Add mtail role for thot

monitoring.yml

@@ -63,3 +63,8 @@
 - hosts: redisdead.adm.crans.org
   roles:
     - prometheus-node-exporter-postfix
+
+# Monitor logs with mtail
+- hosts: thot.adm.crans.org
+  roles:
+    - mtail

roles/mtail/handlers/main.yml

+---
+- name: Restart mtail
+  service:
+    name: mtail
+    state: restarted

roles/mtail/tasks/main.yml

+---
+- name: Install mtail
+  apt:
+    update_cache: true
+    name: mtail
+  register: apt_result
+  retries: 3
+  until: apt_result is succeeded
+
+- name: Configure mtail
+  template:
+    src: default/mtail.j2
+    dest: /etc/default/mtail
+  notify: Restart mtail
+
+- name: Copy mtail configurations
+  template:
+    src: "mtail/{{ item }}.j2"
+    dest: "/etc/mtail/{{ item }}"
+  loop:
+    - dhcpd.mtail
+  notify: Restart mtail
+
+- name: Indicate role in motd
+  template:
+    src: update-motd.d/05-service.j2
+    dest: /etc/update-motd.d/05-mtail
+    mode: 0755

roles/mtail/templates/default/mtail.j2

+# {{ ansible_managed }}
+# Set to 1 to start Mtail at boot.
+ENABLED=1
+
+## Log processing.
+
+# List of files to monitor (mandatory).
+LOGS=/var/log/cablage/global.log
+
+## Metrics exporting.
+
+# HTTP port to listen on. (default "3903")
+#PORT=3903
+
+# Path to collectd unixsock to write metrics to.
+#COLLECTD_SOCKETPATH=
+
+# Host:port to graphite carbon server to write metrics to.
+#GRAPHITE_HOSTPORT=
+
+# Host:port to statsd server to write metrics to.
+#STATSD_HOSTPORT=
+
+# Interval between metric pushes, in seconds (default 60)
+#METRIC_PUSH_INTERVAL=
+
+# Extra command-line arguments to pass to the server.
+EXTRA_ARGS=""

roles/mtail/templates/mtail/dhcpd.mtail.j2

+# {{ ansible_managed }}
+# Copyright 2011 Google Inc. All Rights Reserved.
+# This file is available under the Apache license.
+
+# Define the exported metric names.  The `by' keyword indicates the metric has
+# dimensions.  For example, `request_total' counts the frequency of each
+# request's "command".  The name `command' will be exported as the label name
+# for the metric.  The command provided in the code below will be exported as
+# the label value.
+counter dhcpd_request_total by command
+counter dhcpd_config_file_errors
+counter dhcpd_peer_disconnects
+counter dhcpd_dhcpdiscovers
+counter dhcpd_bind_xid_mismatch
+counter dhcpd_duplicate_lease
+counter dhcpd_bad_udp_checksum
+counter dhcpd_unknown_subnet
+counter dhcpd_dhcpdiscover_nofree by network
+counter dhcpd_unknown_lease by ip
+counter dhcpd_update_rejected
+counter dhcpd_failover_peer_timeout
+counter dhcpd_ip_already_in_use
+counter dhcpd_ip_abandoned by reason
+counter dhcpd_invalid_state_transition
+counter dhcpd_negative_poolreq by pool
+counter dhcpd_lease_conflicts
+
+# The `syslog' decorator defines a procedure.  When a block of mtail code is
+# "decorated", it is called before entering the block.  The block is entered
+# when the keyword `next' is reached.
+def syslog {
+  /^(?P<date>(?P<legacy_date>\w+\s+\d+\s+\d+:\d+:\d+)|(?P<rfc3339_date>\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}.\d+[+-]\d{2}:\d{2}))/ +
+  /\s+(?:\w+@)?(?P<hostname>[\w\.-]+)\s+(?P<application>[\w\.-]+)(?:\[(?P<pid>\d+)\])?:\s+(?P<message>.*)/ {
+    # If the legacy_date regexp matched, try this format.
+    len($legacy_date) > 0 {
+      strptime($2, "Jan _2 15:04:05")
+    }
+    # If the RFC3339 style matched, parse it this way.
+    len($rfc3339_date) > 0 {
+      strptime($rfc3339_date, "2006-01-02T15:04:05.999999999Z07:00")
+    }
+    # Call into the decorated block
+    next
+  }
+}
+
+# Define some pattern constants for reuse in the patterns below.
+const IP /\d+(\.\d+){3}/
+const MATCH_IP /(?P<ip>/ + IP + /)/
+const MATCH_NETWORK /(?P<network>\d+(\.\d+){1,3}\/\d+)/
+const MATCH_MAC /(?P<mac>([\da-f]{2}:){5}[\da-f]{2})/
+    
+@syslog {
+    # Request
+    /(balanced|balancing|BOOTREPLY|BOOTREQUEST|DHCPACK|DHCPDECLINE|DHCPDISCOVER|DHCPINFORM|DHCPNAK|DHCPOFFER|DHCPRELEASE|DHCPREQUEST)/ {
+        # The lowercased name of the command matched in the regex is used to
+        # count the frequency of each command.  An external collector can use
+        # this to compute the rate of each command independently.
+        dhcpd_request_total[tolower($1)]++
+
+        # DHCP Discover
+        /DHCPDISCOVER from / + MATCH_MAC {
+            # Counts the discovery requests.
+            dhcpd_dhcpdiscovers++
+
+            /network / + MATCH_NETWORK + /: no free leases/ {
+                # If the range is full, your clients may be having a bad time.
+                dhcpd_dhcpdiscover_nofree[$network]++
+            }
+        }
+
+    }
+
+    # Config file errors
+    /Configuration file errors encountered -- exiting/ {
+        # Counting config parse errors can he useful for detecting bad config
+        # pushes that made it to production.
+        dhcpd_config_file_errors++
+    }
+
+    # Peer disconnects
+    /peer ([^:]+): disconnected/ {
+        dhcpd_peer_disconnects++
+    }
+
+    # XID mismatches
+    /bind update on / + IP + / got ack from (?P<group>\w+): xid mismatch./ {
+        dhcpd_bind_xid_mismatch++
+    }
+
+    # Duplicate lease
+    /uid lease / + MATCH_IP + / for client / + MATCH_MAC + / is duplicate on / + MATCH_NETWORK {
+        dhcpd_duplicate_lease++
+    }
+
+    # Bad UDP Checksum
+    /(?P<count>\d+) bad udp checksums in \d+ packets/ {
+        dhcpd_bad_udp_checksum += $count
+    }
+
+    # Unknown subnet
+    /DHCPDISCOVER from / + MATCH_MAC + / via / + IP + /: unknown network segment/ {
+        dhcpd_unknown_subnet++
+    }
+
+    # Unknown lease
+    /DHCPREQUEST for / + IP + /\(/ + IP + /\) from / + MATCH_MAC + / via / + IP + /: unknown lease / + MATCH_IP {
+        dhcpd_unknown_lease[$ip]++
+    }
+
+    # Update rejected
+    /bind update on \S+ from \S+ rejected: incoming update is less critical than the outgoing update/ {
+        dhcpd_update_rejected++
+    }
+    
+    /timeout waiting for failover peer \S+/ {
+        dhcpd_failover_peer_timeout++
+    }
+    
+    /ICMP Echo reply while lease / + IP + /valid/ {
+        dhcpd_ip_already_in_use++
+    }
+    
+    /unexpected ICMP Echo reply from / + IP {
+        dhcpd_ip_already_in_use++
+    }
+    
+    /Abandoning IP address / + IP + /: (?P<reason>.*)/ {
+        dhcpd_ip_abandoned[$reason]++
+    }
+
+    /bind update on \S+ from \S+ rejected: / + IP + /: invalid state transition/ {
+        dhcpd_invalid_state_transition++
+    }
+
+    /peer (?P<pool>[^:]+): Got POOLREQ, answering negatively!/ {
+        dhcpd_negative_poolreq[$pool]++
+    }
+
+    /Lease conflict at/ {
+        dhcpd_lease_conflicts++
+    }
+}

roles/mtail/templates/update-motd.d/05-service.j2

+#!/usr/bin/tail +3
+# {{ ansible_managed }}
+> mtail a été déployé sur cette machine. Voir /etc/mtail/.