Security-Enhanced Linux (SELinux) is a security enhancement to Linux.
Developed by Red Hat, it is an implementation of mandatory access controls (MAC) on Linux. Mandatory access controls allow an administrator of a system to define how applications and users can access different resources such as files, devices, networks and inter-process communication. SELinux also enhances security by making an OS restrictive by default.
After being historically used by government agencies, SELinux is now industry standard and is enabled by default on CentOS 7 and 8. To check whether SELinux is enabled and enforcing on your system, use
# getenforce Enforcing
We provide two RPMs (Red Hat packages) that enable Rancher products to function properly on SELinux-enforcing hosts:
- Installing the rancher-selinux RPM
- Configuring the Logging Application to Work with SELinux
To allow Rancher to work with SELinux, some functionality has to be manually enabled for the SELinux nodes. To help with that, Rancher provides a SELinux RPM.
rancher-selinux RPM only contains policies for the rancher-logging application.
rancher-selinux GitHub repository is here.
rke2-selinux provides policies for RKE2. It is installed automatically when the RKE2 installer script detects that it is running on an RPM-based distro.
rke2-selinux GitHub repository is here.
For more information about installing RKE2 on SELinux-enabled hosts, see the RKE2 documentation.
Installing the rancher-selinux RPM
Requirements: The rancher-selinux RPM was tested with CentOS 7 and 8.
1. Set up the yum repo
Set up the yum repo to install
rancher-selinux directly on all hosts in the cluster.
In order to use the RPM repository, on a CentOS 7 or RHEL 7 system, run the following bash snippet:
# cat << EOF > /etc/yum.repos.d/rancher.repo [rancher] name=Rancher baseurl=https://rpm.rancher.io/rancher/production/centos/7/noarch enabled=1 gpgcheck=1 gpgkey=https://rpm.rancher.io/public.key EOF
In order to use the RPM repository, on a CentOS 8 or RHEL 8 system, run the following bash snippet:
# cat << EOF > /etc/yum.repos.d/rancher.repo [rancher] name=Rancher baseurl=https://rpm.rancher.io/rancher/production/centos/8/noarch enabled=1 gpgcheck=1 gpgkey=https://rpm.rancher.io/public.key EOF
2. Installing the RPM
Install the RPM:
yum -y install rancher-selinux
Configuring the Logging Application to Work with SELinux
Requirements: Logging v2 was tested with SELinux on RHEL/CentOS 7 and 8.
Applications do not automatically work once the
rancher-selinux RPM is installed on the host. They need to be configured to run in an allowed SELinux container domain provided by the RPM.
To configure the
rancher-logging chart to be SELinux aware, change
global.seLinux.enabled to true in the
values.yaml when installing the chart.