Rudder

In jinja, access to variable is all doted: {{vars.sys.ipv4.eth0}}

We clarified all this difference in new variable documentation here: https://docs.rudder.io/reference/6.1/usage/variables.html (it's for 6.1, but that part is the same in previous version).

Hope it helps

In jinja, access to variable is all doted: {{vars.sys.ipv4.eth0}}

I tried it but didn't work as expected. The output file is still rendered empty

# rudder agent run -qu
        [...]
E| repaired      fileTemplate              Load Template from a fil| /root/ips.txt    | The copy of the file /var/rudder/configuration-repository/shared-files/ips.tpl from the policy server to /var/rudder/tmp/templates/ips.tpl was repaired
E| repaired      fileTemplate              Expand template           /root/ips.txt    | The expansion of the template /var/rudder/tmp/templates/ips.tpl in /root/ips.txt was repaired
        [...]
# cat /var/rudder/configuration-repository/shared-files/ips.tpl
eth0: {{ vars.sys.ipv4.eth0 }}
eth1: {{ vars.sys.ipv4.eth1 }}
# cat /root/ips.txt
#

The problem is that the system variable is not an array:

      "ipv4": "10.0.2.15",
      "ipv4[enp0s3]": "10.0.2.15",
      "ipv4[enp0s8]": "192.168.41.2",
      "ipv4[lo]": "127.0.0.1",
      "ipv4_1[enp0s3]": "10",
      "ipv4_1[enp0s8]": "192",
      "ipv4_1[lo]": "127",
      "ipv4_2[enp0s3]": "10.0",
      "ipv4_2[enp0s8]": "192.168",
      "ipv4_2[lo]": "127.0",
      "ipv4_3[enp0s3]": "10.0.2",
      "ipv4_3[enp0s8]": "192.168.41",
      "ipv4_3[lo]": "127.0.0",

so we need to access ipv4_3[lo] as key name.

jinja2 has actually two syntaxes for key access : . or [''] (with quotes), so as the variable name contains [] we need to use the second one

{{ vars.sys['ipv4[enp0s3]'] }} should work.

jinja2 has actually two syntaxes for key access : . or [''] (with quotes), so as the variable name contains [] we need to use the second one
{{ vars.sys['ipv4[enp0s3]'] }} should work.

perfect, now it works like a charm. I thank you :)

# rudder agent run -qu
        [...]
E| repaired      fileTemplate              Load Template from a fil| /root/ips.txt    | The copy of the file /var/rudder/configuration-repository/shared-files/ips.tpl from the policy server to /var/rudder/tmp/templates/ips.tpl was repaired
E| repaired      fileTemplate              Expand template           /root/ips.txt    | The expansion of the template /var/rudder/tmp/templates/ips.tpl in /root/ips.txt was repaired
        [...]
# cat /var/rudder/configuration-repository/shared-files/ips.tpl
eth0: {{ vars.sys['ipv4[eth0]'] }}
eth1: {{ vars.sys['ipv4[eth1]'] }}
# cat /root/ips.txt
192.168.1.22
10.0.1.22
#