minikube error – VBoxManage.exe: error: DHCP server already exists
Error Message Solutions minikube stop minikube start Rajesh KumarI’m a DevOps/SRE/DevSecOps/Cloud Expert passionate about sharing knowledge and experiences. I have worked at Cotocus. I share tech blog at DevOps School,…
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 Rajesh KumarI’m…
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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 Rajesh KumarI’m a DevOps/SRE/DevSecOps/Cloud Expert passionate about sharing knowledge and experiences. I have worked at Cotocus….
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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? Rajesh KumarI’m a DevOps/SRE/DevSecOps/Cloud Expert passionate about sharing knowledge and experiences. I…
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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 Rajesh KumarI’m a DevOps/SRE/DevSecOps/Cloud Expert passionate about sharing knowledge and experiences. I have worked at Cotocus. I share tech blog at DevOps…
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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 Rajesh KumarI’m a DevOps/SRE/DevSecOps/Cloud Expert passionate about sharing…
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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 »Understanding Ansible Architecture using diagram
What is Ansible? Rajesh KumarI’m a DevOps/SRE/DevSecOps/Cloud Expert passionate about sharing knowledge and experiences. I have worked at Cotocus. I share tech blog at DevOps School, travel stories at Holiday…
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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How to specifying multiple groups in a playbook hosts specification?
By design, Ansible executes just one play at a time. Your playbook consists of two plays (the two items in the root-level YAML list defined by the playbook file). Method…
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Octopus deploy Package Deployment Feature Ordering
When Octopus deploys packages, it runs a series of actions implementing the conventions or features enabled for that step. The order of evaluation once the package is extracted is: BeforePreDeploy.*…
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Difference between ansible vars_files vs include_vars
Both of them have some commonalities but they solve different purposes. vars_files are read when the play starts. include_vars are read when the play reaches the task. Format vars_files: directive…
Read more »Configuration Transforms in Octopus Deploy explained!
Before understanding “Configuration Transforms” in octopus deploy, lets understand what is “Web.config Transformation” in visual studio. What is Web.config? Web.config is an application configuration file of The Official Microsoft ASP.NET…
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How to create a Nuget Package using NuGet Package Explorer?
What is NuGet Package Explorer? NuGet Package Explorer (NPE) is an application that makes it easy to create and explore NuGet packages. You can load a .nupkg or .snupkg file…
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