Add role to install the Blackbox exporter for Prometheus (cloudera-la…

…bs#178)

Signed-off-by: rsuplina <[email protected]>

roles/blackbox/defaults/main.yml

@@ -0,0 +1,26 @@
+---
+
+# Copyright 2024 Cloudera, Inc. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+
+blackbox_tarball_url: https://github.com/prometheus/blackbox_exporter/releases/download/v0.24.0/blackbox_exporter-0.24.0.linux-amd64.tar.gz
+blackbox_directory: /etc/blackbox
+blackbox_bin_directory: /usr/local/bin
+blackbox_tarball_file: blackbox.tar.gz
+
+blackbox_user: blackbox
+blackbox_group: blackbox
+
+blackbox_service_directory: /etc/systemd/system/blackbox.service

roles/blackbox/tasks/main.yml

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+---
+
+# Copyright 2024 Cloudera, Inc. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+- name: Create Blackbox directory 
+  ansible.builtin.file:
+    path: "{{ blackbox_directory }}"
+    state: directory
+
+- name: Create a temporary directory
+  ansible.builtin.tempfile:
+    state: directory
+  register: __blackbox_tmp
+
+- name: Download Blackbox tarball
+  ansible.builtin.get_url:
+    url: "{{ blackbox_tarball_url }}"
+    dest: "{{ __blackbox_tmp.path }}/{{ blackbox_tarball_file }}"
+
+- name: Extract tarball
+  ansible.builtin.unarchive:
+    src: "{{ __blackbox_tmp.path }}/{{ blackbox_tarball_file }}"  
+    dest: "{{ blackbox_directory }}"
+    extra_opts: --strip-components=1
+    remote_src: yes
+
+- name: Remove the temporary  directory 
+  when: __blackbox_tmp is defined
+  ansible.builtin.file:
+    path: "{{ __blackbox_tmp.path }}"
+    state: absent
+
+- name: Create Blackbox group
+  ansible.builtin.group:
+    name: "{{ blackbox_group }}"
+
+- name: Create Blackbox user
+  ansible.builtin.user:
+    name: "{{ blackbox_user }}"
+    system: True
+
+- name: Set ownership of all files inside /etc/blackbox
+  ansible.builtin.file:
+    path: "{{ blackbox_directory }}"
+    owner: "{{ blackbox_user }}"
+    group: "{{ blackbox_group }}"
+    recurse: yes
+
+- name: Copy blackbox binary to /usr/local/bin
+  ansible.builtin.copy:
+    remote_src: yes
+    src: "{{ blackbox_directory }}/blackbox_exporter"
+    dest: "{{ blackbox_bin_directory }}/blackbox_exporter"
+    owner: "{{ blackbox_user }}"
+    group: "{{ blackbox_group }}"
+    mode: '0755'
+
+- name: Create Blackbox service template
+  ansible.builtin.template:
+    src: blackbox.service.j2
+    dest: "{{ blackbox_service_directory }}"
+  register: __blackbox_service
+
+- name: Start and enable Blackbox service
+  when: __blackbox_service.changed
+  block:
+
+  - name: Reload systemd daemon
+    ansible.builtin.systemd:
+      daemon_reload: yes
+
+  - name: Start Blackbox service
+    ansible.builtin.systemd:
+      name: blackbox
+      state: started
+      enabled: yes

roles/blackbox/templates/blackbox.service.j2

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+[Unit]
+Description=Blackbox Exporter Service
+Wants=network-online.target
+After=network-online.target
+
+[Service]
+Type=simple
+User={{ blackbox_user }}
+Group={{ blackbox_group }}
+ExecStart={{ blackbox_bin_directory }}/blackbox_exporter \
+  --config.file={{ blackbox_directory }}/blackbox.yml
+
+Restart=always
+
+[Install]
+WantedBy=multi-user.target