A Puppet Module to Manage Consul
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README.md

puppet-consul

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Compatibility

WARNING: Backwards incompatible changes happen in order to more easily support new versions of consul. Pin to the version that works for your setup!

Consul Version Recommended Puppet Module Version
>= 0.9.0 latest
0.8.x <= 3.2.4
0.7.0 <= 2.1.1
0.6.0 <= 2.1.1
0.5.x 1.0.3
0.4.x 0.4.6

What This Module Affects

  • Installs the consul daemon (via url or package)
    • If installing from zip, you must ensure the unzip utility is available.
    • If installing from docker, you must ensure puppetlabs-docker_platform module is available.
  • Optionally installs a user to run it under
  • Installs a configuration file (/etc/consul/config.json)
  • Manages the consul service via upstart, sysv, systemd, or nssm.
  • Optionally installs the Web UI

Usage

To set up a single consul server, with several agents attached: On the server:

class { '::consul':
  config_hash => {
    'bootstrap_expect' => 1,
    'data_dir'         => '/opt/consul',
    'datacenter'       => 'east-aws',
    'log_level'        => 'INFO',
    'node_name'        => 'server',
    'server'           => true,
  }
}

On the agent(s):

class { '::consul':
  config_hash => {
    'data_dir'   => '/opt/consul',
    'datacenter' => 'east-aws',
    'log_level'  => 'INFO',
    'node_name'  => 'agent',
    'retry_join' => ['172.16.0.1'],
  }
}

Disable install and service components:

class { '::consul':
  install_method => 'none',
  init_style     => false,
  manage_service => false,
  config_hash => {
    'data_dir'   => '/opt/consul',
    'datacenter' => 'east-aws',
    'log_level'  => 'INFO',
    'node_name'  => 'agent',
    'retry_join' => ['172.16.0.1'],
  }
}

Web UI

To install and run the Web UI on the server, include ui => true in the config_hash. You may also want to change the client_addr to 0.0.0.0 from the default 127.0.0.1, for example:

class { '::consul':
  config_hash => {
    'bootstrap_expect' => 1,
    'client_addr'      => '0.0.0.0',
    'data_dir'         => '/opt/consul',
    'datacenter'       => 'east-aws',
    'log_level'        => 'INFO',
    'node_name'        => 'server',
    'server'           => true,
    'ui'               => true,
  }
}

For more security options, consider leaving the client_addr set to 127.0.0.1 and use with a reverse proxy:

$aliases = ['consul', 'consul.example.com']

# Reverse proxy for Web interface
include 'nginx'

$server_names = [$::fqdn, $aliases]

nginx::resource::vhost { $::fqdn:
  proxy       => 'http://localhost:8500',
  server_name => $server_names,
}

Service Definition

To declare the availability of a service, you can use the service define. This will register the service through the local consul client agent and optionally configure a health check to monitor its availability.

::consul::service { 'redis':
  checks  => [
    {
      script   => '/usr/local/bin/check_redis.py',
      interval => '10s'
    }
  ],
  port    => 6379,
  tags    => ['master']
}

See the service.pp docstrings for all available inputs.

You can also use consul::services which accepts a hash of services, and makes it easy to declare in hiera. For example:

consul::services:
  service1:
    address: "%{::ipaddress}"
    checks:
      - http: http://localhost:42/status
        interval: 5s
    port: 42
    tags:
      - "foo:%{::bar}"
  service2:
    address: "%{::ipaddress}"
    checks:
      - http: http://localhost:43/status
        interval: 5s
    port: 43
    tags:
      - "foo:%{::baz}"

Watch Definitions

::consul::watch { 'my_watch':
  handler     => 'handler_path',
  passingonly => true,
  service     => 'serviceName',
  service_tag => 'serviceTagName',
  type        => 'service',
}

See the watch.pp docstrings for all available inputs.

You can also use consul::watches which accepts a hash of watches, and makes it easy to declare in hiera.

Check Definitions

::consul::check { 'true_check':
  interval => '30s',
  script   => '/bin/true',
}

See the check.pp docstrings for all available inputs.

You can also use consul::checks which accepts a hash of checks, and makes it easy to declare in hiera.

Removing Service, Check and Watch definitions

Do ensure => absent while removing existing service, check and watch definitions. This ensures consul will be reloaded via SIGHUP. If you have purge_config_dir set to true and simply remove the definition it will cause consul to restart.

ACL Definitions

consul_acl { 'ctoken':
  ensure => 'present',
  rules  => {'key' => {'test' => {'policy' => 'read'}}},
  type   => 'client',
}

Do not use duplicate names, and remember that the ACL ID (a read-only property for this type) is used as the token for requests, not the name

Optionally, you may supply an acl_api_token. This will allow you to create ACLs if the anonymous token doesn't permit ACL changes (which is likely). The api token may be the master token, another management token, or any client token with sufficient privileges.

NOTE: This module currently cannot parse ACL tokens generated through means other than this module. Don't mix Puppet and Non-puppet ACLs for best results! (pull requests welcome to allow it to co-exist with ACLs generated with normal HCL)

Prepared Queries and Prepared Query Templates

consul_prepared_query { 'consul':
  ensure               => 'present',
  service_name         => 'consul',
  service_failover_n   => 1,
  service_failover_dcs => [ 'dc1', 'dc2' ],
  service_only_passing => true,
  service_tags         => [ 'tag1', 'tag2' ],
  ttl                  => 10,
}

or a prepared query template:

consul_prepared_query { 'consul':
  ensure               => 'present',
  service_name         => 'consul',
  service_name         => 'consul-${match(1)}' # lint:ignore:single_quote_string_with_variables
  service_failover_n   => 1,
  service_failover_dcs => [ 'dc1', 'dc2' ],
  service_only_passing => true,
  service_tags         => [ '${match(2)}' ], # lint:ignore:single_quote_string_with_variables
  template             => true,
  template_regexp      => '^consul-(.*)-(.*)$',
  template_type        => 'name_prefix_match',
}

Key/Value Objects

Example:

consul_key_value { 'key/path':
  ensure     => 'present',
  value      => 'myvaluestring',
  flags      => 12345,
  datacenter => 'dc1'
}

This provider allows you to manage key/value pairs. It tries to be smart in two ways:

  1. It caches the data accessible from the kv store with the specified acl token.
  2. It does not update the key if the value & flag are already correct.

These parameters are mandatory when using consul_key_value:

  • name Name of the key/value object. Path in key/value store.
  • value value of the key.

The optional parameters only need to be specified if you require changes from default behaviour.

  • flags {Integer} an opaque unsigned integer that can be attached to each entry. Clients can choose to use this however makes sense for their application. Default is 0.
  • acl\_api_token {String} Token for accessing the ACL API. Default is ''.
  • datacenter {String} Use the key/value store in specified datacenter. If '' (default) it will use the datacenter of the Consul agent at the HTTP address.
  • protocol {String} protocol to use. Either 'http' (default) or 'https'.
  • port {Integer} consul port. Defaults to 8500.
  • hostname {String} consul hostname. Defaults to 'localhost'.
  • api_tries {Integer} number of tries when contacting the Consul REST API. Timeouts are not retried because a timeout already takes long. Defaults to 3.

Limitations

Depends on the JSON gem, or a modern ruby. (Ruby 1.8.7 is not officially supported) Depending on the version of puppetserver deployed it may not be new enough (1.8.0 is too old, 2.0.3 is known to work).

Windows Experimental Support

Windows service support is provided by NSSM, which is expected to be installed separately. The following caveats apply:

  • The user and group parameter must be different (Administrator/Administrators recommended).
  • The NSSM executable must be passed as a parameter like in the following example:
class { '::consul':
  nssm_exec   => 'C:/Program Files/nssm/nssm-2.24/win64/nssm.exe',
  bin_dir     => 'C:/Consul',
  user        => 'Administrator',
  group       => 'Administrators',
  config_hash => {
    'bootstrap_expect' => 1,
    'data_dir'         => 'C:/Consul',
    'datacenter'       => 'dc1',
    'log_level'        => 'INFO',
    'node_name'        => 'server',
    'server'           => true,
  }
}

##Telemetry The Consul agent collects various runtime metrics about the performance of different libraries and subsystems. These metrics are aggregated on a ten second interval and are retained for one minute.

To view this data, you must send a signal to the Consul process: on Unix, this is USR1 while on Windows it is BREAK. Once Consul receives the signal, it will dump the current telemetry information to the agent's stderr.

This telemetry information can be used for debugging or otherwise getting a better view of what Consul is doing.

##Usage

class { '::consul':
  config_hash => {
    'bootstrap_expect' => 1,
    'data_dir'         => '/opt/consul',
    'datacenter'       => 'east-aws',
    'log_level'        => 'INFO',
    'node_name'        => 'server',
    'server'           => true,
    'telemetry' => {
       'statsd_address' => 'localhost:9125',
       'prefix_filter' => [
           '+consul.client.rpc',
           '+consul.client.rpc.exceeded',
           '+consul.acl.cache_hit',
           '+consul.acl.cache_miss',
           '+consul.dns.stale_queries',
           '+consul.raft.state.leader',
           '+consul.raft.state.candidate',
           '+consul.raft.apply',
           '+consul.raft.commitTime',
           '+consul.raft.leader.dispatchLog',
           '+consul.raft.replication.appendEntries',
           '+consul.raft.leader.lastContact',
           '+consul.rpc.accept_conn',
           '+consul.catalog.register',
           '+consul.catalog.deregister',
           '+consul.kvs.apply',
           '+consul.leader.barrier',
           '+consul.leader.reconcile',
           '+consul.leader.reconcileMember',
           '+consul.leader.reapTombstones',
           '+consul.rpc.raft_handoff',
           '+consul.rpc.request_error',
           '+consul.rpc.request',
           '+consul.rpc.query',
           '+consul.rpc.consistentRead',
           '+consul.memberlist.msg.suspect',
           '+consul.serf.member.flap',
           '+consul.serf.events',
           '+consul.session_ttl.active',
           ]
        }
    }
}

The metrics for the consul system you can look them in the Official Consul Site with all the description for every metric. Url: https://www.consul.io/docs/agent/telemetry.html

Consul Template

Consul Template is a piece of software to dynamically write out config files using templates that are populated with values from Consul. This module does not configure consul template. See gdhbashton/consul_template for a module that can do that.

Development

Open an issue or fork and open a Pull Request