Fix mysqldump missing 'Grave Accent'

[GabrielBrascher]

Fix mysqldump command in the "Database Preparation" section.

Nowadays it is:

$ mysqldump -u root -p -R cloud > cloud-backup_`date '+%Y-%m-%d'.sql
$ mysqldump -u root -p cloud_usage > cloud_usage-backup_`date '+%Y-%m-%d'.sql

This won't work as it is missing a grave accent () in ``date '+%Y-%m-%d'..
Should be:

$ mysqldump -u root -p -R cloud > cloud-backup_`date '+%Y-%m-%d'`.sql
$ mysqldump -u root -p cloud_usage > cloud_usage-backup_`date '+%Y-%m-%d'`.sql

[GabrielBrascher]

@blueorangutan docbuild

[blueorangutan]

@GabrielBrascher a Jenkins job has been kicked to build the document. I'll keep you posted as I make progress.

[blueorangutan]

Doc build preview: http://qa.cloudstack.cloud/docs/WIP-PROOFING/pr/255. (SL-JID 172)

[rohityadavcloud]

@GabrielBrascher would it be safer to use the $(cmd) syntax? Also improves readability over `?

[GabrielBrascher]

@rhtyd good point, $(cmd) looks like a better option indeed.
I will update the changes, thanks!

[GabrielBrascher]

@blueorangutan docbuild

[blueorangutan]

@GabrielBrascher a Jenkins job has been kicked to build the document. I'll keep you posted as I make progress.

[blueorangutan]

Doc build preview: http://qa.cloudstack.cloud/docs/WIP-PROOFING/pr/255. (SL-JID 173)

[weizhouapache]

@GabrielBrascher I know only date is used in old docs. would it be better to use date and time like the following ?

$ echo cloud-backup_$(date +%Y-%m-%d-%H%M%S).sql
cloud-backup_2021-12-02-165439.sql

[GabrielBrascher]

@weizhouapache I assume that as the upgrade is a process that is done in one day it would not be needed, I don't imagine more than one backup at a day at least for the given operaiton.

But it looks like a good "safety" command in case someone backs up the DB before and after the upgrade and ends up overriding the first backup.

[GabrielBrascher]

Updated to @weizhouapache suggestions.

@blueorangutan docbuild

[blueorangutan]

@GabrielBrascher a Jenkins job has been kicked to build the document. I'll keep you posted as I make progress.

[blueorangutan]

Doc build preview: http://qa.cloudstack.cloud/docs/WIP-PROOFING/pr/255. (SL-JID 174)

[weizhouapache]

LGTM !

[rohityadavcloud]

Lgtm