POWER(1024,pw)),SUBSTR(' KMGT',pw+1,1))
Recommended_InnoDB_Buffer_Pool_Size FROM
(
    SELECT RIBPS,FLOOR(LOG(RIBPS)/LOG(1024)) pw
    FROM
    (
        SELECT SUM(data_length+index_length)*1.1*growth RIBPS
        FROM information_schema.tables AAA,
        (SELECT 1.25 growth) BBB
        WHERE ENGINE='InnoDB'
    ) AA
) A;

1. To check the I/O of the server : https://discuss.erpnext.com/t/maintenance-for-erpnext-performance/50412/15

wget -qO- bench.sh | bash

2. To know server network/internet connectivity with google

https://stackoverflow.com/questions/18215389/how-do-i-measure-request-and-response-times-at-once-using-curl

a. Create a new file, curl-format.txt, and paste in:

    time_namelookup:  %{time_namelookup}s\n
       time_connect:  %{time_connect}s\n
    time_appconnect:  %{time_appconnect}s\n
   time_pretransfer:  %{time_pretransfer}s\n
      time_redirect:  %{time_redirect}s\n
 time_starttransfer:  %{time_starttransfer}s\n
                    ----------\n
         time_total:  %{time_total}s\n

b. curl -w “@curl-format.txt” -o /dev/null -s “http://google.com/

path

sudo nano /etc/fail2ban/jail.conf

ex ignoreip = 127.0.0.1/8 46.152.155.81

sudo systemctl restart fail2ban.service

https://laymanclass.com/how-to-use-fail2ban-on-ubuntu-18-04/

sudo /etc/init.d/fail2ban stop

systemctl stop fail2ban sudo systemctl status -l fail2ban