In Ansible, I have written an Yaml playbook that takes list of host name and the executes command for each host. I have registered a variable for these task and at the end of executing a task I append output of each command to a single file.
But every time I try to append to my output file, only the last record is getting persisted.
---
- hosts: list_of_hosts
become_user: some user
vars:
output: []
tasks:
- name: some name
command: some command
register: output
failed_when: "'FAILED' in output"
- debug: msg="{{output | to_nice_json}}"
- local_action: copy content='{{output | to_nice_json}}' dest="/path/to/my/local/file"
I even tried to append using lineinfile using insertafter parameter yet was not successful.
Anything that I am missing?
You can try something like this:
- name: dummy
hosts: myhosts
serial: 1
tasks:
- name: create file
file:
dest: /tmp/foo
state: touch
delegate_to: localhost
- name: run cmd
shell: echo "{{ inventory_hostname }}"
register: op
- name: append
lineinfile:
dest: /tmp/foo
line: "{{ op }}"
insertafter: EOF
delegate_to: localhost
I have used serial: 1 as I am not sure if lineinfile tasks running in parallel will garble the output file.
Ansible doc recommend use copy:
- name: get jstack
shell: "/usr/lib/jvm/java/bin/jstack -l {{PID_JAVA_APP}}"
args:
executable: /bin/bash
register: jstackOut
- name: write jstack
copy:
content: "{{jstackOut.stdout}}"
dest: "tmp/jstack.txt"
If you want write local file, add this:
delegate_to: localhost
Why to complicate things ?
I did this like that and it worked:
ansible-playbook your_playbook.yml >> /file/you/want/to/redirect/output.txt
you can also try some parsing with grep or some other stuff with tee -a.
Related
I'm running a few tasks in a playbook which runs a bash script and registers its output:
playbook.yml:
- name: Compare FOO to BAZ
shell: . script.sh
register: output
- name: Print the generated output
debug:
msg: "The output is {{ output }}"
- include: Run if BAZ is true
when: output.stdout == "true"
script.sh:
#!/bin/bash
FOO=$(curl example.com/file.txt)
BAR=$(cat file2.txt)
if [ $FOO == $BAR ]; then
export BAZ=true
else
export BAZ=false
fi
What happens is that Ansible registers the output of FOO=$(curl example.com/file.txt) instead of export BAZ.
Is there a way to register BAZ instead of FOO?
I tried running another task that would get the exported value:
- name: Register value of BAZ
shell: echo $BAZ
register: output
But then I realized that every task opens a separate shell on the remote host and doesn't have access to the variables that were exported in previous steps.
Is there any other way to register the right output as a variable?
I've come up with a workaround, but there must be an other way to do this...
I added a line in script.sh and cat the file in a seperate task
script.sh:
...
echo $BAZ > ~/baz.txt
then in the playbook.yml:
- name: Check value of BAZ
shell: cat ~/baz.txt
register: output
This looks a bit like using a hammer to drive a screw... or a screwdriver to plant a nail. Decide if you want to use nails or screws then use the appropriate tool.
Your question misses quite a few details so I hope my answer wont be too far from your requirements. Meanwhile here is an (untested and quite generic) example using ansible to compare your files and run a task based on the result:
- name: compare files and run task (or not...)
hosts: my_group
vars:
reference_url: https://example.com/file.txt
compared_file_path: /path/on/target/to/file2.txt
# Next var will only be defined when the two tasks below have run
file_matches: "{{ reference.content == (compared.content | b64decode) }}"
tasks:
- name: Get reference once for all hosts in play
uri:
url: "{{ reference_url }}"
return_content: true
register: reference
delegate_to: localhost
run_once: true
- name: slurp file to compare from each host in play
slurp:
path: "{{ compared_file_path }}"
register: compared
- name: run a task on each target host if compared is different
debug:
msg: "compared file is different"
when: not file_matches | bool
Just in case you would be doing all this just to check if a file needs to be updated, there's no need to bother: just download the file on the target. It will only be replaced if needed. You can even launch an action at the end of the playbook if (and only if) the file was actually updated on the target server.
- name: Update file from reference if needed
hosts: my_group
vars:
reference_url: https://example.com/file.txt
target_file_path: /path/on/target/to/file2.txt
tasks:
- name: Update file on target if needed and notify handler if changed
get_url:
url: "{{ reference_url }}"
dest: "{{ target_file_path }}"
notify: do_something_if_changed
handlers:
- name: do whatever task is needed if file was updated
debug:
msg: "file was updated: doing some work"
listen: do_something_if_changed
Some references to go further on above concepts:
uri module
get_url module
slurp module
delegating tasks in ansible
registering output of tasks
run_once
handlers
I recently learned that it's not possible to use the wildcard on Ansible. So I would like to know how could I run the next command with a Role.
cat /sys/class/net/*/address | while read mac
I tried to do it so, but it doesn't work.
- name: Cat address file
command: 'cat /sys/class/net/lo/address'
register: my_items
- name: Cat address file 2
command: 'cat /sys/class/net/enp2s0/address'
register: my_items
- name: Cat address file 3
command: 'cat /sys/class/net/wlo1/address'
register: my_items
- name: Read address file
command: read
with_items: my_items.stout_lines
I don't know whats your error but I used this and it works for me:
---
- hosts: dev
become: yes
tasks:
- name: get mac
shell: cat /sys/class/net/*/address
register: items
- name: debug
debug:
msg: "{{items.stdout_lines}}"
Result:
I am trying to use hostname -f command in variable with ansible-playbook. After I set the variable, I will use it in sed command. When manually execute the commands it works but with Ansible, variable does not work.
When I echo $hostn output is empty.
---
- hosts: test
become: true
become_user: root
tasks:
- name: test
shell: "{{ item }}"
with_items:
- hostn=`hostname -f` <<<<<< not working
- echo $hostn <<<<<< not working
- sed -i "s/test/$hostn/g" /file <<<< manually works
Can you help me?
My advise would be that you should not try to fit all your commands in Ansible shell this way, but rather translate them into the corresponding Ansible modules.
What you are looking to achieve can be done with the replace module — in place of sed — and the Ansible fact ansible_hostname — in place of hostname -f.
This would be the equivalent playbook:
- hosts: test
become: true
become_user: root
tasks:
- replace:
path: /file
regexp: test
replace: "{{ ansible_hostname }}"
Ansible version - 2.9
Facing issue in writing output to a csv file, its not writing the output consistently into the file.
Having an inventory file with three server IPs, script will execute command to check the disk space of each server and writing the output to a csv file.
Sometimes its writing all the three server details into the file, sometimes its writing only one or two server details into the file.
- hosts: localhost
connection: local
gather_facts: False
vars:
filext: ".csv"
tasks:
- name: get the username running the deploy
local_action: command whoami
register: username_on_the_host
- name: get current dir
local_action: command pwd
register: current_dir
- name: create dir
file: path={{ current_dir.stdout }}/HCT state=directory
- name: Set file path here
set_fact:
file_path: "{{ current_dir.stdout }}/HCT/HCT_check{{ filext }}"
- name: Creates file
file: path={{ file_path }} state=touch
# Writing to a csv file
- hosts:
- masters
become: false
vars:
disk_space: "Able to get disk space for the CM {{ hostname }} "
disk_space_error: "The server {{ hostname }} is down for some reason. Please check manually."
disk_space_run_status: "{{disk_space}}"
cur_date: "{{ansible_date_time.iso8601}}"
tasks:
- name: runnig command to get file system which are occupied
command: bash -c "df -h | awk '$5>20'"
register: disk_space_output
changed_when: false
ignore_errors: True
no_log: True
- name: Log the task get list of file systems with space occupied
lineinfile:
dest: "{{ hostvars['localhost']['file_path'] }}"
line: "File system occupying disk space, {{ hostname }}, {{ ip_address }}, {{ cur_date }}"
insertafter: EOF
state: present
delegate_to: localhost
Please help to resolve this issue.
The issue is that the task "Log the task get list of file systems with space occupied" is executed in parallel for the 3 servers, so you're having concurrent writing problems.
One solution is to use the serial keyword at play level with a value of 1, this way, all the tasks will be executed for each server one at a time.
- hosts:
- masters
become: false
serial: 1
vars:
[...]
Another solution is to have the task executed for only 1 server but looping over the results of all servers by using hostvars:
- name: Log the task get list of file systems with space occupied
lineinfile:
dest: "{{ hostvars['localhost']['file_path'] }}"
line: "File system occupying disk space, {{ hostvars[item].hostname }}, {{ hostvars[item].ip_address }}, {{ hostvars[item].cur_date }}"
insertafter: EOF
state: present
run_once: True
loop: "{{ ansible_play_hosts }}" # Looping over all hosts of the play
delegate_to: localhost
I have a playbook in the format below:
---
- hosts: myIP
tasks:
- name: Install a yum package in Ansible example
yum:
name: ThePackageIWantToInstall
state: present
where myIP and ThePackageIWantToInstall are variables.
When the job template runs, I would like the user in the extra variables popup to be able to go with:
myIP = 192.168.1.1
ThePackageIWantToInstall = nano
As the documentation doesn't provide an example of supplying a variable via a job template, is this possible?
Yes.
- name: Do The Thing
hosts: "{{ foo }}"
roles:
- "{{ role }}"
Need mustaches and quotes.
to run from popup
(I don't use this, but it was suggested as an edit, thanks...)
foo: value
I have achieved similar thing with add_hosts. Here iam not installing package but creating file with name passed from command line. Any number of hosts (separated by commas can be passed from command line).
# cat addhost2.yml
- hosts: localhost
gather_facts: no
tasks:
- add_host:
name: "{{ item }}"
groups: hosts_from_commandline
with_items: "{{ new_hosts_passed.split(',') }}"
- hosts: hosts_from_commandline
tasks:
- name: Ansible create file with name passed from commandline
file:
path: "/tmp/{{ filename_from_commandline }}"
state: touch
# ansible-playbook -i hosts addhost2.yml --extra-vars='new_hosts_passed=192.168.3.104,192.168.3.113 filename_from_commandline=lathamdkv'
Hope this helps