There are lots of different ways of installing Raspian to an sd card like win32diskimager and usb image writer but an even easier way is with dd. Things I am going to show you: How to locate your sd card in the command line. Where to download the image from. How to install the image […]
How to use apt-get on debian or ubuntu systems
The advanced package tool, also known as APT is a tool that is used for the easy installation, removal and upgrading of software on Debian/Ubuntu systems. Things that I will show you how to do: Search for packages using apt-get Update system package lists Upgrade software packages Install and remove specific software packages Check for […]
How to check the Apache Tomcat and Apache Httpd version in Linux
Tomcat versions can be obtained by version.sh in bin directory of TOMCAT_HOME. HTTPD component version can be viewed using httpd -V command in sbin directory of HTTPD_HOME. # [TOMCAT_HOME]/bin/version.sh # [HTTPD_HOME]/sbin/httpd -V For example: Apache Tomcat $ /opt/jws3/tomcat8/bin/version.sh Using CATALINA_BASE: /opt/jws3/tomcat8 Using CATALINA_HOME: /opt/jws3/tomcat8 Using CATALINA_TMPDIR: /opt/jws3/tomcat8/temp Using JRE_HOME: /home/rhel7/jdk8 Using CLASSPATH: /opt/jws3/tomcat8/bin/bootstrap.jar:/opt/jws3/tomcat8/bin/tomcat-juli.jar Server version: […]
Configure Systemd Service to Continue to Run when the user session ends (CentOS/RHEL 8)
Question: When a user logs out of their session any service they’ve started using the systemd user process is terminated. How this can be avoided? The systemd login manager will terminate any user services when their login session ends unless you enable user lingering with the enable-linger option. Use loginctl with the enable-linger option to […]
What is sticky bit in Linux
A directory whose sticky bit is set becomes an append-only directory, or, more accurately, a directory in which the deletion of files is restricted. A file in a sticky directory may only be removed or renamed by a user if the user has write permission for the directory and the user is the owner of […]
Unable To Mount Samba Share when FIPS is enabled
The Problem Unable to mount Samba share. Attempting to create a mount for a samba share fails. However is accessible with smbclient. /var/log/messages have below errors: Apr 3 22:29:53 localhost kernel: CIFS VFS: could not allocate crypto hmacmd5 Apr 3 22:29:53 localhost kernel: CIFS VFS: could not crypto alloc hmacmd5 rc -2 Apr 3 22:29:53 […]
What are Oracle Data Guard Protection Modes and how to configure them
Data Protection Modes and Redo Transport When you define a redo transport mode, you are configuring the shipment of log files from a redo source to a redo destination. The redo source is usually a primary database or a Far Sync instance. A redo destination is usually a physical or logical standby database. It is […]
Monitoring a Data Guard Broker Configuration using Enterprise Manager Cloud Control
Enterprise Manager Cloud Control provides a graphical user interface for monitoring the Data Guard configuration. The following sections in this post describe the information that you can view on the Data Guard Overview page and its related pages. Viewing the Data Guard Configuration Status On the Data Guard Overview page, you can view the status […]
How to identify which Volume Group is active in LVM
The way to check the status of VG is: lvs or lvdisplay. vgchange performs operation on underline LV, it activates or deactivates the number of LVs in that volume group. If there are no LVs in particular VG, the VG activation or deactivation, both will return the same result and this operation doesn’t take any […]
Beginners Guide to Multitenant Architecture and RAC
Non-CDB Architecture In Oracle Database 12c, there are two possible configurations, non-CDB and multitenant container database. In Oracle 11g database, the only kind of database that is supported is a non-CDB. The old architecture is referred to as the non-CDB architecture—the term non-CDB will be used as a shorthand for an occurrence of a pre-12.1 […]