##### Steps for deployment of Ansible on CentOS 7

##### Dependency Tasks

### Install EPEL
sudo yum install epel-release

### Install pending updates
sudo yum -y update

##### Install Ansible

### Install Ansible
sudo yum -y install ansible

### Verify the Version
ansible –version

[db]
node1.rmohan.com
[app]
node2.rmohan.com
[db]
node3.rmohan.com

ansible all –list-hosts
ansible db –list-hosts
ansible db -m ping

connect with password authentication, it’s possible to do with “k”
ansible db -k -m command -a “uptime”

ansible db -k -m command -a “cat /etc/shadow” -b –ask-become-pass

other user’s priviledge except root, specify the option “–become-user=xxx”.
If you’d like to use another way to use priviledge except sudo (su | pbrun | pfexec | runas), specify the option “–become-method=xxx”.

ansible db -m ping
ansible db -m command -a uptime
ansible db -a “tail /var/log/dmesg”

ansible -m ping db
ansible -m ping -all
ansible -m command -a “df -h” db
ansible -m command -a “free -mt” db
ansible -m command -a “uptime” all
ansible -m command -a “arch” all
ansible -m shell -a “hostname” all
ansible -m command -a “df -h” db > /tmp/df_outpur.txt

ansible all -a “echo hello world”
ansible all -m ping
ansible db -m ping
ansible db -m setup -l node-1
ansible db -m command -a “hostname”
ansible db -m command -a “hostname” -o
ansible db -m command -a “uptime”
ansible db -m shell -a ‘echo $TERM’
ansible db -b -m yum -a “name=httpd state=present”

ansible web -b -m service -a “name=httpd state=started”
ansible web -b -m service -a “name=httpd state=stopped”

ansible web -a “/sbin/reboot” -f 10

Adhoc Commands

ansible web -a “yum update -y”
ansible app -a “yum -y install tomcat”
ansible app -a “service tomcat status”
ansible app -a “service tomcat start”
ansible app -a “yum -y install curl wget”
ansible app -a “curl web”
ansible app -a “bash -c ‘curl -k https://github.com/opstree-ansible/ansible-training/blob/master/attendees/exercise/application/sample.war > /var/lib/tomcat/webapps/sample.war'”
ansible app -a “service tomcat restart”
ansible app -a “curl node2.rmohan.com:8080/sample/”

ansible centos -m copy -a “src=test.txt
ansible centos -m copy -a “src=test.txt dest=/tmp/test.txt”
ansible centos -m yum -a “install libselinux-python”
ansible centos -m copy -a “src=test.txt dest=/tmp/test.txt”

vi playbook_sample.yml
# target hostname or group name
– hosts: web
# define tasks
tasks:
# task name (any name you like)
– name: Test file
# use file module to set the file state
file: path=/tmp/test.conf state=touch owner=root group=root mode=0600

run Playbook
ansible-playbook playbook_sample.yml

ansible web1 -m command -a “ls -l /tmp/”

[root@controller test]# ansible web -m command -a “ls -l /tmp/test.conf”
node1.rmohan.com | SUCCESS | rc=0 >>
-rw——- 1 root root 0 Mar 31 20:29 /tmp/test.conf

create a Playbook which Apache httpd is installed and running.
vi playbook_sample2.yml
– hosts: web
# use priviledge (default : root)
become: yes
# the way to use priviledge
become_method: sudo
# define tasks
tasks:
– name: httpd is installed
yum: name=httpd state=installed
– name: httpd is running and enabled
service: name=httpd state=started enabled=yes

ansible-playbook -v playbook_sample2.yml –ask-become-pass

ansible web -m shell -a “/bin/systemctl status httpd | head -3” -b –ask-become-pass

[root@controller test]# ansible web -m shell -a “/bin/systemctl status httpd | head -3” -b –ask-become-pass
SUDO password:
node1.rmohan.com | SUCCESS | rc=0 >>
? httpd.service – The Apache HTTP Server
Loaded: loaded (/usr/lib/systemd/system/httpd.service; enabled; vendor preset: disabled)
Active: active (running) since Sat 2018-03-31 20:36:52 +08; 46s ago

/root/ansible/playbook/test

playbook_sample.yml

– hosts: db
become: yes
become_method: sudo
tasks:
– name: General packages are installed
yum: name={{ item }} state=installed
with_items:
– vim-enhanced
– wget
– unzip
tags: General_Packages

[root@controller test]# ansible-playbook playbook_sample.yml –ask-become-pass
SUDO password:

PLAY [db] *****************************************************************************************************************************************************************************************************************************************************************

TASK [Gathering Facts] ****************************************************************************************************************************************************************************************************************************************************
ok: [node3.rmohan.com]

TASK [General packages are installed] *************************************************************************************************************************************************************************************************************************************
ok: [node3.rmohan.com] => (item=[u’vim-enhanced’, u’wget’, u’unzip’])

PLAY RECAP ****************************************************************************************************************************************************************************************************************************************************************
node3.rmohan.com : ok=2 changed=0 unreachable=0 failed=0

[root@controller test]#

ansible db -m shell -a “rpm -qa | grep -E ‘vim-enhanced|wget|unzip'” –ask-become-pass

variables from “GATHERING FACTS”
vi playbook_sample3.yml

# refer to “ansible_distribution”, “ansible_distribution_version”
– hosts: target_servers
tasks:
– name: Refer to Gathering Facts
command: echo “{{ ansible_distribution }} {{ ansible_distribution_version }}”
register: dist
– debug: msg=”{{ dist.stdout }}”

[root@controller test]# ansible-playbook playbook_sample3.yml

PLAY [web] ****************************************************************************************************************************************************************************************************************************************************************

TASK [Gathering Facts] ****************************************************************************************************************************************************************************************************************************************************
ok: [node1.rmohan.com]

TASK [Refer to Gathering Facts] *******************************************************************************************************************************************************************************************************************************************
changed: [node1.rmohan.com]

TASK [debug] **************************************************************************************************************************************************************************************************************************************************************
ok: [node1.rmohan.com] => {
“msg”: “CentOS 7.4.1708″
}

PLAY RECAP ****************************************************************************************************************************************************************************************************************************************************************
node1.rmohan.com : ok=3 changed=1 unreachable=0 failed=0

vi playbook_sample4.yml
– hosts: target_servers
become: yes
become_method: sudo
handlers:
– name: restart sshd
service: name=sshd state=restarted
tasks:
– name: edit sshd_config
lineinfile: >
dest=/etc/ssh/sshd_config
regexp=”{{ item.regexp }}”
line=”{{ item.line }}”
with_items:
– { regexp: ‘^#PermitRootLogin’, line: ‘PermitRootLogin no’ }
notify: restart sshd
tags: Edit_sshd_config

ansible-playbook playbook_sample4.yml –ask-become-pass

export JAVA_HOME=/opt/java/java/
export JRE_HOME=/opt/java/java/jre
export PATH=$PATH:/opt/java/java/bin:/opt/java/java/jre/bin

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