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Setup Information So we have the below setup of Windows FQDN wo which we need to authenticate from our Linux Servers. DOMAIN = WINAD.LOCAL AD FQDN = adsrv.winad.local There are three ways to authenticate Linux system with AD Using sama and krb5 Using adcli with krb5 and sssd Using realmd with krb5 and sssd Method 1 - Using SAMBA and krb5 Install required packages Required Packages - Install below packages using package manager such as yum or … [Read more...] about How to Join or Authenticate Linux Server to Windows Active Directory

This post explains how to free up space when files under /var/cache/yum is filling up the disk space. This is normal behavior as the cache would increase its size based on the frequency of syncing with the yum server. Its an administrative task provide adequate space. This should be corrected by either running: # yum clean all The above command cleans all cached files from any enabled repository. It is useful to run this from time to time to make sure there is nothing using unnecessary … [Read more...] about /var/cache/yum Constantly Filling Files System in CentOS/RHEL

Want to change the order of the authentication method that ssh tries while establishing a remote connection. How to change it? How to specify the order in which the client should try the protocol of authentication methods while establishing a connection with the remote host? Changing Order of Authentication Methods of SSH PreferredAuthentications is the option which specifies the order in which the client should try the protocol of authentication methods. This allows a client to prefer one … [Read more...] about How to change the order of the authentication methods of ssh in CentOS/RHEL

How to enable dual authentication in ssh? How to force the users to use both key and password with ssh while authenticating in Linux. By default, sshd will not force dual authentication. In order to force ssh for dual authentication follow the steps outlined below. For CentOS/RHEL6 Add following directive to /etc/ssh/sshd_config configuration file. # vi /etc/ssh/sshd_config RequiredAuthentications2 publickey,password To disable dual authentication for particular user, add on extra … [Read more...] about How to force the users to use both key and password with ssh in Linux

Squid is a web proxy application with a variety of configurations and uses. Squid has a large number of access controls and supports different protocols, such as HTTP, HTTPS, FTP, and SSL. In this post, we will see how to use Squid as an HTTP proxy. The Setup A proxy server can be software or it can also be hardware, such as a bluecoat proxy. In this post, we will setup a proxy as software on a virtual device. The chosen software will be squid, but you can use a wide range of other … [Read more...] about How to Setup a squid proxy server on CentOS/RHEL 7

The Bluetooth kernel modules (bluetooth, bnep, btusb/hci_usb) are automatically loaded when the system boots and the Bluetooth service is enabled. The kernel modules can be prevented from being loaded by using system-wide modprobe rules. Blacklist Bluetooth modules Run the following commands to blacklist the Bluetooth modules, thus preventing them from loading if Bluetooth hardware is present. On CentOS/RHEL 5 and 6: # echo "install bnep /bin/true" >> … [Read more...] about How to Disable Bluetooth in CentOS/RHEL 5,6,7