ansible : add alloy role

ansible/roles/alloy/defaults/main.yaml

@@ -0,0 +1,14 @@
+---
+
+alloy_version: "1.13.2"
+alloy_log_level: "info"
+alloy_username: "alloy"
+alloy_groupname: "alloy"
+alloy_uid: "1001"
+alloy_gid: "1001"
+alloy_config_directory: "/etc/alloy"
+alloy_config_file: "{{ alloy_config_directory }}/config.alloy"
+alloy_working_directory: "/var/lib/alloy"
+alloy_binary_dir: "/usr/local/bin"
+alloy_run_args: "--stability.level=experimental --server.http.listen-addr='0.0.0.0:12345'"
+alloy_restart_on_upgrade: true

ansible/roles/alloy/handlers/main.yaml

@@ -0,0 +1,10 @@
+---
+
+- name: Restart alloy
+  ansible.builtin.systemd_service:
+    name: "alloy.service"
+    state: restarted
+
+- name: Systemd reload
+  ansible.builtin.systemd_service:
+    daemon_reload: true

ansible/roles/alloy/tasks/main.yaml

@@ -0,0 +1,85 @@
+---
+
+- name: Download and install Alloy binary
+  ansible.builtin.unarchive:
+    src: "https://github.com/grafana/alloy/releases/download/v{{ alloy_version }}/alloy-linux-amd64.zip"
+    dest: "{{ alloy_binary_dir }}"
+    remote_src: true
+  tags: install
+
+- name: Rename binary
+  ansible.builtin.copy:
+    src: "{{ alloy_binary_dir }}/alloy-linux-amd64"
+    dest: "{{ alloy_binary_dir }}/alloy"
+    remote_src: true
+    mode: 0755
+  tags: install
+
+- name: Create Alloy group
+  ansible.builtin.group:
+    name: "{{ alloy_groupname }}"
+    gid: "{{ alloy_gid }}"
+  tags: install
+
+- name: Create Alloy user
+  ansible.builtin.user:
+    name: "{{ alloy_username }}"
+    uid: "{{ alloy_uid }}"
+    group: "{{ alloy_groupname }}"
+    shell: "/bin/false"
+  tags: install
+
+- name: Ensure config directory exists
+  ansible.builtin.file:
+    path: "{{ alloy_config_directory }}"
+    owner: "{{ alloy_username }}"
+    group: "{{ alloy_groupname }}"
+    state: directory
+    mode: "0755"
+  tags: install,config
+
+- name: Ensure working directory exists
+  ansible.builtin.file:
+    path: "{{ alloy_working_directory }}"
+    state: directory
+    owner: "{{ alloy_username }}"
+    group: "{{ alloy_groupname }}"
+    mode: "0755"
+  tags: install
+
+- name: Deploy Alloy config
+  ansible.builtin.template:
+    src: "config.j2"
+    dest: "{{ alloy_config_directory }}/config.alloy"
+    owner: "{{ alloy_username }}"
+    group: "{{ alloy_groupname }}"
+    mode: "0644"
+  notify: Restart alloy
+  tags: install,config
+
+- name: Deploy Alloy default file
+  ansible.builtin.template:
+    src: "default.j2"
+    dest: "/etc/default/alloy"
+    owner: "root"
+    group: "root"
+    mode: 0644
+  notify: Restart alloy
+  tags: install,config
+
+- name: Deploy Alloy systemd config
+  ansible.builtin.template:
+    src: "systemd_service.j2"
+    dest: "/etc/systemd/system/alloy.service"
+    owner: "root"
+    group: "root"
+    mode: 0644
+  tags: install
+
+- name: Start and enable Alloy service
+  ansible.builtin.systemd_service:
+    name: "alloy.service"
+    state: started
+    enabled: true
+    daemon_reload: true
+  tags: install

ansible/roles/alloy/templates/config.j2

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+otelcol.receiver.filelog "file" {
+  include = ["/in/*.log"]
+  operators = [{
+      type = "regex_parser",
+      regex = `^(?P<timestamp>\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}.\d{2}:\d{2}) (?P<msg>.*)$`,
+      timestamp = {
+        parse_from = "attributes.timestamp",
+        layout = "%Y-%m-%dT%H:%M:%S%j",
+      },
+      message = {
+        parse_from = "attributes.msg",
+      },
+    },{
+      type = "remove",
+      field = "attributes.timestamp",
+  }]
+  output {
+    logs = [otelcol.exporter.syslog.outsyslog.input]
+  }
+}
+otelcol.exporter.file "outfile" {
+    path = "/out/output.log"
+}
+
+otelcol.exporter.syslog "outsyslog" {
+    endpoint = "slaithier-promax14"
+}
+
+otelcol.exporter.debug "default" {}
+
+logging {
+  level  = "{{ alloy_log_level }}"
+  format = "logfmt"
+}

ansible/roles/alloy/templates/default.j2

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+# The configuration file holding the Grafana Alloy configuration.
+CONFIG_FILE="{{ alloy_config_file }}"
+
+# User-defined arguments to pass to the run command.
+CUSTOM_ARGS="{{ alloy_run_args }}"
+
+# Restart on system upgrade. Defaults to true.
+RESTART_ON_UPGRADE={{ alloy_restart_on_upgrade }}

ansible/roles/alloy/templates/systemd_service.j2

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+[Unit]
+Description=Vendor-neutral programmable observability pipelines.
+Documentation=https://grafana.com/docs/alloy/
+Wants=network-online.target
+After=network-online.target
+
+[Service]
+Restart=always
+User={{ alloy_username }}
+Group={{ alloy_groupname }}
+Environment=HOSTNAME=%H
+EnvironmentFile=/etc/default/alloy
+WorkingDirectory={{ alloy_working_directory }}
+ExecStart={{ alloy_binary_dir }}/alloy run $CUSTOM_ARGS --storage.path={{ alloy_working_directory }} $CONFIG_FILE
+ExecReload=/usr/bin/env kill -HUP $MAINPID
+TimeoutStopSec=20s
+
+[Install]
+WantedBy=multi-user.target