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Centos : add user as sudoer

Various methods on how to add a user as sudoer (with ou without password).

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git useful commands

Undo delete before commit Checkout specific commit

docker : useful commands

Clean all unused data Remove all images Remove all <none> images Remove all containers

Distribute ssh keys across linux servers

Distribute the ssh keys Some situations requires that a server can ssh without login to the a set of remote hosts. This is achieved by deploying the proper ssh keys. To a single host To several machines To distribute the... Continue Reading →

Ansible : check for required variables before role execution

How to check for required variables in ansible before executing a task

Run docker as user on CentOS 7

See how to allow a standard user to run docker command

Tomcat load balancing

How to add load balancing capabilities to a cluster of Tomcat web applications using mod_proxy_http, mod_proxy_ajp or modjk and how to monitor the status of the load balancer.

Three ways to reverse proxy apache tomcat

Three ways to reverse proxy a tomcat server instance using apache and mod_proxy_http, mod_proxy_ajp or modjk.

Linux iptables example

Introduction The following show a typical example of Linux iptables firewall configuration. Iptable script Startup script

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