使用springboot2.0链接redis时候，出现以下错误：
org.springframework.data.redis.RedisSystemException: Redis exception; nested exception is io.lettuce.core.RedisException: java.io.IOException: 远程主机强迫关闭了一个现有的连接。
at org.springframework.data.redis.connection.lettuce.LettuceExceptionConverter.convert(LettuceExceptionConverter.java:74) ~[spring-data-redis-2.1.6.RELEASE.jar:2.1.6.RELEASE]
at java.lang.Thread.run(Thread.java:748) ~[na:1.8.0_211]
Caused by: io.lettuce.core.RedisException: java.io.IOException: 远程主机强迫关闭了一个现有的连接。
at io.lettuce.core.LettuceFutures.awaitOrCancel(LettuceFutures.java:129) ~[lettuce-core-5.1.6.RELEASE.jar:na]
at io.lettuce.core.FutureSyncInvocationHandler.handleInvocation(FutureSyncInvocationHandler.java:69) ~[lettuce-core-5.1.6.RELEASE.jar:na]
at io.lettuce.core.internal.AbstractInvocationHandler.invoke(AbstractInvocationHandler.java:80) ~[lettuce-core-5.1.6.RELEASE.jar:na]
at com.sun.proxy.$Proxy144.hset(Unknown Source) ~[na:na]
at org.springframework.data.redis.connection.lettuce.LettuceHashCommands.hSet(LettuceHashCommands.java:69) ~[spring-data-redis-2.1.6.RELEASE.jar:2.1.6.RELEASE]
... 100 common frames omitted
Caused by: java.io.IOException: 远程主机强迫关闭了一个现有的连接。
at sun.nio.ch.SocketDispatcher.read0(Native Method) ~[na:1.8.0_211]
at sun.nio.ch.SocketDispatcher.read(SocketDispatcher.java:43) ~[na:1.8.0_211]
at sun.nio.ch.IOUtil.readIntoNativeBuffer(IOUtil.java:223) ~[na:1.8.0_211]
at sun.nio.ch.IOUtil.read(IOUtil.java:192) ~[na:1.8.0_211]
at sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java:380) ~[na:1.8.0_211]
at io.netty.buffer.PooledUnsafeDirectByteBuf.setBytes(PooledUnsafeDirectByteBuf.java:288) ~[netty-buffer-4.1.34.Final.jar:4.1.34.Final]
at io.netty.buffer.AbstractByteBuf.writeBytes(AbstractByteBuf.java:1125) ~[netty-buffer-4.1.34.Final.jar:4.1.34.Final]
at io.netty.channel.socket.nio.NioSocketChannel.doReadBytes(NioSocketChannel.java:347) ~[netty-transport-4.1.34.Final.jar:4.1.34.Final]
at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:148) ~[netty-transport-4.1.34.Final.jar:4.1.34.Final]
at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:677) ~[netty-transport-4.1.34.Final.jar:4.1.34.Final]
at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:612) ~[netty-transport-4.1.34.Final.jar:4.1.34.Final]
at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:529) ~[netty-transport-4.1.34.Final.jar:4.1.34.Final]
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:491) ~[netty-transport-4.1.34.Final.jar:4.1.34.Final]
at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:905) ~[netty-common-4.1.34.Final.jar:4.1.34.Final]
at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) ~[netty-common-4.1.34.Final.jar:4.1.34.Final]
... 1 common frames omitted
这是需要检查redis的链接配置是否正确：
spring
redis:
host:
port: 6379
password:
database: 1
timeout: 60s
## springboot2.0之后将连接池由jedis改为lettuce
lettuce:
pool:
max-idle: 30
max-active: 8
max-wait: 10000
min-idle: 10
同时在redis的配置文件redis.conf中设置tcp-keepalive时间为60s(据说3.2.1默认为300，我设置60后上述问题不在出现)
完成后重启redis
