Currently reading articles under label: backend-and-server

Scala the Language

Install Sbt

echo "deb https://dl.bintray.com/sbt/debian /" | sudo tee -a /etc/apt/sources.list.d/sbt.list

sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv 2EE0EA64E40A89B84B2DF73499E82A75642AC823

sudo apt-get update

sudo apt-get install sbt

ref: scala-sbt.org (v1.0)

Com......

Kubernetes (k8s)

Install Single-Node for Test

nix

# server

curl -LO https://storage.googleapis.com/minikube/releases/latest/minikube-linux-amd64 && sudo install minikube-linux-amd64 /usr/local/bin/minikube

minikube start

# client, via snap (snap will NOT work in Docker-like containers)

sudo snap install k......

GRUB Rescue

When being forced into GRUB rescue mode, run ls and ls <one_partition> to check available partitions and find the one that we should boot from [ref].

Then set prefix & root[ref]:

set root=(hdX,Y)

set prefix=(hdX,Y)/boot/grub

insmod n......

Python Code Cookbook

See also:

Learning Python, the Language

Pandas

Get column_nr in pandas/numpy.

if isinstance(X, pd.DataFrame):

X_is_df = True

row_nr = X.shape[0]

column_nr = X.shape[1]

if isinstance(X.columns, pd.core.index.MultiIndex):

df_columns_is_multi_index = True

else:

......

Python Code Reuse

execfile or os.system

execute the other python file in place:

execfile("/path/to/my/lib/mylib.py")

or:

import os

os.system("python /path/to/my/lib/mylib.py")

import

import sys

import os

sys.path.append(os.path.abspath("/path/to/my/lib"))

import mylib

ref

See ot......

Steps to Check Netwok Interface Card (NIC) Configurations

Check the physical NIC is connected.

lspci

Note: The NIC will be shown regardless if drivers are installed, this is a PCI feature. Ref.

Then check if it is recognized as network interfaces:

ifconfig -a

Check if it is up:

ifconfig