Install Katello on CentOS 7

We’re going to install Foreman with Katello on CentOS 7.

This article is part of the Homelab Project with KVM, Katello and Puppet series.

Katello vs Spacewalk vs Red Hat Satellite

We have been using Spacewalk for quite some time. Spacewalk is an upstream product for Red Hat Satellite 5. Red Hat Satellite 6 is a re-engineering of the Red Hat Satellite product, it has been built from the ground-up on different and more modern technologies. Red Hat Satellite 6 is a federation of several upstream open source projects, including Katello, Foreman, Pulp and Candlepin. All products are open source projects, and Red Hat is the biggest contributor in each case. What does each product do?

  1. Foreman: provisioning on new clients.
  2. Pulp: patch and content (package repository) management.
  3. Candlepin: subscription and entitlement management.
  4. Puppet: configuration management (actual running of modules assigned in Foreman).
  5. Katello: unified workflow and WebUI for content (Pulp) and subscriptions (Candlepin).

Initially Katello was a standalone application, but it’s now a plugin to the Foreman. Foreman is a complete lifecycle management tool for physical and virtual servers. When we talk about Katello, we have in mind a Foreman server with Katello plugin.


Software used in this article:

  1. CentOS 7
  2. Foreman 1.16
  3. Katello 3.5
  4. Puppetserver 2.8
  5. Puppet 4.10

Virtual Machine Hardware

The VM that we are going to use for Katello has the following specifications:

  1. 2 CPU cores
  2. 10GB RAM + 4GB SSD-backed swap
  3. /var/lib/pulp – 10GB
  4. /var/lib/mongodb – 10GB
  5. /var/ftp/pub – 10GB
  6. /tmp – 1GB
  7. / – 10GB
  8. /mnt/backup – 50GB

The XFS file system is recommended for Katello because it does not have the inode limitations that ext4 does. As Katello uses a lot of symbolic links it is likely that our system will run out of inodes if using ext4 and the default number of inodes.


See the image below to identify the homelab part this article applies to.

Time Sync

According to Katello documentation provided here, several Katello features will not function well if there is minor clock skew. Setup chronyd:

# yum install chrony -y
# systemctl enable chronyd && systemctl start chronyd
# chronyc sources

DNS is configured to use our homelab servers:

# cat /etc/resolv.conf

Install Katello

Configure Firewall

# firewall-cmd --permanent --add-service={RH-Satellite-6,ftp,tftp}
# firewall-cmd --permanent --add-port=8000/tcp
# firewall-cmd --reload
# firewall-cmd --list-all
public (active)
  target: default
  icmp-block-inversion: no
  interfaces: enp0s17
  services: ssh dhcpv6-client RH-Satellite-6 ftp tftp
  ports: 8000/tcp
  masquerade: no
  rich rules:

Add Repositories

# yum -y localinstall
# yum -y localinstall
# yum -y localinstall
# yum -y localinstall
# yum -y install foreman-release-scl python-django
# yum -y update

Install Katello

Make sure that you have at least 8 GB of total RAM free before running the installer.

# yum -y install katello

Setup the Foreman Server

At this point the foreman-installer should be available to setup the server. Foreman can be installed without Katello, as Katello is now a plugin to Foreman (Katello was a standalone application in early days, not the case anymore).

# foreman-installer --list-scenarios
Available scenarios
  Foreman Proxy (use: --scenario foreman-proxy-content)
        Install a stand-alone Foreman Proxy.
  Foreman (use: --scenario foreman)
        Default installation of Foreman
  Katello (use: --scenario katello)
        Install Foreman with Katello

Foreman is the main part, as whole architecture is based on it. The rest is just integration to do certain tasks. To customise the installation, check a list of parameters available:

# foreman-installer --scenario katello --help

The answer file /etc/foreman-installer/scenarios.d/katello-answers.yaml can be used as well. We want TFTP and Puppet, but we don’t need DHCP and DNS as we already have infrastructure for this.

# foreman-installer \
 --scenario "katello" \
 --foreman-initial-organization "Lisenet" \
 --foreman-initial-location "HomeLab" \
 --foreman-proxy-dhcp "false" \
 --foreman-proxy-dns "false" \
 --foreman-proxy-tftp "true" \
 --foreman-proxy-puppet "true" \
 --foreman-proxy-puppetca "true" \
 --foreman-puppetrun "true" \
 --foreman-proxy-puppetrun-provider "ssh" \
 --puppet-runinterval "3600"

In case we forget the admin password, we can use the following command to reset it:

# foreman-rake permissions:reset

This will reset the password of the default admin user to the one printed on the command line. After installation of Katello, we need to trust Katello’s CA certificate on our system (instructions for how to do that on a Linux OS, Chrome, Firefox etc can be found on the Internet). We will find katello-server-ca.crt in the /pub directory of the Katello server (in our case http://katello.hl.local/pub/katello-server-ca.crt).

Remove Katello

If required, Katello can be removed this way:

# katello-remove

Puppet Issues when /tmp is Mounted as noexec

This is something we learnt the hard way. In some cases, especially for RHEL 7 installations, if the /tmp directory is mounted as noexec, Puppet server may fail to run correctly, and we may see an error in the Puppet server logs similar to the following:

puppetserver[]: Failed to load feature test for posix: can't find user for 0
puppetserver[]: Cannot run on Microsoft Windows without the win32-process, win32-dir and win32-service gems: Win32API only supported on win32
puppetserver[]: Puppet::Error: Cannot determine basic system flavour

This is caused by the fact that JRuby contains some embedded files which need to be copied somewhere on the filesystem before they can be executed. To work around the issue, we can either mount the /tmp directory without noexec (not recommended), or we can choose a different directory to use as the temporary directory for the Puppet server process. For the latter option, we need to set the permissions of the directory to 1777.

# mkdir -m 1777 /opt/tmp

Open the file /etc/sysconfig/puppetserver for editing and change the following line specifying the tmpdir:

JAVA_ARGS="-Xms2G -Xmx2G -XX:MaxPermSize=256m"

Foreman Providers

Several Foreman packages are available to add functionality:

# yum search foreman-|grep "^foreman-.*support"
foreman-assets.noarch : Foreman asset pipeline support
foreman-console.noarch : Foreman console support
foreman-ec2.noarch : Foreman Amazon Web Services (AWS) EC2 support
foreman-gce.noarch : Foreman Google Compute Engine (GCE) support
foreman-libvirt.noarch : Foreman libvirt support
foreman-mysql2.noarch : Foreman mysql2 support
foreman-openstack.noarch : Foreman OpenStack support
foreman-ovirt.noarch : Foreman oVirt support
foreman-plugin.noarch : Foreman plugin support
foreman-postgresql.noarch : Foreman Postgresql support
foreman-rackspace.noarch : Foreman Rackspace support
foreman-sqlite.noarch : Foreman sqlite support
foreman-vmware.noarch : Foreman VMware support

If we were to run on VMware, we would likely want to install the foreman-vmware package.

Upgrade Katello 3.5 to 3.6

Create a Backup

Take a snapshot of the virtual machine. Optionally, backup Katello:

# katello-backup /mnt/backup/ --features=all -y

Update the System

Install all available updates, if a new kernel is deployed, reboot the server.

# yum -y update


Update the Foreman and Katello release packages:

# yum update -y
# yum update -y
# yum clean all && yum update -y foreman-release-scl

Update Packages and Run the Installer

# katello-service stop
# yum -y update
# foreman-installer --scenario katello --upgrade

4 thoughts on “Install Katello on CentOS 7

  1. My installation keeps failing on ssl validation error. I will try again

    Also, why you have disabled dhcp,tftp i.e. –foreman-proxy-dhcp=false –foreman-proxy-tftp=false
    Don’t we need them for provisioning ?

    • You do need them for provisioning, yes. But I already had dedicated DNS/DHCP/NTP/FTP servers in my environment, and the plan was to use capsule with external services, so I set them to false during the installation.

    • No, I never tried Katello with Ansible. My whole lab is based on Puppet, therefore never had a need for it I’m afraid.

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