Ansible generate ssh key if not exists


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Setup SSH Key and initial user using Ansible Playbook











Setup SSH Key and initial user using Ansible Playbook It is sadly proprietary software and the manufacturer has stated they are not changing the behavior to a more sane default. Thankfully you can, using a tool called. Instructions for checking if you have on already and generating a new one if not is located below. Ansible will execute the playbook in sequence and ensure the state of each command is as desired before moving onto the next. One example is docker mounted files, which cannot be updated atomically from inside the container and can only be written in an unsafe manner. It will create an Ansible variable file with password hashes. The below example is for a custom piece of software one of my clients uses.

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Automating Server Setup with Ansible There will be a chaos to maintain the users and specially there ssh keys. By its nature, this user will need to have root privileges, and in our case, that will be achieved via sudo. Apart from that, you will see that our second Droplet has been provisioned, while our first was already running. You can adapt and expand the examples in this tutorial to improve your provisioning scripts custom to your setup. Add the task to the bottom of the file, then save and close the file.

Enable SSH Key based authentication using Ansible Step 4 — Ensuring a Droplet Exists In this step, we will discuss the concept of idempotence and how to relates to provisioning Droplets with Ansible. You may also want to remove the debug line before you rerun your playbook. I’m aware that most major distros have a systemd service that generates ssh host keys. Here is how we can use as a configuration manager, to manage the servers. Handlers Handlers contain logic that should be performed after a module has finished executing and they work very similar to notifications or events. Ed25519 keys have a fixed length and the size will be ignored.

yaml Assuming everything is setup correctly you should receive three success responses. This Ansible playbook example helps you execute actions only if a file exists or does not exist. Create a file right here in the root dir called ansible. This means that the configuration necessary start using Ansible is generally standard for all modules. If you check your DigitalOcean account, you will notice only a single droplet-one Droplet was provisioned. This way you can ssh as root without a password. Give it a filename directories will not work and if it already exists Ansible will skip the action.

Ansible Already you should start to see how much time Ansible can save you, but running single commands on your hosts will only get you so far. This is somewhat problematic for Ansible initially. Using this configuration, users can log in only via ssh-key and those public keys are centrally controlled. I have just begun playing with them myself so I can’t offer much more for you at the moment. This feature will be removed in version 2.

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automating VM generation with user and ssh key for ansible : sysadmin Instead there is a way to let servers access Github on your behalf without creating any extra identities. The same goes for checking if a file does exist and only executing the action if it exists. If you need to generate lots of user accounts with default secure passwords, e. We provide the username, the sudo password and the path to our public key. I use some scripts in there to figure out network settings based on the hostname, another simple but unpopular option is dhcp with static addresses. If you want to delete the two example Droplets you created in this tutorial, just change the state in the creation task to absent and rerun your playbook. One of the main advantages I see in Ansible is the ability to drive your server setup via ssh from your own machine.

6 practices for super smooth Ansible experience by Max Following that, we also need to modify our debug tasks to output the information stored in the variable for each item. If you have ever needed to create multiple users along with their ssh keys what did you do? Thank you for this response. Teach Ansible to talk to Github on your behalf In an effort to keep things simple, I avoid having to create extra ssh keys on my servers and add them to Github. This is what makes Ansible idempotent. The Ansible code does not detect the user exists but the home directory is wrong and just fix the home directory. You should now be able to login using the same command as before, but now you wont be prompted for the password and will automatically be connected.

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ubuntu 14.04 The following variables have to be added to ec2. Installation We need to set up a single control machine which we will use to execute our commands. I resorted to removing the host keys first, as you mention, and the generating new ones. If you’re using some other dynamic inventory approach, you might need to tweak this solution. For example, when the Nginx configurations have changed run service nginx reload. As your number of Droplets you manage increases, the ability to automate the process will save you time in creating, setting up, and destroying Droplets as part of a automated process. The suggests using the mkpasswd command or the Python passlib library for generating the password.

Setup SSH Key and initial user using Ansible Playbook











Setup SSH Key and initial user using Ansible Playbook

It is sadly proprietary software and the manufacturer has stated they are not changing the behavior to a more sane default. Thankfully you can, using a tool called. Instructions for checking if you have on already and generating a new one if not is located below. Ansible will execute the playbook in sequence and ensure the state of each command is as desired before moving onto the next. One example is docker mounted files, which cannot be updated atomically from inside the container and can only be written in an unsafe manner. It will create an Ansible variable file with password hashes. The below example is for a custom piece of software one of my clients uses.

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Automating Server Setup with Ansible

There will be a chaos to maintain the users and specially there ssh keys. By its nature, this user will need to have root privileges, and in our case, that will be achieved via sudo. Apart from that, you will see that our second Droplet has been provisioned, while our first was already running. You can adapt and expand the examples in this tutorial to improve your provisioning scripts custom to your setup. Add the task to the bottom of the file, then save and close the file.

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Enable SSH Key based authentication using Ansible

Step 4 — Ensuring a Droplet Exists In this step, we will discuss the concept of idempotence and how to relates to provisioning Droplets with Ansible. You may also want to remove the debug line before you rerun your playbook. I’m aware that most major distros have a systemd service that generates ssh host keys. Here is how we can use as a configuration manager, to manage the servers. Handlers Handlers contain logic that should be performed after a module has finished executing and they work very similar to notifications or events. Ed25519 keys have a fixed length and the size will be ignored.

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yaml

Assuming everything is setup correctly you should receive three success responses. This Ansible playbook example helps you execute actions only if a file exists or does not exist. Create a file right here in the root dir called ansible. This means that the configuration necessary start using Ansible is generally standard for all modules. If you check your DigitalOcean account, you will notice only a single droplet-one Droplet was provisioned. This way you can ssh as root without a password. Give it a filename directories will not work and if it already exists Ansible will skip the action.

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Ansible

Already you should start to see how much time Ansible can save you, but running single commands on your hosts will only get you so far. This is somewhat problematic for Ansible initially. Using this configuration, users can log in only via ssh-key and those public keys are centrally controlled. I have just begun playing with them myself so I can’t offer much more for you at the moment. This feature will be removed in version 2.

Advertisement

automating VM generation with user and ssh key for ansible : sysadmin

Instead there is a way to let servers access Github on your behalf without creating any extra identities. The same goes for checking if a file does exist and only executing the action if it exists. If you need to generate lots of user accounts with default secure passwords, e. We provide the username, the sudo password and the path to our public key. I use some scripts in there to figure out network settings based on the hostname, another simple but unpopular option is dhcp with static addresses. If you want to delete the two example Droplets you created in this tutorial, just change the state in the creation task to absent and rerun your playbook. One of the main advantages I see in Ansible is the ability to drive your server setup via ssh from your own machine.

Advertisement

6 practices for super smooth Ansible experience by Max

Following that, we also need to modify our debug tasks to output the information stored in the variable for each item. If you have ever needed to create multiple users along with their ssh keys what did you do? Thank you for this response. Teach Ansible to talk to Github on your behalf In an effort to keep things simple, I avoid having to create extra ssh keys on my servers and add them to Github. This is what makes Ansible idempotent. The Ansible code does not detect the user exists but the home directory is wrong and just fix the home directory. You should now be able to login using the same command as before, but now you wont be prompted for the password and will automatically be connected.

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ubuntu 14.04

The following variables have to be added to ec2. Installation We need to set up a single control machine which we will use to execute our commands. I resorted to removing the host keys first, as you mention, and the generating new ones. If you’re using some other dynamic inventory approach, you might need to tweak this solution. For example, when the Nginx configurations have changed run service nginx reload. As your number of Droplets you manage increases, the ability to automate the process will save you time in creating, setting up, and destroying Droplets as part of a automated process. The suggests using the mkpasswd command or the Python passlib library for generating the password.

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