CODEWITHSUNDEEP
amazon-ec2puppetprovisioning
milestogo
milestogo

Reputation: 1

Puppet - how can I add host entry dynamically reading from linux $hostname

I am using puppet for provisioning to AWS cloud. I am a newbie to this. My requirement is to add entry into /etc/hosts file of amazon ec2 instance. However at the time of writing puppet, I do not know the actual hostname.

How can I use $HOSTNAME variable in .pp file?

Something like this - 

host { '$HOSTNAME':
  ip => 'echo $HOSTNAME | tr "-" "." | sed 's/ip.//'',
  host_aliases => 'mywebsite',
}

Upvotes: 0

Views: 1418

Answers (2)

milestogo
milestogo

Reputation: 1

Since I wanted the hosts file to be updated before startup script's start gets executed, I did this and it worked for me.

Added this in /etc/init.d/

setup_hostname() {
  IPADDR=`echo $HOSTNAME | tr "-" "." | sed 's/ip.//'`
  echo "${IPADDR} ${HOSTNAME}" >> /etc/hosts
}

Called setup_hostname from start 

case "$1" in
  start)
  clean
  setup_hostname
  start
;;

Upvotes: 0

iamauser
iamauser

Reputation: 11469

Something like this :

host { $fqdn : 
  ip => $ipaddress,
  host_aliases => 'mywebsite',
}

$fqdn provides fully qualified domain name and $ipaddress provides IP address for the machine. These variables are available if you have facter installed in your system. facter is available at the puppetlab repo. You can install it the same way you installed puppet in your system.

As in the comment, you can also use $hostname to get the short-hostname in place of $fqdn.

Upvotes: 2

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