Thanks Ralf!!! Your question led me to solve this particular issue. When I ran the command you provided I got this:
R --slave --vanilla -e 'cat(R.Version()$major,R.Version()$minor, sep=".")'
ARGUMENT 'sep=".")' __ignored__
Error: unexpected end of input
Execution halted
That told me that these complex arguments were not being passed properly to the R command. Because I am trying to support all of our Linux servers with one shared /usr/local directory, my "/usr/local/bin/R" is a script pointing to /usr/local/src/R-3.4.2/CentOS/bin/R. Where my script passes any supplied command line arguments to the R in the build directory:
I had to change this in my script:
$release/${RPATH[$hostname]}/bin/R $@
to this:
$release/${RPATH[$hostname]}/bin/R "$@"
Now I get the expected results:
R --slave --vanilla -e 'cat(R.Version()$major,R.Version()$minor, sep=".")'
3.4.2
So, this particular issue is solved. When I run the "verify-installation" script, I get no output (which I assume is correct?):
sudo rstudio-server verify-installation
However, I am still not able to access RStudio using the suggested URL. I get a "connection timed out" error.
I am assuming I now need to look at firewall rules.