Create 3 ubuntu instances
Connect to server1
Ubuntu machine default comes with python 3
But we need pytho 2
Update apt repository
Sudo apt-get update
Install python2
Sudo apt-get install -y python2.7 python-pip
Establish password less connection between controller and managing
nodes(server1 and server2)
Sudo passwd ubuntu (give password as ubuntu)
Sudo vim /etc/ssh/sshd_config
Change password authentication to yes
Save and quit
Restart the service
Sudo service ssh restart
Exit
Same procerdure to follow server 2
Now connected to controller
Update the repository
Sudo apt-get update
Install python 2
Generate the keys
Ssh-keygen
Controller machine open
vim .ssh/id_rsa.pub
ssh-rsa
AAAAB3NzaC1yc2EAAAADAQABAAABgQC2e11Eb8j9N56h2QIcfca3ce+o0II+er+YIjhVFw4ZK
pUvOX3tZbFY2eOPIc8YB3d2gJQWHQIa+43eO/
grfseFC3O1DPJUIovxNwLbxRkhxqzKxSGZ8dGx1WfAXzpUNmX7OB4+jWOauTqqoDDgsb+Qw
wcDumnsYsmFW43DZu7rfRXCo9rex1X5wlO2oOHea/
YY0FXNHu9BnQwWq6juICmxCwe1paaIG/lk4n+ByzxjrwRIjv7ZhNrYYoNJ3n/
hI15g4vIped5BsKQmTdnGUcJXZWpd9rrvYNPa0fe6733ERsKbaH3PYZ1rCDqe0KijXGdD7Q5y4
uXQdkeU/
cCzrDaqvi6fu90EeqP1kMg2m6qbipHLJ0YCK5MsasYhjmbtfUnrNeOTELEDUzhe5QdClMf9mLC
h5gMBEKq/amdjoMN4+fJQM2pBHuSZlTWQ4lGzjTCOQWXLEltgw4L7mWuT4fm/bXfRiNE/
9S4sb3tWBUJEvfxaWZwDxD1I5MIHHnYv7+E= ubuntu@ip-172-31-4-180
Exit
Connect to server1
Vim .ssh/authorized_keys --> paste the above key
Exit
Connect to controller machine
Ssh -v ubuntu@server1 ip address
Same procedure for server 2 (copy paste the keys)
Connect to controller
Install the ansible
Sudo apt-get install software-properties-common
Sudo apt-add-repository ppa:ansible/ansible
Sudo apt-get update
Sudo apt-get install -y ansible
Write the ip adresses of managing nodes in the inventory file
Cd /etc/ansible
$ls
Sudo vim hosts (copy paste server1 and 2 ip addresses)
Adhoc commands: it works based on modules
Command module:
Find out the freespace in the managing nodes
ansible all -i /etc/ansible/hosts -m command -a 'free'
Create files in server1 and 2 from controller
ansible all -i/etc/ansible/hosts -m command -a 'touch f1 f2 f3'
To check files are created or not
Ssh 172.31.5.200
$ls
Apt: to install/uninstall any software
Go to controller
Install git in all server
ansible all -m apt -a 'name=git state=present' -b
Git uninstall in all servers
ansible all -m apt -a 'name=git state=absent' -b
Install tomcat
ansible all -m apt -a 'name=tomcat8 state=present update_cache=yes' -b
(use tomcat9 )
FILE: it is used to create a files and folders in managing nodes
ansible all -m file -a 'name=/tmp/file0 state=touch'
ansible all -m file -a 'name=/tmp/dir1 state=directory'
To check
$ssh privateip of server1
Cd /tmp
Ls
Remove the file or directory
Ansible all -m file -a ‘name=/tmp/file0 state=absent’
Copy: used to copy the file from controller to managing nodes
Change the permissions of file
Ansible all -m copy -a ‘src=one.c dest=/etc/’ -b
Ansible all -m copy -a ‘src=one.c dest=/etc mode=777’ b
Fetch: used to copy the file from manager to controller
ansible all -i /path/to/hosts -m fetch -a 'src=/etc/tomcat9/server.xml
dest=/tmp' -b
To check server.xml file but here we cant see but we see the two ip addresses
Git:
Ansible all -m git -a ‘rep=https://github.com/.git dest=/tmp/mygit’ -b
Service:
Used to start and stop and restart the services
Ansible all -m service -a ‘name=tomcat9 state=stopped’ -b
Started and restarted
Replace: is used to change the port no of servers
From controller connected to managing node
$ssh ip address of server1
$cd /etc/tomcat9/
$ls
$sudo cat server.xml
U can see the portno on above server.xml file in line no 74
ansible all -m replace -a 'regexp=8080 replace=9090 path=/etc/tomcat9/server.xml' -b
We need to restart the service
ansible all -m service -a 'name=tomcat9 state=restarted' -b
To check take the server1 publicip:9090
Uri: I want to check facebook is reachable or not in all managing nodes
$ ansible all -m uri -a 'url=http://facebook.com'
Status code =200 means output green color
Invalid url get status cod -1
Palybook:
Adhoc ommands are capable of working only on one module.
Playbook is combination of plays
Each play is designed to do some activity on the managing nodes
Main advantage is reusability .
Playbooks are created using yaml file
Example:
Playbook to configure tomcat9.
First uninstall tomact9
ansible all -m apt -a 'name=tomcat9 state=absent purge=yes' -b
$vim playbook1.yml
---
- name: Configure tomcat9
hosts: all
tasks:
- name: install tomcat9
apt:
name: tomcat9
state: present
- name: change the port no
replace:
regexp: 9090
replace: 7070
path: /etc/tomcat9/server.xml
...
Check syntax command
ansible-playbook playbook1.yml --syntax-check
Run command
