nisanth
Thu Apr 25 2024
The
Example Explanation
#devops #docker
docker stats
command is a powerful tool provided by Docker to monitor the resource usage of running containers. It provides a real-time stream of various metrics such as CPU usage, memory usage, network I/O, block I/O, and the number of processes (PIDs) running inside each container. This command is particularly useful for performance analysis and ensuring that containers are running within their resource limits.Example Explanation
docker stats db370fc6b784
CONTAINER ID NAME CPU % MEM USAGE / LIMIT MEM % NET I/O BLOCK I/O PIDS
db370fc6b784 minikube 43.70% 1.243GiB / 2.148GiB 57.87% 35.4MB / 414MB
#devops #docker
Vaibhav Yadav
Wed Apr 24 2024
We can check the default value for a given column using postgres query like this:
Same can be used for constraints like
#database #postgres #query
SELECT column_name, column_default
FROM information_schema.columns
WHERE table_name = '<table_name_placeholder>' AND column_name = '<column_name_placeholder>';
Same can be used for constraints like
is_nullable
as following:
SELECT column_name, is_nullable
FROM information_schema.columns
WHERE table_name = '<table_name_placeholder>' AND column_name = '<column_name_placeholder>';
#database #postgres #query
Sujay Prabhu
Tue Apr 23 2024
active_record_doctor
performs variety of health checks to identify and rectify common database issues like missing foreign key constraints, missing NON NULL constraints, missing presence validations, incorrect presence validations on boolean columns and many more. Ref: https://github.com/gregnavis/active_record_doctor#rails #database
sagar.ghorse
Mon Apr 22 2024
while integrating
#devops #sentry#gitlab
sentry
with gitlab
ip whitelisting needs to be done on gitlab server (self-hosted)#devops #sentry#gitlab
soniya.rayabagi
Mon Apr 22 2024
The
#devops #kubernetes
kubectl cordon NODE_NAME
command is used in Kubernetes to mark a node as unschedulable
, meaning no new pods will be scheduled onto that node. Existing pods on the node will continue to run unless explicitly terminated or moved.#devops #kubernetes
nisanth
Mon Apr 22 2024
Debugging Kubernetes pod on helm
Adding
#devops #kubernetes #helm
helm upgrade unleash-app-toggle . --debug
Adding
--debug
can provide more insight if the error persists, showing exactly what values are being passed to each template.#devops #kubernetes #helm
nisanth
Fri Apr 19 2024
Avoid Using Double Quotes for Environment Variables
When configuring the PostgreSQL user and database names in a Helm values.yaml file, I initially wrapped the values in double quotes. This led to a frustrating issue where I couldn’t connect to the database, receiving errors that the role did not exist. The double quotes were being interpreted literally, causing mismatches in authentication.
Solution: I removed the double quotes around the environment variables in my Helm chart and reapplied the configuration. This corrected the problem, and I was then able to connect successfully to the database.
#devops #postgres #env
When configuring the PostgreSQL user and database names in a Helm values.yaml file, I initially wrapped the values in double quotes. This led to a frustrating issue where I couldn’t connect to the database, receiving errors that the role did not exist. The double quotes were being interpreted literally, causing mismatches in authentication.
Solution: I removed the double quotes around the environment variables in my Helm chart and reapplied the configuration. This corrected the problem, and I was then able to connect successfully to the database.
#devops #postgres #env
sagar.ghorse
Thu Apr 18 2024
create the redis cluster from existing backup we can use
#devops #redis #Terraform
snapshot_name = <name of your backyp >
#devops #redis #Terraform
nisanth
Wed Apr 17 2024
To find the number of pods that exist in the “dev” environment (env), you can use the
#devops #kubernetes
kubectl get pods --selector=env=dev
#devops #kubernetes
Sachin Kabadi
Tue Apr 16 2024
#nextJs #TypeScript
In the above example:
• We have a component MyComponent with a state variable count and a button to increment it.
• Inside the component, we use the useEffect hook to update the document title with the current count after each render.
• We pass [count] as the second argument to useEffect, which means the effect will only run when the count state changes. This is because we want to update the document title only when the count changes, not on every render.
useEffect
is a hook that allows you to perform side effects in function components.
import React, { useState, useEffect } from 'react';
function MyComponent() {
const [count, setCount] = useState(0);
// This effect will run only when the count state changes
useEffect(() => {
document.title = `You clicked ${count} times`;
}, [count]); // Only re-runs when count changes
return (
<div>
<p>You clicked {count} times</p>
<button onClick={() => setCount(count + 1)}>
Click me
</button>
</div>
);
}
export default MyComponent;
In the above example:
• We have a component MyComponent with a state variable count and a button to increment it.
• Inside the component, we use the useEffect hook to update the document title with the current count after each render.
• We pass [count] as the second argument to useEffect, which means the effect will only run when the count state changes. This is because we want to update the document title only when the count changes, not on every render.
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