The Problem When adding an extra repository of the public yum into existing yum repository configuration file, the following errors are shown: # yum repolist Loaded plugins: langpacks, ulninfo File contains parsing errors: file:///etc/yum.repos.d/public-yum-ol7.repo [line 91]: name=Latest Unbreakable Enterprise Kernel Release 4 for Oracle Linux 7Server (x86_64) [line 92]: baseurl=https://yum.oracle.com/repo/OracleLinux/OL7/UEKR4/x86_64/ [line 93]: … [Read more...] about Getting “parsing errors” When Running ‘yum repolist’
How to Install Apache, MariaDB, and PHP (FAMP) stack on FreeBSD 11
In this tutorial we will show you how to install Apache, MariaDB, and PHP on FreeBSD 11. If you don't know FAMP is the acronym of FreeBSD, Apache, MySQL/MariaDB, PHP. FreeBSD 11 is the latest version right now when this article was made. Prerequisites Before you begin with this guide, you should at least have basic knowledge of linux or unix, know basic shell command for linux or unix, have login as root user and of course you need FreeBSD 11 installed on your PC or server. Step 1 – … [Read more...] about How to Install Apache, MariaDB, and PHP (FAMP) stack on FreeBSD 11
How to configure apache virtual host on ubuntu
In this tutorial, we will guide you to configure the apache virtual host or vhost on ubuntu 16.04. Using virtual host allow the administrator to use one server to host multiple domains or sites off of a single interface or IP by using a matching mechanism. Basically, you can you one IP address to server multiple domain names. Virtual host method is widely used in a shared hosting provider. Prerequisites Before you begin with this guide, you should at least have basic knowledge of linux, know … [Read more...] about How to configure apache virtual host on ubuntu
How to Clone Linux disk partition over network using dd
In this tutorial, we will show you how to clone Linux harddisk partition over a network, in this tutorial we will use dd command. For the guys who don’t know what dd is - it is a command-line utility for Unix and Unix-like operating systems whose primary purpose is to convert and copy files. Clone Linux harddisk has advantages because we don’t need to reinstall and configure again the applications especially in Linux that we used as a server. Prerequisites This article assumes you have at … [Read more...] about How to Clone Linux disk partition over network using dd
How to Change Timezone from CST To EST in CentOS/RHEL 7 Server
Question: How to change timezone in CentOS/RHEL 7 server from EST to CST. Follow the below steps to change the timezone to CST. (Execute the below commands as root user) 1. List all the available timezones using the below command: # timedatectl list-timezones 2. Locate the correct timezone you need that is in the central timezone. 3. Set the specific timezone. For example, to set central timezone: # timedatectl set-timezone America/Chicago 4. Run the "date" command to verify the … [Read more...] about How to Change Timezone from CST To EST in CentOS/RHEL 7 Server
‘lxc_cgfs – Device or resource busy – failed to set memory.use_hierarchy to 1; continuing’ – error while starting LXC container
The Problem While starting lxc it gives the below error: lxc-start 1491315722.354 ERROR lxc_cgfs - Device or resource busy - failed to set memory.use_hierarchy to 1; continuing lxc-start 1491315722.354 ERROR lxc_cgfs - Device or resource busy - failed to set memory.use_hierarchy to 1; continuing lxc-start 1497957841.930 ERROR lxc_cgfs - Device or resource busy - failed to set memory.use_hierarchy to 1; continuing lxc-start 1497957841.937 ERROR lxc_cgfs - Device or resource busy - failed to … [Read more...] about ‘lxc_cgfs – Device or resource busy – failed to set memory.use_hierarchy to 1; continuing’ – error while starting LXC container
How to Change Timezone Settings on Exadata
After Oracle Linux 7, Timezone settings method has been changed. Time Zone is configured during the deployment of the Exadata Database Machine. If there is a requirement to change the Time Zone settings after deployment, it requires modifying the following components: Storage Cells Compute Nodes Pre-requirements 1. Stop CRS stack on all the compute nodes: # [GI_HOME]/bin/crsctl stop crs 2. Stop processes on the cells: # cellcli -e alter cell shutdown services all 3. Complete … [Read more...] about How to Change Timezone Settings on Exadata
How To Calculate The Required Network Bandwidth Transfer Of Redo In Data Guard Environments
It's important to transfer and apply redo as fast as possible in a Data Guard environment. To achieve this we have to calculate the required network bandwidth based on the redo generation rate on the primary database. The formula used (assuming a conservative TCP/IP network overhead of 25%) for calculating the network bandwidth is: Required bandwidth = ((Redo rate bytes per sec. / 0.75) * 8) / 1,000,000 = bandwidth in Mbps Measuring the Peak Redo Rate Use the Oracle Statspack utility for … [Read more...] about How To Calculate The Required Network Bandwidth Transfer Of Redo In Data Guard Environments
“passwd: Module is unknown” – error while changing the password in CentOS/RHEL 6
The Problem While changing password using the passwd command, the following error appears: "passwd: Module is unknown" The Solution There is a unknown PAM module pam_pwquality.so in /etc/pam.d/system-auth file. The pam_pwquality.so module should be used in CentOS/RHEL 7 rather than CentOS/RHEL 6. # cat /etc/pam.d/system-auth # This file is auto-generated. # User changes will be destroyed the next time authconfig is run. auth required pam_env.so auth sufficient pam_unix.so nullok … [Read more...] about “passwd: Module is unknown” – error while changing the password in CentOS/RHEL 6
How to Switch Password Algorithm on CentOS/RHEL
Question: How to change the password hashing algorithm on a CentOS/RHEL system. 1. Check to current hashing algorithm : # authconfig --test| grep hash password hashing algorithm is sha512 2. Change default password hashing algorithm : # authconfig --passalgo=md5 --update or # authconfig --passalgo=sha5 --update Note : The new algorithm in passwd/shadow files will apply until next execution of passwd command. … [Read more...] about How to Switch Password Algorithm on CentOS/RHEL