Puppet Class: profile::etcd::v3

Defined in:
modules/profile/manifests/etcd/v3.pp

Overview

Class profile::etcd::v3

Installs an etcd version 3 server, as part of a cluster

Parameters

cluster_name

name of the cluster. Required

cluster_bootstrap

Boolean. true if just bootstrapping the cluster. Defaults to false

discovery

Can be either 'dns:domain_name', which means that the cluster composition will be discovered with _etcd-server._tcp.$cluster_name, or a comma-separated list of peers in the form name=peer_url. Required

use_client_certs

Boolean. Whether to set up TLS client cert based auth. Required

allow_from

Networks authorized to connect to the server. Required

max_latency

Maximum RTT between current cluster nodes. Required

adv_client_port

Port to advertise to clients. If you're using an auth/TLS terminator (as we do in v2 for RBAC) you will need to advertise its port to the public rather than port 2379 (where etcd listens). Required

do_backup

Boolean. Whether to back up the data on etcd or not. Defaults to false on first deploy for backwards compatibility.

*use_pki_certs

Boolean. Whether to use the CFSSL based PKI to generate certificates, or to use the older Puppet CA based certificates. Defaults to false.

Parameters:

  • cluster_name (String) (defaults to: lookup('profile::etcd::v3::cluster_name'))
  • cluster_bootstrap (Boolean) (defaults to: lookup('profile::etcd::v3::cluster_bootstrap', {'default_value' => false}))
  • discovery (String) (defaults to: lookup('profile::etcd::v3::discovery'))
  • use_client_certs (Boolean) (defaults to: lookup('profile::etcd::v3::use_client_certs'))
  • allow_from (String) (defaults to: lookup('profile::etcd::v3::allow_from'))
  • max_latency (Integer) (defaults to: lookup('profile::etcd::v3::max_latency'))
  • adv_client_port (Stdlib::Port) (defaults to: lookup('profile::etcd::v3::adv_client_port'))
  • do_backup (Boolean) (defaults to: lookup('profile::etcd::v3::do_backup', {'default_value' => false}))
  • use_pki_certs (Boolean) (defaults to: lookup('profile::etcd::v3::use_pki_certs', {'default_value' => false})) 


40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
 
# File 'modules/profile/manifests/etcd/v3.pp', line 40

class profile::etcd::v3(
    # Configuration
    String $cluster_name = lookup('profile::etcd::v3::cluster_name'),
    Boolean $cluster_bootstrap = lookup('profile::etcd::v3::cluster_bootstrap', {'default_value' => false}),
    String $discovery = lookup('profile::etcd::v3::discovery'),
    Boolean $use_client_certs = lookup('profile::etcd::v3::use_client_certs'),
    String $allow_from = lookup('profile::etcd::v3::allow_from'),
    Integer $max_latency = lookup('profile::etcd::v3::max_latency'),
    Stdlib::Port $adv_client_port = lookup('profile::etcd::v3::adv_client_port'),
    Boolean $do_backup = lookup('profile::etcd::v3::do_backup', {'default_value' => false}),
    Boolean $use_pki_certs = lookup('profile::etcd::v3::use_pki_certs', {'default_value' => false}),
) {
    # Parameters mangling
    $cluster_state = $cluster_bootstrap ? {
        true    => 'new',
        default => 'existing',
    }

    if $discovery =~ /dns:(.*)/ {
        $peers_list = undef
        $srv_dns = $1
        $certname = "_etcd-server-ssl._tcp.${srv_dns}"
    } else {
        $peers_list = $discovery
        $srv_dns = undef
        $certname = $::fqdn
    }

    # TLS certs *for etcd use* in peer-to-peer communications,
    # tlsproxy will use other certificates.
    # According to https://github.com/etcd-io/etcd/commit/4e21f87e3d014d606bb3ba2a89731a7d24806611
    # etcd does reload the certificate from disc for every client
    # connection. So there is no need to notify the etcd service
    # on certificate renewals.

    # This option uses the puppet CA based certificates
    if ! $use_pki_certs {
        sslcert::certificate { $certname:
            skip_private => false,
            group        => 'etcd',
            require      => Package['etcd-server'],
            before       => Service['etcd'],
        }

        $ssl_paths = {
            'chained' => "/etc/ssl/localcerts/${certname}.crt",
            'key'     => "/etc/ssl/private/${certname}.key",
        }
    }
    # This option allows the CFSSL based PKI to be used with the etcd intermediate
    else {
        # From etcd 3.3+ (bullseye version+) if we use discovery SRV records,
        # we'll also need to add a SAN with the "domain_name: in "dns:domain_name"
        # See T329556
        if debian::codename::ge('bullseye') and $srv_dns != undef {
            $ssl_hosts = [$facts['networking']['fqdn'], $srv_dns]
        } else {
            $ssl_hosts = [$facts['networking']['fqdn']]
        }
        $ssl_paths = profile::pki::get_cert('etcd', $certname, {
            hosts           => $ssl_hosts,
            owner           => 'etcd',
            outdir          => '/var/lib/etcd/ssl',
            before_services => ['etcd'],
        })
    }

    # Service
    class { '::etcd::v3':
        cluster_name     => $cluster_name,
        cluster_state    => $cluster_state,
        srv_dns          => $srv_dns,
        peers_list       => $peers_list,
        use_client_certs => $use_client_certs,
        max_latency_ms   => $max_latency,
        adv_client_port  => $adv_client_port,
        trusted_ca       => profile::base::certificates::get_trusted_ca_path(),
        client_cert      => $ssl_paths['chained'],
        client_key       => $ssl_paths['key'],
        peer_cert        => $ssl_paths['chained'],
        peer_key         => $ssl_paths['key'],
    }

    # Monitoring
    class { '::etcd::v3::monitoring':
        endpoint => "https://${::fqdn}:2379"
    }

    # Firewall
    if $allow_from != 'localhost' {
        ferm::service { 'etcd_clients':
            proto  => 'tcp',
            port   => $adv_client_port,
            srange => $allow_from,
        }
    }

    firewall::service { 'etcd_peers':
        proto    => 'tcp',
        port     => 2380,
        src_sets => ['DOMAIN_NETWORKS'],
    }

    # Allow all etcd cluster nodes to connect to each other
    # via client port.
    if $peers_list != undef {
        # If peers are defined in hiera, use the list directly
        $peers = split($peers_list, ',')
    } else {
        # If peers are defined via DNS, resolve the SRV record from $certname
        $peers = dnsquery::srv($certname).map |$srv| { $srv['target'] }
    }
    firewall::service { 'etcd_peers_client_port':
        proto  => 'tcp',
        port   => $adv_client_port,
        srange => sort($peers),
    }

    # Backup
    if $do_backup {
        # Back up etcd
        class { '::etcd::backup':
            cluster_name => $cluster_name,
        }

        backup::set { 'etcd': }
    }
}