On 1/23/20 12:24 AM, RobertF wrote: > I have an Ansible playbook for provisioning servers. After the server is > provisioned, I want to remove the old FQDN > and/or hostname alias for that server from my local SSH known_hosts file, > pause until the server is up, and then run the > ssh-keyscan command to add the new server's public SSH key to my known_hosts > file. However, my task for running the > keyscan command is resulting in an error that I haven't been able to figure > out.
Hello,
you can not use redirections with the command module. The shell module can do
that. Another alternative would
be to fetch the SSH key file from the server instead of running ssh-keyscan.
Regards
Racke
>
> Here are my tasks:
>
> (tasks that provision server run first here)
>
> - name: remove old server's public key from known_hosts
> known_hosts:
> path: "{{ local_home_dir }}/{{ me }}/.ssh/known_hosts"
> name: "{{ item }}"
> state: absent
> loop:
> - "{{ hostname }}"
> - "{{ hostname }}.{{ domain_name }}"
> become: true
> become_user: "{{ me }}"
>
> - name: pause until host is up
> local_action: command ping -c 1 {{ hostname }}.{{ domain_name }}
> register: result
> until: result.rc == 0
> retries: 30
> delay: 5
>
> - name: add new server's public key to local known_hosts file
> local_action: command ssh-keyscan -t ecdsa {{ hostname }}.{{
> domain_name }} >> {{ local_home_dir }}/{{ me
> }}/.ssh/known_hosts
> become: true
> become_user: "{{ me }}"
>
> The error can be seen here (I abbreviated the key that was returned with ...)
>
> TASK [add new server's public key to local known_hosts file]
> ************************************************************
> task path: /Users/smith/playbooks/gc/test.yml:36
> Using module file
> /Users/smith/.virtualenvs/provision/lib/python3.7/site-packages/ansible/modules/commands/command.py
> Pipelining is enabled.
> <localhost> ESTABLISH LOCAL CONNECTION FOR USER: smith
> <localhost> EXEC /bin/sh -c
> '/Users/smith/.virtualenvs/provision/bin/python && sleep 0'
> changed: [127.0.0.1 -> localhost] => {
> "changed": true,
> "cmd": [
> "ssh-keyscan",
> "-t",
> "ecdsa",
> "example.com",
> ">>",
> "/Users/smith/.ssh/known_hosts"
> ],
> "delta": "0:00:00.241807",
> "end": "2020-01-22 14:50:09.699630",
> "invocation": {
> "module_args": {
> "_raw_params": "ssh-keyscan -t ecdsa example.com >>
> /Users/smith/.ssh/known_hosts",
> "_uses_shell": false,
> "argv": null,
> "chdir": null,
> "creates": null,
> "executable": null,
> "removes": null,
> "stdin": null,
> "stdin_add_newline": true,
> "strip_empty_ends": true,
> "warn": true
> }
> },
> "rc": 0,
> "start": "2020-01-22 14:50:09.457823",
> "stderr": "getaddrinfo >>: nodename nor servname provided, or not
> known\r\ngetaddrinfo
> /Users/smith/.ssh/known_hosts: nodename nor servname provided, or not
> known\r\n# example.com:22 SSH-2.0-OpenSSH_7.9p1
> Debian-10+deb10u1",
> "stderr_lines": [
> "getaddrinfo >>: nodename nor servname provided, or not known",
> "getaddrinfo /Users/smith/.ssh/known_hosts: nodename nor servname
> provided, or not known",
> "# example.com:22 SSH-2.0-OpenSSH_7.9p1 Debian-10+deb10u1"
> ],
> "stdout": "example.com ecdsa-sha2-nistp256 AAAAE2VjZHNhL...",
> "stdout_lines": [
> "example.com ecdsa-sha2-nistp256 AAAAE2VjZHNhL..."
> ]
> }
> META: ran handlers
> META: ran handlers
>
> PLAY RECAP
> **************************************************************************************************************
> 127.0.0.1 : ok=3 changed=1 unreachable=0
> failed=0 skipped=0 rescued=0 ignored=0
>
> I know that the playbook's pause task is working because I can see the server
> come up. I can also run the keyscan
> command that the playbook is running from the command line with no problems.
> It's just the Ansible playbook that gets
> the "nodename nor servname provided, or not known error". What's more
> puzzling is that the stdout lines above show that
> the public key has been fetched from the server. Thanks!
>
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