feat: Add cadvisor role

Add a role to deploy https://github.com/google/cadvisor.

Signed-off-by: SuperQ <superq@gmail.com>

roles/cadvisor/README.md

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+<p><img src="https://www.circonus.com/wp-content/uploads/2015/03/sol-icon-itOps.png" alt="graph logo" title="graph" align="right" height="60" /></p>
+
+# Ansible Role: cadvisor
+
+## Description
+
+Deploy [cadvisor](https://github.com/google/cadvisor) using ansible.
+
+## Requirements
+
+- Ansible >= 2.9 (It might work on previous versions, but we cannot guarantee it)
+- gnu-tar on Mac deployer host (`brew install gnu-tar`)
+- Passlib is required when using the basic authentication feature (`pip install passlib[bcrypt]`)
+
+## Role Variables
+
+All variables which can be overridden are stored in [defaults/main.yml](defaults/main.yml) file as well as in [meta/argument_specs.yml](meta/argument_specs.yml).
+Please refer to the [collection docs](https://prometheus-community.github.io/ansible/branch/main/cadvisor_role.html) for description and default values of the variables.
+
+## Example
+
+### Playbook
+
+Use it in a playbook as follows:
+```yaml
+- hosts: all
+  roles:
+    - prometheus.prometheus.cadvisor
+```
+
+### Demo site
+
+We provide an example site that demonstrates a full monitoring solution based on prometheus and grafana. The repository with code and links to running instances is [available on github](https://github.com/superq/demo-site) and the site is hosted on [DigitalOcean](https://digitalocean.com).
+
+## Local Testing
+
+The preferred way of locally testing the role is to use Docker and [molecule](https://github.com/ansible-community/molecule) (v3.x). You will have to install Docker on your system. See "Get started" for a Docker package suitable for your system. Running your tests is as simple as executing `molecule test`.
+
+## Continuous Integration
+
+Combining molecule and circle CI allows us to test how new PRs will behave when used with multiple ansible versions and multiple operating systems. This also allows use to create test scenarios for different role configurations. As a result we have quite a large test matrix which can take more time than local testing, so please be patient.
+
+## Contributing
+
+See [contributor guideline](CONTRIBUTING.md).
+
+## Troubleshooting
+
+See [troubleshooting](TROUBLESHOOTING.md).
+
+## License
+
+This project is licensed under MIT License. See [LICENSE](/LICENSE) for more details.

roles/cadvisor/TROUBLESHOOTING.md

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+# Troubleshooting
+
+## Bad requests (HTTP 400)
+
+This role downloads checksums from the Github project to verify the integrity of artifacts installed on your servers. When downloading the checksums, a "bad request" error might occur.
+
+This happens in environments which (knowningly or unknowling) use the [netrc mechanism](https://www.gnu.org/software/inetutils/manual/html_node/The-_002enetrc-file.html) to auto-login into servers.
+
+Unless netrc is needed by your playbook and ansible roles, please unset the var like so:
+
+```
+$ NETRC= ansible-playbook ...
+```
+
+Or:
+
+```
+$ export NETRC=
+$ ansible-playbook ...
+```

roles/cadvisor/defaults/main.yml

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+---
+cadvisor_version: 0.47.2
+cadvisor_binary_local_dir: ""
+cadvisor_binary_url: "https://github.com/{{ _cadvisor_repo }}/releases/download/v{{ cadvisor_version }}/\
+                      cadvisor-v{{ cadvisor_version }}-linux-{{ go_arch }}"
+cadvisor_skip_install: false
+
+cadvisor_listen_ip: "0.0.0.0"
+cadvisor_port: "8080"
+cadvisor_prometheus_endpoint: "/metrics"
+
+cadvisor_binary_install_dir: "/usr/local/bin"
+cadvisor_system_group: "root"
+cadvisor_system_user: "{{ cadvisor_system_group }}"

roles/cadvisor/handlers/main.yml

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+---
+- name: Restart cadvisor
+  listen: "restart cadvisor"
+  become: true
+  ansible.builtin.systemd:
+    daemon_reload: true
+    name: cadvisor
+    state: restarted
+  when:
+    - not ansible_check_mode

roles/cadvisor/meta/argument_specs.yml

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+---
+# yamllint disable rule:line-length
+argument_specs:
+  main:
+    short_description: "cAdvisor"
+    description:
+      - "Deploy L(cadvisor,https://github.com/google/cadvisor) using ansible"
+    author:
+      - "Prometheus Community"
+    options:
+      cadvisor_version:
+        description: "cAdvisor package version. Also accepts latest as parameter."
+        default: "0.47.2"
+      cadvisor_skip_install:
+        description: "cAdvisor installation tasks gets skipped when set to true."
+        type: bool
+        default: false
+      cadvisor_binary_local_dir:
+        description:
+          - "Enables the use of local packages instead of those distributed on github."
+          - "The parameter may be set to a directory where the C(cadvisor) binary is stored on the host where ansible is run."
+          - "This overrides the I(cadvisor_version) parameter"
+      cadvisor_binary_url:
+        description: "URL of the cadvisor binary file"
+        default: "https://github.com/{{ _cadvisor_repo }}/releases/download/v{{ cadvisor_version }}/cadvisor-{{ cadvisor_version }}-linux-{{ go_arch }}"
+      cadvisor_listen_ip:
+        description: "Address on which cadvisor will listen"
+        default: "0.0.0.0"
+      cadvisor_port:
+        description: "Port on which cadvisor will listen"
+        default: "8080"
+      cadvisor_prometheus_endpoint:
+        description: "Path under which to expose metrics"
+        default: "/metrics"
+      cadvisor_binary_install_dir:
+        description:
+          - "I(Advanced)"
+          - "Directory to install cadvisor binary"
+        default: "/usr/local/bin"
+      cadvisor_system_group:
+        description:
+          - "I(Advanced)"
+          - "System group for cadvisor"
+        default: "root"
+      cadvisor_system_user:
+        description:
+          - "I(Advanced)"
+          - "cAdvisor user"
+        default: "root"

roles/cadvisor/meta/main.yml

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+---
+galaxy_info:
+  author: "cAdvisor Authors"
+  description: "cAdvisor"
+  license: "Apache"
+  min_ansible_version: "2.9"
+  platforms:
+    - name: "Ubuntu"
+      versions:
+        - "focal"
+        - "jammy"
+    - name: "Debian"
+      versions:
+        - "bullseye"
+        - "buster"
+    - name: "EL"
+      versions:
+        - "7"
+        - "8"
+        - "9"
+    - name: "Fedora"
+      versions:
+        - "37"
+        - '38'
+  galaxy_tags:
+    - "monitoring"
+    - "prometheus"
+    - "exporter"
+    - "metrics"
+    - "system"

roles/cadvisor/molecule/alternative/molecule.yml

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+---
+provisioner:
+  inventory:
+    group_vars:
+      all:
+        cadvisor_binary_local_dir: "/tmp"
+        cadvisor_port: "8000"
+        go_arch: amd64
+        cadvisor_version: 0.47.0

roles/cadvisor/molecule/alternative/prepare.yml

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+---
+- name: Run local preparation
+  hosts: localhost
+  gather_facts: false
+  tasks:
+    - name: Download cadvisor binary to local folder
+      become: false
+      ansible.builtin.get_url:
+        url: "https://github.com/google/cadvisor/releases/download/v{{ cadvisor_version }}/cadvisor-v{{ cadvisor_version }}-linux-{{ go_arch }}"
+        dest: "/tmp/cadvisor-v{{ cadvisor_version }}-linux-{{ go_arch }}"
+        mode: 0644
+      register: _download_binary
+      until: _download_binary is succeeded
+      retries: 5
+      delay: 2
+      check_mode: false
+
+    - name: Link to cadvisor binaries directory
+      become: false
+      ansible.builtin.file:
+        src: "/tmp/cadvisor-v{{ cadvisor_version }}-linux-{{ go_arch }}"
+        dest: "/tmp/cadvisor"
+        state: link
+      check_mode: false

roles/cadvisor/molecule/alternative/tests/test_alternative.py

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+from __future__ import (absolute_import, division, print_function)
+__metaclass__ = type
+
+import os
+import testinfra.utils.ansible_runner
+import pytest
+
+testinfra_hosts = testinfra.utils.ansible_runner.AnsibleRunner(
+    os.environ['MOLECULE_INVENTORY_FILE']).get_hosts('all')
+
+
+def test_service(host):
+    s = host.service("cadvisor")
+    try:
+        assert s.is_running
+    except AssertionError:
+        # Capture service logs
+        journal_output = host.run('journalctl -u cadvisor --since "1 hour ago"')
+        print("\n==== journalctl -u cadvisor Output ====\n")
+        print(journal_output)
+        print("\n============================================\n")
+        raise  # Re-raise the original assertion error
+
+
+def test_protecthome_property(host):
+    s = host.service("cadvisor")
+    p = s.systemd_properties
+    assert p.get("ProtectHome") == "yes"
+
+
+@pytest.mark.parametrize("sockets", [
+    "tcp://127.0.0.1:8000",
+])
+def test_socket(host, sockets):
+    assert host.socket(sockets).is_listening

roles/cadvisor/molecule/default/molecule.yml

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+---
+provisioner:
+  inventory:
+    group_vars:
+      all:
+        cadvisor_port: "8080"

roles/cadvisor/molecule/default/tests/test_default.py

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+from __future__ import (absolute_import, division, print_function)
+__metaclass__ = type
+
+import os
+import testinfra.utils.ansible_runner
+
+testinfra_hosts = testinfra.utils.ansible_runner.AnsibleRunner(
+    os.environ['MOLECULE_INVENTORY_FILE']).get_hosts('all')
+
+
+def test_files(host):
+    files = [
+        "/etc/systemd/system/cadvisor.service",
+        "/usr/local/bin/cadvisor"
+    ]
+    for file in files:
+        f = host.file(file)
+        assert f.exists
+        assert f.is_file
+
+
+def test_permissions_didnt_change(host):
+    dirs = [
+        "/etc",
+        "/root",
+        "/usr",
+        "/var"
+    ]
+    for file in dirs:
+        f = host.file(file)
+        assert f.exists
+        assert f.is_directory
+        assert f.user == "root"
+        assert f.group == "root"
+
+
+def test_user(host):
+    assert host.group("root").exists
+    assert "root" in host.user("root").groups
+    assert host.user("root").shell == "/bin/bash"
+    assert host.user("root").home == "/root"
+
+
+def test_service(host):
+    s = host.service("cadvisor")
+    try:
+        assert s.is_running
+    except AssertionError:
+        # Capture service logs
+        journal_output = host.run('journalctl -u cadvisor --since "1 hour ago"')
+        print("\n==== journalctl -u cadvisor Output ====\n")
+        print(journal_output)
+        print("\n============================================\n")
+        raise  # Re-raise the original assertion error
+
+
+def test_protecthome_property(host):
+    s = host.service("cadvisor")
+    p = s.systemd_properties
+    assert p.get("ProtectHome") == "yes"
+
+
+def test_socket(host):
+    sockets = [
+        "tcp://127.0.0.1:8080"
+    ]
+    for socket in sockets:
+        s = host.socket(socket)
+        assert s.is_listening

roles/cadvisor/molecule/latest/molecule.yml

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+---
+provisioner:
+  inventory:
+    group_vars:
+      all:
+        cadvisor_version: latest

roles/cadvisor/molecule/latest/tests/test_alternative.py

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+from __future__ import (absolute_import, division, print_function)
+__metaclass__ = type
+
+import os
+import testinfra.utils.ansible_runner
+import pytest
+
+testinfra_hosts = testinfra.utils.ansible_runner.AnsibleRunner(
+    os.environ['MOLECULE_INVENTORY_FILE']).get_hosts('all')
+
+
+@pytest.mark.parametrize("files", [
+    "/etc/systemd/system/cadvisor.service",
+    "/usr/local/bin/cadvisor"
+])
+def test_files(host, files):
+    f = host.file(files)
+    assert f.exists
+    assert f.is_file
+
+
+def test_service(host):
+    s = host.service("cadvisor")
+    try:
+        assert s.is_running
+    except AssertionError:
+        # Capture service logs
+        journal_output = host.run('journalctl -u cadvisor --since "1 hour ago"')
+        print("\n==== journalctl -u cadvisor Output ====\n")
+        print(journal_output)
+        print("\n============================================\n")
+        raise  # Re-raise the original assertion error
+
+
+def test_protecthome_property(host):
+    s = host.service("cadvisor")
+    p = s.systemd_properties
+    assert p.get("ProtectHome") == "yes"
+
+
+def test_socket(host):
+    s = host.socket("tcp://0.0.0.0:8080")
+    assert s.is_listening

roles/cadvisor/tasks/configure.yml

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+---
+- name: Copy the cadvisor systemd service file
+  ansible.builtin.template:
+    src: cadvisor.service.j2
+    dest: /etc/systemd/system/cadvisor.service
+    owner: root
+    group: root
+    mode: 0644
+  notify: restart cadvisor
+
+- name: Allow cadvisor port in SELinux on RedHat OS family
+  community.general.seport:
+    ports: "{{ cadvisor_port }}"
+    proto: tcp
+    setype: http_port_t
+    state: present
+  when:
+    - ansible_version.full is version_compare('2.4', '>=')
+    - ansible_selinux.status == "enabled"

roles/cadvisor/tasks/install.yml

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+---
+- name: Create the cadvisor group
+  ansible.builtin.group:
+    name: "{{ cadvisor_system_group }}"
+    state: present
+    system: true
+  when: cadvisor_system_group != "root"
+
+- name: Create the cadvisor user
+  ansible.builtin.user:
+    name: "{{ cadvisor_system_user }}"
+    groups: "{{ cadvisor_system_group }}"
+    append: true
+    shell: /usr/sbin/nologin
+    system: true
+    create_home: false
+    home: /
+  when: cadvisor_system_user != "root"
+
+- name: Get binary
+  when:
+    - cadvisor_binary_local_dir | length == 0
+    - not cadvisor_skip_install
+  block:
+
+    - name: Download cadvisor binary to local folder
+      become: false
+      ansible.builtin.get_url:
+        url: "{{ cadvisor_binary_url }}"
+        dest: "/tmp/cadvisor-v{{ cadvisor_version }}-linux-{{ go_arch }}"
+        mode: '0644'
+      register: _download_binary
+      until: _download_binary is succeeded
+      retries: 5
+      delay: 2
+      delegate_to: localhost
+      check_mode: false
+
+    - name: Propagate cadvisor binaries
+      ansible.builtin.copy:
+        src: "/tmp/cadvisor-v{{ cadvisor_version }}-linux-{{ go_arch }}"
+        dest: "{{ cadvisor_binary_install_dir }}/cadvisor"
+        mode: 0755
+        owner: root
+        group: root
+      notify: restart cadvisor
+      when: not ansible_check_mode
+
+- name: Propagate locally distributed cadvisor binary
+  ansible.builtin.copy:
+    src: "{{ cadvisor_binary_local_dir }}/cadvisor"
+    dest: "{{ cadvisor_binary_install_dir }}/cadvisor"
+    mode: 0755
+    owner: root
+    group: root
+  when:
+    - cadvisor_binary_local_dir | length > 0
+    - not cadvisor_skip_install
+  notify: restart cadvisor

roles/cadvisor/tasks/main.yml

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+---
+- name: Preflight
+  ansible.builtin.include_tasks:
+    file: preflight.yml
+    apply:
+      tags:
+        - cadvisor_install
+        - cadvisor_configure
+        - cadvisor_run
+  tags:
+    - cadvisor_install
+    - cadvisor_configure
+    - cadvisor_run
+
+- name: Install
+  ansible.builtin.include_tasks:
+    file: install.yml
+    apply:
+      become: true
+      tags:
+        - cadvisor_install
+  when:
+    ( not __cadvisor_is_installed.stat.exists ) or
+    ( (__cadvisor_current_version_output.stderr_lines | length > 0)
+      and ((__cadvisor_current_version_output.stderr_lines[0].split(" ")[2] | replace('v', '')) != cadvisor_version) ) or
+    ( (__cadvisor_current_version_output.stdout_lines | length > 0)
+      and ((__cadvisor_current_version_output.stdout_lines[0].split(" ")[2] | replace('v', '')) != cadvisor_version) ) or
+    ( cadvisor_binary_local_dir | length > 0 )
+  tags:
+    - cadvisor_install
+
+- name: SELinux
+  ansible.builtin.include_tasks:
+    file: selinux.yml
+    apply:
+      become: true
+      tags:
+        - cadvisor_configure
+  when: ansible_selinux.status == "enabled"
+  tags:
+    - cadvisor_configure
+
+- name: Configure
+  ansible.builtin.include_tasks:
+    file: configure.yml
+    apply:
+      become: true
+      tags:
+        - cadvisor_configure
+  tags:
+    - cadvisor_configure
+
+- name: Ensure cAdvisor is enabled on boot
+  become: true
+  ansible.builtin.systemd:
+    daemon_reload: true
+    name: cadvisor
+    enabled: true
+    state: started
+  when:
+    - not ansible_check_mode
+  tags:
+    - cadvisor_run

roles/cadvisor/tasks/preflight.yml

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+---
+- name: Assert usage of systemd as an init system
+  ansible.builtin.assert:
+    that: ansible_service_mgr == 'systemd'
+    msg: "This role only works with systemd"
+
+- name: Install package fact dependencies
+  become: true
+  ansible.builtin.package:
+    name: "{{ _pkg_fact_req }}"
+    state: present
+  when: (_pkg_fact_req)
+  vars:
+    _pkg_fact_req: "{% if (ansible_pkg_mgr == 'apt') %}\
+      {{ ('python-apt' if ansible_python_version is version('3', '<') else 'python3-apt') }}
+      {% else %}\
+      {% endif %}"
+
+- name: Gather package facts
+  ansible.builtin.package_facts:
+  when: "not 'packages' in ansible_facts"
+
+- name: Check if cadvisor is installed
+  ansible.builtin.stat:
+    path: "{{ cadvisor_binary_install_dir }}/cadvisor"
+  register: __cadvisor_is_installed
+  check_mode: false
+  tags:
+    - cadvisor_install
+
+- name: Gather currently installed cadvisor version (if any)
+  ansible.builtin.command: "{{ cadvisor_binary_install_dir }}/cadvisor --version"
+  changed_when: false
+  register: __cadvisor_current_version_output
+  check_mode: false
+  when: __cadvisor_is_installed.stat.exists
+  tags:
+    - cadvisor_install
+
+- name: Discover latest version
+  ansible.builtin.set_fact:
+    cadvisor_version: "{{ (lookup('url', 'https://api.github.com/repos/{{ _cadvisor_repo }}/releases/latest', headers=_github_api_headers,
+                            split_lines=False) | from_json).get('tag_name') | replace('v', '') }}"
+  run_once: true
+  until: cadvisor_version is version('0.0.0', '>=')
+  retries: 10
+  when:
+    - cadvisor_version == "latest"
+    - cadvisor_binary_local_dir | length == 0
+    - not cadvisor_skip_install

roles/cadvisor/tasks/selinux.yml

@@ -0,0 +1,23 @@
+---
+- name: Install selinux python packages [RedHat]
+  ansible.builtin.package:
+    name: "{{ ['libselinux-python', 'policycoreutils-python']
+           if ansible_python_version is version('3', '<') else
+           ['python3-libselinux', 'python3-policycoreutils'] }}"
+    state: present
+  register: _install_selinux_packages
+  until: _install_selinux_packages is success
+  retries: 5
+  delay: 2
+  when: ansible_os_family | lower == "redhat"
+
+- name: Install selinux python packages [clearlinux]
+  ansible.builtin.package:
+    name: sysadmin-basic
+    state: present
+  register: _install_selinux_packages
+  until: _install_selinux_packages is success
+  retries: 5
+  delay: 2
+  when:
+    - ansible_distribution | lower == "clearlinux"

roles/cadvisor/templates/cadvisor.service.j2

@@ -0,0 +1,34 @@
+{{ ansible_managed | comment }}
+
+[Unit]
+Description=cAdvisor cgroup/container metrics server
+After=network-online.target
+
+[Service]
+Type=simple
+User={{ cadvisor_system_user }}
+Group={{ cadvisor_system_group }}
+ExecStart={{ cadvisor_binary_install_dir }}/cadvisor \
+    '--listen_ip={{ cadvisor_listen_ip }}' \
+    '--port={{ cadvisor_port }}' \
+    '--prometheus_endpoint={{ cadvisor_prometheus_endpoint }}'
+
+SyslogIdentifier=cadvisor
+Restart=always
+RestartSec=1
+StartLimitInterval=0
+
+ProtectHome=yes
+NoNewPrivileges=yes
+
+{% if (ansible_facts.packages.systemd | first).version is version('232', '>=') %}
+ProtectSystem=strict
+ProtectControlGroups=true
+ProtectKernelModules=true
+ProtectKernelTunables=yes
+{% else %}
+ProtectSystem=full
+{% endif %}
+
+[Install]
+WantedBy=multi-user.target

roles/cadvisor/test-requirements.txt

@@ -0,0 +1 @@
+bcrypt

roles/cadvisor/vars/main.yml

@@ -0,0 +1,10 @@
+---
+go_arch_map:
+  x86_64: 'amd64'
+  aarch64: 'arm64'
+  armv7l: 'arm'
+  armv6l: 'arm'
+
+go_arch: "{{ go_arch_map[ansible_architecture] | default(ansible_architecture) }}"
+_cadvisor_repo: "google/cadvisor"
+_github_api_headers: "{{ {'GITHUB_TOKEN': lookup('ansible.builtin.env', 'GITHUB_TOKEN')} if (lookup('ansible.builtin.env', 'GITHUB_TOKEN')) else {} }}"

tests/integration/targets/molecule-cadvisor-alternative/runme.sh

@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+
+collection_root=$(pwd | grep -oP ".+\/ansible_collections\/\w+?\/\w+")
+source "$collection_root/tests/integration/molecule.sh"

tests/integration/targets/molecule-cadvisor-default/runme.sh

@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+
+collection_root=$(pwd | grep -oP ".+\/ansible_collections\/\w+?\/\w+")
+source "$collection_root/tests/integration/molecule.sh"

tests/integration/targets/molecule-cadvisor-latest/runme.sh

@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+
+collection_root=$(pwd | grep -oP ".+\/ansible_collections\/\w+?\/\w+")
+source "$collection_root/tests/integration/molecule.sh"