This guide walks through a bare-metal installation of Tectonic utilizing PXE-based tools. This document will cover:
|1. Overview||Review types of machines in the cluster
Review networking requirements
|2. Provisioning Infrastructure||Download and install bootcfg
Generate TLS assets
|3. Configure Networking||Set up DHCP, TFTP, and DNS services
Configure DNS for the cluster
|4. Tectonic Installer||Install Kubernetes and Tectonic|
|5. Tectonic Console||You're done! Your cluster is ready!|
A minimum of 3 machines are required to run Tectonic.
A provisioner node runs the bootcfg network boot and provisioning service, along with PXE services if you don't already run them elsewhere. You may use CoreOS or any Linux distribution for this node. It provisions nodes, but does not join Tectonic clusters.
A Tectonic cluster consists of two types of nodes:
Controller nodes run
etcd and the control plane of the cluster.
Worker nodes run your applications. New worker nodes will join the cluster by talking to controller nodes for admission.
This guide requires familiarity with PXE booting, the ability to configure network services, and to add DNS names. These are discussed in detail below.
bootcfg is a service for network booting and provisioning bare-metal nodes into CoreOS clusters.
bootcfg should be installed on a provisioner node to serve configs during boot.
The commands to set up
bootcfg should be performed on the provisioner node.
Download the latest Tectonic release to the provisioner node and extract it.
wget https://releases.tectonic.com/releases/tectonic_1.5.2-tectonic.1.tar.gz tar xzvf tectonic-1.5.2-tectonic.1.tar.gz cd tectonic/coreos-baremetal
bootcfg on the provisioner node.
On an RPM-based provisioner, install the
bootcfg RPM from the Copr repository using
dnf copr enable dghubble/bootcfg dnf install bootcfg # requires yum-plugin-copr yum copr enable dghubble/bootcfg yum install bootcfg
On a CoreOS provisioner, rkt run
bootcfg image with the provided systemd unit.
$ sudo cp contrib/systemd/bootcfg-for-tectonic.service /etc/systemd/system/bootcfg.service
Pre-built binaries are available for general Linux distributions. Copy the
bootcfg static binary to an appropriate location on the provisioner node.
$ cd tectonic/coreos-baremetal $ sudo cp bootcfg /usr/local/bin
bootcfg service should be run by a non-root user with access to the
bootcfg data directory (
/var/lib/bootcfg). Create a
bootcfg user and group.
$ sudo useradd -U bootcfg $ sudo mkdir -p /var/lib/bootcfg/assets $ sudo chown -R bootcfg:bootcfg /var/lib/bootcfg
Copy the provided
bootcfg systemd unit file.
$ sudo cp contrib/systemd/bootcfg.service /etc/systemd/system/
bootcfg by editing the systemd unit or adding a systemd dropin. Find the complete set of
bootcfg flags and environment variables at config.
sudo systemctl edit bootcfg
By default, the read-only HTTP machine endpoint will be exposed on port 8080. Enable the gRPC API to allow clients with a TLS client certificate to change machine configs. The Tectonic Installer uses this API.
# /etc/systemd/system/bootcfg.service.d/override.conf [Service] Environment="BOOTCFG_ADDRESS=0.0.0.0:8080" Environment="BOOTCFG_RPC_ADDRESS=0.0.0.0:8081" Environment="BOOTCFG_LOG_LEVEL=debug"
bootcfg to suit your preferences.
Allow your port choices on the provisioner's firewall so the clients can access the service. Here are the commands for those using
$ sudo firewall-cmd --zone=MYZONE --add-port=8080/tcp --permanent $ sudo firewall-cmd --zone=MYZONE --add-port=8081/tcp --permanent
bootcfg API allows client apps such as the Tectonic Installer to manage how machines are provisioned. TLS credentials are needed for client authentication and to establish a secure communication channel.
If your organization manages public key infrastructure and a certificate authority, create a server certificate and key for the
bootcfg service and a client certificate and key.
Otherwise, generate a self-signed
ca.crt, a server certificate (
server.key), and client credentials (
client.key) with the
scripts/tls/cert-gen script. Export the DNS name or IP (discouraged) of the provisioner node.
$ cd scripts/tls # DNS or IP Subject Alt Names where bootcfg can be reached $ export SAN=DNS.1:bootcfg.example.com,IP.1:192.168.1.42 $ ./cert-gen
Place the TLS credentials in the default location:
$ sudo mkdir -p /etc/bootcfg $ sudo cp ca.crt server.crt server.key /etc/bootcfg/
ca.crt will be used by the Tectonic Installer later.
bootcfg service and enable it if you'd like it to start on every boot.
$ sudo systemctl daemon-reload $ sudo systemctl start bootcfg $ sudo systemctl enable bootcfg
Verify the bootcfg service is running and can be reached by nodes (those being provisioned). It is recommended that you define a DNS name for this purpose (see Networking).
$ systemctl status bootcfg $ dig bootcfg.example.com
Verify you receive a response from the HTTP and API endpoints.
$ curl http://bootcfg.example.com:8080 bootcfg $ cd tectonic/coreos-baremetal $ openssl s_client -connect bootcfg.example.com:8081 -CAfile /etc/bootcfg/ca.crt -cert scripts/tls/client.crt -key scripts/tls/client.key CONNECTED(00000003) depth=1 CN = fake-ca verify return:1 depth=0 CN = fake-server verify return:1 --- Certificate chain 0 s:/CN=fake-server i:/CN=fake-ca --- ....
bootcfg can serve CoreOS images to reduce bandwidth usage and increase the speed of CoreOS PXE boots and installs to disk. Tectonic Installer will use this feature.
Download a recent CoreOS stable release with signatures.
$ ./scripts/get-coreos stable 1235.6.0 . # note the "." 3rd argument
Move the images to
$ sudo cp -r coreos /var/lib/bootcfg/assets
$ tree /var/lib/bootcfg/assets /var/lib/bootcfg/assets/ ├── coreos │ └── 1235.6.0 │ ├── CoreOS_Image_Signing_Key.asc │ ├── coreos_production_image.bin.bz2 │ ├── coreos_production_image.bin.bz2.sig │ ├── coreos_production_pxe_image.cpio.gz │ ├── coreos_production_pxe_image.cpio.gz.sig │ ├── coreos_production_pxe.vmlinuz │ └── coreos_production_pxe.vmlinuz.sig
and verify the images are acessible.
$ curl http://bootcfg.example.com:8080/assets/coreos/SOME-VERSION/ <pre>...
A bare-metal Tectonic cluster requires PXE infrastructure, which we'll setup next.
Set up DHCP, TFTP, and DNS services with your network administrator. Review network setup to find the right approach for your PXE environment. At a high level, your goals are to:
bootcfgiPXE HTTP endpoint (e.g.
CoreOS provides a dnsmasq container, if you wish to use rkt or Docker.
The Tectonic Installer will prompt for "Controller" and "Tectonic" DNS names. For the controller DNS name, add a record which resolves to the node you plan to use as a controller.
By default, Tectonic Ingress runs as a Kubernetes Daemon Set across workers. For the Tectonic DNS name, add a record which resolves to any node(s) you plan to use as workers.
bootcfg.example.comresolves to your
controllers.example.comresolves to any controller node
tectonic.example.comresolves to any worker nodes
The Tectonic Installer is a graphical application run on your laptop to create Tectonic clusters. It authenticates to
bootcfg via its API.
Your laptop running the Tectonic installer app must be able to access your
bootcfg instance. You will need the
client.key credentials created when setting up
bootcfg to complete the flow, as well as the
The commands to run the Tectonic Installer should be performed on your laptop.
Download the latest Tectonic release to your laptop and and extract it.
wget https://releases.tectonic.com/releases/tectonic_1.5.2-tectonic.1.tar.gz tar xzvf tectonic-1.5.2-tectonic.1.tar.gz cd tectonic
Make sure a current version of either the Google Chrome or Mozilla Firefox web browser is set as the default browser on the workstation where Installer will run.
Run the Tectonic Installer that matches your platform (
A tab should open in your browser. Follow the instructions to enter information needed for provisioning. You will need to enter machine MAC addresses, domain names, and your SSH public key.
Then, you'll be prompted to power on your machines via IPMI or by pressing the power button and guided through the rest of the bring-up. If needed, you can use the generated assets bundle kubeconfig to troubleshoot.
After the installer is complete, you'll have a Tectonic cluster and be able to access the Tectonic console. You are ready to deploy your first application on to the cluster!