saltstack dynamically update etc hosts

[pankaj ghadge]

How to dynamically update /etc/hosts file with saltstack?

There is example that works with ansible great, but don't know how to do it with salt.

http://xmeblog.blogspot.fr/2013/06/ansible-dynamicaly-update-etchosts.html

      - name: add hostname in /etc/hosts
        lineinfile: dest=/etc/hosts regexp='.*{{ item }}$' line="{{ hostvars[item]['ansible_default_ipv4']['address'] }} {{item}}" state=present
        when: hostvars[item]['ansible_default_ipv4']['address'] is defined
        with_items: groups['all']

This will update /etc/hosts with all ansible hosts-ip and host address available in inventory file.

How it is possible with salt? 

I want to collect all minions ip address and hostname and update it on all minions /etc/hosts. 

    minion1 => ip (192.168.1.1) hostname is (example1.net)
    minion2 => ip (192.168.1.2) hostname is (example2.net)
    minion3 => ip (192.168.1.3) hostname is (example3.net)

In all minions /etc/hosts file entry should be like:

    127.0.0.1 localhost
    ::1 localhost
    192.168.1.1  example1.net
    192.168.1.2  example2.net
    192.168.1.3  example3.net

 

Thanks in advance.

[viq]

There appears to be a formula for this:
https://github.com/saltstack-formulas/hostsfile-formula

--
viq

[pankaj ghadge]

But the above mentioned formula is not working for me.

Also I have tried : https://github.com/gtmanfred/salt-states/blob/master/hosts/init.sls

But it also seems not working. 

How do I debug values from it like: 

1) {%- set addrs = salt['mine.get']('*', 'network.ip_addrs') %}  <====== How do I print it to see which values assigned to array addrs

2) {%- set if = grains['maintain_hostsfile_interface'] %}         <====== I don't understand what is this for. How do I print this value.

[Valentin Bud]

Hello Pankaj,

On Mon, Jul 7, 2014 at 3:22 PM, pankaj ghadge <ghadge...@gmail.com> wrote:

But the above mentioned formula is not working for me.

Also I have tried : https://github.com/gtmanfred/salt-states/blob/master/hosts/init.sls

But it also seems not working. 

How do I debug values from it like: 

1) {%- set addrs = salt['mine.get']('*', 'network.ip_addrs') %}  <====== How do I print it to see which values assigned to array addrs

The first thing after a set becomes a Jinja variable. You can print it's contents like:

{{ addrs }}

 

2) {%- set if = grains['maintain_hostsfile_interface'] %}         <====== I don't understand what is this for. How do I print this value.

I think it sets the `if' variable to the value of the `maintain_hostsfile_interface' 

grain from the minion the state runs on.

Who sets that grain? A custom module, a state, manually? Even better do

you have it setup in your infrastructure?

$ sudo salt '*' grains.item maintain_hostsfile_interface

If not, I would start from there and work my way up to the top :).

Best,

Valentin

 

On Thursday, 3 July 2014 20:29:37 UTC+5:30, vic viq wrote:

There appears to be a formula for this:
https://github.com/saltstack-formulas/hostsfile-formula

--
viq

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Valentin Bud

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[pankaj ghadge]

Thanks for the reply, 

{%- set addrs = salt['mine.get']('*', 'network.ip_addrs') %} 

{{ addrs }} 

This does not print anything. 

{%- set if = grains['maintain_hostsfile_interface'] %} 

"if" variable is being set here, then why it is not used?  (https://github.com/saltstack-formulas/hostsfile-formula) 

 

Here i'm trying to print value of usr:

{% for usr in ['moe','larry','curly'] %}

{{ usr }}

{% endfor %}

It gives error like: "ValueError: need more than 1 value to unpack" 

[JC Lawrence]

On 7 Jul 2014, at 06:35, pankaj ghadge <ghadge...@gmail.com> wrote:

Thanks for the reply, 

{%- set addrs = salt['mine.get']('*', 'network.ip_addrs') %} 

{{ addrs }} 

This does not print anything. 

Have you setup the Salt Mine for your network interfaces?

http://docs.saltstack.com/en/latest/topics/mine/

-- JCL

[pankaj ghadge]

Hello Lawrence,

It works like I wanted.

Thank you so very much for responding to my question. You really helped me out a lot.