Linux Tweaks

Monday, January 13, 2020

kubernetes - how to local load balancer

Pre-requirements:

Docker desktop installed.
Kubernetes enabled
Some services already created and running:

kubectl.exe get all
NAME READY STATUS RESTARTS AGE
pod/httpenv-dd7475946-69wj8 1/1 Running 0 15h
pod/httpenv-dd7475946-6ncsb 1/1 Running 0 15h
pod/httpenv-dd7475946-cf46s 1/1 Running 0 15h
pod/httpenv-dd7475946-lclml 1/1 Running 0 15h pod/httpenv-dd7475946-nv4br 1/1 Running 0 15h
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
service/httpenv ClusterIP 10.111.175.59 <none> 8888/TCP 15h

NAME READY UP-TO-DATE AVAILABLE AGE
deployment.apps/httpenv 5/5 5 5 15h

NAME DESIRED CURRENT READY AGE
replicaset.apps/httpenv-dd7475946 5 5 5 15h

Create LoadBalancer:

Create LoadBalancer as following

kubectl.exe expose deployment.apps/httpenv --port 8888 --name httpenv-lb --type LoadBalancer
service/httpenv-lb exposed

Check the load balancer created

kubectl.exe get service
NAME TYPE           CLUSTER-IP EXTERNAL-IP PORT(S) AGE
httpenv ClusterIP 10.111.175.59 <none> 8888/TCP 15h
httpenv-lb LoadBalancer 10.102.229.139 localhost 8888:31050/TCP 28s

Test

curl localhost:8888
{"HOME":"/root","HOSTNAME":"httpenv-dd7475946-cf46s","KUBERNETES_PORT":"tcp://10.96.0.1:443","KUBERNETES_PORT_443_TCP":"tcp://10.96.0.1:443","KUBERNETES_PORT_443_TCP_ADDR":"10.96.0.1","KUBERNETES_PORT_443_TCP_PORT":"443","KUBERNETES_PORT_
443_TCP_PROTO":"tcp","KUBERNETES_SERVICE_HOST":"10.96.0.1","KUBERNETES_SERVICE_PORT":"443","KUBERNETES_SERVICE_PORT_HTTPS":"443","NGINX_HTTP_PORT":"tcp://10.101.186.145:8083","NGINX_HTTP_PORT_8083_TCP":"tcp://10.101.186.145:8083","NGINX_H
TTP_PORT_8083_TCP_ADDR":"10.101.186.145","NGINX_HTTP_PORT_8083_TCP_PORT":"8083","NGINX_HTTP_PORT_8083_TCP_PROTO":"tcp","NGINX_HTTP_SERVICE_HOST":"10.101.186.145","NGINX_HTTP_SERVICE_PORT":"8083","PATH":"/usr/local/sbin:/usr/local/bin:/usr
/sbin:/usr/bin:/sbin:/bin"}

Wednesday, October 30, 2019

Wordpress error 504 - hot to troubleshoot and fix

1. In the wordpress root directory, greate file info.php with following php code
<?php phpinfo(); >
2.Access this file
http://[web site]/info.php
if the page loaded but wordpress still response with 504 move to next step. if not - try to restart php service and apace or Nginx
3. Enable debug mode in wp-config.php
define('WP_DEBUG', true);
try to access website and follow the errors to try to understand what caused it. if still 504 error without explanation, move to next step
4. Start to disable instaled plugins one by one. First, set the order of installed plugins by date.
Very likely one of last installed plugins cause that error

in my case, paid-memberships-pro cause the error.

Monday, April 15, 2019

How to easily store and transfer TRAT digital currency with medooza crypto wallet

Following is simple steps to store ,manage and transfer TRAT digital currency .

Sign up to medooza wallet https://wallet.medooza.network - this wallet is secure , since no privet keys stored on that wallet.This means You need to keep keys at your own secure place:
Now , go to "add wallet"
In the search box type TRAT
Create Your TRAT wallet
Provide password to protect You wallet transactions
Write or print your recovery phrase and store it securely offline.
Fill previously saved phrase and create
Congratulation ! You can start to use TRAT wallet

Tuesday, January 29, 2019

Following is simple steps to store ,manage and transfer WAX Token.

Sign up to medooza wallet https://wallet.medooza.network - this wallet is secure , since no privet keys stored on that wallet.This means You need to keep keys at your own secure place:
Now , go to "add wallet"
Then "create custom ERC20token"
According to Wax the contract address is:0x39bb259f66e1c59d5abef88375979b4d20d98022 , copy paste the contract address , if all valid , You will see all other fields filed automatically with all relevant data
Now , you can import you own or create new one, send or receive foodcoin with medooza wallet.
Simple , fast , secure.