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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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$ *rpm -q _package_name_*
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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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$ *cat /proc/cmdline*
BOOT_IMAGE=... ... selinux=0
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Remove the `selinux=0` option from the bootloader configuration using [command]`grubby`:
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$ *sudo grubby --update-kernel ALL --remove-args selinux*
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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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$ *sudo fixfiles onboot*
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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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$ *reboot*
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Check for SELinux denial messages.
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$ *sudo ausearch -m AVC,USER_AVC,SELINUX_ERR,USER_SELINUX_ERR -ts recent*
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If there are no denials, switch to enforcing mode. For more information, see link:{context}-changing-to-enforcing-mode[].
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