Here are some errors i ran into while trying to setup Ansible for the second time in my test laboratory. Next, After the krb5 configuration file has been updated correctly, you should be able to successfully authenticate and get a valid token.
As you can see above, the kinit command did not work correctly initially. Other Possible tips to note. Ensure the domain name is in all CAPS, or else you will get an error. I hope you found this blog post helpful. If you have any questions, please let me know in the comment session. Trying to setup Kerberos authentication from ansible linux version 2. Have verified the krb file, try kinit connections all look fine but throwing this kind of error message.
Pls share your thought if your overcome this kind of issues. I am sure this exception is from the client! Ensure the Windows Server is resolvable correctly and if this does not work, please provide me with more information. Check this too. Skip to content Search for: Search Close. Close Menu. Share on Facebook. Follow us. Notify of. Inline Feedbacks. Hi Christian, Trying to setup Kerberos authentication from ansible linux version 2.
Pls share your thought if your overcome this kind of issues Note: Using NTLM protocol connection establishing only issue with Kerberos. Next Entry Error: An Active Directory could not be contacted or cannot find domain because it is nonexistent. Would love your thoughts, please comment.Windows uses this event ID for both successful and failed service ticket requests.
If it is a failure event see Failure Code: below. Whereas event ID lets you track initial logons through the granting of TGTs, this lets you monitor the granting of service tickets.
Service tickets are obtained whenever a user or computer accesses a server on the network. A Kerberos service ticket was requested. This event is generated every time access is requested to a resource such as a computer or a Windows service.
The service name indicates the resource to which access was requested. The logon event occurs on the machine that was accessed, which is often a different machine than the domain controller which issued the service ticket.
Ticket options, encryption types, and failure codes are defined in RFC Top 10 Windows Security Events to Monitor. Free Tool for Windows Event Collection. Supercharger Free Edition Your browser does not support video.
Examples of A Kerberos service ticket was requested. Discussions on Event ID Upcoming Webinars. Additional Resources. Security Log. Event ID Operating Systems. Windows R2 and 7 Windows R2 and 8. Success Failure. Corresponding events in Windows and before. User name:.Managing Windows Servers with Ansible is a powerful way to perform configuration management and to remediate configuration skew in a server environment.
We will look at what components need to be installed in Ubuntu as well as how the configuration for Kerberos is made in Ansible to utilize Active Directory for connecting via WinRM. How do you run this command remotely? There are a couple of ways. Why use Kerberos authentication with Ansible? If you are managing many server resources in a large environment especially, there are certainly advantages to using Kerberos authentication with Windows Server environments as you leverage the central user authentication that Active Directory supplies to configure and manage your Windows Server resources.
There are also trust advantages with WinRM that are built in when using Active Directory credentials. As you will see below, the mechanism to pass the AD credentials with Ansible to the Windows Servers is a bit cumbersome with the kinit command.
However, I still like how the password is handled at this point with a Kerberos ticket instead of a password that is stored or using Ansible vault for YAML files. The following components and order of listing is how I was able to get a successful implementation of Kerberos working in Ubuntu Below is a sample configuration that I have working in my home lab environment for using with Kerberos authentication between my Ansible VM and Windows Server Active Directory.
There area couple of really simple commands that we run on our Ansible box to both get a Kerberos ticket and also list our Kerberos ticket to know we have received one:. You are then prompted to enter a password for the account. In the group variables section of our config for connecting your Ansible control VM to the Windows Servers it is managing, needs to look something like the following:.
The password was already entered to receive the valid Kerberos ticket using the kinit command. Configuring Ansible for use with Kerberos Authentication is the way to go especially in larger Windows Serve r environments where you may have hundreds or thousands of servers. By leveraging Kerberos authentication you can easily authenticate against these domain joined resources.
All in all using Kerberos authentication with a Windows Server environment that is connected to Active Directory is the way to go for ease of use, security, and overall authentication uniformity. Keep up to date with latest posts!To get started, first setup the Kerberos packages in the Tower system so that you can successfully generate a Kerberos ticket. To install the packages, use the following steps:. After the configuration file has been updated, you should be able to successfully authenticate and get a valid token.
The following steps show how to authenticate and get a token:. Once you have a valid ticket, you can check to ensure that everything is working as expected from command line. To test this, make sure that your inventory looks like the following:. You shold also: - Ensure that the hostname is the proper client hostname matching the entry in AD and is not the IP address.
For Tower, you should also ensure that the inventory looks the same. If you encounter a Server not found in Kerberos database error message, and your inventory is configured using FQDNs not IP addressesensure that the service principal name is not missing or mis-configured. Now, running a playbook should run as expected. You can test this by running the playbook as the awx user. Once you have verified that playbooks work properly, integration with Tower is easy.
Generate the Kerberos ticket as the awx user and Tower should automatically pick up the generated ticket for authentication.
The python kerberos package must be installed. Ansible is designed to check if kerberos package is installed and, if so, it uses kerberos authentication. Kerberos needs the ticket created from kinit for authentication. Do not do this as the root user.
Change to the awx user before you perform the kinit. Kerberos tickets are generated every 24 hours, as the default lifetime of a ticket is 24 hours. Another approach is to use cron to kinit the process every 24 hours. To automate this, you must generate a keytab file which stores the user password so that kinit will not prompt for the user password.GitHub is home to over 50 million developers working together to host and review code, manage projects, and build software together.
Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Already on GitHub? Sign in to your account. If these files are inaccurate, please update the component name section of the description or use the! If this is occurring sporadically it sounds like you are talking to different Active Directory hosts and the remove server information has not propagated to that host.
If it cannot find the host it returns the error that you see here. Typically we see this error when someone is trying to connect to a host using it's IP address which results in an SPN that isn't valid. In the case where it sometimes works and sometimes does not then it sounds like a delayed replication issue.
Ultimately it means that the KDC has no knowledge of the host Ansible is trying to connect to and cannot continue the authentication. You even said you have AD replication happening and it takes time so you know what the problem is. The other option is to not use Kerberos but use another auth option like ntlm or credssp but I would only advise using those if you have a https listener set up.
After reading it i think we can close this issue. Skip to content. Dismiss Join GitHub today GitHub is home to over 50 million developers working together to host and review code, manage projects, and build software together. Sign up. New issue. Jump to bottom. Copy link Quote reply. Please add the full playbook and output with -vvv. Please give me some time to provide -vvv output as the error appears very seldom. Sign up for free to subscribe to this conversation on GitHub.
Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I'm now verifying it's functionality against Active Directory and I've hit an issue. I have my server authenticated and listening. I can get the client to login. However, I cannot get the client to get the ticket back from AD to get the session between it and the server. I get KrbException: Server not found in Kerberos database 7and I cannot figure out where the proper place is to add it.
I've tried putting the server name with ip in the hosts file, updating dns, putting in server records, etc, with no luck. If anyone knows where the proper place is to update AD to set a server in the Kerberos Database, that would be great!
This exception comes from the client, right? Please perform a forward and reverse DNS lookup of the server hostname. Your server has incorrect DNS entries. They are absolutely crucial for Kerberos. The proper place is your DNS server, in your case: domain controller.
The other option is a missing SPN, please check that too. I hope this helps. I got this same error message Server not found in Kerberos database 7 but this occurs after the successful use of the keytab to login. This has only started happening since java 1. In our case, I think it is because the LDAP connection is made with the server name found via the round-robin'd resolved query.
That is, java resolves realm. They must have tightened the checking betweeen these releases. In our case the problem was worked around by setting the ldap server name directly rather than relying on DNS.
This is the principal for which the ticket would be obtained. Did you change this to a value relative to your AD domain?
Hostname based SPNs are pre-defined. If you want to use a SPN that is not pre-defined you will have to explicitly define it in AD using the setspn. You can check which account a SPN is associated with by using the command below.
Configure Ansible Windows Server Kerberos authentication in Ubuntu
This will not show pre-defined SPNs. SqlClient not working - Server not found in Kerberos database. Supporting the "RestrictedKrbHost" service class allows client applications to use Kerberos authentication when they do not have the identity of the service but have the server name. This does not provide client-to-service mutual authentication, but rather client-to-server computer authentication. Services of different privilege levels have the same session key and could decrypt each other's data if the underlying service does not ensure that data cannot be accessed by higher services.
COM I got below lines in the terminal:. Also I got two entries of kafka. According to the below link, the principal should contain the Fully Qualified Domain Name FQDN of each host and it should be matched with the principal.
Learn more. Asked 7 years, 7 months ago. Active 1 year, 1 month ago. Viewed 93k times.The following tip explains how user authentication via Active Directory ADalso referred to as authentication through Kerberos, can be done for Ansible Tower.
First, setup the Kerberos packages in the Tower system so that you can successfully generate a Kerberos ticket. To install the packages, use the following steps:. Once the configuration file has been updated, you should be able to successfully authenticate and get a valid token. The following steps show how to authenticate and get a token:.
Once you have a valid ticket, you can check to ensure that everything is working fine from command line. To test this, make sure that your inventory looks like the following:.
Make sure the hostname is the proper client hostname matching the entry in AD and is not the IP address. For Tower, you should also ensure that the inventory looks the same. If you encounter a Server not found in Kerberos database error message, and your inventory is configured using FQDNs not IP addressesensure that the service principal name is not missing or mis-configured.
What we have
Now, if you were to run a playbook, it should run as expected. Test this by running the playbook as the awx user.
Once you have verified that playbooks work as they should, integration with Tower is easy. Generate the Kerberos ticket as the awx user and Tower should automatically pick up the generated ticket for authentication. The python kerberos package must be installed. Ansible is designed to check if kerberos package is installed and, if so, it uses kerberos authentication. A problem you may encounter is that a ticket would be generated every 24 hours as the default life time of a ticket is 24 hours.
Another solution is to use cron to kinit the process every 24 hours. To automate this, you must generate a keytab file which stores the user password so that kinit will not prompt for the user password.
Use the following steps to generate this keytab file and then get the kerberos ticket:. Now, add the following command to cron :. Are you using the latest and greatest version of Ansible Tower?
Find the Ansible Tower documentation set which best matches your version of Tower. Ansible Tower Administration Guide v2.
Tower Licensing, Updates, and Support 1. Support 1. Trial Licenses 1. License Types 1. Node Counting in Licenses 1. License Features 1. Tower Component Licenses 2. Starting, Stopping, and Restarting Tower 3. Custom Inventory Scripts 3.