kubespray/roles/etcd/templates/openssl.conf.j2

{% set counter = {'dns': 2,'ip': 1,} %}{% macro increment(dct, key, inc=1)%}{% if dct.update({key: dct[key] + inc}) %} {% endif %}{% endmacro %}[req]
req_extensions = v3_req
distinguished_name = req_distinguished_name

[req_distinguished_name]

[ v3_req ]
basicConstraints = CA:FALSE
keyUsage = nonRepudiation, digitalSignature, keyEncipherment
subjectAltName = @alt_names

[ ssl_client ]
extendedKeyUsage = clientAuth, serverAuth
basicConstraints = CA:FALSE
subjectKeyIdentifier=hash
authorityKeyIdentifier=keyid,issuer
subjectAltName = @alt_names

[ v3_ca ]
basicConstraints = CA:TRUE
keyUsage = nonRepudiation, digitalSignature, keyEncipherment
subjectAltName = @alt_names
authorityKeyIdentifier=keyid:always,issuer

[alt_names]
DNS.1 = localhost
{% for host in groups['etcd'] %}
{% if hostvars[host]['etcd_access_address'] is defined and not (hostvars[host]['etcd_access_address'] | ansible.utils.ipaddr) %}
{# If defined, the address which etcd uses to access its members must be included in the SAN, otherwise etcd will fail with a TLS error upon startup. #}
DNS.{{ counter["dns"] }} = {{ hostvars[host]['etcd_access_address'] }}{{ increment(counter, 'dns') }}
{% endif %}
{# This will always expand to inventory_hostname, which can be a completely arbitrary name, that etcd will not know or care about, hence this line is (probably) redundant. #}
DNS.{{ counter["dns"] }} = {{ host }}{{ increment(counter, 'dns') }}
{% endfor %}
{% if apiserver_loadbalancer_domain_name is defined %}
DNS.{{ counter["dns"] }} = {{ apiserver_loadbalancer_domain_name }}{{ increment(counter, 'dns') }}
{% endif %}
{% for etcd_alt_name in etcd_cert_alt_names %}
DNS.{{ counter["dns"] }} = {{ etcd_alt_name }}{{ increment(counter, 'dns') }}
{% endfor %}
{% for host in groups['etcd'] %}
{% if hostvars[host]['access_ip'] is defined  %}
IP.{{ counter["ip"] }} = {{ hostvars[host]['access_ip'] }}{{ increment(counter, 'ip') }}
{% endif %}
IP.{{ counter["ip"] }} = {{ hostvars[host]['ip'] | default(fallback_ips[host]) }}{{ increment(counter, 'ip') }}
{% endfor %}
{% for cert_alt_ip in etcd_cert_alt_ips %}
IP.{{ counter["ip"] }} = {{ cert_alt_ip }}{{ increment(counter, 'ip') }}
{% endfor %}
IP.{{ counter["ip"] }} = 127.0.0.1