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72 lines
2.5 KiB
Text
72 lines
2.5 KiB
Text
// Module included in the following assemblies:
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//
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// changing-selinux-states-and-modes.adoc
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[#{context}-enabling-selinux]
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= Enabling SELinux
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When enabled, SELinux can run in one of two modes: enforcing or permissive. The following sections show how to permanently change into these modes.
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While enabling SELinux on systems that previously had it disabled, to avoid problems, such as systems unable to boot or process failures, follow this procedure.
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.Prerequisites
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* The [package]`selinux-policy-targeted`, [package]`selinux-policy`, [package]`libselinux-utils`, and [package]`grubby` packages are installed. To check that a particular package is installed:
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+
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[subs="quotes"]
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----
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$ *rpm -q _package_name_*
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----
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.Procedure
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. If your system has SELinux disabled at the kernel level (this is the recommended way, see xref:{context}-disabling-selinux[]), change this first. Check if you have the `selinux=0` option in your kernel command line:
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+
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[subs="quotes"]
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----
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$ *cat /proc/cmdline*
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BOOT_IMAGE=... ... selinux=0
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----
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.. Remove the `selinux=0` option from the bootloader configuration using [command]`grubby`:
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+
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[subs="quotes"]
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----
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$ *sudo grubby --update-kernel ALL --remove-args selinux*
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----
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.. The change applies after you restart the system in one of the following steps.
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. Ensure the file system is relabeled on the next boot:
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+
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[subs="quotes"]
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----
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$ *sudo fixfiles onboot*
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----
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. Enable SELinux in permissive mode. For more information, see xref:{context}-changing-to-permissive-mode[].
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. Restart your system:
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+
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[subs="quotes"]
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----
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$ *reboot*
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----
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. Check for SELinux denial messages.
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+
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[subs="quotes"]
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----
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$ *sudo ausearch -m AVC,USER_AVC,SELINUX_ERR,USER_SELINUX_ERR -ts recent*
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----
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. If there are no denials, switch to enforcing mode. For more information, see xref:{context}-changing-to-enforcing-mode[].
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To run custom applications with SELinux in enforcing mode, choose one of the following scenarios:
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* Run your application in the `unconfined_service_t` domain.
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// See <<Targeted_Policy-Unconfined_Processes>> for more information.
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* Write a new policy for your application. See the link:https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/using_selinux/writing-a-custom-selinux-policy_using-selinux[Writing a custom SELinux policy] chapter in the link:https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/using_selinux/index[RHEL 8 Using SELinux] document for more information.
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// Temporary changes in modes are covered in <<{context}-selinux-states-and-modes>>.
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