Ansible post install

ansible --version
ansible-playbook --version
ansible-galaxy --version

Now , we have the Ansible installed
Now we need the inventory
The inventory file needs to be managed by ansible

Every change to the inventory file should be able to be tracked


we can have this inventory file anywhere
Lets say that , the inventory file is in our home directory  by the name dev
The inventories are grouped by their function and the name of the Function being their role/Function

Now we know that their role/Function is what the group name is , it is easier to track the hosts in the Inventory

As we know the name of the file dev


executing this command

ansible --list-hosts all  , will check the list of the hosts from the Default system inventory which is
/etc/ansible/hosts

If we want to display the names of the hosts from a particular locaiton in the inventory , then we do tha following
We source in the name of the inventory file from the location where it is

ansible -i  filename  --list-hosts all

This will display the hosts that are in the filename

COMMANDS:
ansible --list-hosts all     and   ansible -i filename --list-hosts  all

Ansible Installation

yum install bind-utils

nslookup www.google.com

yum install htop

Installation Commands on Cent OS

  402  yum update
  403   yum -y install python-pip
  404  curl "https://bootstrap.pypa.io/get-pip.py" -o "get-pip.py"
  405   yum -y install python-pip
  406  python get-pip.py
  407  pip -V
  408  id
  409  pwd
  410  docker ps
  411  docker ps -a
  412  id
  413  pwd
  414  pip -V
  415  id
  416  su -
  417  cd
  418  hostname
  419  docker ps
  420  docker ps -a
  421  pip -V
  422  yum install ansible
  423  yum update
  424  which ansible
  425  yum install ansible
  426  sudo apt-get update
  427  sudo yum update
  428  id
  429  su -
  430  id
  431  pwd
  432  bash
  433  bash
  434  docker ps
  435  pwd
  436  cd docker
  437  ls
  438  ls -ltra
  439  cd ..
  440  pwd
  441  cd python
  442  ls
  443  ls -ltra
  444  more getCpu_count.py
  445  ls
  446  id
  447  pwd
  448  ansible
  449  ansible -v
  450  ulimit -a
  451  ulimit
  452  sudo launchctl limit maxfiles unlimited
  453  launchctl
  454  launch
  455  ulimit
  456  ulimit -help
  457  ulimit -maxfiles
  458  ulimit - maxfiles
  459  ulimit
  460  ulimit -a
  461  pwd
  462  cd ..
  463  ls
  464  mkdir ansible
  465  cd ansible/
  466  git clone git://github.com/ansible/ansible.git --recursive
  467  id
  468  su -
  469  cd /opt
  470  docker ps
  471  id
  472  pwd
  473  cd /opt/apps
  474  ls
  475  bash
  476  bash
  477  pwd
  478  ls
  479  cd
  480  ls
  481  hostname
  482  pwd
  483  ls
  484  cd
  485  cd /opt/apps
  486  ls
  487  cd ansible/
  488  ls
  489  cd ansible/
  490  ls
  491  cd ..
  492  ls
  493  pwd
  494  ls
  495  git clone git://github.com/ansible/ansible.git --recursive
  496  mv ansible/ ansible.o
  497  git clone git://github.com/ansible/ansible.git --recursive
  498  ifconfig -a | grep inet
  499  ifconfig -a
  500  id
  501  pwd
  502  nslookup
  503  which nslookup
  504  yum install nslookup
  505  id
  506  pwd
  507  id
  508  pwd
  509  nslookup dns
  510  nslookup dns.example.com
  511  cd /etc/
  512  vi resolv.conf
  513  pwd
  514  ls
  515  ls 0ltra
  516  ls -ltra
  517  ls -ltra | resolv.conf
  518  ls -ltra resolv.conf
  519  date
  520  which ansible
  521  history
  522  pwd
  523  cd /var/tmp
  524  history > history_file

Ansible Tut1

The Following are the steps , that we need to follow to install ansible on OSX

1) Check ulimit -n
They should be unlimited

2) sudo easy_install pip
pip gets installed , which is a package manager

3) Ansible is a python Application
Packages available through package repo

4)sudo pip install ansible
Now Install ANSIBLE  using pip , which is a python package manager

5) Ansible uses Native OPEN SSH for communication

6) Using Open SSH enables Control Persist - which is a performance feature , Kerberos and options in ~/.ssh/config  such as Jump Host setup