cluster-shell-tools

cluster-shells.md

Cluster shelling with pssh or tmux-cssh

## populate hosts files. With IP or hostnames.
tee <<-'EOF' ~/.hosts >/dev/null
ip-10-42-4-10.ec2.internal
ip-10-42-4-30.ec2.internal
ip-10-42-4-31.ec2.internal
ip-10-42-4-32.ec2.internal
ip-10-42-4-33.ec2.internal
ip-10-42-4-50.ec2.internal
EOF

## if required generate SSH key
ssh-keygen -t rsa -b 4096 -o -a 100 -N "" -f ~/.ssh/id_rsa

## Distribute public key to all hosts with only 1 prompt for password:
sudo yum install sshpass
read -p "Enter SSH password:" -s SSHPASS
export SSHPASS
for host in $(<~/.hosts); do
  sshpass -e ssh-copy-id ${host}
done

## Or distribute using an existing working SSH key:
#for host in $(<~/.hosts); do ssh-copy-id -f -i temp.pub ${host}; done

## check if epel is enabled
sudo yum repolist all | grep epel

## if enabled, skip to "install tools"
## if disabled, then enable:
##   sudo yum-config-manager --enable epel
## if not available, install epel
sudo yum install https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm

## install tools
sudo yum install pssh tmux

## install tmux-cssh
mkdir -p ~/bin
curl -L -o ~/bin/tmux-cssh https://raw.githubusercontent.com/seanorama/tmux-cssh/master/tmux-cssh
chmod +x ~/bin/tmux-cssh

## populate host variable. Can pipe within this to choose specific hosts.
hosts=$(<~/.hosts)

## test tmux-cssh
tmux-cssh ${hosts}

## test pssh
pssh -i -H "${hosts}" uptime