How can I get the private IP put into conf file ansible? - ansible

Question

I have this role task file in roles/make_elasticsearch_conf/tasks/main.yml:
---
# tasks file for make_elasticsearch_conf
#
- name: Get private IP address
command:
cmd: "hostname -I | awk '{print $2}'"
register: "cluster_ip"
- name: Create /etc/elasticsearch/elasticsearch.yml File
ansible.builtin.template:
src: elasticsearch.yml.j2
dest: /etc/elasticsearch/elasticsearch.yml
I also have a template in roles/make_elasticsearch_conf/templates/elasticsearch.yml.j2:
cluster.name: {{ ansible_host }}
node.name: {{ ansible_host }}
network.host: {{ cluster_ip }}
I use it in this make_elastic_search_conf.yml playbook:
---
- name: Make Elastic Search Config.
hosts: all
become: True
gather_facts: True
roles:
- roles/make_elasticsearch_conf
When I run my playbook I get this error:
FAILED! => {"changed": true, "cmd": ["hostname", "-I", "|", "awk", "{print $2}"], "delta": "0:00:00.006257", "end": "2022-12-06 21:54:47.612238", "msg": "non-zero return code", "rc": 255, "start": "2022-12-06 21:54:47.605981", "stderr": "Usage: hostname [-b] {hostname|-F file} set host name (from file)\n hostname [-a|-A|-d|-f|-i|-I|-s|-y] display formatted name\n hostname display host name\n\n {yp,nis,}domainname {nisdomain|-F file} set NIS domain name (from file)\n {yp,nis,}domainname display NIS domain name\n\n dnsdomainname display dns domain name\n\n hostname -V|--version|-h|--help print info and exit\n\nProgram name:\n {yp,nis,}domainname=hostname -y\n dnsdomainname=hostname -d\n\nProgram options:\n -a, --alias alias names\n -A, --all-fqdns all long host names (FQDNs)\n -b, --boot set default hostname if none available\n -d, --domain DNS domain name\n -f, --fqdn, --long long host name (FQDN)\n -F, --file read host name or NIS domain name from given file\n -i, --ip-address addresses for the host name\n -I, --all-ip-addresses all addresses for the host\n -s, --short short host name\n -y, --yp, --nis NIS/YP domain name\n\nDescription:\n This command can get or set the host name or the NIS domain name. You can\n also get the DNS domain or the FQDN (fully qualified domain name).\n Unless you are using bind or NIS for host lookups you can change the\n FQDN (Fully Qualified Domain Name) and the DNS domain name (which is\n part of the FQDN) in the /etc/hosts file.", "stderr_lines": ["Usage: hostname [-b] {hostname|-F file} set host name (from file)", " hostname [-a|-A|-d|-f|-i|-I|-s|-y] display formatted name", " hostname display host name", "", " {yp,nis,}domainname {nisdomain|-F file} set NIS domain name (from file)", " {yp,nis,}domainname display NIS domain name", "", " dnsdomainname display dns domain name", "", " hostname -V|--version|-h|--help print info and exit", "", "Program name:", " {yp,nis,}domainname=hostname -y", " dnsdomainname=hostname -d", "", "Program options:", " -a, --alias alias names", " -A, --all-fqdns all long host names (FQDNs)", " -b, --boot set default hostname if none available", " -d, --domain DNS domain name", " -f, --fqdn, --long long host name (FQDN)", " -F, --file read host name or NIS domain name from given file", " -i, --ip-address addresses for the host name", " -I, --all-ip-addresses all addresses for the host", " -s, --short short host name", " -y, --yp, --nis NIS/YP domain name", "", "Description:", " This command can get or set the host name or the NIS domain name. You can", " also get the DNS domain or the FQDN (fully qualified domain name).", " Unless you are using bind or NIS for host lookups you can change the", " FQDN (Fully Qualified Domain Name) and the DNS domain name (which is", " part of the FQDN) in the /etc/hosts file."], "stdout": "", "stdout_lines": []}
I have tried all sorts of ways to get the private ip of the host but nothing I have tried gave the expected result.

Answer 1

The problem is caused by |.
As per the documentation of the command module:
If you want to run a command through the shell (say you are using <,> >, |, and so on), you actually want the ansible.builtin.shell module instead. Parsing shell metacharacters can lead to unexpected commands
being executed if quoting is not done correctly so it is more secure
to use the command module when possible.
You might want to use shell module. Or better get the IP address from the ansible facts.