Install Ansible and run a playbbook from linux

#yum install ansible

it available in epel repository, for redhat you have to buy dedicated subscription for ansible

once installed

you have to specify our target hosts in to /etc/ansible/hosts

# vi /etc/ansible/hosts

[root@ansibleserver playbook]# ansible --list-host all
  hosts (1):
    172.31.50.3

[root@ansibleserver playbook]# ansible --list-host client
  hosts (1):
    172.31.50.3

[root@ansibleserver playbook]# ansible all -m ping
172.31.50.3 | UNREACHABLE! => {
    "changed": false,
    "msg": "Failed to connect to the host via ssh: ssh: connect to host 172.31.50.3 port 22: No route to host",
    "unreachable": true
}


# ssh-keygen -t rsa

//after create the key i have copied the id_rsa.pub key and pasted into the client server /root/.ssh/authorized_keys

[root@ansibleserver playbook]# ansible client -m ping
34.x.x.x | SUCCESS => {
    "ansible_facts": {
        "discovered_interpreter_python": "/usr/libexec/platform-python"
    },
    "changed": false,
    "ping": "pong"
}




//after that it's pinging




// now create the playbook

[root@ansibleserver playbook]# vi nginx-install.yml
--
- name: nginx install & start services
  hosts: all
  become: true

  tasks:
  - name: install nginx
    yum:
      name: nginx
      state: latest


  - name: start nginx
    service:
      name: nginx
      state: started





//save , and this my play book to install nginx and start the service




//for validate yaml file online http://www.yamllint.com/

//before run the book make sure the service which are already running on client
[root@ansibleclient ec2-user]# yum list installed | grep nginx

//so not installed from client side

//go to the server

[root@ansibleserver playbook]# ansible-playbook -i /etc/ansible/hosts nginx-install.yml --check

PLAY [nginx install & start services] ****************************************************************************************************************

TASK [Gathering Facts] *******************************************************************************************************************************
ok: [34.x.x.x]

TASK [install nginx] *********************************************************************************************************************************
changed: [34.x.x.x.x]

TASK [start nginx] ***********************************************************************************************************************************
changed: [34.x.x.x.x]

PLAY RECAP *******************************************************************************************************************************************
34.x.x.x.x             : ok=3    changed=2    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0  

[root@ansibleserver playbook]#


 //if all test are sucessful , then we can remove the --check and execute

[root@ansibleserver playbook]# ansible-playbook -i /etc/ansible/hosts nginx-install.yml --check

PLAY [nginx install & start services] ****************************************************************************************************************

TASK [Gathering Facts] *******************************************************************************************************************************
ok: [34.]

TASK [install nginx] *********************************************************************************************************************************
changed: [34.]

TASK [start nginx] ***********************************************************************************************************************************
changed: [34.]

PLAY RECAP *******************************************************************************************************************************************
34.2             : ok=3    changed=2    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0  

[root@ansibleserver playbook]# ansible-playbook -i /etc/ansible/hosts nginx-install.yml

PLAY [nginx install & start services] ****************************************************************************************************************

TASK [Gathering Facts] *******************************************************************************************************************************
ok: [34.]

TASK [install nginx] *********************************************************************************************************************************
changed: [34.]

TASK [start nginx] ***********************************************************************************************************************************
changed: [34.]

PLAY RECAP *******************************************************************************************************************************************
34.            : ok=3    changed=2    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0  

 //now sucessfully installed.

//check from client side
[root@ansibleclient ec2-user]# yum list installed | grep nginx
nginx.x86_64                                  1:1.14.1-9.module+el8.0.0+4108+af250afe   @rhel-8-appstream-rhui-rpms
nginx-all-modules.noarch                      1:1.14.1-9.module+el8.0.0+4108+af250afe   @rhel-8-appstream-rhui-rpms
nginx-filesystem.noarch                       1:1.14.1-9.module+el8.0.0+4108+af250afe   @rhel-8-appstream-rhui-rpms
nginx-mod-http-image-filter.x86_64            1:1.14.1-9.module+el8.0.0+4108+af250afe   @rhel-8-appstream-rhui-rpms
nginx-mod-http-perl.x86_64                    1:1.14.1-9.module+el8.0.0+4108+af250afe   @rhel-8-appstream-rhui-rpms
nginx-mod-http-xslt-filter.x86_64             1:1.14.1-9.module+el8.0.0+4108+af250afe   @rhel-8-appstream-rhui-rpms
nginx-mod-mail.x86_64                         1:1.14.1-9.module+el8.0.0+4108+af250afe   @rhel-8-appstream-rhui-rpms
nginx-mod-stream.x86_64                       1:1.14.1-9.module+el8.0.0+4108+af250afe   @rhel-8-appstream-rhui-rpms

//installed

//adhoc commands using ansible

[root@ansibleserver playbook]# ansible -m shell -a "uname -a" client

[root@ansibleserver playbook]# ansible -m shell -a "hostname" client

//send files using adhoc command

[root@ansibleserver playbook]# ansible -m copy -a "src=/tmp/boobal.txt dest=/tmp/ mode=700" client
34.2| CHANGED => {
    "ansible_facts": {
        "discovered_interpreter_python": "/usr/libexec/platform-python"
    },
    "changed": true,
    "checksum": "91d0f879a8683f9f5626568b08f0264117e2d02c",
    "dest": "/tmp/boobal.txt",
    "gid": 0,
    "group": "root",
    "md5sum": "ca378755c55dc6b8f7f80641869d1bdf",
    "mode": "0700",
    "owner": "root",
    "secontext": "unconfined_u:object_r:admin_home_t:s0",
    "size": 19,
    "src": "/root/.ansible/tmp/ansible-tmp-1595953268.487625-3723354-124487860798885/source",
    "state": "file",
    "uid": 0
}

[root@ansibleserver playbook]# ansible -m shell -a "cat /tmp/boobal.txt" client
34.207.190.100 | CHANGED | rc=0 >>
hi this is my file