Cloudify Bash Plugin

This plugin allows the execution of bash scripts as part of a node interface opeations.

Usage

built-in bash types

Cloudify offers some built in types, whose lifecycle interface (see Lifecycle Interface) is mapped to execute bash scripts by default. When using these types, a property by the name of 'scripts' should be part of the node properties, mapping each interface operation to a specific script.

for example:

-   name: http_web_server
    type: cloudify.types.bash.web_server
    properties:
      scripts:            
        configure: scripts/configure.sh
        start: scripts/start.sh
        stop: scripts/stop.sh

This means that the 'configure', 'start' and 'stop' operations will be executed by the 'configure.sh', 'start.sh' and 'stop.sh' scripts respectively. You can of course create you own interface and map any operation to any script.

for a complete example of the usage see Cloudify Hello World

direct operation mapping

You can also specify a script for execution on a specific operation by mapping it directly inside the intefrace declaration.

for example:

types:
  my_new_type:
    derived_from: cloudify.types.base
    interfaces:
        my_new_interface:
            - my_new_operation:
                  mapping: 'bash_runner.tasks.run'
                  properties:
                      script_path: 'scripts/my-new-script.sh'

This means the operation 'my_new_operation' of inteface 'my_new_inteface' for the type 'my_new_type' is mapped to the Bash plugin, with the 'my-new-script.sh' set for execution.

API

Cloudify offers some extra API available to use inside your scripts.

blueprint resource access

You can access blueprint resource inside your script using the function 'download_resource <relative_path_to_resource>', to enable this function add the following line at the beginning of your script:

. ${CLOUDIFY_FILE_SERVER}

for example:

. ${CLOUDIFY_FILE_SERVER}
cfy_download_resource index.html

index.html in this example should be placed in the root of the blueprint folder.

NOTE: This function is implemented using bash 'wget' function. That means you can pass any wget flags as well.

logging

You can log messages from the script by using the 'info <message>' and 'error <message>' functions. to enable these function add the following line at the beginning of your script:

. ${CLOUDIFY_LOGGING}

for example:

cfy_info THIS IS AN INFO PRINT
cfy_error THIS IS AN ERROR PRINT

This messages will be stored in Cloudify's logging mechanism and be viewed as regular logs. As such, they will be displayed in the CLI, as well as the Web interface.

By default, Cloudify will not log the script's system out stream. to enable this type of logging, pass the 'log_all' property as part of the node properties, or in the direct mapping approach. (see above)