Using pytest to check ssh to multiple servers

Use case :  check ssh connectivity to multiple clusters in one test

#!/usr/bin/python import paramiko import pytest
@pytest.fixture(params=["ip1.ip1.ip1.ip1", "ip2.ip2.ip2.ip2"]) def ssh(request): ssh = paramiko.SSHClient() ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy()) ssh.connect(request.param,username="username",key_filename="connect.pem") yield ssh ssh.close() def test_hello(ssh): stdin, stdout, stderr = ssh.exec_command("echo hello") stdin.close() stderr.read() == b"" assert stdout.read() == b"hello\n"

run pytest in the terminal to test this.

to check plan of pytest run :

pytest --collect-only

Fixture does the setup of environment before we execute our test cases , in this case since there are multiple parameters , you can find more than one call for that method in the test plan.

To use a fixture in our method, just pass the method name in the function arguments

> pytest --collect-only
collected 2 items 
<Module Utility_test.py'>
  <Function 'test_hello[10.30.107.85]'>

  <Function 'test_hello[10.20.91.148]'>

Unable to install R packages rgl & qpcR in sparkR

If you encounter such an error while installing the package rgl in sparkR

configure: using libpng dynamic linkage checking for X... no 
configure: error: X11 not found but required, 
configure aborted.

its because X11 is a windows library and to resolve use:
Ubuntu : 

sudo apt-get install libglu1-mesa-dev

Redhat:

sudo yum install mesa-libGL-devel mesa-libGLU-devel libpng-devel