debian

How to run JupyterHub in docker swarm environment using swarmSpawner.

I had a request in these days where I was asked to run JupyterHub in a docker environment. To be able to provide horizontal scaling to the platform taking in

debian

Setup docker swarm cluster

Setting up a swarm cluster is really easy. All you need is a minimum of two nodes with OS of your choosing and having docker-ce installed on them both. Since

elasticsearch

Managing your elasticsearch indices with curator

If you are monitoring your environment using beats the default action is to rotate the indices every day and create new indices at midnight. After some time your disk will start filling up and it is very hard to see what you want to

swap

Creating swap file on your filesystem

Some times you just need more memory in your system that you physically have. You don't know what to do but you cannot add more memory for various reasons. Filesystem is always there is it has more space than you could need in memory

VPN

Create an ipsec VPN tunnel between GCE network and AWS network

Recently I got a task to link the AWS network with the GCE network so that the traffic between the two networks would be going via an encrypted and secured tunnel without accessing the public network. For this you will need a GCE account.

elasticsearch

How to create your own in house elasticsearch alerts.

Since I am using elasticsearch for getting server side healthchecks, statistics and check on services which are important for the blog to function, I was wondering if I can use elasticsearch to write my own alerts in case something goes down. Therefore I have

kibana

Putting Kibana behind haproxy as /kibana and enable simple http authentication.

In this post we will talk about why and how to put kibana behind haproxy. First thing I am thinking is to be able to have multiple kibana setups and either do loadbalancing between them or use them as active - backup setup. This

jessie

Create percona xtradb cluster using rkt containers on multiple hosts over flannel overlay network

Since the new technologies are using containers I have decided to give rkt a try to see what it can do. Rkt is developed by CoreOs and was announced in 2014. It got alot of attention in February 2016 when it was released version

elasticsearch

Recovering unassigned shards on elasticsearch 2.x

I got accross the problem when decided to add a node to the elasticsearch cluster and that node was not able to replicate the indexes of the cluster. This issue is usually happens when there is not enough disk space available, or not available

logstash

Logstash using dissect instead of grok for filtering

Some time a go I've came across the dissect filter for logstash to extract data from my access_logs before I hand it over to elasticsearch. Dissect is a different type of filter than grok since it does not use regex, but it's an

elasticsearch

How to create snapshot and restore snapshot with elasticsearch

In this post we will show you how to create snapshots and restore those snapshots with ElasticSearch easily. This is a very easy method if you want to migrate your current elasticsearch cluster to a new version, which cannot be performed on major upgrades,

ansible

How to install Ansible and use it to upgade a server.

For this tutorial we will install Ansible 2 on debian jessie. In order to install the latest version of ansible on debian jessie we will need to compile it from source since the official debian repositories does not support Ansible 2.x yet. Therefore

elasticsearch 2.x

Configure elasticsearch logstash filebeats with shield to monitor nginx access.log

In this post I will show how to install and configure elasticsearch for authentication with shield and configure logstash to get the nginx logs via filebeat and send it to elasticsearch. Why we do need filebeat when we have packetbeat? It is a good

debian

Loadbalance your website with haproxy and varnish

In this post will show how to install haproxy and varnish. The setup will have haproxy as frontend and varnish will be between haproxy and the nodes. Why not use varnish as a frontend? Because in case you would like to use https varnish

fedora

Monitor your servers with Elasticsearch 2.x and Beats and display it in Kibana

In this post we will cover the installation and configuration of elasticsearch 2.x, and configure packetbeat and topbeat for monitoring web services databases and server load. After all these are set up we will be using Kibana to show the data in a

debian

Compile a kernel on Debian

From time to time you need to add some modules in the kernel which are not compiled in by default. To achieve that you need to compile your kernel. In this post we will go over the steps you need to take to compile

DigitalOcean

Why DigitalOcean Floating IP is fake?

DigitalOcean has recently introduced a high availability solution called floating IP - In my own review is think its one of the most LAME solutions DO has introduced - Background : Basically they allow you to assign a public IPv4 IP to be a floating

elasticsearch

Setup and configure elasticsearch, logstash, logstash-forwarder and kibana on debian jessie

INTRODUCTION## This is the first part of a series of tutorials on how to install configure and setup elasticsearch, logstash and kibana on debian jessie using VPSie SSD VPS service. Elastic as the company behind the three opensource projects - Elasticsearch, Logstash, and Kibana

mariadb

Reset mysql root password

This post is about how to reset your mysql root password if you cannot recall it and you have lost it forever. First thing first you need to make sure that your mysql server is turned off. This can be done by the following

VPSie

Side by Side review between automated SSD VPS providers DigitalOcean, Vultr and VPSie

This post will be a review of the three major VPS providers, which are DigitalOcean, Vultr and VPSie. Since it is pretty hard to decide where you want to go when you decice to choose a SSD based VPS provider, I have decided to

mysql password

Secure your website with DANE (DNS-based Authentication of Named Entities)

In our days just having your website running on SSL seam to not be enough since the attack on march 11 2014 on Comodo Group and Diginotar showed us that the simple trust is not justified. You can never know that your if your

mysql password

Install postfix + dovecot auth + tls + mysql + postfixadmin + postgrey + spamassassin and clamav on Centos 7

In this post we will install a mail server using virtual users with authentication using dovecot and ssl. After we are able to successfully send and retrieve e-mails we will securing the server with postgrey, spamassassin and clamav antivirus. We will be using in

Ghost

Installing Ghost on debian + nginx + forever

This is my first Blog ever therefore please do not judge me for any mistake I would not know about the blogging world. Let's just jump into the middle of it. Where I want to get to? Easy answer: I want to have Ghost

virtual machines

Add space to a LVM partition on virtual machine running linux operating system without restart

There are many solutions which are running on virtual machines no matter of what kind (vmware, kvm, xen etc). I will assum that the disk you add is a scsi disk. Ones you have added the disk to the running linux operating system on

Ghost

Running ghost with pm2 and nginx

For the installation of the node.js, ghost on a linux operating system you can look at this post. Assumptions: Linux operating system is installed and running, node.js and ghost is running on your system. You have full root access. Navigate to your