Ansible Error: "[Errno 2] No such file or directory" - kubernetes

Question

I'm not able to execute kubectl(v1.16.3) commands in the ansible command module.
For e.g. Creation of Namespace using ansible.
tasks:
- name: "Creating Directory"
file:
path: ~/ansible_ns/demo_namespaces
state: directory
- name: "Creating Namespaces(1/2)"
copy:
content: "apiVersion: v1 \nkind: Namespace \nmetadata: \n name: {{item}} "
dest: "~/ansible_ns/demo_namespaces/{{item}}.yml"
with_items:
- "{{ namespace }}"
- name: "Creating Namespaces(2/2)"
command: "kubectl create -f {{item}}.yml --kubeconfig=/var/lib/kubernetes/kubeconfig.yaml"
args:
chdir: ~/ansible_ns/demo_namespaces/
ignore_errors: true
with_items:
- "{{ namespace }}"
I'm ending up with the below error:
(item=ns) => {
"ansible_loop_var": "item",
"changed": false,
"cmd": "kubectl create -f ns.yml --kubeconfig=/var/lib/kubernetes/kubeconfig.yaml",
"invocation": {
"module_args": {
"_raw_params": "kubectl create -f ns.yml --kubeconfig=/var/lib/kubernetes/kubeconfig.yaml",
"_uses_shell": false,
"argv": null,
"chdir": "/root/ansible_ns/demo_namespaces/",
"creates": null,
"executable": null,
"removes": null,
"stdin": null,
"stdin_add_newline": true,
"strip_empty_ends": true,
"warn": true
}
},
"item": "ns",
"msg": "[Errno 2] No such file or directory",
"rc": 2
}
NOTE: But I'm able to do "kubectl create -f .." manually..and it is creating the stuff.
My Ansible version:
$ ansible --version
ansible 2.9.2
config file = /etc/ansible/ansible.cfg
configured module search path = [u'/mdupaguntla/.ansible/plugins/modules', u'/usr/share/ansible/plugins/modules']
ansible python module location = /usr/lib/python2.7/site-packages/ansible
executable location = /usr/bin/ansible
python version = 2.7.5 (default, Aug 4 2017, 00:39:18) [GCC 4.8.5 20150623 (Red Hat 4.8.5-16)]
FYI, I also tried with Ansible - 2.4.2 as well. But No luck.
My System OS: CentOS 7
My queries:
What is this error mean "[Errno 2] No such file or directory" in my context?
I came to know that Ansible introduced kubectl & k8s module: Is there anyone in the community using these.. If Yes, please let me know how to use them. If they any prerequisites - please share them
For kubectl Module: Came to know that the pre-requisite is kubectl go library.May I know where can I
get this Library.
when the kubectl version is 1.8 and ansible version is 2.4.2 - I'm able to get the K8s resources created using "kubectl create -f ..." using command module. But when I upgraded my cluster from v1.8 to v1.16.3 - I'm not able to create the resources using "kubectl create -f ..." using command module. Let me if I missed doing things.
Thanks in advance for the Community

Answer 1

You have to add the path for kubectl in the command module.
command: "/the/path/kubectl create -f {{item}}.yml .........."
This is because the $PATH is not updated with the path of kubectl. You can add the path to $PATH also instead of giving the path in command module.

Answer 2

If you use ansible 2.9.2, it has k8s module available. It provides fully declarative approach ( versus issuing imperative commands ) which is more similar to what you can find in kubernetes itself.
For example if you want to create a new namespace, just use:
- name: Create a k8s namespace
k8s:
name: testing
api_version: v1
kind: Namespace
state: present
You have to admit it looks much simpler.

Answer 3

Well, there are two ways to make this process better and functional.
You can try to use k8s module like this way.
- name: Create k8s catota namespace
k8s:
name: catota
api_version: v1
kind: Namespace
state: present
Or you can use the shell module as well:
- name: Create k8s catota namespace
shell: "kubectl create namespace catota"
args:
executable: /bin/bash

Answer 4

Troubleshooting This Issue
The Error:
(item=ns) => {
"ansible_loop_var": "item",
"changed": false,
"cmd": "kubectl create -f ns.yml --kubeconfig=/var/lib/kubernetes/kubeconfig.yaml",
"invocation": {
"module_args": {
"_raw_params": "kubectl create -f ns.yml --kubeconfig=/var/lib/kubernetes/kubeconfig.yaml",
"_uses_shell": false,
"argv": null,
"chdir": "/root/ansible_ns/demo_namespaces/",
"creates": null,
"executable": null,
"removes": null,
"stdin": null,
"stdin_add_newline": true,
"strip_empty_ends": true,
"warn": true
}
},
"item": "ns",
"msg": "[Errno 2] No such file or directory",
"rc": 2
}
First, notice that this states "_uses_shell": false,. This is because it is using Command instead of shell. This is also disguising the error code. If we switch to shell and re-run we get:
"msg": "non-zero return code",
"rc": 127,
"start": "2021-09-03 13:48:12.184639",
"stderr": "/bin/bash: <PROGRAM>: command not found",
(details on exit codes https://www.gnu.org/software/bash/manual/html_node/Exit-Status.html )
The /bin/bash is the giveaway. Doing which kubectl you might get something like /usr/local/bin/kubectl.
You either need to update the ansible command to use /usr/local/bin/kubectl or update the $PATH for /bin/bash/ to find it.