【发布时间】：2021-10-22 01:42:53
【问题描述】：
我无法理解问题所在。我在 Spring Boot 2 中的应用程序尝试连接到 Redis，但连接被拒绝。该应用程序作为 Pod 在 Kubernetes 中运行。我不明白为什么在进入运行我的应用程序进程的容器后，我尝试使用 redis-cli 连接到 Redis 并且它可以工作。
看这里：
/opt/transformer # redis-cli -h redis-master-service.default.svc.cluster.local -p 6379 ping
PONG
但我的应用程序在连接到 Redis 时仍然抛出异常。
org.springframework.data.redis.RedisConnectionFailureException: Cannot get Jedis connection; nested exception is redis.clients.jedis.exceptions.JedisConnectionException: Could not get a resource from the pool
at org.springframework.data.redis.connection.jedis.JedisConnectionFactory.fetchJedisConnector(JedisConnectionFactory.java:292) ~[spring-data-redis-2.5.2.jar!/:2.5.2]
at org.springframework.data.redis.connection.jedis.JedisConnectionFactory.getConnection(JedisConnectionFactory.java:511) ~[spring-data-redis-2.5.2.jar!/:2.5.2]
at org.springframework.data.redis.core.RedisConnectionUtils.fetchConnection(RedisConnectionUtils.java:193) ~[spring-data-redis-2.5.2.jar!/:2.5.2]
at org.springframework.data.redis.core.RedisConnectionUtils.doGetConnection(RedisConnectionUtils.java:144) ~[spring-data-redis-2.5.2.jar!/:2.5.2]
at org.springframework.data.redis.core.RedisConnectionUtils.getConnection(RedisConnectionUtils.java:105) ~[spring-data-redis-2.5.2.jar!/:2.5.2]
at org.springframework.data.redis.core.RedisTemplate.execute(RedisTemplate.java:209) ~[spring-data-redis-2.5.2.jar!/:2.5.2]
at org.springframework.data.redis.core.RedisTemplate.execute(RedisTemplate.java:189) ~[spring-data-redis-2.5.2.jar!/:2.5.2]
at org.springframework.data.redis.core.RedisTemplate.execute(RedisTemplate.java:176) ~[spring-data-redis-2.5.2.jar!/:2.5.2]
at org.springframework.data.redis.core.RedisKeyValueAdapter.contains(RedisKeyValueAdapter.java:281) ~[spring-data-redis-2.5.2.jar!/:2.5.2]
at org.springframework.data.keyvalue.core.KeyValueTemplate.lambda$insert$0(KeyValueTemplate.java:176) ~[spring-data-keyvalue-2.5.2.jar!/:2.5.2]
at org.springframework.data.keyvalue.core.KeyValueTemplate.execute(KeyValueTemplate.java:362) ~[spring-data-keyvalue-2.5.2.jar!/:2.5.2]
at org.springframework.data.keyvalue.core.KeyValueTemplate.insert(KeyValueTemplate.java:174) ~[spring-data-keyvalue-2.5.2.jar!/:2.5.2]
at org.springframework.data.redis.core.RedisKeyValueTemplate.insert(RedisKeyValueTemplate.java:158) ~[spring-data-redis-2.5.2.jar!/:2.5.2]
at org.springframework.data.keyvalue.core.KeyValueTemplate.insert(KeyValueTemplate.java:157) ~[spring-data-keyvalue-2.5.2.jar!/:2.5.2]
at org.springframework.data.keyvalue.repository.support.SimpleKeyValueRepository.save(SimpleKeyValueRepository.java:77) ~[spring-data-keyvalue-2.5.2.jar!/:2.5.2]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na]
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
at java.base/java.lang.reflect.Method.invoke(Method.java:566) ~[na:na]
at org.springframework.data.repository.core.support.RepositoryMethodInvoker$RepositoryFragmentMethodInvoker.lambda$new$0(RepositoryMethodInvoker.java:289) ~[spring-data-commons-2.5.2.jar!/:2.5.2]
at org.springframework.data.repository.core.support.RepositoryMethodInvoker.doInvoke(RepositoryMethodInvoker.java:137) ~[spring-data-commons-2.5.2.jar!/:2.5.2]
at org.springframework.data.repository.core.support.RepositoryMethodInvoker.invoke(RepositoryMethodInvoker.java:121) ~[spring-data-commons-2.5.2.jar!/:2.5.2]
at org.springframework.data.repository.core.support.RepositoryComposition$RepositoryFragments.invoke(RepositoryComposition.java:529) ~[spring-data-commons-2.5.2.jar!/:2.5.2]
at org.springframework.data.repository.core.support.RepositoryComposition.invoke(RepositoryComposition.java:285) ~[spring-data-commons-2.5.2.jar!/:2.5.2]
at org.springframework.data.repository.core.support.RepositoryFactorySupport$ImplementationMethodExecutionInterceptor.invoke(RepositoryFactorySupport.java:599) ~[spring-data-commons-2.5.2.jar!/:2.5.2]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.3.8.jar!/:5.3.8]
at org.springframework.data.repository.core.support.QueryExecutorMethodInterceptor.doInvoke(QueryExecutorMethodInterceptor.java:163) ~[spring-data-commons-2.5.2.jar!/:2.5.2]
at org.springframework.data.repository.core.support.QueryExecutorMethodInterceptor.invoke(QueryExecutorMethodInterceptor.java:138) ~[spring-data-commons-2.5.2.jar!/:2.5.2]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.3.8.jar!/:5.3.8]
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:97) ~[spring-aop-5.3.8.jar!/:5.3.8]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.3.8.jar!/:5.3.8]
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:215) ~[spring-aop-5.3.8.jar!/:5.3.8]
at com.sun.proxy.$Proxy58.save(Unknown Source) ~[na:na]
at io.meksula.transformer.config.RequestFilter.doFilter(RequestFilter.java:29) ~[classes!/:0.0.1-SNAPSHOT]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:190) ~[tomcat-embed-core-9.0.48.jar!/:na]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:163) ~[tomcat-embed-core-9.0.48.jar!/:na]
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.3.8.jar!/:5.3.8]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.8.jar!/:5.3.8]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:190) ~[tomcat-embed-core-9.0.48.jar!/:na]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:163) ~[tomcat-embed-core-9.0.48.jar!/:na]
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.3.8.jar!/:5.3.8]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.8.jar!/:5.3.8]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:190) ~[tomcat-embed-core-9.0.48.jar!/:na]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:163) ~[tomcat-embed-core-9.0.48.jar!/:na]
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.3.8.jar!/:5.3.8]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.8.jar!/:5.3.8]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:190) ~[tomcat-embed-core-9.0.48.jar!/:na]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:163) ~[tomcat-embed-core-9.0.48.jar!/:na]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) ~[tomcat-embed-core-9.0.48.jar!/:na]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97) ~[tomcat-embed-core-9.0.48.jar!/:na]
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:542) ~[tomcat-embed-core-9.0.48.jar!/:na]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143) ~[tomcat-embed-core-9.0.48.jar!/:na]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) ~[tomcat-embed-core-9.0.48.jar!/:na]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78) ~[tomcat-embed-core-9.0.48.jar!/:na]
at org.apache.catalina.valves.RemoteIpValve.invoke(RemoteIpValve.java:764) ~[tomcat-embed-core-9.0.48.jar!/:na]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:357) ~[tomcat-embed-core-9.0.48.jar!/:na]
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:382) ~[tomcat-embed-core-9.0.48.jar!/:na]
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) ~[tomcat-embed-core-9.0.48.jar!/:na]
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:893) ~[tomcat-embed-core-9.0.48.jar!/:na]
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1723) ~[tomcat-embed-core-9.0.48.jar!/:na]
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) ~[tomcat-embed-core-9.0.48.jar!/:na]
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) ~[na:na]
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) ~[na:na]
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) ~[tomcat-embed-core-9.0.48.jar!/:na]
at java.base/java.lang.Thread.run(Thread.java:834) ~[na:na]
Caused by: redis.clients.jedis.exceptions.JedisConnectionException: Could not get a resource from the pool
at redis.clients.jedis.util.Pool.getResource(Pool.java:84) ~[jedis-3.6.2.jar!/:na]
at redis.clients.jedis.JedisPool.getResource(JedisPool.java:370) ~[jedis-3.6.2.jar!/:na]
at redis.clients.jedis.JedisPool.getResource(JedisPool.java:15) ~[jedis-3.6.2.jar!/:na]
at org.springframework.data.redis.connection.jedis.JedisConnectionFactory.fetchJedisConnector(JedisConnectionFactory.java:283) ~[spring-data-redis-2.5.2.jar!/:2.5.2]
... 64 common frames omitted
Caused by: redis.clients.jedis.exceptions.JedisConnectionException: Failed to create socket.
at redis.clients.jedis.DefaultJedisSocketFactory.createSocket(DefaultJedisSocketFactory.java:110) ~[jedis-3.6.2.jar!/:na]
at redis.clients.jedis.Connection.connect(Connection.java:226) ~[jedis-3.6.2.jar!/:na]
at redis.clients.jedis.BinaryClient.connect(BinaryClient.java:135) ~[jedis-3.6.2.jar!/:na]
at redis.clients.jedis.BinaryJedis.connect(BinaryJedis.java:309) ~[jedis-3.6.2.jar!/:na]
at redis.clients.jedis.BinaryJedis.initializeFromClientConfig(BinaryJedis.java:87) ~[jedis-3.6.2.jar!/:na]
at redis.clients.jedis.BinaryJedis.<init>(BinaryJedis.java:292) ~[jedis-3.6.2.jar!/:na]
at redis.clients.jedis.Jedis.<init>(Jedis.java:167) ~[jedis-3.6.2.jar!/:na]
at redis.clients.jedis.JedisFactory.makeObject(JedisFactory.java:177) ~[jedis-3.6.2.jar!/:na]
at org.apache.commons.pool2.impl.GenericObjectPool.create(GenericObjectPool.java:918) ~[commons-pool2-2.9.0.jar!/:2.9.0]
at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:431) ~[commons-pool2-2.9.0.jar!/:2.9.0]
at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:356) ~[commons-pool2-2.9.0.jar!/:2.9.0]
at redis.clients.jedis.util.Pool.getResource(Pool.java:75) ~[jedis-3.6.2.jar!/:na]
... 67 common frames omitted
Caused by: java.net.ConnectException: Connection refused (Connection refused)
at java.base/java.net.PlainSocketImpl.socketConnect(Native Method) ~[na:na]
at java.base/java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:399) ~[na:na]
at java.base/java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:242) ~[na:na]
at java.base/java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:224) ~[na:na]
at java.base/java.net.SocksSocketImpl.connect(SocksSocketImpl.java:403) ~[na:na]
at java.base/java.net.Socket.connect(Socket.java:609) ~[na:na]
at redis.clients.jedis.DefaultJedisSocketFactory.createSocket(DefaultJedisSocketFactory.java:80) ~[jedis-3.6.2.jar!/:na]
... 78 common frames omitted
我的应用程序在具有本地 Redis 容器的本地计算机上运行良好。
我不明白为什么 nmap 返回该主机已关闭：
/opt/transformer # nmap redis-master-service.default.svc.cluster.local
Starting Nmap 7.80 ( https://nmap.org ) at 2021-08-20 13:39 UTC
Note: Host seems down. If it is really up, but blocking our ping probes, try -Pn
Nmap done: 1 IP address (0 hosts up) scanned in 3.06 seconds
毕竟，redis-cli 连接正确。为什么会这样？
[编辑]
Redis Pod 定义：
apiVersion: v1
kind: Pod
metadata:
name: redis
labels:
app: redis
spec:
containers:
- name: redis
image: redis:5.0.4
command:
- redis-server
- "/redis-master/redis.conf"
env:
- name: MASTER
value: "true"
ports:
- containerPort: 6379
resources:
limits:
cpu: "0.1"
volumeMounts:
- mountPath: /redis-master-data
name: data
- mountPath: /redis-master
name: config
volumes:
- name: data
emptyDir: {}
- name: config
configMap:
name: redis-config
items:
- key: redis-config
path: redis.conf
Redis 服务定义：
apiVersion: v1
kind: Service
metadata:
name: redis-master-service
labels:
app: redis
spec:
ports:
- port: 6379
targetPort: 6379
selector:
app: redis
Spring Boot 应用程序.yaml：
server:
port: 8080
spring:
rabbitmq:
host: ${MESSAGE_BROKER_HOST}
redis:
host: ${CACHE_HOST}
port: 6379
环境变量在 Spring 应用程序中正确解析，我检查了这一点。
我尝试使用 telnet 连接到服务，并且效果也很好。
/opt/transformer # telnet redis-master-service.default.svc.cluster.local 6379
Connected to redis-master-service.default.svc.cluster.local
【问题讨论】：
-
能否提供指定redis连接的spring boot属性文件？ kubernetes 配置也很有趣，您使用的是服务/副本集/pod 吗？端口配置相关。
-
@usuario 感谢您的回复。我刚刚编辑了我的帖子并添加了一些配置文件。我被卡住了:(
-
恕我直言，我相信环境变量是这里的关键，因为我找不到问题所在。 application.yml 中的
${CACHE_HOST}解析为什么？ Spring Boot 应用程序是在 kubernetes 集群内部还是外部运行？你从哪里执行redis-cli和nmap？ -
redis-cli和nmap我从运行 Java 进程的容器运行。 ${CACHE_HOST} 是来自 ConfigMap 的变量，并正确解析为 redis-master-service.default.svc.cluster.local
标签： java kubernetes redis connection