Fairly new to Ansible.
I have a text file which contains a list of ec2 instance ip addresses. Secondly, I have a .yml file which applies tags to an array of ec2 ips.
Does anyone what run command I would use to pass the list of ips stored as a text file? I did it once a while back before. I forgot the run command, and cannot find it in my history.
I have a text file which contains a list of ec2 instance ip addresses: you probably mean an inventory file.
to include it in your ansible command execution, add -i <file name>
example:
ansible-playbook -i <inventory file> <yml file>
You could create an inventory with your IP's, for example, something like /tmp/my-ec2-vms:
[my-ec2-vms]
10.1.2.10
10.1.2.11
10.1.2.12
10.1.2.13
...
[my-ec2-vms:vars]
ansible_python_interpreter=/usr/local/bin/python
Then for testing, you could use the ping module, for example:
ansible -i /tmp/my-ec2-vms -m ping all
If that works later you could just run your playbooks:
ansible-playbook -i /tmp/my-ec2-vms my-playbook.yml
Related
I would like to run a certain ansible ad-hoc command only on one host from a group of hosts. Say in the hosts file I have a few hosts under group name [webserver], I want to be able to run the command only on one of the hosts in that group, no matter which.
I wasn't able to find an answer for that in ansible ad-hoc doc
You can specify the list of inventory as comma separated values or gorup in command line with ad-hoc command .
ansible-playbook -i emample-host.com, -a <ad hoc command>
Refer Introduction to Ad hoc command
Solution:
Say I have under hosts file
[webserver]
wserver-1
wserver-2
wserver-3
And I want to choose the webserver that comes first (doesn't matter which)
and run some command on it.
The way to do that is as follows:
ansible -i /etc/ansible/hosts webserver[0] -m shell -a 'hostname'
This will run 'hostname' on wserver-1
I am unable to run the example ad hoc command:
ansible -m ping hosts --private-key=~/home/ec2-user/ -u ec2-user
the error is:
[WARNING]: Could not match supplied host pattern, ignoring: hosts
[WARNING]: No hosts matched, nothing to do
The hostname is: ip-10-200-2-21.us-west-2.compute.internal
I can ping the host from my ansible control node by this hostname.
I created the hosts file with the touch command and it looks like this:
ip-10-200-2-21.us-west-2.compute.internal
Do I need to include something more? Do I need to save it with a particular extension? Thank You much for any help.
To run an ad-hoc command you can run a command in the following syntax
ansible <HOST_GROUP> -m <MODULE_NAME>
This is assuming your inventory file is in /etc/ansible/hosts. If your inventory file is located in a different spot we can use the command
ansible <HOST_GROUP> -m <MODULE_NAME> -i <LOCATION_TO_INVENTORY_FILE>
to change the location of the inventory file
Now whats missing is that your inventory file should have a host group in it. Something like:
[ec2]
ip-10-200-2-21.us-west-2.compute.internal
other-ec2-host-that-needs-to-be-pinged.us-west-2.compute.internal
The host group is the text inbetween the square brackets [], which in this case is ec2. Now we can reference all ec2 hosts using the host group of ec2.
To ping all the hosts in the ec2 group (assuming the inventory file is /etc/ansible/hosts) run
ansible ec2 -m ping -i /etc/ansible/hosts
Our vendor sends us Ansible playbooks and scripts for deployment. I need to check availability of some IP for ansible inventory groups, like:
ansible mgm -i inventories/vrxinventory -m shell -a 'ping http://10.33.63.66/vrx/' -u user -k -v.
The destination is changing depending on the environment. Those destination IPs to ping are in group vars .yml file.
Is it possible to use variables from this group_var.yml file, through command line like:
ansible mgm -i inventories/vrxinventory -m shell -a "ping {{ vrm_repo_url }}" -u user -k -v ?
I really don't want to mess with their playbooks modification using sed/awk, during CI.
Is it possible to use variables from this group_var.yml file, through command line like: ansible mgm -i inventories/vrxinventory -m shell -a "ping {{ vrm_repo_url }}" -u user -k -v
Yes, group variables will be read by ansible command for ad-hoc commands.
No, it makes no sense to execute ping {{ vrm_repo_url }} through shell module in Ansible:
firstly, because by default ping runs infinitely (this can be mitigated with parameters);
secondly, because you won't see any output of the ping command.
What you most likely want is to use:
a wait_for module with low connect_timeout parameter to check the connectivity between the target and some other machine;
or a get_url module (as you seemingly want to check availability of web services).
I'm a beginner with Ansible and trying to write a string to a file with an Ad-Hoc command I'm trying to play around with the replace module. The file I'm trying to write to is /etc/motd/.
ansible replace --sudo /etc/motd "This server is managed by Ansible"
Any help would be appreciated thanks!
Have a look at the lineinfile module usage and a general syntax for Ad hoc commands.
What you are looking for is:
ansible target_node -b -m lineinfile -a 'dest=/etc/motd line="This server is managed by Ansible"'
in extended form:
ansible target_node --become --module-name=lineinfile --args='dest=/etc/motd line="This server is managed by Ansible"'
Explanation:
target_node is the hostname or group name as defined in the Ansible inventory file
--become (-b) instructs Ansible to use sudo
-module-name (-m) specifies the module to run (lineinfile here)
--args (-a) passes arguments to the module (these change depending on a module)
dest points to the destination file
line instructs Ansible to ensure a particular line is in the file
If you would like to replace the whole contents of the /etc/motd you should use copy module.
ansible target_node -b -m copy -a 'dest=/etc/motd content="This server is managed by Ansible"'
Notice one of the arguments is changed accordingly.
Is it possible to create multiple host file in Ansible. These files are getting created dynamically.
New host file name is A,B and C
I want to do ssh into a machine which is present is B. How my ansible will understand the host file B for logging into the system.
Maybe you are looking for the -i switch to specify hosts file?
ansible host_name_in_B -i hosts_file_B -m setup