running ssh workflow on group of servers

#generate sample servers

for i in {1..110}; do printf "myserver%05d\n" $i; done > myservers.txt

#group servers by 20
count=0
group=0
for line in $(cat  myservers.txt);
do
  printf "GROUP_%03d %s\n" $group $line
  ((count=$count + 1))
  if [ $count -eq 20 ]; then
    ((group=$group + 1))
    count=0
  fi
done >> grouped.txt

#print servers in given group
cat grouped.txt | grep GROUP_005 | awk -F' ' '{print $2}'


#put this in steps.sh

myserver=$1
step=$2


case $step in
  1)
    echo "hello, this is step 1 for server $myserver"
    ;;
  2)
    echo "ciao, this is step 2 for server $myserver"
    ;;
  3)
    echo "Gruezi, this is step 3 for server $myserver"
    ;;
  *)
    echo "ERROR invalid step $step"
esac

#execute given step for GROUP

THESTEP=3; cat grouped.txt | grep GROUP_005 | awk -vstep="$THESTEP" -F' ' '{print $2,step}' | xargs ./steps.sh

saltstack getting started

curl -L https://bootstrap.saltstack.com -o install_salt.sh

sudo sh install_salt.sh -M #install master and minion on same node

/etc/salt

/etc/salt/minion
master: localhost
id: myminion

sudo systemctl restart salt-minion
sudo systemctl restart salt-master
sudo salt-key
sudo salt-key -a myminion (then type Y)

sudo salt '*' test.ping

sudo salt-call sys.doc test.ping

sudo salt '*' cmd.run_all 'echo HELLO'

#list matcher
sudo salt -L 'myminion' test.ping

sudo salt '*' grains.item os

sudo salt '*' grains.items

sudo salt --grain 'os:CentOS' test.ping

#custom grains
cat /etc/salt/grains

#list all execution modules
sudo salt '*' sys.list_modules

sudo salt '*' pkg.install htop

sudo salt '*' state.sls apache




Ref:

Colton Meyes - Learning Saltstack (Packt Publishing), really direct and hands-on book.

(PS I had a quick look at "Mastering Saltstack" by Packt, it's waaay too abstract and blablaistic.

https://docs.saltstack.com/en/latest/