Ansible condition when string not matching - ansible

I am trying to write an Ansible playbook that only compiles Nginx if it's not already present and at the current version. However it compiles every time which is undesirable.
This is what I have:
- shell: /usr/local/nginx/sbin/nginx -v 2>&1
register: nginxVersion
- debug:
var=nginxVersion
- name: install nginx
shell: /var/local/ansible/nginx/makenginx.sh
when: "not nginxVersion == 'nginx version: nginx/1.8.0'"
become: yes
The script all works apart from the fact that it runs the shell script every time to compile Nginx. The debug output for nginxVersion is:
ok: [server] => {
"var": {
"nginxVersion": {
"changed": true,
"cmd": "/usr/local/nginx/sbin/nginx -v 2>&1",
"delta": "0:00:00.003752",
"end": "2015-09-25 16:45:26.500409",
"invocation": {
"module_args": "/usr/local/nginx/sbin/nginx -v 2>&1",
"module_name": "shell"
},
"rc": 0,
"start": "2015-09-25 16:45:26.496657",
"stderr": "",
"stdout": "nginx version: nginx/1.8.0",
"stdout_lines": [
"nginx version: nginx/1.8.0"
],
"warnings": []
}
}
}
According to the documentation I am on the right lines, what simple trick am I missing?

Try:
when: nginxVersion.stdout != 'nginx version: nginx/1.8.0'
or
when: '"nginx version: nginx/1.8.0" not in nginxVersion.stdout'

Since var is a json string you can parse it to json and access it's keys.
set_fact:
var_json: "{{ var.stdout|from_json }}"
Then access the json and get the value you want.
when: var_json.nginxVersion.stdout == 'nginx version: nginx/1.8.0'
checkout this link: https://gist.github.com/justinhennessy/28e82c2ec05f9081786a

Related

How to set shell in module user via registered variable?

To disable logins for root I would like to set its shell to the path of nologin, which is determined by a command.
The command module registers the variable properly:
- name: Get nologin path
command: which nologin
register: nologin
- debug:
var: nologin
Debug info:
ok: [192.168.178.25] => {
"nologin": {
"changed": true,
"cmd": [
"which",
"nologin"
],
"delta": "0:00:00.001612",
"end": "2019-08-26 11:23:41.764847",
"failed": false,
"rc": 0,
"start": "2019-08-26 11:23:41.763235",
"stderr": "",
"stderr_lines": [],
"stdout": "/usr/sbin/nologin",
"stdout_lines": [
"/usr/sbin/nologin"
]
}
}
But when I use the user module it takes the registered variable as a string:
- name: Disable root
user:
name: root
shell: nologin.stdout
state: present
Result in /etc/passwd:
$ cat /etc/passwd
root:x:0:0:root:/root:nologin.stdout
Thanks for any help!
It's a variable, to use it you need to put in jinja2 template {{ }} and inside " " as it is required by YAML:
shell: "{{ nologin.stdout }}"
Ref:
https://docs.ansible.com/ansible/latest/user_guide/playbooks_variables.html#using-variables-with-jinja2
https://docs.ansible.com/ansible/latest/user_guide/playbooks_variables.html#hey-wait-a-yaml-gotcha

how to extract string from ansible regsiter variable in ansible

I have written the following ansible playbook to find the disk failure on the raid
- name: checking raid status
shell: "cat /proc/mdstat | grep nvme"
register: "array_check"
- debug:
msg: "{{ array_check.stdout_lines }}"
Following is the output I got
"msg": [
"md0 : active raid1 nvme0n1p1[0] nvme1n1p1[1]",
"md2 : active raid1 nvme1n1p3[1](F) nvme0n1p3[0]",
"md1 : active raid1 nvme1n1p2[1] nvme0n1p2[0]"
]
I want to extract the disk name which is failed from the register variable array_check.
How do I do this in the ansible? Can I use set_fact module in ansible? Can I use grep, awk, sed command on the register variable array_check
This is the playbook I am using to check the health status of a drive using smartctl
- name: checking the smartctl logs
shell: "smartctl -H /dev/{{ item }}"
with_items:
- nvme0
- nvme1
And I am facing the following error
(item=nvme0) => {"changed": true, "cmd": "smartctl -H /dev/nvme0", "delta": "0:00:00.090760", "end": "2019-09-05 11:21:17.035173", "failed": true, "item": "nvme0", "rc": 127, "start": "2019-09-05 11:21:16.944413", "stderr": "/bin/sh: 1: smartctl: not found", "stdout": "", "stdout_lines": [], "warnings": []}
(item=nvme1) => {"changed": true, "cmd": "smartctl -H /dev/nvme1", "delta": "0:00:00.086596", "end": "2019-09-05 11:21:17.654036", "failed": true, "item": "nvme1", "rc": 127, "start": "2019-09-05 11:21:17.567440", "stderr": "/bin/sh: 1: smartctl: not found", "stdout": "", "stdout_lines": [], "warnings": []}
The desired output should be something like this,
=== START OF SMART DATA SECTION ===
SMART overall-health self-assessment test result: PASSED
Below is the complete playbook including the logic to execute multiple commands in a single task using with_items,
---
- hosts: raid_host
remote_user: ansible
become: yes
become_method: sudo
tasks:
- name: checking raid status
shell: "cat /proc/mdstat | grep 'F' | cut -d' ' -f6 | cut -d'[' -f1"
register: "array_check"
- debug:
msg: "{{ array_check.stdout_lines }}"
- name: checking the samrtctl logs for the drive
shell: "/usr/sbin/smartctl -H /dev/{{ item }} | tail -2|awk -F' ' '{print $6}'"
with_items:
- "nvme0"
- "nvme1"
register: "smartctl_status"

Unable to download golang repository by using ansible

I am trying to download a golang package from github. This is how my playbook looks like
- name: Fetch latest gogs repository
shell: "go get -u github.com/gogits/gogs"
become: true
become_user: git
It is throwing me following error:
{
"changed": true,
"cmd": "go get -u github.com/gogits/gogs",
"delta": "0:00:00.002695",
"end": "2017-08-22 10:50:02.984669",
"failed": true,
"invocation": {
"module_args": {
"_raw_params": "go get -u github.com/gogits/gogs",
"_uses_shell": true,
"chdir": null,
"creates": null,
"executable": null,
"removes": null,
"warn": true
}
},
"rc": 127,
"start": "2017-08-22 10:50:02.981974",
"stderr": "/bin/sh: go: command not found",
"stderr_lines": [
"/bin/sh: go: command not found"
],
"stdout": "",
"stdout_lines": []
}
When I am trying this
- name: Fetch latest gogs repository
shell: "go get -u {{ gogs_repo }}"
environment:
- PATH: $PATH:/usr/local/go/bin:/usr/bin
- GOPATH: "{{gogs_home}}/{{ gogs_project_directory }}/src"
- GOBIN: "{{gogs_home}}/{{ gogs_project_directory }}/bin"
become: true
become_user: git
I got this error
fatal: [atul-ec2]: FAILED! => {
"changed": false,
"failed": true,
"module_stderr": "Shared connection to ec2-13-126-203-235.ap-south-1.compute.amazonaws.com closed.\r\n",
"module_stdout": "Traceback (most recent call last):\r\n File \"/tmp/ansible_gntmXa/ansible_module_command.py\", line 220, in <module>\r\n main()\r\n File \"/tmp/ansible_gntmXa/ansible_module_command.py\", line 163, in main\r\n os.chdir(chdir)\r\nOSError: [Errno 13] Permission denied: '/home/ec2-user/goprojects/src/src/github.com/gogits/gogs'\r\n",
"msg": "MODULE FAILURE",
"rc": 1
}
Here my variables are
---
go_version: go1.7.linux-amd64.tar.gz
go_url: https://storage.googleapis.com/golang/{{ go_version }}
go_hash: sha256:702ad90f705365227e902b42d91dd1a40e48ca7f67a2f4b2fd052aaa4295cd95
go_project_dir: goprojects
go_home: "{{ ansible_env.HOME }}"
gogs_home: "/home/git"
gogs_project_directory: "git.varadev.com"
gogs_repo: github.com/gogits/gogs
But when i am using following command on my server
which go
I got this
/usr/local/go/bin/go
and when I try manually go get -u github.com/gogits/gogs, it is working fine.
Hope this can help you as a start point:
---
- hosts: all
connection: local
tasks:
- name: check go version
command: go version
register: result
changed_when: no
ignore_errors: true
- set_fact:
go_path: "{{ lookup('env', 'GOPATH') | default(ansible_env.HOME+'/go', true) }}"
when: not result|failed
- name: go get gogs
shell: go get -u github.com/gogits/gogs
environment:
GOPATH: "{{ go_path }}"
register: gogs
when: not result|failed
- debug: var=gogs
Try to run this on your remote server by typing:
ansible-playbook gogs.yml -i localhost,
If that works then just later try remotely.
Normally you don't want to do this since you want to execute this remotely over ssh, but since you had tried so far and are getting some errors, probably by trying locally connection: local could help to debug more in details this issue.
I know this post is too old, but maybe this may help someone.
Ths issue /bin/sh: go: command not found it is because you are missing some configuration when Ansible runs, and probably you need to source the bash profile like this:
- name: Install gogs
shell: "source ~/.bash_profile && github.com/gogits/gogs"
args:
chdir: /home/{{ owner }}
become_user: '{{ owner }}'
That worked for me.

How to make changed_when work in Ansible?

I am trying to run a script using the command module on a Jenkins server. The script is written in such a way that it should return 0 if not making any configuration changes and the Ansible task should not be changed.
Here is the code:
- name: Script to run
command: java -jar /var/cache/jenkins/war/WEB-INF/jenkins-cli.jar -s http://localhost:8080 groovy "{{ jenkins_home }}/userContent/script.groovy"
register: return_code
changed_when: return_code.stdout != 0
But the above code behaves is always showing as changed.
The Ansible output:
TASK [jenkins : Script to run] ********************************
changed: [test] => {"changed": true, "cmd": ["java", "-jar", "/var/cache/jenkins/war/WEB-INF/jenkins-cli.jar", "-s", "http://localhost:8080", "groovy", "/var/lib/jenkins/userContent/script.groovy"], "delta": "0:00:01.547098", "end": "2017-02-06 15:31:05.989134", "rc": 0, "start": "2017-02-06 15:31:04.442036", "stderr": "[WARN] Failed to authenticate with your SSH keys. Proceeding as anonymous", "stdout": "0", "stdout_lines": ["0"], "warnings": []}
You need to compare the stdout value with a string instead of an integer:
- name: Script to run
command: java -jar /var/cache/jenkins/war/WEB-INF/jenkins-cli.jar -s http://localhost:8080 groovy "{{ jenkins_home }}/userContent/script.groovy"
register: script_call
changed_when: script_call.stdout != "0"

how to put the result of an echo command into an ansible variable

I have $MY_VAR set to some value on the remote host, and I want to query it from a playbook
(put it's value in an ansible variable), here's what I am seeing :
- name: put shell var into ansible var
command: echo $MY_VAR
register: my_var
- debug: var=my_var
ok: [192.168.78.10] => {
"my_var": {
"changed": true,
"cmd": [
"echo",
"$my_var"
],
"delta": "0:00:00.002284",
"end": "2014-12-17 18:10:01.097217",
"invocation": {
"module_args": "echo $my_var",
"module_name": "command"
},
"rc": 0,
"start": "2014-12-17 18:10:01.094933",
"stderr": "",
"stdout": "$my_var",
"stdout_lines": [
"$my_var"
]
}
}
note:
If I change the command to :
command: pwd
then I get the expected result :
"my_var": {
"stdout": "/home/vagrant",
"stdout_lines": [
"/home/vagrant"
]
}
It seems as if echo does not expand when called from ansible
The problem is that you are using the command module. Here's what the documentation says:
The given command will be executed on all selected nodes. It will not
be processed through the shell, so variables like $HOME and operations
like "<", ">", "|", and "&" will not work (use the shell module if you
need these features).
So, use shell instead of command.
Here's a way to do what you want to do, but without echo. Note you have to use braces to de-reference the variable.
- name: put shell var into ansible var
set_fact:
my_var: "{{ lookup('env','MY_VAR') }}"
- name: print var
debug:
msg: var={{ my_var }}

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