Ssh-rsa preconfiguration for host

gothsome · February 6, 2024, 9:16am

Hello!
im new to AWX.
I have for testing everything in a GitHub Repo.
I have a pretty old Suse server which i just can SSH into if i use -oHostKeyAlgorithms=+ssh-rsa.
I want to import this host with this settings preconfigured, because its the only one.
The yml ChatGPT tried to sell me , doesnt get accepted by AWX:

---
ansible_host: 192.168.150.20
ansible_ssh_common_args: '-oHostKeyAlgorithms=+ssh-rsa'

host_list declined parsing /runner/project/nagios.yml as it did not pass its verify_file() method
script declined parsing /runner/project/nagios.yml as it did not pass its verify_file() method

Thank you in advance for your help!

gothsome · February 7, 2024, 1:09pm

My current yaml after some testing, but still wrong:

- hosts: localhost
  tasks:
    - name: Nagios_3
      add_host:
        name: "192.168.150.20"
        groups: main
        ansible_ssh_common_args: "-o HostKeyAlgorithms=ssh-rsa"

shertel · February 7, 2024, 10:22pm

Chat GPT just regurgitates common patterns, so anything it says has to be fact-checked, making it less efficient than just reading the documentation.

The inventory format is determined by the inventory plugin you want to use.

The intro to inventory contains some examples of YAML inventory files as does the yaml inventory plugin.

For example:

group0:
  hosts:
    host0:
      ansible_host: 192.168.150.20
      ansible_ssh_common_args: '-oHostKeyAlgorithms=+ssh-rsa'

$ ansible-inventory -i inv.yml --list
{
    "_meta": {
        "hostvars": {
            "host0": {
                "ansible_host": "192.168.150.20",
                "ansible_ssh_common_args": "-oHostKeyAlgorithms=+ssh-rsa"
            }
        }
    },
    "all": {
        "children": [
            "ungrouped",
            "group0"
        ]
    },
    "group0": {
        "hosts": [
            "host0"
        ]
    }
}

gothsome · February 8, 2024, 10:42am

Thank you!
I could just for addin inventory find examples for the ssh-rsa in yml in the guide.

gothsome · February 8, 2024, 1:13pm

I cant test tosday - i let my other tickets unattended too long for a while

shertel · February 8, 2024, 1:22pm

No worries. I have a hard time navigating the docs too, but if you google a query like inventory site:docs.ansible.com the intro to inventory will be one of the top results (the first for me).

j-oss2023 · February 11, 2024, 4:29am

There are other options to tackle your issue… depending on your needs / use case

Add custom SSH client config allowing the deprecated algo,

either in ~/.ssh/config (per host / match)

Host 192.168.150.20
   KexAlgorithms +diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1
   Ciphers +aes128-cbc,3des-cbc,aes192-cbc,aes256-cbc
   HostKeyAlgorithms +ssh-rsa
   PubkeyAcceptedAlgorithms +ssh-rsa

For instance, in our environment, it’s likely there are many machines with old ssh server, so rather than specify per host

set globally in /etc/ssh/ssh_config.d/deprecated.conf:

KexAlgorithms +diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1
Ciphers +aes128-cbc,3des-cbc,aes192-cbc,aes256-cbc
HostKeyAlgorithms +ssh-rsa
PubkeyAcceptedKeyTypes +ssh-rsa

The way you’ve chosen to do it is probably best… just sharing other available options…

Also if you are new to AWX, there will be a time (probably soon) where you’ll have to build your own execution environment to handle more specific cases / tasks

for this, you should look at ansible-builder to build a customized container (runner)
There are a million and one ways to configure it, it can be difficult to get started,
I’ve put together a template that can help get you started

https://github.com/j-oss2023/ansible-builder-template

Good luck !

gothsome · February 12, 2024, 8:57am

Hello - i added the host with the ssh rsa options set, but it seems its not used:

gothsome · February 12, 2024, 9:00am

how can i edit the sh config for awx - i dont think its using the settings at the local server, but in the Cubernetes container - i dont know how to get there.

shertel · February 12, 2024, 12:28pm

Should it be something like ansible_ssh_common_args: '-oHostKeyAlgorithms=+ssh-rsa -oPubkeyAcceptedAlgorithms=+ssh-rsa'? If you run a ping test on the CLI with extra verbosity, you can see the ssh command being used to connect ansible -i inv -m ping all -vvv.

gothsome · February 13, 2024, 7:45am

At least it got with the additional ""importet - i can try to remove it and test again.
I used ansible_ssh_common_args: '-oHostKeyAlgorithms=+ssh-rsa -oPubkeyAcceptedAlgorithms=+ssh-rsa' in the yaml and it got like this changed while the import.

gothsome · February 13, 2024, 8:01am

The info was weird, because it was shwn in the json view - when i change to yaml exeryting looks okay.

j-oss2023 · February 13, 2024, 8:11am

@gothsome

If you can’t get that var working build your own custom execution environment,

you are right, it doesnt run SSH from the host, but from a specialized “execution environment” container … by default it uses quay.io/ansible/awx-ee:latest

But you can build your own custom environment, check out my repo i posted earlier …

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Ssh-rsa preconfiguration for host

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