今天小编就为大家带来一篇有关Kubernetes 证书的介绍和使用的文章。小编觉得挺实用的，为此分享给大家做个参考。一起跟随小编过来看看吧。各节点访问之间使用证书验证可靠性
work node ——> load banlancer ——>api server ——>etcd<——etcd
worknode 访问load banlancer 需要验证证书的有限性 所以需要同一个ca根证书,同理其他也是 etcd 由于需要互访所以是双向证书
1，使用CFSSL签发生成证书

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curl -s -L -o /bin/cfssl https://pkg.cfssl.org/R1.2/cfssl_linux-amd64
curl -s -L -o /bin/cfssljson https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64
curl -s -L -o /bin/cfssl-certinfo https://pkg.cfssl.org/R1.2/cfssl-certinfo_linux-amd64
chmod +x /bin/cfssl*

容器相关证书类型

client certificate： 用于服务端认证客户端,例如etcdctl、etcd proxy、fleetctl、docker客户端
server certificate: 服务端使用，客户端以此验证服务端身份,例如docker服务端、kube-apiserver
peer certificate: 双向证书，用于etcd集群成员间通信

创建生成CA根证书

##生成默认CA配置
mkdir /opt/ssl
cd /opt/ssl
cfssl print-defaults config > ca-config.json
cfssl print-defaults csr > ca-csr.json
##################
##修改ca-config.json,分别配置针对三种不同证书类型的profile,其中有效期43800h为5年
{
"signing": {
   "default": {
     "expiry": "43800h"
   },
   "profiles": {
     "server": {
       "expiry": "43800h",
       "usages": [
         "signing",
         "key encipherment",
         "server auth"
       ]
     },
     "client": {
       "expiry": "43800h",
       "usages": [
         "signing",
         "key encipherment",
         "client auth"
       ]
     },
     "peer": {
       "expiry": "43800h",
       "usages": [
         "signing",
         "key encipherment",
         "server auth",
         "client auth"
       ]
     }
   }
}
}
##字段说明
##ca-config.json：可以定义多个 profiles，分别指定不同的过期时间、使用场景等参数；后续在签名证书时使用某个 profile；
##signing：表示该证书可用于签名其它证书；生成的 ca.pem 证书中 CA:TRUE；
##server auth：表示client可以用该 CA 对server提供的证书进行验证；
##client auth：表示server可以用该CA对client提供的证书进行验证；

修改ca-csr.json

{
"CN": "Self Signed Ca",
"key": {
   "algo": "rsa",
   "size": 2048
},
"names": [
   {
     "C": "CN",
     "L": "SH",
     "O": "Netease",
     "ST": "SH",       
     "OU": "OT"
   }   ]
}
#####
##字段说明
“CN”：Common Name，kube-apiserver 从证书中提取该字段作为请求的用户名 (User Name)；
“O”：Organization，kube-apiserver 从证书中提取该字段作为请求用户所属的组 (Group)；
“C”: Country， 国家
“L”: Locality，地区，城市
“O”: Organization Name，组织名称，公司名称
“OU”: Organization Unit Name，组织单位名称，公司部门
“ST”: State，州，省

生成CA证书和私钥

cfssl gencert -initca ca-csr.json | cfssljson -bare ca
##生成ca.pem、ca.csr、ca-key.pem(CA私钥,需妥善保管)

签发Server Certificate，client Certificate,peer Certificate,注其中的hosts 地址 和cn名称 ，其他正文格式都是一样

cfssl print-defaults csr > server.json
vim server.json
{
   "CN": "Server",
   "hosts": [
     "192.168.1.1"
    ],
   "key": {
     "algo": "rsa",
     "size": 2048
   },
   "names": [
     {
       "C": "CN",
       "L": "SH",
       "ST": "SH"
     }
   ]
}

##生成服务端证书和私钥
cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=server server.json | cfssljson -bare server

验证证书

openssl x509 -in server.pem -text -noout
Certificate:
   Data:
     Version: 3 (0x2)
     Serial Number:
       6f:25:cf:8d:42:1e:c8:2d:b8:78:95:d1:f4:0a:25:8e:bb:48:53:9d
   Signature Algorithm: sha256WithRSAEncryption
     Issuer: C=CN, ST=San Francisco, L=Chongqing, CN=test
     Validity
       Not Before: Feb 13 11:35:00 2019 GMT
       Not After : Feb 13 11:35:00 2020 GMT
     Subject: C=US, ST=San Francisco, L=CA, CN=etcd
     Subject Public Key Info:
       Public Key Algorithm: rsaEncryption
         Public-Key: (2048 bit)
         Modulus:
           00:b6:79:4d:af:27:a0:c9:0e:8a:d0:8c:25:d4:12:
           f7:22:21:45:ce:80:25:e5:c6:0b:47:fe:ba:79:c7:
           aa:14:d6:51:be:45:2d:92:49:a5:07:37:36:66:9b:
           38:a9:9c:9c:0b:cf:91:45:55:7a:20:43:ad:64:09:
           31:bb:25:30:ba:50:20:fe:3b:4e:cf:8c:21:bc:43:
           d8:cf:f4:1b:d6:ed:3b:3e:9d:53:74:89:db:17:4b:
           a7:a2:01:bb:00:36:74:95:a7:cf:0a:24:a1:0d:62:
           6d:47:d3:f4:3a:93:e4:15:df:20:af:59:fb:5f:77:
           9b:76:45:ad:68:24:69:d3:1a:cf:75:ef:3f:6d:19:
           d6:3c:54:76:ec:1b:a3:98:bf:e3:d6:d7:a5:f8:ec:
           12:47:ee:06:ab:ae:31:8b:83:be:43:6e:b9:41:2d:
           82:ff:c6:20:e6:2c:69:d5:81:d4:9a:07:b2:e4:9a:
           40:af:e9:ed:98:4e:c0:27:ef:7c:14:86:cf:6e:6e:
           18:98:1c:d1:d9:dd:4e:a3:10:d3:63:f9:00:d6:3b:
           04:e9:47:54:af:87:db:83:d5:8a:8a:05:f4:e8:38:
           4d:64:e7:ae:b4:5f:3f:6a:18:c8:87:32:7d:24:46:
           72:a8:4a:7f:dd:5c:5b:cf:6a:2f:af:88:bb:b2:d8:
           02:af
         Exponent: 65537 (0x10001)
     X509v3 extensions:
       X509v3 Key Usage: critical
         Digital Signature, Key Encipherment
       X509v3 Extended Key Usage: 
         TLS Web Server Authentication
       X509v3 Basic Constraints: critical
         CA:FALSE
       X509v3 Subject Key Identifier: 
         B7:EF:2C:02:18:05:D0:7E:30:63:BB:F9:8F:52:B4:1E:1F:57:4A:C8
       X509v3 Authority Key Identifier: 
         keyid:3C:58:00:7D:E0:2B:C1:AE:81:88:58:F1:FB:95:45:88:33:28:F7:00

       X509v3 Subject Alternative Name: 
         IP Address:172.19.0.203, IP Address:172.19.0.204, IP Address:172.19.0.205
   Signature Algorithm: sha256WithRSAEncryption
     35:8f:af:a7:03:c3:8f:5e:42:ec:10:af:33:c8:4e:b1:0e:d5:
     f7:3e:b2:5f:5d:cf:b4:49:15:94:b1:6b:78:3a:b5:fb:95:68:
     ab:ff:ff:45:74:f9:5f:17:a7:be:16:c8:92:66:28:d0:7c:6d:
     60:0d:82:26:65:01:71:f1:93:0d:0b:44:f3:08:59:9e:d5:89:
     d5:8c:83:d1:dc:b2:a5:8f:b6:be:e8:9e:79:3c:62:02:6b:0e:
     b0:1e:82:b6:2c:4c:b0:f8:eb:93:20:84:8c:c6:32:69:b3:88:
     27:bb:e8:7f:1c:37:01:26:35:0b:9a:61:bf:cc:00:c7:17:80:
     61:11:cb:b7:4d:66:85:e6:13:3e:8c:8e:be:ec:47:d1:00:85:
     cb:b1:aa:69:6a:49:35:44:43:d9:cf:67:fd:ec:63:50:96:4a:
     26:5b:36:c8:72:15:d7:5f:49:e5:30:98:0e:13:58:70:d2:72:
     03:02:45:c1:9c:81:dc:e0:e1:1c:f0:a4:e3:13:e1:b8:d4:01:
     f7:83:d6:cf:72:ba:46:aa:84:55:57:64:e6:93:bb:bc:68:55:
     32:cd:a4:d1:d6:db:e7:e6:9f:4f:1e:8a:24:44:76:42:ec:9d:
     4e:d2:5a:7f:74:7b:9a:66:ed:c3:1d:e4:5d:1a:07:ed:c6:fe:
     bf:8e:d2:80

表示服务器证书

表示客户端证书

表示双向证书

表示CA证书

看完上述内容，你们对Kubernetes 证书的介绍和使用大概了解了吗？如果想了解更多相关文章内容，欢迎关注创新互联行业资讯频道，感谢各位的阅读！

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