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DAY13_akshay_bhaiya.md

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Day 13

  • Connect to OS1 and OS2.
  • Set the sshd to turn on password authentication
  • Now restart the service sshd
  • and now try to connect to OS2 using OS1 using this command
ssh [email protected] cal
  • We can also switch the order of module and key
ansible a -u ec2-user -k -m command -a "date"
  • Idempotency is used to check weather a software is installed or not
  • Shell module is used to execute shell commands
  • -a is for argument of a module
ansible a -u ec2-user -k -m yum -a "name=httpd state=present"
  • yum module takes name of the software using name varibale and state to install the software.
ansible localhost -m yum -a "name=httpd state=present"
  • Service module is used to check or start a service.
ansible localhost -m service -a "name=httpd state=started"
  • To copy a file we use copy module.
  • src is used to specify where is the file in your base machine
  • dest is used to specify where to put file in your destination machines.
ansible localhost -m copy -a "src=index.html dest=/var/www/html"
  • Since to do every task with specifying a command we can also use a playbook to specify all the commands.
  • To write playbook in Ansible we use yaml file yet another markup language
  • Yaml programming language contains 3 components.
    • Target (Group)
    • Variable (Optional)
    • Tasks (Module)
  • Playbook language
 - hosts:  localhost # This is target
   tasks:
    - command: date
    - shell: cal
    - yum: name=httpd state=present
  • To check syntax error use this
ansible-playbook first.yaml --syntax-check
  • To run the playbook use the command
playbooks]# ansible-playbook first.yaml

---
 - hosts: a # This is target
   remote_user: ec2-user
   tasks:
    - command: date
    - shell: cal
    - yum: name=httpd state=present
  • To give a name or desciption specified for the command use - name
---
 - hosts: localhost # This is target
   tasks:
    - name: running date command
      command: date
    - name: install httpd software
      yum: name=httpd state=installed
  • To learn more about a module use this command
ansible-doc yum
  • You can also write your anible code like this, this is a new format.
---
 - hosts: localhost # This is target
   tasks:
    - name: running date command
      command: date
    - name: install httpd software
      yum:
       name=httpd
       state=installed
  • To know how many modules are there in ansible
ansible-doc -l
  • To count number of packages just by number you can use pipe and wc
ansible-doc -l | wc -l

Python Class

  • Functions are used to reuse code.
  • To create a function we use the keyword def
  • To call a function we write the function name with ()
  • For more information about functions click here