Caused by: com.mysql.cj.core.exceptions.CJCommunicationsException: Communications link failure

微服务服务不能正常启动：
出现一下问题

2019-07-11 14:39:13.452 default [main] ERROR com.zaxxer.hikari.pool.HikariPool.throwPoolInitializationException:574 - HikariPool-1 - Exception during pool initialization.
com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
at com.mysql.cj.jdbc.exceptions.SQLError.createCommunicationsException(SQLError.java:590) ~[mysql-connector-java-6.0.6.jar:6.0.6]
at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:57) ~[mysql-connector-java-6.0.6.jar:6.0.6]
at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:1606) ~[mysql-connector-java-6.0.6.jar:6.0.6]
at com.mysql.cj.jdbc.ConnectionImpl.(ConnectionImpl.java:633) ~[mysql-connector-java-6.0.6.jar:6.0.6]
at com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:347) ~[mysql-connector-java-6.0.6.jar:6.0.6]
at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:219) ~[mysql-connector-java-6.0.6.jar:6.0.6]
at com.zaxxer.hikari.util.DriverDataSource.getConnection(DriverDataSource.java:136) ~[HikariCP-3.2.0.jar:na]
at com.zaxxer.hikari.pool.PoolBase.newConnection(PoolBase.java:369) ~[HikariCP-3.2.0.jar:na]
at com.zaxxer.hikari.pool.PoolBase.newPoolEntry(PoolBase.java:198) ~[HikariCP-3.2.0.jar:na]
at com.zaxxer.hikari.pool.HikariPool.createPoolEntry(HikariPool.java:467) [HikariCP-3.2.0.jar:na]
at com.zaxxer.hikari.pool.HikariPool.checkFailFast(HikariPool.java:541) [HikariCP-3.2.0.jar:na]
at com.zaxxer.hikari.pool.HikariPool.(HikariPool.java:115) [HikariCP-3.2.0.jar:na]
at com.zaxxer.hikari.HikariDataSource.getConnection(HikariDataSource.java:112) [HikariCP-3.2.0.jar:na]
at com.zaxxer.hikari.HikariDataSourceFastClassBySpringCGLIBFastClassBySpringCGLIBFastClassBySpringCGLIBeeb1ae86.invoke() [HikariCP-3.2.0.jar:na]
at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218) [spring-core-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.aop.framework.CglibAopProxyCglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:749)[spring−aop−5.1.4.RELEASE.jar:5.1.4.RELEASE]atorg.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)[spring−aop−5.1.4.RELEASE.jar:5.1.4.RELEASE]atorg.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:136)[spring−aop−5.1.4.RELEASE.jar:5.1.4.RELEASE]atorg.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:124)[spring−aop−5.1.4.RELEASE.jar:5.1.4.RELEASE]atorg.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)[spring−aop−5.1.4.RELEASE.jar:5.1.4.RELEASE]atorg.springframework.aop.framework.CglibAopProxyCglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:749) [spring-aop-5.1.4.RELEASE.jar:5.1.4.RELEASE] at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163) [spring-aop-5.1.4.RELEASE.jar:5.1.4.RELEASE] at org.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:136) [spring-aop-5.1.4.RELEASE.jar:5.1.4.RELEASE] at org.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:124) [spring-aop-5.1.4.RELEASE.jar:5.1.4.RELEASE] at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) [spring-aop-5.1.4.RELEASE.jar:5.1.4.RELEASE] at org.springframework.aop.framework.CglibAopProxyCglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:749)[spring−aop−5.1.4.RELEASE.jar:5.1.4.RELEASE]atorg.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)[spring−aop−5.1.4.RELEASE.jar:5.1.4.RELEASE]atorg.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:136)[spring−aop−5.1.4.RELEASE.jar:5.1.4.RELEASE]atorg.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:124)[spring−aop−5.1.4.RELEASE.jar:5.1.4.RELEASE]atorg.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)[spring−aop−5.1.4.RELEASE.jar:5.1.4.RELEASE]atorg.springframework.aop.framework.CglibAopProxyDynamicAdvisedInterceptor.intercept(CglibAopProxy.java:688) [spring-aop-
at org.springframework.boot.actuate.autoconfigure.health.HealthIndicatorAutoConfiguration.healthIndicatorRegistry(HealthIndicatorAutoConfiguration.java:80) ~[spring-boot-actuator-autoconfigure-2.1.2.RELEASE.jar:2.1.2.RELEASE]
at org.springframework.boot.actuate.autoconfigure.health.HealthIndicatorAutoConfigurationEnhancerBySpringCGLIBEnhancerBySpringCGLIBEnhancerBySpringCGLIBac7bdad3.CGLIB$healthIndicatorRegistry2(&lt;generated&gt;) [spring−boot−actuator−autoconfigure−2.1.2.RELEASE.jar:2.1.2.RELEASE]atorg.springframework.boot.actuate.autoconfigure.health.HealthIndicatorAutoConfiguration2(&lt;generated&gt;) ~[spring-boot-actuator-autoconfigure-2.1.2.RELEASE.jar:2.1.2.RELEASE] at org.springframework.boot.actuate.autoconfigure.health.HealthIndicatorAutoConfiguration2(<generated>) [spring−boot−actuator−autoconfigure−2.1.2.RELEASE.jar:2.1.2.RELEASE]atorg.springframework.boot.actuate.autoconfigure.health.HealthIndicatorAutoConfigurationEnhancerBySpringCGLIBEnhancerBySpringCGLIBEnhancerBySpringCGLIBac7bdad3ac7bdad3ac7bdad3FastClassBySpringCGLIBFastClassBySpringCGLIBFastClassBySpringCGLIB86dae157.invoke(&lt;generated&gt;) [spring−boot−actuator−autoconfigure−2.1.2.RELEASE.jar:2.1.2.RELEASE]atorg.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:244)[spring−core−5.1.4.RELEASE.jar:5.1.4.RELEASE]atorg.springframework.context.annotation.ConfigurationClassEnhancer86dae157.invoke(&lt;generated&gt;) ~[spring-boot-actuator-autoconfigure-2.1.2.RELEASE.jar:2.1.2.RELEASE] at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:244) [spring-core-5.1.4.RELEASE.jar:5.1.4.RELEASE] at org.springframework.context.annotation.ConfigurationClassEnhancer86dae157.invoke(<generated>) [spring−boot−actuator−autoconfigure−2.1.2.RELEASE.jar:2.1.2.RELEASE]atorg.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:244)[spring−core−5.1.4.RELEASE.jar:5.1.4.RELEASE]atorg.springframework.context.annotation.ConfigurationClassEnhancerBeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:363) ~[spring-context-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.boot.actuate.autoconfigure.health.HealthIndicatorAutoConfigurationEnhancerBySpringCGLIBEnhancerBySpringCGLIBEnhancerBySpringCGLIBac7bdad3.healthIndicatorRegistry() ~[spring-boot-actuator-autoconfigure-2.1.2.RELEASE.jar:2.1.2.RELEASE]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_121]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_121]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_121]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_121]
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:622) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:607) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]

at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:142) ~[spring-boot-2.1.2.RELEASE.jar:2.1.2.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:775) ~[spring-boot-2.1.2.RELEASE.jar:2.1.2.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) ~[spring-boot-2.1.2.RELEASE.jar:2.1.2.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:316) ~[spring-boot-2.1.2.RELEASE.jar:2.1.2.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1260) ~[spring-boot-2.1.2.RELEASE.jar:2.1.2.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1248) ~[spring-boot-2.1.2.RELEASE.jar:2.1.2.RELEASE]
at com.ne.ice.ucd.UserCoreDataApplication.main(UserCoreDataApplication.java:23) ~[classes/:na]

Caused by: com.mysql.cj.core.exceptions.CJCommunicationsException: Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:1.8.0_121]
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[na:1.8.0_121]
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:1.8.0_121]
at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[na:1.8.0_121]
at com.mysql.cj.core.exceptions.ExceptionFactory.createException(ExceptionFactory.java:54) ~[mysql-connector-java-6.0.6.jar:6.0.6]
at com.mysql.cj.core.exceptions.ExceptionFactory.createException(ExceptionFactory.java:93) ~[mysql-connector-java-6.0.6.jar:6.0.6]
at com.mysql.cj.core.exceptions.ExceptionFactory.createException(ExceptionFactory.java:133) ~[mysql-connector-java-6.0.6.jar:6.0.6]
at com.mysql.cj.core.exceptions.ExceptionFactory.createCommunicationsException(ExceptionFactory.java:149) ~[mysql-connector-java-6.0.6.jar:6.0.6]
at com.mysql.cj.mysqla.io.MysqlaSocketConnection.connect(MysqlaSocketConnection.java:83) ~[mysql-connector-java-6.0.6.jar:6.0.6]
at com.mysql.cj.mysqla.MysqlaSession.connect(MysqlaSession.java:122) ~[mysql-connector-java-6.0.6.jar:6.0.6]
at com.mysql.cj.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:1726) ~[mysql-connector-java-6.0.6.jar:6.0.6]
at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:1596) ~[mysql-connector-java-6.0.6.jar:6.0.6]
… 192 common frames omitted
Caused by: java.net.UnknownHostException: mysql
at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method) ~[na:1.8.0_121]
at java.net.InetAddress$2.lookupAllHostAddr(InetAddress.java:928) ~[na:1.8.0_121]
at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1323) ~[na:1.8.0_121]
at java.net.InetAddress.getAllByName0(InetAddress.java:1276) ~[na:1.8.0_121]
at java.net.InetAddress.getAllByName(InetAddress.java:1192) ~[na:1.8.0_121]
at java.net.InetAddress.getAllByName(InetAddress.java:1126) ~[na:1.8.0_121]
at com.mysql.cj.core.io.StandardSocketFactory.connect(StandardSocketFactory.java:179) ~[mysql-connector-java-6.0.6.jar:6.0.6]
at com.mysql.cj.mysqla.io.MysqlaSocketConnection.connect(MysqlaSocketConnection.java:57) ~[mysql-connector-java-6.0.6.jar:6.0.6]
… 195 common frames omitted