Something very important to remember is that this file must have permissions 0600 and ownership root:root, or else sssd won’t start! It was also adding the pam and nss mudules. The realm tool also already created an sssd configuration in the following path and nf file. So when I use capital letters for the domain name portion of the username, I was able to join the Ubuntu server to my AD domain from my lab environment as shown below.Īlthough your Kerberos realm can be any ASCII string, convention is to make it the same as your domain name, in upper-case letters.Īfter the join, my Ubuntu server will appear in my lab environements Active Directory. Realm: Couldn’t join realm: Failed to join the domain ! Couldn’t get kerberos ticket for: : KDC reply did not match expectation adcli: couldn’t connect to domain: Couldn’t get kerberos ticket for: : KDC reply did not match expectations ! Failed to join the domain The reason for was as mentioned not using capital letters for the domain portion of the username. So the first try to join the Ubuntu server to my domain failed with the following error messages. In case you renamed it or using another user account which is member of the domain administrators group, you need to use the -U flag and enter the name of the account. You can also leave out the -U flag, in this case it will try to join the domain by using the default Administrator account. The -v flag for verbose will provide you with detailed information about the join or potential errors. The domain name portion from the username must be in capital letters, otherwise you will run into the error shown below. To join the Ubuntu server to my AD domain I will use the following command. sssd can install the missing packages via packagekit, but we installed them already previously. This performs several checks and determines the best software stack to use with sssd. We are using the realm command from the realmd package we previously installed to join the domain and set up the sssd configuration.įirst we will verify if our AD domain is discoverable via DNS. $ sudo apt install sssd-ad sssd-tools realmd adcli Then I will install the following packages we need to set up sssd. I was installing the minimized version, so I will first install some basic networking utilities and the nano editor. To set up sssd I will using the following documentation from Canonical. So for this post and installation I will be using the latest live version as of today is 22.04.1. Unfortunately as far as I can see, the latest version of Ubuntu provided with the legacy image is version 20.04.1 LTS and the link below, I didn’t found any hint on the web if the legacy images will be continued by Canonical. So for my on-premise environment I don’t need this package and I also preferred the legacy installer from Ubuntu. Because cloud-init is called during the initial boot process, there are no additional steps or required agents to apply your configuration. You can use cloud-init to install packages and write files, or to configure users and security. The cloud-init packet can handle and run scripts you attach in the control panel from your hyperscaler provider. This packet is leveraged by hyperscaler like Microsoft Azure, Amazon AWS or Google Cloud to customize a Linux VM. The cloud version (live image) includes for example the cloud-init packet which will get installed by default since version 18.04. The live version is well-adjusted for the cloud. The main differences between these server versions are the preinstalled packets and installation wizard. In past I preferred using for on-premise VMs the alternative or legacy image over the live image. Use remote identities, policies and various authentication and authorization mechanisms to access your computer.įor this post I will set up a new Ubuntu server 22.04.1 server VM in my on-premise lab environment on Hyper-V. Sssd – Open Source Client for Enterprise Identity ManagementĮnroll your Linux machine into an Active Directory, FreeIPA or LDAP domain. The AD provider simplifies the configuration and requires no modifications to the AD structure. Nevertheless for authenticating against a Microsoft Windows AD Domain Controller, it was generally necessary to install the POSIX AD extensions on the Domain Controller. In previous versions of sssd, it was possible to authenticate using the ldap provider. In this post I want to set up the sssd daemon on Ubuntu to join an AD domain and authenticate users against a Active Directory Domain Controller by using the AD provider from sssd.
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