Editing Linux/RHEL

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* [[SELinux]] - Mandatory Access Control, to stop exploits by preventing applications from exhibiting unauthorized behavior, even if they have root access.
* [[SELinux]] - Mandatory Access Control, to stop exploits by preventing applications from exhibiting unauthorized behavior, even if they have root access.
** Notice that OpenVZ cannot use SELinux: it would be ineffective anyway. The Host kernel has to handle Mandatory Access Control for all containers, and Proxmox OpenVZ does this with AppArmor. If this is not acceptable, use KVM instead. Β 
** If you're on OpenVZ and cannot use SELinux, an AppArmor compatible system such as Debian/Ubuntu/OpenSUSE is probably a better idea. But if you need CentOS anyway, consider setting up SMACK as an alternative, a MAC system integrated into the Linux kernel.
* [[Fail2Ban]] - Looks out for malicious or excessive SSH login attempts and then bans them.
* [[Fail2Ban]] - Looks out for malicious or excessive SSH login attempts and then bans them.
* Smart - Check the health of your drives and notify the admin by email or whatever if they are bad.
* Smart - Check the health of your drives and notify the admin by email or whatever if they are bad.
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