7.6.20. etcd의 TLS 암호 지정

yum update etcd iptables-services

# yum update etcd iptables-services

etcd --version

# etcd --version
etcd Version: 3.2.22

servingInfo:
  ...
  minTLSVersion: VersionTLS12
  cipherSuites:
  - TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
  - TLS_RSA_WITH_AES_256_CBC_SHA
  - TLS_RSA_WITH_AES_128_CBC_SHA
...

servingInfo:
  ...
  minTLSVersion: VersionTLS12
  cipherSuites:
  - TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
  - TLS_RSA_WITH_AES_256_CBC_SHA
  - TLS_RSA_WITH_AES_128_CBC_SHA
...

master-restart api
master-restart controllers

# master-restart api
# master-restart controllers

openssl s_client -connect etcd1.example.com:2379

# openssl s_client -connect etcd1.example.com:2379 

CONNECTED(00000003)
depth=0 CN = etcd1.example.com
verify error:num=20:unable to get local issuer certificate
verify return:1
depth=0 CN = etcd1.example.com
verify error:num=21:unable to verify the first certificate
verify return:1
139905367488400:error:14094412:SSL routines:ssl3_read_bytes:sslv3 alert bad certificate:s3_pkt.c:1493:SSL alert number 42
139905367488400:error:140790E5:SSL routines:ssl23_write:ssl handshake failure:s23_lib.c:177:
---
Certificate chain
 0 s:/CN=etcd1.example.com
   i:/CN=etcd-signer@1529635004
---
Server certificate
-----BEGIN CERTIFICATE-----
MIIEkjCCAnqgAwIBAgIBATANBgkqhkiG9w0BAQsFADAhMR8wHQYDVQQDDBZldGNk
........
....
eif87qttt0Sl1vS8DG1KQO1oOBlNkg==
-----END CERTIFICATE-----
subject=/CN=etcd1.example.com
issuer=/CN=etcd-signer@1529635004
---
Acceptable client certificate CA names
/CN=etcd-signer@1529635004
Client Certificate Types: RSA sign, ECDSA sign
Requested Signature Algorithms: RSA+SHA256:ECDSA+SHA256:RSA+SHA384:ECDSA+SHA384:RSA+SHA1:ECDSA+SHA1
Shared Requested Signature Algorithms: RSA+SHA256:ECDSA+SHA256:RSA+SHA384:ECDSA+SHA384:RSA+SHA1:ECDSA+SHA1
Peer signing digest: SHA384
Server Temp Key: ECDH, P-256, 256 bits
---
SSL handshake has read 1666 bytes and written 138 bytes
---
New, TLSv1/SSLv3, Cipher is ECDHE-RSA-AES128-GCM-SHA256
Server public key is 2048 bit
Secure Renegotiation IS supported
Compression: NONE
Expansion: NONE
No ALPN negotiated
SSL-Session:
    Protocol  : TLSv1.2
    Cipher    : ECDHE-RSA-AES128-GCM-SHA256
    Session-ID:
    Session-ID-ctx:
    Master-Key: 1EFA00A91EE5FC5EDDCFC67C8ECD060D44FD3EB23D834EDED929E4B74536F273C0F9299935E5504B562CD56E76ED208D
    Key-Arg   : None
    Krb5 Principal: None
    PSK identity: None
    PSK identity hint: None
    Start Time: 1529651744
    Timeout   : 300 (sec)
    Verify return code: 21 (unable to verify the first certificate)