Install scripts don't allow use of Ansible's --start-at-task flag

[PaulKiddle]

If my install fails halfway through and I need to re-run, I can't use Ansible's --start-at-task option, because of the required calls to set_fact in in the common role. This means running the entire process again including unnecessary large downloads.

It might be better to set these variables in "group_vars" using a combination of the "default" filter and other logic, or at least import the common tasks at the start of roles that require them to have been run.

[vjrj]

About large downloads, we use skip/skip-tags:
https://github.com/AtlasOfLivingAustralia/documentation/wiki/FAQ#so-what-happens-when-i-rerun-the-ansible-it-doesnt-like-make-two-versions-of-everything
although in the case of the nameindex, in a near future will not download again.

About repeating/reruning ansible: we use the --tags, for instance to repeat some war deploy (because I changed some service version) with common,deploy tags. In our case, we use the ansible wrapper:

$  ./ansiblew --alainstall=../../ala-install-up-to-date collectory --tags=common,deploy
ansible-playbook -u ubuntu -i gbif-es-inventory.ini -i gbif-es-local-extras.ini -i gbif-es-local-passwords.ini ../../ala-install-up-to-date/ansible/collectory-standalone.yml --tags common,deploy --limit colecciones.gbif.es --extra-vars ala_install_repo=../../ala-install-up-to-date

other tags I use:

• --tags properties: when I change something in the configuration
• --tags nginx,nginx_vhost: when I only want to reconfigure the nginx vhosts

but many times I run the entire playbook skipping downloads to be sure that ends correctly.

For instance if I want to deploy or update our biocache, using the ansiblew wrapper without --nodryrun only to show the real ansible-playbook command:

$ ./ansiblew --alainstall=../../ala-install-up-to-date ala_hub --skip=nameindex                                   
ansible-playbook -u ubuntu -i gbif-es-inventory.ini -i gbif-es-local-extras.ini -i gbif-es-local-passwords.ini ../../ala-install-up-to-date/ansible/biocache-hub-standalone.yml --skip-tags nameindex --limit registros.gbif.es --extra-vars ala_install_repo=../../ala-install-up-to-date

and this skips the nameindex download.