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Hi, roscore won't start

asked 2017-07-20 15:14:59 -0600

rg10 gravatar image

updated 2017-08-09 14:58:13 -0600

Roscore (and some launch files) won't start. The command line stays as it is until I hit Ctrl-C.

I read a separate forum that said something could be wrong with etc/hosts , ROS_IP, or ROS_HOSTNAME in the .bashrc. I think this is the case because I needed to edit my .bashrc earlier in order to connect with and control a robot. However, now it seems roscore won't start on the PC.

If you see what the problem is, or have a different idea as to the cause, I would greatly appreciate the help.

Here's my .bashrc:

    enter code here# ~/.bashrc: executed by bash(1) for non-login shells.
# see /usr/share/doc/bash/examples/startup-files (in the package bash-doc)
# for examples

# If not running interactively, don't do anything
case $- in
    *i*) ;;
      *) return;;

# don't put duplicate lines or lines starting with space in the history.
# See bash(1) for more options

# append to the history file, don't overwrite it
shopt -s histappend

# for setting history length see HISTSIZE and HISTFILESIZE in bash(1)

# check the window size after each command and, if necessary,
# update the values of LINES and COLUMNS.
shopt -s checkwinsize

# If set, the pattern "**" used in a pathname expansion context will
# match all files and zero or more directories and subdirectories.
#shopt -s globstar

# make less more friendly for non-text input files, see lesspipe(1)
[ -x /usr/bin/lesspipe ] && eval "$(SHELL=/bin/sh lesspipe)"

# set variable identifying the chroot you work in (used in the prompt below)
if [ -z "${debian_chroot:-}" ] && [ -r /etc/debian_chroot ]; then
    debian_chroot=$(cat /etc/debian_chroot)

# set a fancy prompt (non-color, unless we know we "want" color)
case "$TERM" in
    xterm-color) color_prompt=yes;;

# uncomment for a colored prompt, if the terminal has the capability; turned
# off by default to not distract the user: the focus in a terminal window
# should be on the output of commands, not on the prompt

if [ -n "$force_color_prompt" ]; then
    if [ -x /usr/bin/tput ] && tput setaf 1 >&/dev/null; then
    # We have color support; assume it's compliant with Ecma-48
    # (ISO/IEC-6429). (Lack of such support is extremely rare, and such
    # a case would tend to support setf rather than setaf.)

if [ "$color_prompt" = yes ]; then
    PS1='${debian_chroot:+($debian_chroot)}\[\033[01;32m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w\[\033[00m\]\$ '
    PS1='${debian_chroot:+($debian_chroot)}\u@\h:\w\$ '
unset color_prompt force_color_prompt

# If this is an xterm set the title to user@host:dir
case "$TERM" in
    PS1="\[\e]0;${debian_chroot:+($debian_chroot)}\u@\h: \w\a\]$PS1"

# enable color support of ls and also add handy aliases
if [ -x /usr/bin/dircolors ]; then
    test -r ~/.dircolors && eval "$(dircolors -b ~/.dircolors)" || eval "$(dircolors -b)"
    alias ls='ls --color=auto'
    #alias dir='dir --color=auto'
    #alias vdir='vdir --color=auto'

    alias grep='grep --color=auto'
    alias fgrep='fgrep --color=auto'
    alias egrep='egrep --color=auto'

# some more ...
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Why did you delete the question? Didn't @SL Remy answer it?

gvdhoorn gravatar image gvdhoorn  ( 2017-08-09 15:21:54 -0600 )edit

1 Answer

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answered 2017-07-21 00:19:45 -0600

SL Remy gravatar image

It may be significant that your ros_master_uri is different from your ros_hostname.. the ros_master_uri is saying where the roscore is actually running. So there are couple of questions, are you trying to run roscore remotely? Is your IP address

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You were right, the problem was that my ros_master_uri was different from my ros_hostname. I had switched from using roscore on a separate machine through my computer to on my computer. It's working well now. Thank you!

rg10 gravatar image rg10  ( 2017-08-02 14:02:39 -0600 )edit

@ronangunning100: if you feel @SL Remy's answer has answered your question, could you please tick the checkmark to the left of his answer? That will clearly mark the question as answered.


gvdhoorn gravatar image gvdhoorn  ( 2017-08-02 14:04:22 -0600 )edit

Thanks @gvdhoorn for the reminder

rg10 gravatar image rg10  ( 2017-08-07 15:02:41 -0600 )edit

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Asked: 2017-07-20 15:14:59 -0600

Seen: 840 times

Last updated: Aug 09 '17