Install Ansible
# yum install ansible
Host file configuration
- File
[ansible@kuber2 ~]$ cat /etc/ansible/hosts
[local]
localhost
[allhost]
mfs091.tuxhub.com
mfs092.tuxhub.com
mfs093.tuxhub.com
Note:-
- Host file we config by ansible.cfg
#inventory = /etc/ansible/hosts
- Command to the list of hosts
-
[ansible@kuber2 ~]$ ansible all --list-hosts
hosts (3): mfs091.tuxhub.com mfs092.tuxhub.com mfs093.tuxhub.com[ansible@kuber2 ~]$ ansible all -i /tmp/hosts --list-hosts hosts (1): mfs023.tuxhub.com
[ansible@kuber2 ~]$
Help in ansible
[ansible@kuber2 ~]$ ansible-doc -l
[ansible@kuber2 ~]$ ansible-doc atomic_host
Create a custom host file
[ansible@kuber2 ~]$ cat /tmp/hosts
[customhosts]
mfs023.tuxhub.com
[ansible@kuber2 ~]$
[ansible@kuber2 ~]$ ansible all -i /tmp/hosts -m ping
mfs023.tuxhub.com | SUCCESS => { "changed": false, "ping": "pong"}
Override Ansible config :
- Seqeunce of file ansible.cfg to be read
- Varibale in env :
[ansible@kuber2 ~]$ export ANSIBLE_CONFIG=/home/ansible/config/ansible.cfg
2. Current dir from where anible command excuted
3. home direcotry of user ( /home/user/.anisble.cfg)
4. /etc/ansible/ansible.cfg
Ansible commandline :
Using Module
1) ping
2) Shell ( ansible <HOST> -m <module > -a <argument > 'COMMAND'
[ansible@kuber2 ~]$ ansible all -m ping
mfs092.tuxhub.com | SUCCESS => {
"changed": false,
"ping": "pong"
}
mfs091.tuxhub.com | SUCCESS => {
"changed": false,
"ping": "pong"
}
mfs093.tuxhub.com | SUCCESS => {
"changed": false,
"ping": "pong"
}
localhost | SUCCESS => {
"changed": false,
"ping": "pong"
}
[ansible@kuber2 ~]$ ansible mfs091.tuxhub.com -m shell -a 'yum list all | grep python'
Ansible System Facts :
[ansible@kuber2 ~]$ ansible mfs091.tuxhub.com -m setup
[ansible@kuber2 facts]$ ansible mfs091.tuxhub.com -m setup --tree /tmp/facts
[ansible@kuber2 facts]$ ansible mfs091.tuxhub.com -m setup -a 'filter=*ipv*'
[ansible@kuber2 ~]$ ansible mfs091.tuxhub.com -m setup -a 'filter=ansible*'
Playbooks :
[ansible@kuber2 plyabook2]$ cat lynx.yml
---
- hosts : all
tasks :
- name : Package Installtion
yum : pkg=lynx state=installed update_cache=true
[ansible@kuber2 plyabook2]$
Playbook Varibales :
- Direct Vairables
[ansible@kuber2 plyabook2]$ cat lynx.yml
---
- hosts : all
vars:
cldbnodes : mfs091.tuxhub.com
tasks :
- name : Package Installtion on {{cldbnodes}}
yum : pkg=lynx state=installed update_cache=true
[ansible@kuber2 plyabook2]$
Output
TASK [Package Installtion on mfs091.tuxhub.com]
2. Varibale via files
[ansible@kuber2 plyabook2]$ cat lynx.yml vars.yml
---
- hosts : all
vars_files:
- vars.yml
tasks :
- name : Package Installtion on {{cldbnodes}}
yum : pkg=lynx state=installed update_cache=true
Var.yml
---
cldbnodes: mfs091.tuxhub.com
[ansible@kuber2 plyabook2]$
3. Run time varibale
[ansible@kuber2 plyabook2]$ cat runtime.yml
---
- hosts : all
user : ansible # run with ansible user
become : yes # using sudo
connection : ssh # over ssh
gather_facts : no # do not gather facts
vars_files:
- vars.yml
vars_prompt :
- name : pkgtoinstall
prompt : Install packges
private : no
Ansible Target Section :
[ansible@kuber2 plyabook2]$ cat target.yml
---
- hosts : all
user : ansible # run with ansible user
become : yes # using sudo
connection : ssh # over ssh
gather_facts : no # do not gather facts
[ansible@kuber2 plyabook2]$
Ansible Task Section :
[ansible@kuber2 plyabook2]$ cat action.yml
---
- hosts : all
user : ansible # run with ansible user
become : yes # using sudo
connection : ssh # over ssh
gather_facts : no # do not gather facts
vars_files:
- vars.yml
tasks :
- name : Check the lynx install
action : yum name=lynx state=installed
[ansible@kuber2 plyabook2]$
Ansible Notify Handler Section :
[ansible@kuber2 plyabook2]$ cat handler.yml
---
- hosts : all
user : ansible # run with ansible user
become : yes # using sudo
connection : ssh # over ssh
gather_facts : no # do not gather facts
vars_files:
- vars.yml
tasks :
- name : Install and handler nginx
action : yum name=nginx state=installed
notify : restart nginx
handlers:
- name : restart nginx
action : service name=nginx state=restarted
[ansible@kuber2 plyabook2]$
Ansible Register Section :
[ansible@kuber2 outline]$ cat resister.yml
--- # Outline to playbook translation
- hosts : all
gather_facts : no
become : true
become_user: root
tasks :
- name : date/time when playbok starts
command : /usr/bin/date
register : timestamp_start
- debug : var=timestamp_start
Ansible Dry run section Section :
[ansible@kuber2 plyabook2]$ ansible-playbook playbook.yml --check
Ansible Async polling Section :
[ansible@kuber2 plyabook2]$ grep fork /etc/ansible/ansible.cfg
#forks = 5
[ansible@kuber2 plyabook2]
The default anisble run 5 nodes at a time but if we need more than 5 mode we need to use async method
[ansible@kuber2 plyabook2]$ cat lynx.yml
---
- hosts : all
become : true
vars_files:
- vars.yml
tasks :
- name : Package Installtion on {{cldbnodes}}
yum : pkg=lynx state=installed update_cache=true
async : 300 # wait for 300 second for sucess
poll : 3 # poll output every 3 second
[ansible@kuber2 plyabook2]$
Ansible Varibale Subsitution Section :
[ansible@kuber2 plyabook2]$ cat lynx.yml
---
- hosts : all
become : true
vars_files:
- vars.yml
tasks :
- name : Package Installtion on {{cldbnodes}}
[ansible@kuber2 plyabook2]$ cat vars.yml
---
cldbnodes: mfs091.tuxhub.com
[ansible@kuber2 plyabook2]$
[ansible@kuber2 plyabook2]$ cat pkg_installtion.yml
---
- hosts : all
become : true
vars_prompt :
- name : Installpackege
prompt : Install packege to be installed
private : no
tasks :
- name : install {{Installpackege}}
action : yum name={{Installpackege}} state=installed
[ansible@kuber2 plyabook2]$
Ansible Lookup Section :
Loopup is Inbuild functions
[ansible@kuber2 plyabook2]$ cat loopkup.yml
---
- hosts : all
become : true
gather_facts : no
tasks :
- debug :
msg: "{{ lookup('env','HOME') }} is the value"
[ansible@kuber2 plyabook2]$
Ansible runonce Section :
It runs only on one system even hosts is all
[ansible@kuber2 plyabook2]$ cat runonce.yml
---
- hosts : all
user : ansible
gather_facts : no
become : true
tasks :
- name : Run at one time
command : /usr/bin/date
register : result
- debug : var=result
run_once : true
[ansible@kuber2 plyabook2]$
Ansible Local action Section : ( 127 .0.0.1)
[ansible@kuber2 plyabook2]$ cat localaction.yml
---
- hosts : 127.0.0.1
connection : local
tasks :
- name : install telent
action : yum name=telnet state=installed
[ansible@kuber2 plyabook2]$
Ansible Loop Section :
[ansible@kuber2 plyabook2]$ cat loop.yml
---
- hosts : all
become : true
gather_facts : no
tasks :
- name : install via loop
action : yum name={{item}} state=installed
with_items:
- lynx
- nginx
[ansible@kuber2 plyabook2]$
Ansible Conditional Section :
[ansible@kuber2 plyabook2]$ cat conditional.yml
---
- hosts : all
become: true
tasks:
- name : install via ngnix conditional
action : yum name=ngnix state=installed
when : ansible_os_family == "centos"
[ansible@kuber2 plyabook2]$
Ansible Until Section :
[ansible@kuber2 plyabook2]$ cat until.yml
---
- hosts : all
become : true
gather_facts : no
tasks :
- name : test until
action : yum name=httpd state=installed
- name : verify status
shell : systemctl status httpd
register : result
until : result.stdout.find("Active (running )") != -1
retry : 5
delay : 5
- debug : var=result
[ansible@kuber2 plyabook2]$
Ansible valut ( passoword )
[ansible@kuber2 plyabook2]$ ansible-vault create secure.yml
New Vault password:
Confirm New Vault password:
[ansible@kuber2 plyabook2]$ cat secure.yml
$ANSIBLE_VAULT;1.1;AES256
35383232613735396438633236613266623432346462333063393061626135396164343830336430
3733663435393065656139613839313832326634666636620a626130353037396631393539373539
66613631393362346538663530633637326439643333623362643766333665373763366531356230
3330333864616530620a613831346637366639663365326562343962646562663532313065366231
6131
[ansible@kuber2 plyabook2]$
[ansible@kuber2 plyabook2]$ ansible-vault view secure.yml
Vault password:
test1=password
[ansible@kuber2 plyabook2]$
Ansible Include
--- # full include task
- hosts : webbox
become : true
connection : ssh
gather_facts: no
tasks :
- include : plays/pkg.yml
[ansible@kuber2 playbooks]$ cat plays/pkg.yml
--- # install telnet
- name : install telent
yum : pkg=telnet state=installed
- name : install lynx
yum : pkg=lynx state=installed
[ansible@kuber2 playbooks]$
Ansible Tags
Just to run verification
[ansible@kuber2 playbooks]$ cat tag.yml
--- # Tag functionallty yml
- hosts : webbox
become : true
gather_facts : no
connection: ssh
tasks :
- name : installe telent and lynx
yum : pkg={{item}} state=latest
with_items :
- telnet
- lynx
tags :
- packages
- name : verify telent install
command : yum list insalled | grep telent
tags :
- verification
[ansible@kuber2 playbooks]$
Execute only tags
[ansible@kuber2 playbooks]$ ansible-playbook tag.yml --tags "verification"
Skip the tags
[ansible@kuber2 playbooks]$ ansible-playbook tag.yml --skip-tags "packages"
Always run the verification ignore only if it skips.
[ansible@kuber2 plyabook2]$ cat tag.yml
--- # Tag functionallty yml
- hosts : all
become : true
gather_facts : no
connection: ssh
tasks :
- name : installe telent and lynx
yum : pkg={{item}} state=latest
with_items :
- telnet
- lynx
tags :
- packages
- name : verify telent install
command : yum list insalled | grep telent
tags :
- always
Ansible ERROR handle:
If ignore_Error : yes then even if first task fails it will continue
[ansible@kuber2 plyabook2]$ cat errorhandle.yml
---
- hosts : all
become : true
gather_facts : no
tasks :
- name : fail command
command : /bin/false
ignore_errors : yes
- name : Install telent
action : yum name=telnet state=installed
[ansible@kuber2 plyabook2]$
Ansible startat / step :
It will ask to perform or not :
[root@kuber2 plyabook2]# cat startat.yml
--- # startat example playbook
- hosts : all
become : true
gather_facts : no
connection : ssh
tasks :
- name : install telnet
yum : pkg=telnet state=latest
- name : install lynx
yum : pkg=lynx state=latest
- name : list dir
shell : ls -l /var
[root@kuber2 plyabook2]#
Ansible command line :
[root@kuber2 plyabook2]# cat fromcmdline.yml
---
- hosts : '{{hosts}}'
user : '{{user}}'
become : true
gather_facts : no
tasks :
- name : Install telent client
action : yum name={{pkg}} state=latest
[root@kuber2 plyabook2]#
[root@kuber2 plyabook2]# ansible-playbook fromcmdline.yml --extra-vars "hosts=all user=ansible pkg=telnet"
