Transcript 自动化运维--Ansible

自动化运维--Ansible
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讲师： Breeze Yan
自动化运维QQ群： 22346584
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课程目录
Course Contents
一、Ansible简介与Hosts Inventory
二、Ansible常用模块
三、Ansible Playbook简单介绍
四、Playbook的角色及包含
五、Playbook常用模块
六、Playbook的变量
七、Playbook的条件判断
八、Playbook的循环
九、自定义模块
十、Ansible生产案例
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Ansible Variables
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Variables Defined in Inventory
Variables Defined in a Playbook
Variables Defined in Commandline
Registered Variables
Variables defined from included files and roles
Using Variables: About Jinja2
Facts
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Variables Defined in Inventory
[webservers]
app1_server http_port=80
[webservers:vars]
some_server=foo.southeast.example.com
halon_system_timeout=30
self_destruct_countdown=60
escape_pods=2
/etc/ansible/host_vars/app1_server
/etc/ansible/group_vars/webservers
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Variables Defined in a Playbook
vars
vars_files
vars_prompt
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Variables Defined in a Commandline
- hosts: mfs_node
user: "{{ uservar }}"
tasks:
- shell: echo "{{ echovar }}"
ansible-playbook command_vars.yml -e 'uservar="root" echovar="hello world"'
ansible-playbook command_vars.yml -e '{"uservar":"root", "echovar":"hello world"}'
ansible-playbook command_vars.yml -e '@test.json'
cat test.json
uservar: root
echovar: hello world
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Registered Variables
- hosts: mfs_node
tasks:
- shell: echo "5"
register: result
ignore_errors: True
- debug: msg="it failed"
when: result|failed
- debug: msg="{{result.stdout}}"
- shell: /usr/bin/bar
when: result.rc == 5
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roles
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Using Variables: About Jinja2
template: src=foo.cfg.j2 dest={{ remote_install_path }}/foo.cfg
{{ some_variable | default(5) }}
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Facts
system facts
local facts
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System Facts
ansible <hostname> -m setup
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Local Facts
- hosts: webservers
tasks:
- name: create directory for ansible custom facts
file: state=directory recurse=yes path=/etc/ansible/facts.d
- name: install custom impi fact
copy: src=ipmi.fact dest=/etc/ansible/facts.d
- name: re-read facts after adding custom fact
setup: filter=ansible_local
cat ipmi.fact
[general]
asdf=1
bar=2
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Registered Variables
- hosts: web_servers
tasks:
- shell: /usr/bin/foo
register: foo_result
ignore_errors: True
- shell: /usr/bin/bar
when: foo_result.rc == 5
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Omitting Undefined Variables
- name: touch files with an optional mode
file: dest={{item.path}} state=touch mode={{item.mode|default(omit)}}
with_items:
- path: /tmp/foo
- path: /tmp/bar
- path: /tmp/baz
mode: "0444"
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A YAML Gotcha
#This won’t work:
- hosts: app_servers
vars:
app_path: {{ base_path }}/22
#Do it like this and you’ll be fine:
- hosts: app_servers
vars:
app_path: "{{ base_path }}/22"
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Thank You !
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