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Change SSH Port on CentOS

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Change SSH Port on CentOS 8
First, create a backup of sshd_config.
# cp/etc/ssh/sshd_config/etc/ssh/sshd_config_backup
Then open your ssh configuration to change it
# sudo nano /etc/ssh/sshd_config
This command will open the SSH (SSHD) server configuration.

We make the following change to the sshd_config file
# SSH port
Port 11111 # port that needs to be changed

 

We then update the IPTABLES firewall by introducing a new SSHD port.
If you have your firewall turned off, you can skip this step.
If you are using centos 6, you can run this command
For centOS 6
# iptables -I INPUT -p tcp --dport 11111 --syn -j ACCEPT
# service iptables save
# semanage port -a -t ssh_port_t -p tcp 11111
For centOS 7/8
# firewall-cmd --add-port 11111/tcp --permanent
# firewall-cmd --add-port 11111/tcp
The configuration will start working after restarting SSH Server (SSHD) services or after restarting the server.

# service sshd resrtart
or
# systemctl restart sshd

If you have trouble getting to SSHD, you need to configure SELinux policy since you changed port 22 to 11111.

Run this command.
# semanage port -a -t ssh_port_t -p tcp 11111
Then restart the server.
# reboot

 

Centos 8 install SSH service step by step

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Centos 8 install SSH service step by step
Install the openssh package:
# dnf install openssh-server
Start the OpenSSH service by executing the following command:
# systemctl start sshd
Check the status of the sshd service.
# systemctl status sshd
Enable the SSH service to start after the reboot:
# systemctl enable sshd
Open the firewall rules to accept incoming traffic on SSH default port 22:
# firewall-cmd --zone=public --permanent --add-service=ssh
Connect to the SSH server with IP eg. 10.1.1.1 as the root user from a remote client machine:
$ ssh This email address is being protected from spambots. You need JavaScript enabled to view it..6

Clonezilla

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What is Clonezilla?

Clonezilla is a partition and disk imaging/cloning program similar to True Image® or Norton Ghost®. It helps you to do system deployment, bare metal backup and recovery. Three types of Clonezilla are available, Clonezilla live, Clonezilla lite server, and Clonezilla SE (server edition). Clonezilla live is suitable for single machine backup and restore. While Clonezilla lite server or SE is for massive deployment, it can clone many (40 plus!) computers simultaneously. Clonezilla saves and restores only used blocks in the hard disk. This increases the clone efficiency. With some high-end hardware in a 42-node cluster, a multicast restoring at rate 8 GB/min was reported.

Features:

  • Many File systems are supported: (1) ext2, ext3, ext4, reiserfs, reiser4, xfs, jfs, btrfs, f2fs and nilfs2 of GNU/Linux, (2) FAT12, FAT16, FAT32, NTFS of MS Windows, (3) HFS+ of Mac OS, (4) UFS of FreeBSD, NetBSD, and OpenBSD, (5) minix of Minix, and (6) VMFS3 and VMFS5 of VMWare ESX. Therefore you can clone GNU/Linux, MS windows, Intel-based Mac OS, FreeBSD, NetBSD, OpenBSD, Minix, VMWare ESX and Chrome OS/Chromium OS, no matter it's 32-bit (x86) or 64-bit (x86-64) OS. For these file systems, only used blocks in partition are saved and restored by Partclone. For unsupported file system, sector-to-sector copy is done by dd in Clonezilla.
  • LVM2 (LVM version 1 is not) under GNU/Linux is supported.
  • Boot loader, including grub (version 1 and version 2) and syslinux, could be reinstalled.
  • Both MBR and GPT partition formats of hard drive are supported. Clonezilla live also can be booted on a BIOS or uEFI machine.
  • Unattended mode is supported. Almost all steps can be done via commands and options. You can also use a lot of boot parameters to customize your own imaging and cloning.
  • One image restoring to multiple local devices is supported.
  • Image could be encrypted. This is done with ecryptfs, a POSIX-compliant enterprise cryptographic stacked filesystem.
  • Multicast is supported in Clonezilla SE, which is suitable for massive clone. You can also remotely use it to save or restore a bunch of computers if PXE and Wake-on-LAN are supported in your clients.
  • Bittorrent (BT) is supported in Clonezilla lite server, which is suitable for massive deployment. The job for BT mode is done by Ezio.
  • The image file can be on local disk, ssh server, samba server, NFS server or WebDAV server.
  • AES-256 encryption could be used to secures data access, storage and transfer.
  • Based on Partclone (default), Partimage (optional), ntfsclone (optional), or dd to image or clone a partition. However, Clonezilla, containing some other programs, can save and restore not only partitions, but also a whole disk.
  • By using another free software drbl-winroll, which is also developed by us, the hostname, group, and SID of cloned MS windows machine can be automatically changed.

Minimum System Requirements for Clonezilla live:

  • X86 or x86-64 processor
  • 196 MB of system memory (RAM)
  • Boot device, e.g. CD/DVD Drive, USB port, PXE, or hard drive

Limitations:

  • The destination partition must be equal or larger than the source one.
  • Differential/incremental backup is not implemented yet.
  • Online imaging/cloning is not implemented yet. The partition to be imaged or cloned has to be unmounted.
  • Due to the image format limitation, the image can not be explored or mounted. You can _NOT_ recovery single file from the image. However, you still have workaround to make it, read this.
  • Recovery Clonezilla live with multiple CDs or DVDs is not implemented yet. Now all the files have to be in one CD or DVD if you choose to create the recovery iso file.

License:

  • Clonezilla itself is licensed under the GNU General Public License (GPL) Version 2. However, to run Clonezilla, a lot of free and open source software, e.g. the Linux kernel and a minimal GNU/Linux OS, are required.

Which Clonezilla Shall I Use ?

  • Clonezilla Live: Clonezilla live allows you to use CD/DVD or USB flash drive to boot and run clonezilla (Unicast only)
  • Clonezilla lite server: Clonezilla lite server allows you to use Clonezilla live to do massively cloning (unicast, broadcast, multicast, bittorrent are supported)
  • Clonezilla SE: Clonezilla SE is included in DRBL, therefore a DRBL server must first be set up in order to use Clonezilla to do massively cloning (unicast, broadcast and multicast are supported)

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