velp / OVN.md

Created October 14, 2025 18:28 — forked from odivlad/OVN.md

OVN cheat sheet

Manpages

Architecture:

man ovn-architecture

OVN_Northbound:

velp / architecture.md

Last active October 18, 2025 12:47

OVN Troubleshooting

OVN Architecture

velp / openstack-commands.md

Last active January 17, 2024 15:16

openstack-commands.md

Check all Floating IP by open TCP ports in Security Groups

openstack floating ip list -f value | while read fip; do echo -e "\e[32m===> Check IP $(echo $fip | awk '{print $2}')\e[0m"; openstack port show $(echo $fip | awk '{print $4}') -c security_group_ids -f json | jq '.security_group_ids[]' -r | while read sg; do openstack security group rule list $sg --ingress --protocol tcp --ethertype IPv4 -c "Port Range" -f value | while read ports; do nc -nzv -w2 $(echo $fip | awk '{print $2}') $(echo $ports | sed 's/:.*//g') ; done; done ; done

velp / http_debug.md

Created February 11, 2021 15:04

Go HTTP client debug requests/responses

Add logging round tripper:

import (
	"fmt"
	"net/http"
	"net/http/httputil"
)

// This type implements the http.RoundTripper interface.

velp / log_colorized.md

Last active January 28, 2021 11:43

OpenStack log colorized

It helps to analize OpenStack logs, example

Create sed rules file:

cat > /tmp/log_colorized.sed <<EOL
s/(INFO.*)/\x1B[32m\1\x1B[0m/
s/(ERROR.*)/\x1B[31m\1\x1B[0m/
s/(WARNING.*)/\x1B[33m\1\x1B[0m/
s/(CRITICAL.*)/\x1B[31m\1\x1B[0m/

velp / README.md

Last active January 31, 2025 18:02

Run minikube with cilium CNI for test

System requirements:

OS: ubuntu 18.04+
CPU: 6+
RAM: 10+ Gb

Install minikube + cilium

# Run OS preparation
curl -s https://gist.githubusercontent.com/velp/151636fe01d8b8e3f9c626b30e3c2bc5/raw/prepare_system.sh | bash -s --

velp / runme_dockerfile.md

Last active April 22, 2020 08:18

How to add Dockerfile and test it locally

Step 1: check/create Dockerfile in root

Your repository should have Dockerfile in the root directory. Specification of Dockerfile you can find here: https://docs.docker.com/engine/reference/builder/

For Node.JS application it can be something like this:

FROM node:12.10.0

# Create directory where we will place the application
WORKDIR /usr/src/app

velp / golang_snippets.md

Last active April 20, 2020 12:11

Goalng code snippets

YAML parse string/array in one field and parse string/map in one field

import (
    "fmt"
    "strconv"
    "strings"
    "gopkg.in/yaml.v2"
)

velp / jexia_sdk_consumption_example.md

Last active April 5, 2020 12:35

How to use Jexia SDK for consumption API

Install jexia-sdk

pip install jexia-sdk

Example:

from jexia_sdk.http import HTTPClient

JEXIA_PROJECT_ID = '<PROJECT_HERE>'

velp / jexia_apphosting_curl.md

Created April 3, 2020 10:33

How to use Jexia application hosting via CURL

Step 1: set credentials

export JEXIA_EMAIL="<HERE_YOUR_EMAIL>"
export JEXIA_PASSWORD="<HERE_YOUR_PASSWORD>"
export JEXIA_PROJECT="<HERE_YOUR_PROJECT>"

Vadim Ponomarev velp