DAY12.md

Day 12

command sed find and replace

command awk print clumn from a file

command vi /etc/selinux/config

Ansible

• its a automation tool

• ansible use ssh key pair for automating a linux server

• ansible use Api for connecting with aws

• ansible use ssh for connecting with network(cisco)

• ansible use Api(go) for connecting with docker

• ansible winRm for windows

• note:- ansible doesnt install on windows

• language python

about ansible

• vim /etc/ansible/hosts its stores inventory file that containe the ip address of remote machine that we want to access.

steps

1. pick two machine (two os) aws
2. os1 install ansible(yum install ansible)for red hat 3. sudo apt install ansible in ubuntu 18.04
3. Assign password to ec2-user(passwd) in os2
4. chang /etc/ssh/sshd-config to accept password in os2 and restart sshd service

• ansible -u ec2-uer -m ping -k-k ask passwd

• Change in OS2 /etc/ssh/sshd_config to accept Password in OS2

• Line 65: PASSWORD_AUTHENTICATION = YES

• Restart the sshd service

• systemctl restart sshd

• Add IP address in the hosts file of ansible /etc/ansible/hosts

[a]
13.234.48.87
inside inventory file

• Run the command this will run group a of the host file ansible a -u ec2-user -m ping -k
• -u is for defining the username
• -m is used for importing a python module and here we are using ping
• -k is used for defining SSH Passwor

Python (Network Security)

• RSA,DSA,ECDSA these are the algorithms that use in network security