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Low-touch onboarding of Citrix ADC instances using Citrix ADM service connect
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Importing and synchronizing StyleBooks from GitHub repository
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Dependency detection
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Use ADM audit logs for managing and monitoring your infrastructure
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Dependency detection
Components in a StyleBook can refer to properties or sections of other components in the same StyleBook. Components are complete blocks by themselves and they may not be written in the same order that they have to be ran. The StyleBook compiler checks the order in which the components are written and then runs them in a logical order.
Example:
components:
-
name: lbvserver-comp
type: ns::lbvserver
properties:
name: mylb
ipv46: 10.102.190.15
port: 80
servicetype: HTTP
-
name: lb-sg-binding-comp
type: ns::lbvserver_servicegroup_binding
condition: $parameters.create-binding
properties:
name: $components.lbvserver-comp.properties.name
servicegroupname: $components.sg-comp.properties.servicegroupname
-
name: sg-comp
type: ns::servicegroup
properties:
servicegroupname: mysg
servicetype: HTTP
In the above example, there are three components defined - lbvserver-comp, lb-sg-binding-comp, and sg-comp. When you run this StyleBook, the lbvserver-comp
is first created. The lb-sg-binding-comp
refers to lbvserver-comp
properties, but it cannot be created next though it is the second component defined in the StyleBook. This is because the lb-sg-binding-comp
also has a dependency on the sg-comp
which is yet to be created. As a result, the compiler reorders the components so that the dependencies of a component are resolved by the time a component is created, and runs this reordered list of components. The order of execution of the above StyleBook is: lbvserver-comp
, sg-comp
, and lb-sg-binding-comp
.
Thus, the author of a StyleBook need not worry about the correct order of the components. The components may appear in any order. The compiler computes the correct order of execution of the components based on how the components refer each other. Note that this applies to substitutions and outputs sections as well.
Cyclic Dependencies
Since a component may refer another component, it is possible that the cycle of dependencies may be introduced in the definition of the StyleBook. For example, if component A refers to a property defined in component B, which again refers to a property defined in component A. This kind of dependency is called cyclic dependencies. Cyclic dependencies cannot be resolved automatically. The author of the StyleBook manually corrects the StyleBook definition to eliminate such cyclic dependencies. The compiler will be able to identify cyclic dependencies - if they exist, and report it.
The following example shows a cyclic dependency of components:
components:
-
name: lbvserver-comp
type: ns::lbvserver
properties:
name: $components.lb-sg-binding-comp.properties.name
ipv46: 10.102.190.15
port: 80
servicetype: HTTP
-
name: lb-sg-binding-comp
type: ns::lbvserver_servicegroup_binding
condition: $parameters.create-binding
properties:
name: mylb
servicegroupname: $components.sg-comp.properties.servicegroupname
-
name: sg-comp
type: ns::servicegroup
properties:
servicegroupname: mysg
servicetype: $components.lbvserver-comp.properties.servicetype
In the above example, there are three components: lbvserver-comp, lb-sg-binding-comp, and sg-comp. The lbvserver-comp
component depends on lb-sg-binding-comp
, lb-sg-binding
components. And, these components depend on sg-comp
. The sg-comp
component depends on lbvserver-comp
. Here, a cycle of dependencies among these components is formed and this cannot be resolved automatically. As a result, this StyleBook cannot be ran. The StyleBook compiler detects this and prevents the StyleBook from being imported into Citrix ADM.
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