Merge pull request #4570 from rhcarvalho/adhoc-check-runner-misc

Add playbook to run adhoc health checks or list existing checks

2 files changed, 70 insertions, 5 deletions

diff --git a/playbooks/byo/openshift-checks/README.md b/playbooks/byo/openshift-checks/README.md
index f0f14b268..b26e7d7ed 100644
--- a/playbooks/byo/openshift-checks/README.md
+++ b/playbooks/byo/openshift-checks/README.md
@@ -7,15 +7,14 @@ Ansible's default operation mode is to fail fast, on the first error. However,
 when performing checks, it is useful to gather as much information about
 problems as possible in a single run.
 
-Thus, the playbooks run a battery of checks against the inventory hosts and have
-Ansible gather intermediate errors, giving a more complete diagnostic of the
-state of each host. If any check failed, the playbook run will be marked as
-failed.
+Thus, the playbooks run a battery of checks against the inventory hosts and
+gather intermediate errors, giving a more complete diagnostic of the state of
+each host. If any check failed, the playbook run will be marked as failed.
 
 To facilitate understanding the problems that were encountered, a custom
 callback plugin summarizes execution errors at the end of a playbook run.
 
-# Available playbooks
+## Available playbooks
 
 1. Pre-install playbook ([pre-install.yml](pre-install.yml)) - verifies system
    requirements and look for common problems that can prevent a successful
@@ -27,6 +26,10 @@ callback plugin summarizes execution errors at the end of a playbook run.
 3. Certificate expiry playbooks ([certificate_expiry](certificate_expiry)) -
    check that certificates in use are valid and not expiring soon.
 
+4. Adhoc playbook ([adhoc.yml](adhoc.yml)) - use it to run adhoc checks or to
+   list existing checks.
+   See the [next section](#the-adhoc-playbook) for a usage example.
+
 ## Running
 
 With a [recent installation of Ansible](../../../README.md#setup), run the playbook
@@ -59,6 +62,41 @@ against your inventory file. Here is the step-by-step:
     $ ansible-playbook -i <inventory file> playbooks/byo/openshift-checks/certificate_expiry/default.yaml -v
     ```
 
+### The adhoc playbook
+
+The adhoc playbook gives flexibility to run any check or a custom group of
+checks. What will be run is determined by the `openshift_checks` variable,
+which, among other ways supported by Ansible, can be set on the command line
+using the `-e` flag.
+
+For example, to run the `docker_storage` check:
+
+```console
+$ ansible-playbook -i <inventory file> playbooks/byo/openshift-checks/adhoc.yml -e openshift_checks=docker_storage
+```
+
+To run more checks, use a comma-separated list of check names:
+
+```console
+$ ansible-playbook -i <inventory file> playbooks/byo/openshift-checks/adhoc.yml -e openshift_checks=docker_storage,disk_availability
+```
+
+To run an entire class of checks, use the name of a check group tag, prefixed by `@`. This will run all checks tagged `preflight`:
+
+```console
+$ ansible-playbook -i <inventory file> playbooks/byo/openshift-checks/adhoc.yml -e openshift_checks=@preflight
+```
+
+It is valid to specify multiple check tags and individual check names together
+in a comma-separated list.
+
+To list all of the available checks and tags, run the adhoc playbook without
+setting the `openshift_checks` variable:
+
+```console
+$ ansible-playbook -i <inventory file> playbooks/byo/openshift-checks/adhoc.yml
+```
+
 ## Running in a container
 
 This repository is built into a Docker image including Ansible so that it can
diff --git a/playbooks/byo/openshift-checks/adhoc.yml b/playbooks/byo/openshift-checks/adhoc.yml
new file mode 100644
index 000000000..226bed732
--- /dev/null
+++ b/playbooks/byo/openshift-checks/adhoc.yml
@@ -0,0 +1,27 @@
+---
+# NOTE: ideally this would be just part of a single play in
+# common/openshift-checks/adhoc.yml that lists the existing checks when
+# openshift_checks is not set or run the requested checks. However, to actually
+# run the checks we need to have the included dependencies to run first and that
+# takes time. To speed up listing checks, we use this separate play that runs
+# before the include of dependencies to save time and improve the UX.
+- name: OpenShift health checks
+  # NOTE: though the openshift_checks variable could be potentially defined on
+  # individual hosts while not defined for localhost, we do not support that
+  # usage. Running this play only in localhost speeds up execution.
+  hosts: localhost
+  connection: local
+  roles:
+  - openshift_health_checker
+  vars:
+  - r_openshift_health_checker_playbook_context: adhoc
+  pre_tasks:
+  - name: List known health checks
+    action: openshift_health_check
+    when: openshift_checks is undefined or not openshift_checks
+
+- include: ../openshift-cluster/initialize_groups.yml
+
+- include: ../../common/openshift-cluster/std_include.yml
+
+- include: ../../common/openshift-checks/adhoc.yml