Ansible in action

DevOps
ansible

Environment

os: centos7
ansible version: 2.5

install ansible:

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sudo yum install ansible

inventory file:

/etc/ansible/hosts

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[webserver]
192.168.8.215

[dbserver]
192.168.8.214

Or whereever your inventory file is and use -i to specific it.

Set login without password：

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ssh-copy-id user@your-server-ip

Test ping ur host

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ansible all -m ping

set user and root:

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ansbile all -m ping -u bruce --sudo

using shell module:

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ansible all -m shell -a 'echo $(hostname -i)'

Playbook:

playbook.yml content with:

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---
- hosts: all
  remote_user: rootrl
  tasks:
   - name: test connection
     ping:
   - name: test a script
     script: ./script.sh

script.sh:

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#!/usr/bin/env bash

cat <<TPL > hay.txt
hello
        this is text
TPL

before run:

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# check syntax
ansible-playbook playbook.yml --syntax-check

# check host list
ansible-playbook playbook.yml --list-hosts

run:

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ansible-playbook playbook.yml

run cat to proof stuff has changed:

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ansible all -m shell -a "cat /home/rootrl/hay.txt"

Demo:

https://github.com/rootrl/Init-new-instance-with-ansible.git

git clone and run:

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ansible-playbook -i hosts main.yml

Result:

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[rootrl@jdu4e00u53f7 Init-new-instance-with-ansible]$ ansible-playbook -i hosts main.yml

PLAY [webserver] *************************************************************************************************************************************

TASK [Gathering Facts] *******************************************************************************************************************************
ok: [45.77.44.159]

TASK [test ping] *************************************************************************************************************************************
ok: [45.77.44.159]

TASK [install docker] ********************************************************************************************************************************

changed: [45.77.44.159]

TASK [test docker] ***********************************************************************************************************************************
changed: [45.77.44.159]

TASK [debug] *****************************************************************************************************************************************
ok: [45.77.44.159] => {
    "msg": [
        "",
        "Hello from Docker!",
        "This message shows that your installation appears to be working correctly.",
        "",
        "To generate this message, Docker took the following steps:",
        " 1. The Docker client contacted the Docker daemon.",
        " 2. The Docker daemon pulled the \"hello-world\" image from the Docker Hub.",
        "    (amd64)",
        " 3. The Docker daemon created a new container from that image which runs the",
        "    executable that produces the output you are currently reading.",
        " 4. The Docker daemon streamed that output to the Docker client, which sent it",
        "    to your terminal.",
        "",
        "To try something more ambitious, you can run an Ubuntu container with:",
        " $ docker run -it ubuntu bash",
        "",
        "Share images, automate workflows, and more with a free Docker ID:",
        " https://hub.docker.com/",
        "",
        "For more examples and ideas, visit:",
        " https://docs.docker.com/engine/userguide/"
    ]
}

TASK [install shadowsock] ****************************************************************************************************************************
changed: [45.77.44.159]

PLAY RECAP *******************************************************************************************************************************************
45.77.44.159               : ok=6    changed=3    unreachable=0    failed=0
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