Jinja2¶
Jinja2 is a templating language.
Note
Jinja2 is optional and considered “advanced”.
Jinja2 variable substitutions¶
One popular use of Jinja2 is for variable substitutions and expansions.
In this example we use a substitution to define the vpc_cidr
.
vpc_cidr: {{ vpc_cidr }}
When the time comes to create a new VPC, we pass an extra variable using -e
.
For example, to set the vpc_cidr
to 192.168.1.0/24
:
bf create dogtest01 -e 'vpc_cidr=192.168.1.0/24' webapp.yaml
Jinja2 default filter¶
In this example we will use a Jinja2 filter called default
.
Like our example from before, but this time setting a default.
vpc_cidr: {{ vpc_cidr | default(10.10.0.0/24) }}
Now the user may omit the extra variables and we will use the default.