scylla-monitoring: auto-detect Scylla dashboard version

Auto-detect Scylla version when scylla_monitoring_dashboards_versions is not specified
or is empty.

Scylla must be installed on the first host from the 'scylla' section in the inventory for
auto-detection to succeed.

Signed-off-by: Vlad Zolotarov <[email protected]>

ansible-scylla-monitoring/defaults/main.yml

@@ -31,9 +31,10 @@ scylla_monitoring_alertdata_path: "{{ scylla_monitoring_deploy_path }}/alertdata
 # will use the information from the inventory to generate scylla_servers.yml.
 use_nodetool_status_with_genconfig: false
 
-# List of monitoring dashboards to enable
-scylla_monitoring_dashboards_versions:
-  - '2021.1'
+# List of monitoring dashboards to enable. If empty or not set the Role will auto-select the one that corresponds to a
+# Scylla version installed on the first host from the 'scylla' inventory section.
+#scylla_monitoring_dashboards_versions:
+#  - '2021.1'
 
 # Username which will be used for the cql plugin if auth is enabled on scylla-server side
 # scylla_monitoring_cql_default_user: 'scylla_cql_monitor'

ansible-scylla-monitoring/tasks/common.yml

@@ -240,3 +240,26 @@
         msg: "Can't auto-detect Scylla Manager dashboard version. Either specify it explicitly or install Scylla Manager Server on the Scylla Manager host."
       when: _sm_version_out.rc != 0
   when: _scylla_monitoring_params is not search("-M\s+") and 'scylla-manager' in groups and (groups['scylla-manager']|length > 0)
+
+- name: Set _scylla_monitoring_dashboards_versions to scylla_monitoring_dashboards_versions
+  set_fact:
+    _scylla_monitoring_dashboards_versions: "{{ scylla_monitoring_dashboards_versions | default([]) }}"
+
+- name: Auto detect Scylla version if dashboard versions were not explicitly specified
+  block:
+    - name: Get Scylla version from the first Scylla node
+      shell: |
+        scylla --version | cut -d'.' -f1,2
+      delegate_to: "{{ groups['scylla'][0] }}"
+      register: _scylla_version_out
+
+    - name: Adding Scylla dashboard option if getting a Scylla version was successful
+      set_fact:
+        _scylla_monitoring_dashboards_versions: ["{{ _scylla_version_out.stdout }}"]
+      when: _scylla_version_out.rc == 0
+
+    - name: Error out if failed to get Scylla version
+      fail:
+        msg: "Can't auto-detect Scylla dashboard version. Either specify it explicitly or install scylla on the first Scylla node."
+      when: _scylla_version_out.rc != 0
+  when: (_scylla_monitoring_dashboards_versions|length == 0) and 'scylla' in groups and (groups['scylla']|length > 0)

ansible-scylla-monitoring/tasks/docker.yml

@@ -39,7 +39,7 @@
       ./start-all.sh \
         -d {{ scylla_monitoring_data_path }} \
         -f {{ scylla_monitoring_alertdata_path }} \
-        -v {{ scylla_monitoring_dashboards_versions|join(',') }} \
+        -v {{ _scylla_monitoring_dashboards_versions|join(',') }} \
         -s {{ scylla_monitoring_config_path }}/scylla_servers.yml \
         -N {{ scylla_monitoring_config_path }}/scylla_manager_servers.yml \
         -r {{ scylla_monitoring_config_path }}/rule_config.yml \
@@ -67,7 +67,7 @@
       ./start-all.sh \
         -d {{ scylla_monitoring_data_path }} \
         -f {{ scylla_monitoring_alertdata_path }} \
-        -v {{ scylla_monitoring_dashboards_versions|join(',') }} \
+        -v {{ _scylla_monitoring_dashboards_versions|join(',') }} \
         -s {{ scylla_monitoring_config_path }}/scylla_servers.yml \
         -N {{ scylla_monitoring_config_path }}/scylla_manager_servers.yml \
         -r {{ scylla_monitoring_config_path }}/rule_config.yml \
@@ -95,7 +95,7 @@
       ./start-all.sh \
         -d {{ scylla_monitoring_data_path }} \
         -f {{ scylla_monitoring_alertdata_path }} \
-        -v {{ scylla_monitoring_dashboards_versions|join(',') }} \
+        -v {{ _scylla_monitoring_dashboards_versions|join(',') }} \
         -s {{ scylla_monitoring_config_path }}/scylla_servers.yml \
         -N {{ scylla_monitoring_config_path }}/scylla_manager_servers.yml \
         -r {{ scylla_monitoring_config_path }}/rule_config.yml \
@@ -124,7 +124,7 @@
       ./start-all.sh \
         -d {{ scylla_monitoring_data_path }} \
         -f {{ scylla_monitoring_alertdata_path }} \
-        -v {{ scylla_monitoring_dashboards_versions|join(',') }} \
+        -v {{ _scylla_monitoring_dashboards_versions|join(',') }} \
         -s {{ scylla_monitoring_config_path }}/scylla_servers.yml \
         -N {{ scylla_monitoring_config_path }}/scylla_manager_servers.yml \
         -r {{ scylla_monitoring_config_path }}/rule_config.yml \