This document will walk you through installing a full Talos Cluster. If this is your first use of Talos Linux, we recommend the Quickstart first, to quickly create a local virtual cluster on your workstation.
Regardless of where you run Talos, in general you need to:
- acquire the installation image
- decide on the endpoint for Kubernetes
- optionally create a load balancer
- configure Talos
- bootstrap Kubernetes
talosctl is a CLI tool which interfaces with the Talos API in
an easy manner.
talosctl before continuing:
curl -sL https://talos.dev/install | sh
Acquire the installation image
The most general way to install Talos is to use the ISO image (note there are easier methods for some platforms, such as pre-built AMIs for AWS - check the specific Installation Guides.)
The latest ISO image can be found on the Github Releases page:
- X86: https://github.com/siderolabs/talos/releases/download/v1.4.0-alpha.0/talos-amd64.iso
- ARM64: https://github.com/siderolabs/talos/releases/download/v1.4.0-alpha.0/talos-arm64.iso
When booted from the ISO, Talos will run in RAM, and will not install itself until it is provided a configuration. Thus, it is safe to boot the ISO onto any machine.
For network booting and self-built media, you can use the published kernel and initramfs images:
Note that to use alternate booting, there are a number of required kernel parameters. Please see the kernel docs for more information.
Decide the Kubernetes Endpoint
In order to configure Kubernetes, Talos needs to know what the endpoint (DNS name or IP address) of the Kubernetes API Server will be.
The endpoint should be the fully-qualified HTTP(S) URL for the Kubernetes API Server, which (by default) runs on port 6443 using HTTPS.
Thus, the format of the endpoint may be something like:
The Kubernetes API Server endpoint, in order to be highly available, should be configured in a way that functions off all available control plane nodes. There are three common ways to do this:
If you are using a cloud provider or have your own load-balancer (such as HAProxy, nginx reverse proxy, or an F5 load-balancer), using a dedicated load balancer is a natural choice. Create an appropriate frontend matching the endpoint, and point the backends at the addresses of each of the Talos control plane nodes. (Note that given we have not yet created the control plane nodes, the IP addresses of the backends may not be known yet. We can bind the backends to the frontend at a later point.)
Layer 2 Shared IP
Talos has integrated support for serving Kubernetes from a shared/virtual IP address. This method relies on Layer 2 connectivity between control plane Talos nodes.
In this case, we choose an unused IP address on the same subnet as the Talos control plane nodes. For instance, if your control plane node IPs are:
you could choose the ip
192.168.0.15 as your shared IP address.
(Make sure that
192.168.0.15 is not used by any other machine and that your DHCP server
will not serve it to any other machine.)
Once chosen, form the full HTTPS URL from this IP:
If you create a DNS record for this IP, note you will need to use the IP address itself, not the DNS name, to configure the shared IP (
machine.network.interfaces.vip.ip) in the Talos configuration.
For more information about using a shared IP, see the related Guide
You can use DNS records to provide a measure of redundancy. In this case, you would add multiple A or AAAA records (one for each control plane node) to a DNS name.
For instance, you could add:
kube.cluster1.mydomain.com IN A 192.168.0.10 kube.cluster1.mydomain.com IN A 192.168.0.11 kube.cluster1.mydomain.com IN A 192.168.0.12
Then, your endpoint would be:
Decide how to access the Talos API
Many administrative tasks are performed by calling the Talos API on Talos Linux control plane nodes.
We recommend directly accessing the control plane nodes from the
talosctl client, if possible (i.e. set your
endpoints to the IP addresses of the control plane nodes).
This requires your control plane nodes to be reachable from the client IP.
If the control plane nodes are not directly reachable from the workstation where you run
talosctl, then configure a load balancer for TCP port 50000 to be forwarded to the control plane nodes.
Do not use Talos Linux’s built in VIP support for accessing the Talos API, as it will not function in the event of an
etcd failure, and you will not be able to access the Talos API to fix things.
If you create a load balancer to forward the Talos API calls, make a note of the IP or
hostname so that you can configure your
When Talos boots without a configuration, such as when using the Talos ISO, it enters a limited maintenance mode and waits for a configuration to be provided.
In other installation methods, a configuration can be passed in on boot.
For example, Talos can be booted with the
commandline argument set to an HTTP(s) URL from which it should receive its
Where a PXE server is available, this is much more efficient than
manually configuring each node.
If you do use this method, note that Talos requires a number of other
kernel commandline parameters.
See required kernel parameters.
If creating EC2 kubernetes clusters, the configuration file can be passed in as
--user-data to the
aws ec2 run-instances command.
In any case, we need to generate the configuration which is to be provided. We start with generating a secrets bundle which should be saved in a secure location and used to generate machine or client configuration at any time:
talosctl gen secrets -o secrets.yaml
Now, we can generate the machine configuration for each node:
talosctl gen config --with-secrets secrets.yaml <cluster-name> <cluster-endpoint>
cluster-name is an arbitrary name for the cluster, used
in your local client configuration as a label.
It should be unique in the configuration on your local workstation.
cluster-endpoint is the Kubernetes Endpoint you
selected from above.
This is the Kubernetes API URL, and it should be a complete URL, with
(The default port is
6443, but you may have configured your load balancer to forward a different port.)
$ talosctl gen config --with-secrets secrets.yaml my-cluster https://192.168.64.15:6443 generating PKI and tokens created /Users/taloswork/controlplane.yaml created /Users/taloswork/worker.yaml created /Users/taloswork/talosconfig
When you run this command, a number of files are created in your current directory:
.yaml files are Machine Configs.
They provide Talos Linux servers their complete configuration,
describing everything from what disk Talos should be installed on, to network settings.
controlplane.yaml file describes how Talos should form a Kubernetes cluster.
talosconfig file (which is also YAML) is your local client configuration file.
Controlplane and Worker
The two types of Machine Configs correspond to the two roles of Talos nodes, control plane (which run both the Talos and Kubernetes control planes) and worker nodes (which run the workloads).
The main difference between Controlplane Machine Config files and Worker Machine Config files is that the former contains information about how to form the Kubernetes cluster.
Modifying the Machine configs
The generated Machine Configs have defaults that work for many cases.
They use DHCP for interface configuration, and install to
If the defaults work for your installation, you may use them as is.
Sometimes, you will need to modify the generated files so they work with your systems. A common example is needing to change the default installation disk. If you try to to apply the machine config to a node, and get an error like the below, you need to specify a different installation disk:
$ talosctl apply-config --insecure -n 192.168.64.8 --file controlplane.yaml error applying new configuration: rpc error: code = InvalidArgument desc = configuration validation failed: 1 error occurred: * specified install disk does not exist: "/dev/sda"
You can verify which disks your nodes have by using the
talosctl disks --insecure command.
Insecure mode is needed at this point as the PKI infrastructure has not yet been set up.
$ talosctl -n 192.168.64.8 disks --insecure DEV MODEL SERIAL TYPE UUID WWID MODALIAS NAME SIZE BUS_PATH /dev/vda - - HDD - - virtio:d00000002v00001AF4 - 69 GB /pci0000:00/0000:00:06.0/virtio2/
In this case, you would modiy the
worker.yaml and edit the line:
install: disk: /dev/sda # The disk used for installations.
vda instead of
Customizing Machine Configuration
The generated machine configuration provides sane defaults for most cases, but machine configuration can be modified to fit specific needs.
Some machine configuration options are available as flags for the
talosctl gen config command,
for example setting a specific Kubernetes version:
talosctl gen config --with-secrets secrets.yaml --kubernetes-version 1.25.4 my-cluster https://192.168.64.15:6443
Other modifications are done with machine configuration patches.
Machine configuration patches can be applied with
talosctl gen config command:
talosctl gen config --with-secrets secrets.yaml --config-patch-control-plane @cni.patch my-cluster https://192.168.64.15:6443
@cni.patchmeans that the patch is read from a file named
Machine Configs as Templates
Individual machines may need different settings: for instance, each may have a different static IP address.
When different files are needed for machines of the same type, there are two supported flows:
- Use the
talosctl gen configcommand to generate a template, and then patch the template for each machine with
talosctl machineconfig patch.
- Generate each machine configuration file separately with
talosctl gen configwhile applying patches.
For example, given a machine configuration patch which sets the static machine hostname:
# worker1.patch machine: network: hostname: worker1
Either of the following commands will generate a worker machine configuration file with the hostname set to
$ talosctl gen config --with-secrets secrets.yaml my-cluster https://192.168.64.15:6443 created /Users/taloswork/controlplane.yaml created /Users/taloswork/worker.yaml created /Users/taloswork/talosconfig $ talosctl machineconfig patch worker.yaml --patch @worker1.patch --output worker1.yaml
talosctl gen config --with-secrets secrets.yaml --config-patch-worker @worker1.patch --output-types worker -o worker1.yaml my-cluster https://192.168.64.15:6443
To apply the Machine Configs, you need to know the machines’ IP addresses.
Talos will print out the IP addresses of the machines on the console during the boot process:
[4.605369] [talos] task loadConfig (1/1): this machine is reachable at: [4.607358] [talos] task loadConfig (1/1): 192.168.0.2 [4.608766] [talos] task loadConfig (1/1): server certificate fingerprint: [4.611106] [talos] task loadConfig (1/1): xA9a1t2dMxB0NJ0qH1pDzilWbA3+DK/DjVbFaJBYheE= [4.613822] [talos] task loadConfig (1/1): [4.614985] [talos] task loadConfig (1/1): upload configuration using talosctl: [4.616978] [talos] task loadConfig (1/1): talosctl apply-config --insecure --nodes 192.168.0.2 --file <config.yaml> [4.620168] [talos] task loadConfig (1/1): or apply configuration using talosctl interactive installer: [4.623046] [talos] task loadConfig (1/1): talosctl apply-config --insecure --nodes 192.168.0.2 --mode=interactive [4.626365] [talos] task loadConfig (1/1): optionally with node fingerprint check: [4.628692] [talos] task loadConfig (1/1): talosctl apply-config --insecure --nodes 192.168.0.2 --cert-fingerprint 'xA9a1t2dMxB0NJ0qH1pDzilWbA3+DK/DjVbFaJBYheE=' --file <config.yaml>
If you do not have console access, the IP address may also be discoverable from your DHCP server.
Once you have the IP address, you can then apply the correct configuration.
talosctl apply-config --insecure \ --nodes 192.168.0.2 \ --file controlplane.yaml
The insecure flag is necessary because the PKI infrastructure has not yet been made available to the node. Note: the connection will be encrypted, it is just unauthenticated. If you have console access you can extract the server certificate fingerprint and use it for an additional layer of validation:
talosctl apply-config --insecure \ --nodes 192.168.0.2 \ --cert-fingerprint xA9a1t2dMxB0NJ0qH1pDzilWbA3+DK/DjVbFaJBYheE= \ --file cp0.yaml
Using the fingerprint allows you to be sure you are sending the configuration to the correct machine, but it is completely optional. After the configuration is applied to a node, it will reboot. Repeat this process for each of the nodes in your cluster.
Understand talosctl, endpoints and nodes
It is important to understand the concept of
endpoints are the nodes that
talosctl sends commands to, but
nodes are the nodes that the command operates on.
The endpoint will forward the command to the nodes, if needed.
Endpoints are the IP addresses to which the
talosctl client directly talks.
These should be the set of control plane nodes, either directly or through a load balancer.
Each endpoint will automatically proxy requests destined to another node in the cluster. This means that you only need access to the control plane nodes in order to access the rest of the network.
talosctl will automatically load balance requests and fail over between all of your endpoints.
You can pass in
--endpoints <IP Address1>,<IP Address2> as a comma separated list of IP/DNS addresses to the current
You can also set the
endpoints in your
talosconfig, by calling
talosctl config endpoint <IP Address1> <IP Address2>.
Note: these are space separated, not comma separated.
As an example, if the IP addresses of our control plane nodes are:
We would set those in the
talosctl --talosconfig=./talosconfig \ config endpoint 192.168.0.2 192.168.0.3 192.168.0.4
The node is the target you wish to perform the API call on.
When specifying nodes, their IPs and/or hostnames are as seen by the endpoint servers, not as from the client. This is because all connections are proxied through the endpoints.
You may provide
--nodes to any
talosctl command to supply the node or (comma-separated) nodes on which you wish to perform the operation.
For example, to see the containers running on node 192.168.0.200:
talosctl -n 192.168.0.200 containers
To see the etcd logs on both nodes 192.168.0.10 and 192.168.0.11:
talosctl -n 192.168.0.10,192.168.0.11 logs etcd
It is possible to set a default set of nodes in the
talosconfig file, but our recommendation is to explicitly pass in the node or nodes to be operated on with each
For a more in-depth discussion of Endpoints and Nodes, please see talosctl.
Default configuration file
You can reference which configuration file to use directly with the
talosctl --talosconfig=./talosconfig \ --nodes 192.168.0.2 version
talosctl comes with tooling to help you integrate and merge this configuration into the default
talosctl configuration file.
This is done with the
talosctl config merge ./talosconfig
This will merge your new
talosconfig into the default configuration file (
$XDG_CONFIG_HOME/talos/config.yaml), creating it if necessary.
Like Kubernetes, the
talosconfig configuration files has multiple “contexts” which correspond to multiple clusters.
<cluster-name> you chose above will be used as the context name.
Bootstrapping your Kubernetes cluster with Talos is as simple as:
talosctl bootstrap --nodes 192.168.0.2
The bootstrap operation should only be called ONCE and only on a SINGLE control plane node!
The IP can be any of your control planes (or the loadbalancer, if used for the Talos API endpoint).
At this point, Talos will form an
etcd cluster, generate all of the core Kubernetes assets, and start the Kubernetes control plane components.
After a few moments, you will be able to download your Kubernetes client configuration and get started:
Running this command will add (merge) you new cluster into your local Kubernetes configuration.
If you would prefer the configuration to not be merged into your default Kubernetes configuration file, pass in a filename:
talosctl kubeconfig alternative-kubeconfig
You should now be able to connect to Kubernetes and see your nodes:
kubectl get nodes
And use talosctl to explore your cluster:
talosctl -n <NODEIP> dashboard
For a list of all the commands and operations that
talosctl provides, see the CLI reference.