Configure NAT for virtual machines in Proxmox 5 VE

By default, Proxmox creates the Linux bridge vmbr0, which looks through the external interface and all other virtual machine interfaces connected to this bridge will also look to the world. Therefore, it is necessary to raise the NAT from under which all other virtual machines will exit.

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How to set up SSH keys on CentOS 7

     SSH keys can serve as a means of identifying yourself to an SSH server using public-key cryptography and challenge-response authentication. The major advantage of key-based authentication is that in contrast to password authentication it is not prone to brute-force attacks and you do not expose valid credentials, if the server has been compromised. […]

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How to set up a software RAID

       RAID 1 consists of an exact copy (or mirror) of a set of data on two or more disks. A classic RAID 1 mirrored pair contains two disks. The array will continue to operate so long as at least one member drive is operational.

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How to restore grub2

1) Boot a server in rescue mode2) Check partitions[root@rescue /]# fdisk -lDisk /dev/sda: 3.7 TiB, 4000787030016 bytes, 7814037168 sectorsUnits: sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisklabel type: gptDisk identifier: 961524F0-9337-4FC8-B4AD-C65D8750BF58Device          Start        End    Sectors  Size Type/dev/sda1        2048    1048575    1046528  511M EFI System/dev/sda2 […]

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