Kubernetes volume hostPath explained with examples
The hostPath volume mounts a resource from the host node filesystem. the resources could be directory, file socket, character, or block device. These resources mu A hostPath volume mounts a…
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Kubernetes volume emptyDir explained with examples
Here are the following facts for emptyDir storage type in Kubernetes An emptyDir volume is first created when a Pod is assigned to a Node and initially its empty A…
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Working with multiple virtual Kubernetes clusters aka Namespaces
Kubernetes supports multiple virtual clusters backed by the same physical cluster. These virtual clusters are called namespaces. Namespaces ca be used in multiple environment with many users spread across multiple…
Read more »minikube error – VBoxManage.exe: error: DHCP server already exists
Error Message Solutions minikube stop minikube start
Read more »minikube error – CrashLoopBackOff: secrets is forbidden: User “system:serviceaccount:kube-system:default”
$ minikube dashboard Temporary Error: unexpected response code: 503 Temporary Error: unexpected response code: 503 Temporary Error: unexpected response code: 503 Temporary Error: unexpected response code: 503 Solution
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How to check Containers readiness inside a pod using readinessProbe?
A Probe is a diagnostic performed periodically by the kubelet on a Container. To perform a diagnostic, the kubelet calls a Handler implemented by the Container. There are three types…
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How to check Containers health inside a kubernetes pod using livenessProbe?
A Probe is a diagnostic performed periodically by the kubelet on a Container. To perform a diagnostic, the kubelet calls a Handler implemented by the Container. There are three types…
Read more »How to enable Elastic Search REST API Accessible using IP Address?
By default http transport and internal elasticsearch transport only listens to localhost. If you want to access Elasticsearch from the host other than localhost then try adding following configurations in…
Read more »Ansible Playbook Lab & Excercise – Part 7
Create a playbook where you should install a webserver into 2 OS type(Ubuntu and RHEL) with fact conditioning. and list out a directory which in “/etc” and display such as…
Read more »Ansible Windows Playbook Lab & Excercise – Part 8
Write a playbook to Create a dir, named with your-name inside C:\HPE and create a file named with “readme.txt” inside “C:\HPE\ and content of the file should be “I love…
Read more »Ansible Windows Adhoc Commands Lab & Excercise – Part 2
Write a Adhoc command to Create a dir, named with your-name inside C:\HPE and create a file named with “readme.txt” inside “C:\HPE\ and content of the file should be “I…
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How to install Ansible in Centos 7/RHEL 7?
How to install Ansible in Centos 7/RHEL 7? Install Ansible via Pip in RHEL/CENTOS
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Kibana 7.2 Install and configuration in RHEL 7/Centos
Install and Setup JDK 8+ Download and Install Kibana 7.X Configure Kibana 7.X How to start kibana service?
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How to use elastic search EC2 discovery plugin?
Problem To increase the performance in Elasticsearch, many times we add new nodes to Elasticsearch cluster and manually change the configuration file with new IP address, etc. so that it…
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Elastic Search Error – Node is started with node.data=false, but has shard data
[2019-07-11T09:59:18,013][ERROR][o.e.b.Bootstrap ] [es-master01] Exception java.lang.IllegalStateException: Node is started with node.data=false, but has shard data: [/home/ec2-user/elasticsearch-7.2.0/data/nodes/0/indices/6XsNftnbSbOnzPK3wOKc 0w/0]. Use ‘elasticsearch-node repurpose’ tool to clean up at org.elasticsearch.env.NodeEnvironment.ensureNoShardData(NodeEnvironment.java:1065) ~[elasticsearch-7.2.0.jar:7.2.0] at org.elasticsearch.env.NodeEnvironment.(NodeEnvironment.java:324) ~[elasticsearch-7.2.0.jar:7.2.0] Solution
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Elastic Search Error – max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]
Errors [2]: max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144] Solution To make it persistent, you can add this line: $ sudo vi /etc/sysctl.conf…
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Elastic Search Error – max file descriptors [4096] for elasticsearch process is too low, increase to at least [65535]
Elastic Search Error – max file descriptors [4096] for elasticsearch process is too low, increase to at least [65535] Solution Temporary to the current login session To set ulimit value…
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How to create sample data to perform searches using elastic search?
Step 1 – Go to: http://www.json-generator.com/ Step 2 – Download and save as customers_full.json Step 3 – Open customers_full.json in sublimetext Remove the array brackets Find-Replace },{ with }\n{ in…
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What is difference between application/x-ndjson and application/json?
Lets understand what is json? JSON stands for JavaScript Object Notation JSON is a lightweight format for storing and transporting data JSON is often used when data is sent from…
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Elastic Search Error – The bulk request must be terminated by a newline
FIX – Add a New line in customers_full.json
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ElasticSearch Error – illegal_argument_exception – Rejecting mapping update to type
########### COMMAND ################# ########### OUTPUT ########### Solution Multiple mapping types are not supported in indices created in 6.0 The ability to have multiple mapping types per index has been removed…
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ElasticSearch Error – Content-Type header [application/x-www-form-urlencoded] is not supported
To fix this, add curl option -H ‘Content-Type: application/json’. This error is due to strict content-type checking introduced in ElasticSearch 6.0 Solution
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Understading Octopus Deploy Backup and restore process
Your Master Key When an Octopus Server is installed, we generate a special key used for encryption, called the master key. The master key is then encrypted asymmetrically, using DPAPI,…
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Prevent direct download of photos/video files from amazon s3
You can restrict access based on the HTTP referrer. It’s not bulletproof (Referrer can be spoofed) but it will stop casual downloads. Suppose you have a website with domain name…
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Ansible Include and Import with differences explanined!
This is one of the most frequest questions being asked in my workshop is that differences between using import or include in Ansible. For example import_role or include_role, what should…
Read more »Order of operations during Ansible playbook parsing explained!
We will delve into some specifics of how a playbook is parsed for Order of operations. Ansible can be assumed to be executed in a top to bottom order; that…
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Ansible Variable: How can I pass variable to ansible playbook in the command line?
It is possible to set variables at the command line using the –extra-vars (or -e) argument. Variables can be defined using a single quoted string (containing one or more variables)…
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