Automate Your Application on the Cloud

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The document describes how custom commands are used in a pet clinic recipe to dynamically add and remove tomcat instances behind a load balancer. During installation, addNode and removeNode commands are added to the Apache load balancer. When tomcat starts, it invokes addNode to be registered with the load balancer. On stop, it invokes removeNode to deregister. This allows automatic scaling of tomcat instances behind the load balancer.

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Custom Commands in the Pet Clinic Recipe

All the services are
being installed

Load Balancer

Custom Commands in the Pet Clinic Recipe

During its installation,
two custom commands
are added to the
Load Balancer Apache service.

addNode
(custom command)

removeNode
(custom command)

Custom Commands in the Pet Clinic Recipe

The ApacheLB service
is started

Load Balancer

addNode
(custom command)

removeNode
(custom command)

Custom Commands in the Pet Clinic Recipe

Now the Tomcat
service can start

Load Balancer

addNode
(custom command)

removeNode
(custom command)

Custom Commands in the Pet Clinic Recipe

Tomcat service
starts

Load Balancer

addNode
(custom command)

removeNode
(custom command)

Custom Commands in the Pet Clinic Recipe

Tomcat postStart
lifecycle event

Load Balancer

addNode
(custom command)

removeNode
(custom command)

Custom Commands in the Pet Clinic Recipe
During the postStart,
each tomcat instance
invokes the
Load Balancer apacheLB’s addNode
custom command

Each tomcat instance invokes the
apacheLB’s addNode
custom command
addNode
(custom command)

removeNode
(custom command)

Custom Commands in the Pet Clinic Recipe
The apacheLB’s
configuration is
modified to contain
Load Balancer the new member

Tweaking the
configuration:
Now apacheLB
Each tomcat instance invokes the has one more
apacheLB’s addNode member
custom command
addNode
(custom command)

removeNode
(custom command)

Custom Commands in the Pet Clinic Recipe

Tomcat postStop
lifecycle event

Load Balancer

Tweaking the
configuration:
Now apacheLB
Each tomcat instance invokes the has one more
apacheLB’s addNode member
custom command
addNode
(custom command)

removeNode
(custom command)

Custom Commands in the Pet Clinic Recipe
During the postStop,
each tomcat instance
invokes the
Load Balancer apacheLB’s removeNode
custom command

Tweaking the
configuration:
Now apacheLB
Each tomcat instance invokes the has one more
apacheLB’s addNode member
custom command
addNode
(custom command)

Each tomcat instance invokes the
apacheLB’s removeNode
custom command
removeNode
(custom command)

Custom Commands in the Pet Clinic Recipe
The apacheLB’s
configuration is
modified to remove
Load Balancer the member

Tweaking the
configuration:
Now apacheLB
Each tomcat instance invokes the has one more
apacheLB’s addNode member
custom command
addNode
(custom command)

Tweaking the
Each tomcat instance invokes the
configuration:
apacheLB’s removeNode Now apacheLB
custom command has one less
removeNode member
(custom command)

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1. Custom Commands in the Pet Clinic Recipe All the services are being installed Load Balancer

2. Custom Commands in the Pet Clinic Recipe During its installation, two custom commands are added to the Load Balancer Apache service. addNode (custom command) removeNode (custom command)

3. Custom Commands in the Pet Clinic Recipe The ApacheLB service is started Load Balancer addNode (custom command) removeNode (custom command)

4. Custom Commands in the Pet Clinic Recipe Now the Tomcat service can start Load Balancer addNode (custom command) removeNode (custom command)

5. Custom Commands in the Pet Clinic Recipe Tomcat service starts Load Balancer addNode (custom command) removeNode (custom command)

6. Custom Commands in the Pet Clinic Recipe Tomcat postStart lifecycle event Load Balancer addNode (custom command) removeNode (custom command)

7. Custom Commands in the Pet Clinic Recipe During the postStart, each tomcat instance invokes the Load Balancer apacheLB’s addNode custom command Each tomcat instance invokes the apacheLB’s addNode custom command addNode (custom command) removeNode (custom command)

8. Custom Commands in the Pet Clinic Recipe The apacheLB’s configuration is modified to contain Load Balancer the new member Tweaking the configuration: Now apacheLB Each tomcat instance invokes the has one more apacheLB’s addNode member custom command addNode (custom command) removeNode (custom command)

9. Custom Commands in the Pet Clinic Recipe Tomcat postStop lifecycle event Load Balancer Tweaking the configuration: Now apacheLB Each tomcat instance invokes the has one more apacheLB’s addNode member custom command addNode (custom command) removeNode (custom command)

10. Custom Commands in the Pet Clinic Recipe During the postStop, each tomcat instance invokes the Load Balancer apacheLB’s removeNode custom command Tweaking the configuration: Now apacheLB Each tomcat instance invokes the has one more apacheLB’s addNode member custom command addNode (custom command) Each tomcat instance invokes the apacheLB’s removeNode custom command removeNode (custom command)

11. Custom Commands in the Pet Clinic Recipe The apacheLB’s configuration is modified to remove Load Balancer the member Tweaking the configuration: Now apacheLB Each tomcat instance invokes the has one more apacheLB’s addNode member custom command addNode (custom command) Tweaking the Each tomcat instance invokes the configuration: apacheLB’s removeNode Now apacheLB custom command has one less removeNode member (custom command)

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