rollback-component step

The rollback-component step starts child component processes for rolling back a single component. This step is only valid in an application process.

Format

rollback-component step "foo" is
    -- name of the component to deploy; required
    component "my-component"

    -- name of the component process to run for each component; required
    process "deploy-component-process-property"

    -- mode for selecting versions to rollback; required
    --   remove-undesired-incremental-versions - rollback incremental versions
    --   replace-with-last-deployed - rollback to previous version
    rollback-type replace-with-last-deployed

    -- select versions for rollback with this inventory status; required
    select-versions-with-inventory-status "Active"

    -- select resources to rollback on by resource tag; optional
    -- before 7.1.1.0, the tag must be specified by internal database ID
    select-resources-by-tag "my-tag"

    -- don't start further children after a failure; optional
    -- default is false
    fail-fast false

    -- suppress warnings generated by children; optional
    -- default is false
    ignore-child-warnings false

    -- maximum number of concurrent processes; optional
    -- default is unlimited
    max-concurrent-processes unlimited

    -- javascript precondition script that must evaluate to true for the step to execute; optional
    precondition-script
        """
        true
        """

    -- set a component process property value; optional, repeatable
    property "component-process-property-1" = "cpp1-value"
    property "component-process-property-2" = "cpp1-value"

on success
    start "bar"
end

Properties

Table 1. Rollback Component properties
Field	Description
Name	A name for the step. Other process steps can refer to this step by this name.
Component	Component that is used by the step; a step can affect a single component. All components that are associated with the application are available. If you want to roll back another component, add another rollback step to the process or use the Rollback Multiple Components step.
Remove Versions with Status	Restricts the component versions that are affected by the step. Only versions with the selected status are affected. By default, the status `Active` refers to versions that are currently deployed.
Component Process	The component process to run. In most cases, select a component process that uninstalls the component.
Limit to Resource Tag	The user-defined resource tag that determines which resource runs the process. Only a resource with this tag, or a resource that has a parent with this tag, runs the process. See Adding tags to objects.
Rollback type	Determines the type of rollback. If you specify `Remove Undesired Incremental Versions`, the server runs the uninstall process for each version that is not in the specified snapshot. See Rolling back to a snapshot. If you specify `Replace with Last Deployed`, the server runs the specified process on the version that was installed when the process began. See Uninstalling components with an application process.
Maximum number of concurrent processes	The maximum number of concurrent processes to run. This setting limits the number of processes that run simultaneously. For example, if you set the maximum number of concurrent processes to 2, only two instances of a component are rolled back at a time, even if there are many instances of the component. To run an unlimited number of concurrent processes, specify `-1`. To limit the number of processes to run at once, as in rolling deployments, specify an integer. The server attempts to resolve the value to an integer. If the value does not resolve to an integer, then the `-1` value is used by default. You can use a property in this field, as long as the property resolves to an integer. Note: The maximum number of component processes that can run concurrently is limited by the hardware that hosts the agent.
Fail Fast	If this check box is selected, the step does not start more processes after one process fails.
Precondition	A JavaScript 1.7 script that defines a condition that must exist before the step can run. The condition must resolve to `true` or `false`. In the script, do not use the `${p:component.myProperty}` notation. For example, to check the value of a component property in a component process, use `properties.get("myProperty") == "myValue"`. See Property contexts for information about property access.

Example

start is
    start A
    start B
end

rollback-component step A is
    component "component-a"
    process "process-a"
    rollback-type replace-with-last-deployed
    select-versions-with-inventory-status "status-a"
    select-resources-by-tag "tag-a"
    fail-fast true
    ignore-child-warnings true
    max-concurrent-processes 100
    precondition-script "script-a"
    property "prop-a1" = "prop-a1-value"
    property "prop-a2" = "prop-a2-value"
    property "prop-a3" = "prop-a3-value"
on success
    finish
end

rollback-component step B is
    component "component-b"
    process "process-b"
    rollback-type remove-undesired-incremental-versions
    select-versions-with-inventory-status "status-b"
on success
    finish
end