Add the configuration of the solr exporter to the solr role. Open the firewall so that prometheus can read the solr metrics.

solr/defaults/main.yml

@@ -51,3 +51,13 @@ solr_cloud_mode: True
 solr_zk_external_cluster: False
 solr_zk_hosts: '127.0.0.1:2181'
 solr_zk_timeout: 15000
+
+solr_prometheus_exporter: True
+solr_prometheus_port: 9983
+solr_prometheus_threads: 2
+solr_prometheus_bindir: '{{ solr_server_dir }}/contrib/prometheus-exporter/bin'
+solr_prometheus_command: 'solr-exporter'
+solr_prometheus_command_params: '-p {{ solr_prometheus_port }} -b {{ solr_zk_hosts }} -f {{ solr_prometheus_conf_file }} -n {{ solr_prometheus_threads }}' 
+solr_prometheus_data_dir: '{{ solr_base_dir }}/solr_prometheus_exporter'
+solr_prometheus_conf_dir: '{{ solr_prometheus_data_dir }}/conf'
+solr_prometheus_conf_file: '{{ solr_prometheus_conf_dir }}/solr-exporter-config.xml'

solr/handlers/main.yml

@@ -2,3 +2,5 @@
 - name: solr restart
   service: name=solr state=restarted
 
+- name: Restart Solr prometheus exporter
+  service: name=solr_prometheus_exporter state=restarted enabled=yes

solr/meta/main.yml

@@ -0,0 +1,4 @@
+---
+dependencies:
+  - { role: '../../library/roles/oracle-jdk', when: openjdk_install is not defined or not openjdk_install }
+  - { role: '../../library/roles/openjdk', when: openjdk_install | default(False) }

solr/tasks/main.yml

@@ -62,3 +62,31 @@
   become_user: root
   when: solr_install
   tags: solr
+
+- block:
+  - name: Create the Solr prometheus exporter conf directory
+    file: dest={{ solr_prometheus_conf_dir }} state=directory mode=0755
+
+  - name: Install the Solr prometheus exporter config file
+    template: src=solr-exporter-config.xml dest={{ solr_prometheus_conf_file }} mode=0644
+    notify: Restart Solr prometheus exporter
+
+  - name: Install the Solr prometheus exporter upstart script
+    template: src=solr_prometheus_exporter.upstart.j2 dest=/etc/init/solr_prometheus_exporter.conf mode=0644 owner=root group=root
+    when: ansible_service_mgr != 'systemd'
+
+  - name: Install the Solr prometheus exporter systemd unit
+    template: src=solr_prometheus_exporter.systemd.j2 dest=/etc/systemd/system/solr_prometheus_exporter.service mode=0644 owner=root group=root
+    when: ansible_service_mgr == 'systemd'
+    notify: systemd reload
+
+  - name: Ensure that Solr prometheus exporter is started and enabled
+    service: name=solr_prometheus_exporter state=started enabled=yes
+
+  become: True
+  become_user: root
+  when:
+    - solr_install
+    - solr_prometheus_exporter
+  tags: [ 'solr', 'solr_prometheus', 'solr_prometheus_exporter' ]
+

solr/templates/solr_prometheus_exporter.systemd.j2

@@ -0,0 +1,11 @@
+[Unit]
+Description=solr_prometheus_exporter - Prometheus exporter for Solr metrics.
+After=network.target
+
+[Service]
+Type=simple
+User={{ solr_user }}
+Group={{ solr_group }}
+ExecStart={{ solr_prometheus_bindir }}/{{ solr_prometheus_command }} {{ solr_prometheus_command_params }}
+Restart=on-failure
+

solr/templates/solr_prometheus_exporter.upstart.j2

@@ -0,0 +1,12 @@
+description "Solr exporter for Prometheus"
+start on (local-filesystems and net-device-up IFACE!=lo)
+stop on runlevel [016]
+
+respawn
+respawn limit 10 5
+setuid {{ solr_user }}
+setgid {{ solr_group }}
+
+script
+  exec {{ solr_prometheus_bindir }}/{{ solr_prometheus_command }} {{ solr_prometheus_command_params }}
+end script