For reasons that are not of any importance to this particular issue, I need to disable selinux, and have a bootable system.<br />
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With centos7, this requires adding a boot option flag (selinux=0) to the kernel command line.<br />
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To make this change permanent, and added it to the GRUB_CMDLINE_LINUX variable in /etc/default/grub. I confirmed that my changes are included in the resulting grub2-mkconfig output.<br />
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The problem is when I updated to kernel 3.10.0-123.el7.x86_64 (and possibly other updates, I haven't been running centos 7 very long), it completely ignored my changes in /etc/default/grub.<br />
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This resulted in a non-bootable system.<br />
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It's bad enough that systemd refuses to boot without selinux, but even worse that the mechanism to make such a change permanent is ignored by kernel update RPMS.
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