Having multiple drush versions on a enviroment

Do this on your local or virtual enviroment, depending where do you want to have it

mkdir ~/drush10
cd ~/drush10
composer require "drush/drush:10.*"

this will install drush10 to that directory and now you just need to add alias

SSH keys setup on Mac OsX

To add multiple ssh keys to your system, you need to edit config file ~/.ssh/config and put lines like below, this will also help store password for your ssh in keychain and use agent forwarding so you can use your keys on virtual machines like vagrant

Fastly and other CDN batch error

As Batch is dependent on the order of query string parameters if you are using Fastly or some other CDN they often have "Query String Sort" enabled or it is a good practice to do that, as it will result in more cache hits for you.

Flood and Block Ip while running tests (403)

There are 2 system in drupal 7 for IP blocking, one is flood blocking that is used on login and other is 
system_block_ip_action that is storing IP's in blocked_ips table and checking them while bootstrapping.

DrupalVM can't mount NFS or similar access problems on Mac OSX

This problem with access permissions has become common in latest versions of Mac OS, you need to give permissions to apps (executables) so they can do/use stuff on your disk/computer. Most of the times you will get a prompt for asking/checking this but sometimes this will quietly fail.

GitLab revert the reverted merge

So you made a mistake and made a revert, then you want to introduce again the code you use in new merge, if you try to make merge request(MR) from branch you made original MR you reverted you will get nothing in that MR. This is not a bug, but a feature of git. Reverting does not roll back, but rather appends the revert to the front of the HEAD.

Xdebug with VSCode and DrupalVM

After installing xdebug as extension to VS Code there is simple config you need to do to make it work with DrupalVM and debug. Create debug profile in standard VS code way and add this