Enabling rsh, rlogin, rexec on Redhat Linux

1) Install rsh and rshd yum install rsh rsh-server 2) Edit the configuration file /etc/xinetd.d/rsh service shell { socket_type = stream wait = no user = root log_on_success += USERID log_on_failure […]


Validating AES hardware encryption & decryption on Linux

The Intel Advanced Encryption Standard (AES) or New Instructions (AES-NI) enables hardware encryption and decryption. “AES” is an extension to the x86 instruction set architecture for microprocessors from Intel and […]


Linux kernel tuning for Apache Hadoop & Spark

Settings for all Linux OS levels sysctl -w vm.swappiness=5 sysctl -w vm.dirty_background_ratio=5 sysctl -w vm.dirty_ratio=40 sysctl -w vm.dirty_writeback_centisecs=500 sysctl -w vm.dirty_expire_centisecs=100 Additional settings for Redhat 6.x or greater Disable Transparent […]


Allowing core files of unlimited size in Linux

To allow core files of any size: 1) Check limits.conf ############################################ #/etc/security/limits.conf # #<user> soft core unlimited #<user> hard core unlimited # How to set unlimited for all users * […]