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长时间不运行ROS,再次运行roscore报错如下

Unable to contact my own server at [http://ly:46129/].
This usually means that the network is not configured properly.

A common cause is that the machine cannot ping itself.  Please check
for errors by running:

    ping ly

For more tips, please see

    http://www.ros/wiki/ROS/NetworkSetup

The traceback for the exception was written to the log file

解决方法如下:

方法1 连续输入两个命令

 $ export ROS_HOSTNAME=localhost

$ export ROS_MASTER_URI=http://localhost:11311

再次在同一个终端里运行,即可成功。但是重新打开终端还需重新输入。

方法2 

在文件setup.sh中修改,添加上述两项环境变量

sudo vim /opt/ros/kinetic/setup.sh

修改之后source命令使环境变量生效。

$ source /opt/ros/kinetic/setup.sh

本文标签: 报错Contactunableroscorely