Run Selenium Code on Linux using headless Google Chrome and How Install Python 3.7 on Virtual Instance/Amazon EC2 when Python 2.7 already installed

Execute Selenium Code on Cloud Virtual Instance/Amazon EC2 and remove dependencies of Local physical Desktops - with same reference we 

Install Python 3.7 on Virtual Instance/Amazon EC2 when Python 2.7 already installed

Followed following high-level steps. 

1. Create free tier google Virtual Machine or Amazon EC2 Instance 
2. Make sure you can access same from your Windows Desktop/Laptop

Please refer

Document: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/putty.html 

Video: https://www.youtube.com/watch?v=bi7ow5NGC-U&ab_channel=LinuxAcademy 

Once able to access Cloud instance Please follow below steps. 

Check OS version 

OS version will help to search future references because if we execute Ubuntu commands on CentOS - it will not work 

For Example: APT vs Yum 

Please refer

Document: https://cmdref.net/os/linux/note/centos-vs-rhel 

For our case: we will use below command:

Execute below command/s:

cat /etc/os-release

Once OS confirmed as Centos  - Check Python is installed or not - By default many Linux virtual instance dependent on python and having python 2.7.5 preinstalled.  

Execute below command/s:

python -V or python --version (will give python version as 2.7.5)

Which Python will give location as /usr/bin

Now install python 3.7

Please do not install using - yum install -y python3 - It will install python 3.6*

Please refer: 

Document: https://tecadmin.net/install-python-3-7-on-centos/ 

Now Technical challenges starts 

python --version or python3 --version will not give required version 

Reason is, Default python path still link to Python2.7 

If you will search - Stackoverflow and everyone suggesting to move python location using below commands - 

Try adding 

Execute below command/s:

export PATH=$PATH:/usr/local/bin/python

This will help to make sure python 3 installed 

Execute below command/s:

python3.7 --version

Please do not execute below commands as yum will be stopped. 

mv /usr/bin/python2.7 /usr/bin/python_old

mv /usr/local/bin/python3.7 /usr/bin/python 

sudo ln -s python3.7 python

First Install PIP and required libraries

Execute below command/s:

Using YUM

sudo yum install epel-release

yum -y update

yum -y install python-pip

pip -V

or Using Curl

curl "https://bootstrap.pypa.io/get-pip.py" -o "get-pip.py"

sudo python get-pip.py

pip -V

Move requiremenet.txt on linux server

Sample requirment.txt (copy everything into notepad, save as requirement.txt)

Execute below command/s:

pip install -Ur requirement.txt

astroid==2.4.2

atomicwrites==1.4.0

attrs==20.3.0

cachetools==4.1.1

certifi==2020.11.8

chardet==3.0.4

colorama==0.4.4

dateutils==0.6.12

docutils==0.14

et-xmlfile==1.0.1

google-api-core==1.23.0

google-api-python-client==1.12.8

google-auth==1.23.0

google-auth-httplib2==0.0.4

google-auth-oauthlib==0.4.2

googleapis-common-protos==1.52.0

httplib2==0.18.1

idna==2.10

importlib-metadata==3.1.0

isort==4.3.21

jdcal==1.4.1

lazy-object-proxy==1.4.3

mccabe==0.6.1

more-itertools==8.6.0

multi-key-dict==2.0.3

numpy==1.19.4

oauth2client==4.1.3

oauthlib==3.1.0

openpyxl==3.0.5

pandas==1.1.4

pbr==5.5.1

pluggy==0.13.1

protobuf==3.14.0

py==1.9.0

pyasn1==0.4.8

pyasn1-modules==0.2.8

pylint==2.3.1

pyserial==3.4

pytest==4.4.0

pytest-html==1.17.0

pytest-metadata==1.11.0

pytest-ordering==0.6

pytest-parallel==0.0.5

python-dateutil==2.8.1

python-jenkins==1.0.0

pytz==2020.4

requests==2.25.0

requests-oauthlib==1.3.0

rsa==4.6

selenium==3.141.0

six==1.15.0

typed-ast==1.4.1

uritemplate==3.0.1

urllib3==1.26.2

wrapt==1.12.1

xlrd==1.2.0

zipp==3.4.0

Now you need to install google chrome and chrome driver on Linux

(As we are using putty) we will not able to launch Chrome and validate UI - we need to validate details using command - mainly Chrome Version: 

Execute below command/s:

wget https://dl.google.com/linux/direct/google-chrome-stable_current_x86_64.rpm

sudo yum localinstall google-chrome-stable_current_x86_64.rpm

yum info google-chrome-stable

You also need to install chromedriver:

Execute below command/s:

cd /home/seleniumtest (if folder not created, please create)

wget https://chromedriver.storage.googleapis.com/2.40/chromedriver_linux64.zip

unzip chromedriver_linux64.zip

This will unzip chromedriver into seleniumtest  folder

Setup is done so now we can switch to Python3.7.

Execute below command/s:

cd /usr/bin

ls -la | grep "python"

- it will display python2.7 and reference link or python or python2.7 folder with python name and no reference link

- if reference link python -> python2.7 available we need to remove

Execute below command/s:

sudo su

cd /usr/bin

ls -la | grep "python"

rm python (rm: remove symbolic link 'python' ?) will be displayed 

type: yes and press enter

ls -la | grep "python"

Symbolic reference link of python removed 

Execute below command/s:

mv /usr/bin/python2.7(Few might have folder as python) /usr/bin/python_old

mv /usr/local/bin/python3.7 /usr/bin/python 

sudo ln -s python3.7 python

Check python version

python --version - it should be 3.7

Now - Run Selenium Code on Linux using headless Google Chrome

cd /home/seleniumtest  (Same location where chromedriver downloaded)

vi abc.py

Press i and paste code 

from selenium import webdriver

from selenium.webdriver.chrome.options import Options

options = Options()

options.add_argument('--no-sandbox')

options.add_argument('--disable-dev-shm-usage')

options.add_argument('--headless')

options.add_argument('--disable-gpu')

driver = webdriver.Chrome(executable_path='./chromedriver', chrome_options=options)

driver.get('https://github.com/')

print(driver.title)

driver.quit()

type :wq to write and save abc.py

Execute: 

python abc.py 

Output - 

GitHub: Where the world builds software . Github 

Few errors which we resolved during this entire setup

Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/usr/lib/python2.7/site-packages/selenium/webdriver/chrome/webdriver.py", line 73, in __init__ self.service.start() File "/usr/lib/python2.7/site-packages/selenium/webdriver/common/service.py", line 98, in start self.assert_process_still_running() File "/usr/lib/python2.7/site-packages/selenium/webdriver/common/service.py", line 111, in assert_process_still_running % (self.path, return_code) selenium.common.exceptions.WebDriverException: Message: Service /bin/google-chrome unexpectedly exited. Status code was: 1

 Downloading packages: File "/usr/libexec/urlgrabber-ext-down", line 28 except OSError, e: ^ SyntaxError: invalid syntax File "/usr/libexec/urlgrabber-ext-down", line 28 except OSError, e: ^ SyntaxError: invalid syntax

 

import 'genericpath' # <_frozen_importlib_external.SourceFileLoader object at 0x7fe78c85ec10> import 'posixpath' # <_frozen_importlib_external.SourceFileLoader object at 0x7fe78c844dd0>

(Driver info: chromedriver=2.40.565383 ,platform=Linux 3.1

selenium.common.exceptions.WebDriverException:unknown error: DevToolsActivePort file doesn't exist