How to install mosh on an EMR master

Question

I've been having issues with ssh connections terminating, and thought it might be better to install mosh on the emr master - this way there would be some protection from loss of connectivity. I've created the following script to act as part of my bootstrap, but when I run it, I'm having a few issues.

#!/bin/bash

#
# Make sure we've got git, autoconf, automake, protobuf-compilers
#

sudo yum install -y \
    git \
    autoconf-2.69-11.9.amzn1.noarch \
    automake-1.13.4-3.15.amzn1.noarch \
    protobuf-compiler-2.5.0-1.8.amzn1.x86_64 \
    protobuf-2.5.0-1.8.amzn1.x86_64

#
# Pull the latest code from github
#

cd /home/hadoop
git clone https://github.com/keithw/mosh

#
# Build and install
#

cd mosh
./autogen.sh && ./configure && make && sudo make install

Currently this falls over on the configure step with the following:

checking for protobuf... no
configure: error: Package requirements (protobuf) were not met:

No package 'protobuf' found

Consider adjusting the PKG_CONFIG_PATH environment variable if you
installed software in a non-standard prefix.

I've tried setting PREFIX=/usr and PKG_CONFIG_PATH=${PREFIX}/lib64/pkgconfig, then running ./configure with --prefix=$PREFIX - that doesn't help, I've also tried installing the 32 bit package, which also didn't help. This would all be easier if there were a source for sudo yum install -y mosh, however yum whatprovides mosh comes back empty.

Any pointers would be welcome!

Answer 1

It depends on which version of AMI you make an installation. There is a changes you need to make to build it on AMI 3.7.0:

• Do not specify particular version of protobuf package.

  There is protobuf version 2.5.0-1.10 on new AMIs

• Additionally install package protobuf-devel

So your yum install command should look like this:

sudo yum install -y \
  git \
  autoconf-2.69-11.9.amzn1.noarch \
  automake-1.13.4-3.15.amzn1.noarch \
  protobuf-compiler \
  protobuf \
  protobuf-devel

UPD:

Don't forget to modify your ElasticMapReduce-master security group to open UDP port 60001.

• Go to the AWS EC2 WebConsole / Network & Security / Security Groups;
• Pick an ElasticMapReduce-master security group from a list;
• Go to the Inbound tab and and a new rule for UDP port 6001.