roscore失败，提示RLException: Unable to contact my own server

在给Jetson Xavior配环境的过程中，发现roscore会报错，报错如下：

robot@robot:~$ roscore
... logging to /home/robot/.ros/log/67bcd434-f455-11eb-b3b6-204ef6c5f181/roslaunch-robot-22150.log
Checking log directory for disk usage. This may take a while.
Press Ctrl-C to interrupt
Done checking log file disk usage. Usage is <1GB.RLException: Unable to contact my own server at [http://192.168.100.3:41153/].
This usually means that the network is not configured properly.A common cause is that the machine cannot connect to itself.  Please check
for errors by running:ping 192.168.100.3For more tips, please seehttp://wiki.ros.org/ROS/NetworkSetupThe traceback for the exception was written to the log file

这是由于在.bashrc里设置了启动ros时的地址和名称，我这里是copy了别人的镜像文件，所以出现了这个问题，他们原来是开机就启动连接一个指定的ip地址。
但在我这里现在不需要这么做，所以要做些修改：
以下是原始的.bashrc启动ros的部分，可见问题是由最后两行引起的

source /opt/ros/melodic/setup.bash
#source /home/robot/hku15_car_ws/devel/setup.bash
export LD_LIBRARY_PATH=/usr/local/cuda/lib
export PATH=$PATH:/usr/local/cuda-10.2/bin
export LD_LIBRARY_PATH=/opt/ros/melodic/lib
export ROS_MASTER_URI=http://192.168.100.3:11311
export ROS_HOSTNAME=192.168.100.3

所以，只要改一下这个地址和用户名就可以了
改成如下：

export ROS_MASTER_URI=http://robot.local:11311
export ROS_HOSTNAME=robot.local

修改后保存，然后在source一次.bashrc就可以了。
然后再次启动roscore，成功

robot@robot:~$ roscore
... logging to /home/robot/.ros/log/a3782aa6-0575-11ec-b3b6-204ef6c5f181/roslaunch-robot-24896.log
Checking log directory for disk usage. This may take a while.
Press Ctrl-C to interrupt
Done checking log file disk usage. Usage is <1GB.started roslaunch server http://robot.local:33981/
ros_comm version 1.14.11SUMMARY
========PARAMETERS* /rosdistro: melodic* /rosversion: 1.14.11NODESauto-starting new master
process[master]: started with pid [24915]
ROS_MASTER_URI=http://robot.local:11311/setting /run_id to a3782aa6-0575-11ec-b3b6-204ef6c5f181
process[rosout-1]: started with pid [24928]
started core service [/rosout]

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