etcd ssl

The following tutorial will walk you through creating a CA using the openssl command line tools and configuring etcd clients for SSL and client auth.

• Create the CA
• Create an etcd server certificate
• Create an etcd client certificate
• Configuring etcd for SSL
  • Configuring etcd clients for SSL
• Configuring etcd for client auth
  • Configuring etcd clients for client auth

Create the CA

mkdir etcd-ca
cd etcd-ca

mkdir private certs newcerts crl
wget https://raw.githubusercontent.com/kelseyhightower/etcd-production-setup/master/openssl.cnf
touch index.txt
echo '01' > serial

Create the CA Certificate and Key

openssl req -config openssl.cnf -new -x509 -extensions v3_ca \
  -keyout private/ca.key -out certs/ca.crt

Type ca.etcd.example.com at the Common Name (FQDN) []: prompt.

Verify the CA Certificate

openssl x509 -in certs/ca.crt -noout -text

Create an etcd server certificate

If you want cert verification to work with IPs in addition to hostnames, be sure to set the SAN env var:

export SAN="IP:127.0.0.1, IP:10.0.1.10"

openssl req -config openssl.cnf -new -nodes \
  -keyout private/etcd0.example.com.key -out etcd0.example.com.csr

Type etcd0.example.com at the Common Name (FQDN) []: prompt.

Sign the cert

openssl ca -config openssl.cnf -extensions etcd_server \
  -keyfile private/ca.key \
  -cert certs/ca.crt \
  -out certs/etcd0.example.com.crt -infiles etcd0.example.com.csr

Verify the etcd Server Certificate

openssl x509 -in certs/etcd0.example.com.crt -noout -text

Create an etcd client certificate

unset SAN

openssl req -config openssl.cnf -new -nodes \
  -keyout private/etcd-client.key -out etcd-client.csr

openssl ca -config openssl.cnf -extensions etcd_client \
  -keyfile private/ca.key \
  -cert certs/ca.crt \
  -out certs/etcd-client.crt -infiles etcd-client.csr

Type etcd-client at the Common Name (FQDN) []: prompt.

Configuring etcd for SSL

Configure etcd

$ etcd --advertise-client-urls https://etcd0.example.com:2379 \
  --listen-client-urls https://10.0.1.10:2379 \
  --cert-file etcd0.example.com.crt \
  --key-file etcd0.example.com.key

Configuring etcd clients for SSL

cURL

$ curl --cacert ca.crt -XPUT -v https://etcd0.example.com:2379/v2/keys/foo -d value=bar

$ curl --cacert ca.crt -v https://etcd0.example.com:2379/v2/keys

etcdctl

$ etcdctl -C https://etcd0.example.com:2379 --ca-file ca.crt set foo bar 

etcdctl -C https://etcd0.example.com:2379 --ca-file ca.crt get foo

Configuring etcd for client auth

$ etcd --advertise-client-urls https://etcd0.example.com:2379 \
  --listen-client-urls https://10.0.1.10:2379 \
  --cert-file etcd0.example.com.crt \
  --key-file etcd0.example.com.key \
  --ca-file ca.crt

Notice the usage of the --ca-file flag. This is what enables client auth.

Configuring etcd clients for client auth

etcdctl

$ etcdctl -C https://etcd0.example.com:2379 \
  --cert-file etcd-client.crt \
  --key-file etcd-client.key \
  --ca-file ca.crt \
  get foo