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Linux operation and maintenance of automated tools Cobbler About operating system installation automation, the earlier we use RedHat launched Kickstart to batch install the operating system, in recent years, RedHat has introduced a Cobbler. Cobbler development using Python, compact and lightweight, able to complete the installation of the system, and even manage some services. (Known […] Linux operation and maintenance of automated tools Kickstart Bulk Kickstart installation of the operating system tools, RedHat earlier launch of the product (not much to say, now playing Cobbler friends Test environment: CentOS 6.6 x86_64 minimal First, the installation package yum -y install dhcp tftp-server syslinux nfs-utils kickstart cp /usr/share/doc/dhcp-4.1.1/dhcpd.conf.sample /etc/dhcp/dhcpd.conf […] How to install Redis on a Centos 6.5 & Centos 7.0 Server Redis is an open source, BSD licensed, advanced key-value store. It is often referred to as a data structure server since keys can contain strings, hashes, lists, sets and sorted sets. How To Install Redis on Centos 7 # wget -r –no-parent -A […] What is sysctl? sysctl is an interface to view and dynamically change parameters in Linux and other *NIX operating systems. In Linux, most of the dynamic Kernel settings can be changed via sysctl. The parameters set by sysctl are also available under the virtual /proc filesystem. How do I use sysctl? To read values you’ve […] This walk-through worked on a virtual server running RHEL 6.7 in a VMware environment. As I rebuilt an existing VMware guest that was being scheduled to go into production, I realized I did not rename the default volume group from vg_hostname to rootvg. You must be root user and it is extremely important to backup […] for file in /proc/*/status ; do awk ‘/VmSwap|Name/{printf $2 ” ” $3}END{ print “”}’ $file; done | sort -k 2 -n -r | less Have you ever logged in to a server, ran free, seen that a bit of swap is used and wondered what’s in there? It’s usually not very indicative of anything, or even overly helpful knowing what’s in there, mostly it’s a curiosity thing. Either way, starting from kernel 2.6.16, we can find out using smaps […] FreeIPA is a solution for managing users, groups, hosts, services, and much, much more. It uses open source solutions with some Python glue to make things work. Identity Management made easy for the Linux administrator. FreeIPA is an open source alternative to Microsoft Directory Server. It provides the following functionality: Centralised LDAP based authorisation Kerberos […] CentOS 6.7 ships with kernel 2.6 and it’s a quite old for now(CentOS 7 already comes with 3.10), but compile a kernel on CentOS is a mess and it’s not recommended. But fear no more, guys from Elrepo took care of that for us and made a package, let’s see how we can install it. […] Docker is an open platform for Sys Admins and developers to build, ship and run distributed applications. Applications are easy and quickly assembled from reusable and portable components, eliminating the silo-ed approach between development, QA, and production environments. Individual components can be microservices coordinated by a program that contains the business process logic (an evolution […] |
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