Initial version

Signed-off-by: Knut Ahlers <knut@ahlers.me>

LICENSE

@@ -0,0 +1,202 @@
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
+      "Object" form shall mean any form resulting from mechanical
+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
+      and conversions to other media types.
+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
+      the Work and Derivative Works thereof.
+
+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
+      submitted to Licensor for inclusion in the Work by the copyright owner
+      or by an individual or Legal Entity authorized to submit on behalf of
+      the copyright owner. For the purposes of this definition, "submitted"
+      means any form of electronic, verbal, or written communication sent
+      to the Licensor or its representatives, including but not limited to
+      communication on electronic mailing lists, source code control systems,
+      and issue tracking systems that are managed by, or on behalf of, the
+      Licensor for the purpose of discussing and improving the Work, but
+      excluding communication that is conspicuously marked or otherwise
+      designated in writing by the copyright owner as "Not a Contribution."
+
+      "Contributor" shall mean Licensor and any individual or Legal Entity
+      on behalf of whom a Contribution has been received by Licensor and
+      subsequently incorporated within the Work.
+
+   2. Grant of Copyright License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      copyright license to reproduce, prepare Derivative Works of,
+      publicly display, publicly perform, sublicense, and distribute the
+      Work and such Derivative Works in Source or Object form.
+
+   3. Grant of Patent License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      (except as stated in this section) patent license to make, have made,
+      use, offer to sell, sell, import, and otherwise transfer the Work,
+      where such license applies only to those patent claims licensable
+      by such Contributor that are necessarily infringed by their
+      Contribution(s) alone or by combination of their Contribution(s)
+      with the Work to which such Contribution(s) was submitted. If You
+      institute patent litigation against any entity (including a
+      cross-claim or counterclaim in a lawsuit) alleging that the Work
+      or a Contribution incorporated within the Work constitutes direct
+      or contributory patent infringement, then any patent licenses
+      granted to You under this License for that Work shall terminate
+      as of the date such litigation is filed.
+
+   4. Redistribution. You may reproduce and distribute copies of the
+      Work or Derivative Works thereof in any medium, with or without
+      modifications, and in Source or Object form, provided that You
+      meet the following conditions:
+
+      (a) You must give any other recipients of the Work or
+          Derivative Works a copy of this License; and
+
+      (b) You must cause any modified files to carry prominent notices
+          stating that You changed the files; and
+
+      (c) You must retain, in the Source form of any Derivative Works
+          that You distribute, all copyright, patent, trademark, and
+          attribution notices from the Source form of the Work,
+          excluding those notices that do not pertain to any part of
+          the Derivative Works; and
+
+      (d) If the Work includes a "NOTICE" text file as part of its
+          distribution, then any Derivative Works that You distribute must
+          include a readable copy of the attribution notices contained
+          within such NOTICE file, excluding those notices that do not
+          pertain to any part of the Derivative Works, in at least one
+          of the following places: within a NOTICE text file distributed
+          as part of the Derivative Works; within the Source form or
+          documentation, if provided along with the Derivative Works; or,
+          within a display generated by the Derivative Works, if and
+          wherever such third-party notices normally appear. The contents
+          of the NOTICE file are for informational purposes only and
+          do not modify the License. You may add Your own attribution
+          notices within Derivative Works that You distribute, alongside
+          or as an addendum to the NOTICE text from the Work, provided
+          that such additional attribution notices cannot be construed
+          as modifying the License.
+
+      You may add Your own copyright statement to Your modifications and
+      may provide additional or different license terms and conditions
+      for use, reproduction, or distribution of Your modifications, or
+      for any such Derivative Works as a whole, provided Your use,
+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
+      except as required for reasonable and customary use in describing the
+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+      implied, including, without limitation, any warranties or conditions
+      of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+      PARTICULAR PURPOSE. You are solely responsible for determining the
+      appropriateness of using or redistributing the Work and assume any
+      risks associated with Your exercise of permissions under this License.
+
+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
+      incidental, or consequential damages of any character arising as a
+      result of this License or out of the use or inability to use the
+      Work (including but not limited to damages for loss of goodwill,
+      work stoppage, computer failure or malfunction, or any and all
+      other commercial damages or losses), even if such Contributor
+      has been advised of the possibility of such damages.
+
+   9. Accepting Warranty or Additional Liability. While redistributing
+      the Work or Derivative Works thereof, You may choose to offer,
+      and charge a fee for, acceptance of support, warranty, indemnity,
+      or other liability obligations and/or rights consistent with this
+      License. However, in accepting such obligations, You may act only
+      on Your own behalf and on Your sole responsibility, not on behalf
+      of any other Contributor, and only if You agree to indemnify,
+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
+
+   END OF TERMS AND CONDITIONS
+
+   APPENDIX: How to apply the Apache License to your work.
+
+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "[]"
+      replaced with your own identifying information. (Don't include
+      the brackets!)  The text should be enclosed in the appropriate
+      comment syntax for the file format. We also recommend that a
+      file or class name and description of purpose be included on the
+      same "printed page" as the copyright notice for easier
+      identification within third-party archives.
+
+   Copyright 2018- Knut Ahlers <knut@ahlers.me>
+
+   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.
+

README.md

@@ -0,0 +1,14 @@
+# luzifer-ansible / telegraf
+
+This role installs telegraf on a host, configures its startup parameters and enables it as a systemd daemon.
+
+## Requirements
+
+- Debian >= 8 (jessie)
+- Ubuntu >= 16.04 (xenial)
+
+## Usage
+
+See the [Ansible Galaxy Intro](https://galaxy.ansible.com/intro) for usage of roles within Ansible Galaxy.
+
+For configuration variables and how to use them see [defaults/main.yml](defaults/main.yml).

defaults/main.yml

@@ -0,0 +1,11 @@
+---
+
+# See telegraf_agent_.* in templates/telegraf.conf.j2
+
+telegraf_global_tags: {}
+telegraf_outputs: {}
+telegraf_inputs: {}
+
+telegraf_version: "1.6.1"
+
+...

meta/main.yml

@@ -0,0 +1,36 @@
+---
+galaxy_info:
+  author: Knut Ahlers
+  description: |
+    Install and configure telegraf on host
+
+  license: Apache
+  min_ansible_version: 2.3
+
+  platforms:
+  - name: Ubuntu
+    versions:
+      - xenial
+  - name: Debian
+    versions:
+      - jessie
+      - stretch
+
+  categories:
+    #- cloud
+    #- cloud:ec2
+    #- cloud:gce
+    #- cloud:rax
+    #- clustering
+    #- database
+    #- database:nosql
+    #- database:sql
+    #- development
+    - monitoring
+    #- networking
+    #- packaging
+    #- system
+    #- web
+
+dependencies:
+  - config_encoder_filters

tasks/main.yml

@@ -0,0 +1,66 @@
+---
+
+- name: Get current telegraf version
+  shell: "/usr/local/bin/telegraf version || true"
+  check_mode: no
+  register: telegraf_version_cmd
+
+- name: Download and unpack telegraf release
+  unarchive:
+    src: 'https://dl.influxdata.com/telegraf/releases/telegraf-{{ telegraf_version }}-static_linux_amd64.tar.gz'
+    remote_src: true
+    dest: /tmp
+  when: telegraf_version not in telegraf_version_cmd.stdout
+
+- name: Move telegraf to expected position
+  command: mv /tmp/telegraf/telegraf /usr/local/bin/telegraf
+  when: telegraf_version not in telegraf_version_cmd.stdout
+
+- name: Cleanup tmp folder
+  file:
+    dest: /tmp/telegraf
+    state: absent
+  when: telegraf_version not in telegraf_version_cmd.stdout
+
+- name: Install systemd service
+  copy:
+    content: |
+      [Unit]
+      Description=Telegraf monitoring
+      After=network-online.target
+      Requires=network-online.target
+
+      [Service]
+      TimeoutStartSec=0
+      TimeoutStopSec=0
+      Restart=on-failure
+      RestartSec=10
+      SyslogIdentifier=telegraf
+      ExecStart=/usr/local/bin/telegraf --config /etc/telegraf.conf
+
+      [Install]
+      WantedBy=multi-user.target
+    dest: /etc/systemd/system/telegraf.service
+  register: telegraf_service
+
+- name: Enable systemd service
+  systemd:
+    name: telegraf
+    enabled: true
+    daemon_reload: true
+
+- name: Write telegraf.conf file
+  template:
+    src: templates/telegraf.conf.j2
+    dest: /etc/telegraf.conf 
+    mode: 0600
+    owner: root
+  register: telegraf_config
+
+- name: Restart systemd service
+  systemd:
+    name: telegraf
+    state: restarted
+  when: packer_build_name is not defined and (telegraf_service.changed or telegraf_config.changed)
+
+...

templates/telegraf.conf.j2

@@ -0,0 +1,73 @@
+# {{ ansible_managed }}
+
+[global_tags]
+{% for k,v in telegraf_global_tags.items() %}
+  {{ k }} = "{{ v }}"
+{% endfor %}
+
+# Configuration for telegraf agent
+[agent]
+  ## Default data collection interval for all inputs
+  interval = "{{ telegraf_agent_interval | default('10s') }}"
+  ## Rounds collection interval to 'interval'
+  ## ie, if interval="10s" then always collect on :00, :10, :20, etc.
+  round_interval = {{ telegraf_agent_round_interval | default(true) | to_nice_json }}
+
+  ## Telegraf will send metrics to outputs in batches of at most
+  ## metric_batch_size metrics.
+  ## This controls the size of writes that Telegraf sends to output plugins.
+  metric_batch_size = {{ telegraf_agent_metric_batch_size | default(1000) }}
+
+  ## For failed writes, telegraf will cache metric_buffer_limit metrics for each
+  ## output, and will flush this buffer on a successful write. Oldest metrics
+  ## are dropped first when this buffer fills.
+  ## This buffer only fills when writes fail to output plugin(s).
+  metric_buffer_limit = {{ telegraf_agent_metric_buffer_limit | default(10000) }}
+
+  ## Collection jitter is used to jitter the collection by a random amount.
+  ## Each plugin will sleep for a random time within jitter before collecting.
+  ## This can be used to avoid many plugins querying things like sysfs at the
+  ## same time, which can have a measurable effect on the system.
+  collection_jitter = "{{ telegraf_agent_collection_jitter | default('0s') }}"
+
+  ## Default flushing interval for all outputs. You shouldn't set this below
+  ## interval. Maximum flush_interval will be flush_interval + flush_jitter
+  flush_interval = "{{ telegraf_agent_flush_interval | default('10s') }}"
+  ## Jitter the flush interval by a random amount. This is primarily to avoid
+  ## large write spikes for users running a large number of telegraf instances.
+  ## ie, a jitter of 5s and interval 10s means flushes will happen every 10-15s
+  flush_jitter = "{{ telegraf_agent_flush_jitter | default('0s') }}"
+
+  ## By default or when set to "0s", precision will be set to the same
+  ## timestamp order as the collection interval, with the maximum being 1s.
+  ##   ie, when interval = "10s", precision will be "1s"
+  ##       when interval = "250ms", precision will be "1ms"
+  ## Precision will NOT be used for service inputs. It is up to each individual
+  ## service input to set the timestamp at the appropriate precision.
+  ## Valid time units are "ns", "us" (or "µs"), "ms", "s".
+  precision = "{{ telegraf_agent_precision | default('') }}"
+
+  ## Logging configuration:
+  ## Run telegraf with debug log messages.
+  debug = {{ telegraf_agent_debug | default(false) | to_nice_json }}
+  ## Run telegraf in quiet mode (error log messages only).
+  quiet = {{ telegraf_agent_quiet | default(false) | to_nice_json }}
+  ## Specify the log file name. The empty string means to log to stderr.
+  logfile = "{{ telegraf_agent_logfile | default('') }}"
+
+  ## Override default hostname, if empty use os.Hostname()
+  hostname = "{{ telegraf_agent_hostname | default('') }}"
+  ## If set to true, do no set the "host" tag in the telegraf agent.
+  omit_hostname = {{ telegraf_agent_omit_hostname | default(false) | to_nice_json }}
+
+{% for name, config in telegraf_outputs.items() %}
+[[ outputs.{{ name }} ]]
+  {{ config | encode_toml }}
+{% endfor %}
+
+{% for name, config in telegraf_inputs.items() %}
+[[ inputs.{{ name }} ]]
+  {{ config | encode_toml }}
+{% endfor %}
+
+# vim: set ft=toml: