Configuring Postfix as a Null Client

Configuring Postfix as a Null Client This howto assumes that the relay server’s IP address is 192.168.1.22 and is running RHEL/CentOS 7. Only mail from the 192.168.1.0/24 network should be accepted and relayed. Install Postfix [root@rhce-server ~]# yum install postfix Configure Systemd [root@rhce-server ~]# systemctl enable postfix [root@rhce-server ~]# ^enable^start Configure the Firewall [root@rhce-server ~]# […]

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unbound RHCE

This howto shows the steps needed to configure unbound for DNS caching and forwarding from the 192.168.1.0/24 network. It assumes the server’s IP address is 192.168.1.22 and is running RHEL/CentOS 7. Installation [root@rhce-server ~]# yum install unbound Configure Systemd [root@rhce-server ~]# systemctl enable unbound ln -s ‘/usr/lib/systemd/system/unbound.service’ ‘/etc/systemd/system/multi-user.target.wants/unbound.service’ [root@rhce-server ~]# ^enable^start systemctl start unbound Configure […]

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rhel7 root user password cracking

Edit current kernel version into the grub menu bar, and finally add rd.break parameters linux6 linux16 /vmlinuz-3.10.0-327.el7.x86_64 root=/dev/mapper/rhel-root ro rd.lvm.lv=rhel/root rd.lvm.lv=rhel/swap rhgb quiet rd.break Use ctrl + x to reboot the system to start Remount the ‘root’ file system, and change into the / sysroot mount -oremount,rw /sysroot chroot /sysroot Changing the root password echo […]

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