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Change SSH Port on CentOS
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
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
httpd.service failed
centos httpd.service failed
Test apache
apachectl configtest
[root@bis etc]# apachectl configtest
httpd: Syntax error on line 364 of /etc/httpd/conf/httpd.conf: Syntax error on line 202 of /etc/httpd/conf.d/virtuals.conf: /etc/httpd/conf.d/virtuals.conf:202: was not closed.
check virtuals.conf line xxx
Here is the output of systemctl status httpd.service
[root@bis log]# systemctl status httpd.service
● httpd.service - The Apache HTTP Server
Loaded: loaded (/usr/lib/systemd/system/httpd.service; enabled; vendor preset: disabled)
Active: failed (Result: exit-code) since Fri 2019-10-18 15:12:00 CEST; 6min ago
Docs: man:httpd(8)
man:apachectl(8)
Process: 11550 ExecStop=/bin/kill -WINCH ${MAINPID} (code=exited, status=1/FAILURE)
Process: 11548 ExecStart=/usr/sbin/httpd $OPTIONS -DFOREGROUND (code=exited, status=1/FAILURE)
Main PID: 11548 (code=exited, status=1/FAILURE)
Oct 18 15:12:00 b1s.eu systemd[1]: Starting The Apache HTTP Server...
Oct 18 15:12:00 b1s.eu httpd[11548]: httpd: Syntax error on line 364 of /etc/httpd/conf/httpd.conf: Synta...osed.
Oct 18 15:12:00 b1s.eu systemd[1]: httpd.service: main process exited, code=exited, status=1/FAILURE
Oct 18 15:12:00 b1s.eu kill[11550]: kill: cannot find process ""
Oct 18 15:12:00 b1s.eu systemd[1]: httpd.service: control process exited, code=exited status=1
Oct 18 15:12:00 b1s.eu systemd[1]: Failed to start The Apache HTTP Server.
Oct 18 15:12:00 b1s.eu systemd[1]: Unit httpd.service entered failed state.
Oct 18 15:12:00 b1s.eu systemd[1]: httpd.service failed.
Hint: Some lines were ellipsized, use -l to show in full.
Resest root password on CentOS 7
Resest root password on CentOS 7
Start server, at the boot menu press e to edit the selected item
Finde the line with "ro"
remove ro and type rw init=/sysroot/bin/sh
Save changes - CTRL + X
in single user mode type
chroot /sysroot
You can now change the password command:
passwd root
After creating the password, update SELinux parameters:
touch /.autorelabel
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