Using screen command to share session on Linux system

Lets take a look at how to share existing ssh session using command called screen. It is very useful in case where you have to show your users something remotely. First install screen program – We assume CentOS7 yum install screen System1 You can create multiple screen sessions or share existing on Create multiple screen…

Changing name of salt minion CentsOS 7

We run into situation when we needed to change name of already added salt minion. Here is few simple steps that will get this done. On Salt minion Stop the Salt-Minion Service systemctl stop salt-minion Delete the current keys cd /etc/salt/pki/minion/ rm -rf minion.pub minion.pem Change the minions id in /etc/salt/minion_id vim /etc/salt/minion_id myminion.prolinuxhub.com On…

Building MariaDB Master Salve replication cluster CentOS 7

Assumptions: We have 2 Linux VMs with 5.5.56-MariaDB. IP address 192.168.0.222(cluster1.local) and 192.168.0.223(cluster2.local) We have 3 existing databases on cluster1.local – mydb1, mydb2, mydb3 Setup Master (cluster1.local) Edit my.cnf file vi /etc/my.cnf bind-address = 0.0.0.0 server_id=1 log-basename=master1 log-bin replicate-do-db = mydb1 replicate-do-db = mydb2 Restart MariaDB systemctl restart mariadb Inside MariaDB prompt GRANT REPLICATION SLAVE…

Basic salt on CentOS7 both server and client

Very quick look at how to install and use Saltstack on one vm both server and minion. Also we loot at some basic commands that are needed to manage salt deployment Installing salt Salt server can be installed in many ways Option 1 (saltstack repo) yum install https://repo.saltstack.com/yum/redhat/salt-repo-latest-2.el7.noarch.rpm yum clean expire-cache yum install salt-master yum…

Using Vagrant, VirtualBox and Ansible with CentOS 7

This would be the case when you need to test playbooks locally before using Ansible to deploy them. We assume you already have installed Vagrant, Ansible and VirtualBox. Ansible is one of many provisioners integrated with Vagrant. Lets see how it works Create Vagrant box with CentOS 7 mkdir centtest cd centtest sudo vagrant init…

Installing and using docker CentOS7

We will not cover what docker does and how it works. We assume you already familiar with basic concepts. We will look into basics of installing and operating docker on CentOS 7. We will be looking into CE )(Community Edition) Installation We will go over install using repositories yum install -y yum-utils device-mapper-persistent-data lvm2 yum-config-manager…

Installing and using LXC Containers on CentOS 7

LXC allows us to share Linux kernel to run application in something similar to chroot environment. Lets take a look at how to install and manage LXC on CentOS 7. Containers reside in /var/lib/lxc/ directory Installation yum install epel-release yum install debootstrap perl libvirt yum install lxc lxc-templates systemctl start lxc.service systemctl start libvirtd systemctl…

Setting up your own Monero mining pool with node-cryptonote-pool and Ubuntu 14

Feel free to use our Monero mining pool. mnrpool.tekyhost.com In this how to we will be setting up Monero mining pool with node-cryptonote-pool. We will be using Ubuntu-14.04 VPS running on VirtualBox Monero Monero first came around in April 2014. One of its main attractions is anonymity and security. Monero incorporates features into the cryptocurrency…

Install latest version of apache, mariadb and php on CentOS7

In one of out previous tutorials Install LAMP on CentOS we looked at installing LAMP on CentOS 7. Although this type if installation is fine for most of the deployments, in some cases you want to get the latest version of LAMP components. In most cases we will want to do this due to security…

Zimbra Domain Admin Delegation Open Source version 8.x and up

We were assigned a task of creating user account with access to only certain things. This can be done with this simple approach on Zimbra Open Source addition. 1. First create user admin_usr@domain.com for domain for which you want to grant delegation admin access. 2. We create admin_deleg.sh script in /opt/zimbra directory. The script should…