Springboot app running on localhost cant communicate with redis running on docker

Question

I have a spring boot app that runs on localhost fine. However, I decided to add caching recently and I run my Redis server from docker. The problem I am facing now is that my Springboot app can not communicate with my Redis running on docker. I get the error as follows:

 2021-08-29 23:51:22.435 ERROR 24319 --- [0.1-8080-exec-4] o.a.c.c.C.[.[.[/].[dispatcherServlet]    : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.springframework.data.redis.RedisConnectionFailureException: Unable to connect to Redis; nested exception is io.lettuce.core.RedisConnectionException: Unable to connect to redis/<unresolved>:6379] with root cause

java.net.UnknownHostException: redis: nodename nor servname provided, or not known
    at java.base/java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method) ~[na:na]
    at java.base/java.net.InetAddress$PlatformNameService.lookupAllHostAddr(InetAddress.java:932) ~[na:na]
    at java.base/java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1517) ~[na:na]
    at java.base/java.net.InetAddress$NameServiceAddresses.get(InetAddress.java:851) ~[na:na]
    at java.base/java.net.InetAddress.getAllByName0(InetAddress.java:1507) ~[na:na]
    at java.base/java.net.InetAddress.getAllByName(InetAddress.java:1366) ~[na:na]
    at java.base/java.net.InetAddress.getAllByName(InetAddress.java:1300) ~[na:na]
    at java.base/java.net.InetAddress.getByName(InetAddress.java:1250) ~[na:na]
    at io.netty.util.internal.SocketUtils$8.run(SocketUtils.java:156) ~[netty-common-4.1.65.Final.jar:4.1.65.Final]
    at io.netty.util.internal.SocketUtils$8.run(SocketUtils.java:153) ~[netty-common-4.1.65.Final.jar:4.1.65.Final]
    at java.base/java.security.AccessController.doPrivileged(AccessController.java:554) ~[na:na]
    at io.netty.util.internal.SocketUtils.addressByName(SocketUtils.java:153) ~[netty-common-4.1.65.Final.jar:4.1.65.Final]
    at io.netty.resolver.DefaultNameResolver.doResolve(DefaultNameResolver.java:41) ~[netty-resolver-4.1.65.Final.jar:4.1.65.Final]
    at io.netty.resolver.SimpleNameResolver.resolve(SimpleNameResolver.java:61) ~[netty-resolver-4.1.65.Final.jar:4.1.65.Final]
    at io.netty.resolver.SimpleNameResolver.resolve(SimpleNameResolver.java:53) ~[netty-resolver-4.1.65.Final.jar:4.1.65.Final]
    at io.netty.resolver.InetSocketAddressResolver.doResolve(InetSocketAddressResolver.java:55) ~[netty-resolver-4.1.65.Final.jar:4.1.65.Final]
    at io.netty.resolver.InetSocketAddressResolver.doResolve(InetSocketAddressResolver.java:31) ~[netty-resolver-4.1.65.Final.jar:4.1.65.Final]
    at io.netty.resolver.AbstractAddressResolver.resolve(AbstractAddressResolver.java:106) ~[netty-resolver-4.1.65.Final.jar:4.1.65.Final]
    at io.netty.bootstrap.Bootstrap.doResolveAndConnect0(Bootstrap.java:206) ~[netty-transport-4.1.65.Final.jar:4.1.65.Final]
    at io.netty.bootstrap.Bootstrap.access$000(Bootstrap.java:46) ~[netty-transport-4.1.65.Final.jar:4.1.65.Final]
    at io.netty.bootstrap.Bootstrap$1.operationComplete(Bootstrap.java:180) ~[netty-transport-4.1.65.Final.jar:4.1.65.Final]
    at io.netty.bootstrap.Bootstrap$1.operationComplete(Bootstrap.java:166) ~[netty-transport-4.1.65.Final.jar:4.1.65.Final]
    at io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:578) ~[netty-common-4.1.65.Final.jar:4.1.65.Final]
    at io.netty.util.concurrent.DefaultPromise.notifyListenersNow(DefaultPromise.java:552) ~[netty-common-4.1.65.Final.jar:4.1.65.Final]
    at io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:491) ~[netty-common-4.1.65.Final.jar:4.1.65.Final]
    at io.netty.util.concurrent.DefaultPromise.setValue0(DefaultPromise.java:616) ~[netty-common-4.1.65.Final.jar:4.1.65.Final]
    at io.netty.util.concurrent.DefaultPromise.setSuccess0(DefaultPromise.java:605) ~[netty-common-4.1.65.Final.jar:4.1.65.Final]
    at io.netty.util.concurrent.DefaultPromise.trySuccess(DefaultPromise.java:104) ~[netty-common-4.1.65.Final.jar:4.1.65.Final]
    at io.netty.channel.DefaultChannelPromise.trySuccess(DefaultChannelPromise.java:84) ~[netty-transport-4.1.65.Final.jar:4.1.65.Final]
    at io.netty.channel.AbstractChannel$AbstractUnsafe.safeSetSuccess(AbstractChannel.java:1012) ~[netty-transport-4.1.65.Final.jar:4.1.65.Final]
    at io.netty.channel.AbstractChannel$AbstractUnsafe.register0(AbstractChannel.java:516) ~[netty-transport-4.1.65.Final.jar:4.1.65.Final]
    at io.netty.channel.AbstractChannel$AbstractUnsafe.access$200(AbstractChannel.java:429) ~[netty-transport-4.1.65.Final.jar:4.1.65.Final]
    at io.netty.channel.AbstractChannel$AbstractUnsafe$1.run(AbstractChannel.java:486) ~[netty-transport-4.1.65.Final.jar:4.1.65.Final]
    at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:164) ~[netty-common-4.1.65.Final.jar:4.1.65.Final]
    at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:472) ~[netty-common-4.1.65.Final.jar:4.1.65.Final]
    at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:500) ~[netty-transport-4.1.65.Final.jar:4.1.65.Final]
    at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989) ~[netty-common-4.1.65.Final.jar:4.1.65.Final]
    at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) ~[netty-common-4.1.65.Final.jar:4.1.65.Final]
    at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) ~[netty-common-4.1.65.Final.jar:4.1.65.Final]
    at java.base/java.lang.Thread.run(Thread.java:832) ~[na:an]

Below is what I have in my application.properties file

server.port=8080
server.address=localhost
management.endpoints.enabled-by-default= false
management.endpoint.health.enabled=true
springdoc.swagger-ui.disable-swagger-default-url=true

spring.cache.type=redis
spring.redis.host=redis
spring.redis.port=6379
spring.cache.redis.cache-null-values=false
spring.cache.redis.time-to-live=60000
spring.cache.redis.use-key-prefix=true
spring.cache.redis.key-prefix=digicore

Can anyone please explain what I might be doing wrong or if I am missing any file or configuration. Is it not possible to run springboot app locally and redis on docker?

How do you test that redis in docker is is available on 6379? — Luke 10X
– Luke 10X, Commented Aug 29, 2021 at 22:58

Jonatan Ivanov · Accepted Answer · 2021-08-29 23:09:30Z

3

It's in the error message: java.net.UnknownHostException: redis

redis is not a known hostname outside of docker, but if you expose port 6379, you can make redis available on localhost: spring.redis.host=localhost

Make sure you map the port 6379 on docker side (-p 6379:6379). You can test it via: telnet localhost 6379.

answered Aug 29, 2021 at 23:09

Jonatan Ivanov

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2 Comments

Noam Yizraeli Over a year ago

he can also use the redis hostname for security and create a docker network that links them so the redis instance isn't exposed to the outside world for no reason

Owolabi Ezekiel Tobiloba Over a year ago

Thank you so much. I cant believe I missed that.

Owolabi Ezekiel Tobiloba · Accepted Answer · 2021-09-02 14:30:58Z

1

Thanks to @Jonatan Ivanov, I made the following changes:

Changed the value of spring.redis.host to localhost instead of redis
Added the binding port to my terminal command so my new command looks like this: docker run --name DigicoreRedis -p 6379:6379 -d redis

answered Sep 2, 2021 at 14:30

Owolabi Ezekiel Tobiloba

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