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

[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'] %}
DNS.{{ 1 + loop.index }} = {{ host }}
{% endfor %}
{% if loadbalancer_apiserver is defined  and apiserver_loadbalancer_domain_name is defined %}
{% set idx =  groups['etcd'] | length | int + 2 %}
DNS.{{ idx | string }} = {{ apiserver_loadbalancer_domain_name }}
{% endif %}
{% for host in groups['etcd'] %}
IP.{{ 2 * loop.index - 1 }} = {{ hostvars[host]['access_ip'] | default(hostvars[host]['ansible_default_ipv4']['address']) }}
IP.{{ 2 * loop.index }} = {{ hostvars[host]['ip'] | default(hostvars[host]['ansible_default_ipv4']['address']) }}
{% endfor %}
{% set idx =  groups['etcd'] | length | int * 2 + 1 %}
IP.{{ idx }} = 127.0.0.1