ngrinder-agent运行脚本时提示NoClassDefF

ngrinder-agent部署到目标机器后，通过sh run_agent.sh启动。

通过ngrinder-controller界面启动测试脚本，查看agent终端，发现运行测试出现一下错误：

Exception in thread "main" java.lang.NoClassDefFoundError: Could not initialize class java.net.InetAddress
        at ch.qos.logback.core.util.ContextUtil.getLocalHostName(ContextUtil.java:32)
        at ch.qos.logback.core.util.ContextUtil.addHostNameAsProperty(ContextUtil.java:41)
        at ch.qos.logback.classic.joran.action.ConfigurationAction.begin(ConfigurationAction.java:48)
        at ch.qos.logback.core.joran.spi.Interpreter.callBeginAction(Interpreter.java:276)
        at ch.qos.logback.core.joran.spi.Interpreter.startElement(Interpreter.java:148)
        at ch.qos.logback.core.joran.spi.Interpreter.startElement(Interpreter.java:130)
        at ch.qos.logback.core.joran.spi.EventPlayer.play(EventPlayer.java:50)
        at ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:147)
        at ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:133)
        at ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:96)
        at ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:55)
        at net.grinder.engine.process.GrinderProcess.configureLogging(GrinderProcess.java:257)
        at net.grinder.engine.process.GrinderProcess.<init>(GrinderProcess.java:141)
        at net.grinder.engine.process.WorkerProcessEntryPoint.run(WorkerProcessEntryPoint.java:78)
        at net.grinder.engine.process.WorkerProcessEntryPoint.main(WorkerProcessEntryPoint.java:60)

解决方法：
在/etc/resolv.conf配置文件中，添加nameserver。

nameserver 192.168.3.1

或为网卡添加DNS配置，重启网络：

systemctl restart network

再次执行run_agent.sh脚本启动测试代理后，可正常运行性能测试脚本。