Ansible Installation Steps Red Hat Enterprise Linux 7 (RHEL 7)
Ansible is a simple IT automation engine that automates provisioning, configuration management, application deployment and many other IT needs. Designed for multi-tier deployments, ansible models your IT infrastructure by describing how all of your systems interrelate, rather than just managing one system at a time. In this Article we are going to learn Ansible Installation Steps Red Hat Enterprise Linux 7 – RHEL 7.
It uses no agents and no additional custom security infrastructure, so it’s easy to deploy – and most importantly, it uses a very simple language YAML that allow you to describe your automation jobs in a way that approaches plain English.
Ansible Architecture
Ansible works by connecting to your nodes and pushing out small programs, called “Ansible modules” to them. These programs are written to be resource models of the desired state of the system. Ansible then executes these modules using SSH Protocol, and removes them when finished.
Your library of modules can reside on any machine, and there are no servers, daemons, or databases required. Typically you will work with your favorite terminal program, a text editor, and probably a version control system to keep track of changes to your content.
Ansible Installation RHEL 7
To Install Ansible, we have to configure EPEL Repository then install using this extra repository
# wget http://dl.fedoraproject.org/pub/epel/7/x86_64/e/epel-release-7-10.noarch.rpm # rpm -ivh epel-release-7-10.noarch.rpm
If your directly trying to install using yum command it will end up with below error
Required: python-jinja2 Requires: PyYAML Require: python-pyasn1
Why above error is occurring i already configured EPEL repository it contains most of the required RPM’s (typically Python). But recently Red Hat is moved python-jinja2 and PyYAML packages are part of Optional Server repository. To install these you have to subscribe to RHEL. Alternative is download them manually and install.
# yum install python-dev python-pip # yum install gcc gcc+
Install above packages and verify pip version, Pip version must be 9 or above, if not try upgrade as shown below
[root@ArkIT-Serv ~]# pip --version pip8.1.2 from /usr/lib/python2.7/site-packages (python 2.7) # pip install --upgrade pip
Dependencies needs to be resolved manually
# yum install python2-crypto python2-paramiko python-htt* # wget ftp://195.220.108.108/linux/centos/7.3.1611/os/x86_64/Packages/python-jinja2-2.7.2-2.el7.noarch.rpm # wget ftp://195.220.108.108/linux/centos/7.3.1611/os/x86_64/Packages/python-babel-0.9.6-8.el7.noarch.rpm # rpm -ivh python-babel-0.9.6-8.el7.noarch.rpm # wget ftp://195.220.108.108/linux/centos/7.3.1611/os/x86_64/Packages/python-markupsafe-0.11-10.el7.x86_64.rpm # rpm -ivh python-markupsafe-0.11-10.el7.x86_64.rpm # rpm -ivh python-jinja2-2.7.2-2.el7.noarch.rpm # wget ftp://195.220.108.108/linux/centos/7.3.1611/os/x86_64/Packages/libyaml-0.1.4-11.el7_0.i686.rpm # rpm -ivh libyaml-0.1.4-11.el7_0.i686.rpm --nodeps
Now Try Ansible installation using pip command
# yum install ansible
Check ansible installed Version
[root@ArkIT-Serv ~]# ansible --version ansible 2.3.2.0 config file = /etc/ansible/ansible.cfg configured module search path = Default w/o overrides python version = 2.7.5 (default, Aug 2 2016, 04:20:16) [GCC 4.8.5 20150623 (Red Hat 4.8.5-4)]
That’s it. Ansible Installation Steps RHEL 7 Completed and Installation is successful.
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Nice article. But pls check ansible config file path is not visible. Correct the installation.
I’ve encountered the following error:
[root@ansiblemaster tmp]# ansible –version
ERROR! Unexpected Exception, this is probably a bug: (cryptography 0.8.2 (/usr/lib64/python2.7/site-packages), Requirement.parse(‘cryptography>=1.1’))
the full traceback was:
Traceback (most recent call last):
File “/usr/bin/ansible”, line 97, in
mycli = getattr(__import__(“ansible.cli.%s” % sub, fromlist=[myclass]), myclass)
File “/usr/lib/python2.7/site-packages/ansible/cli/__init__.py”, line 38, in
from ansible.inventory.manager import InventoryManager
File “/usr/lib/python2.7/site-packages/ansible/inventory/manager.py”, line 36, in
from ansible.plugins.loader import inventory_loader
File “/usr/lib/python2.7/site-packages/ansible/plugins/loader.py”, line 22, in
from ansible.parsing.utils.yaml import from_yaml
File “/usr/lib/python2.7/site-packages/ansible/parsing/utils/yaml.py”, line 17, in
from ansible.parsing.yaml.loader import AnsibleLoader
File “/usr/lib/python2.7/site-packages/ansible/parsing/yaml/loader.py”, line 30, in
from ansible.parsing.yaml.constructor import AnsibleConstructor
File “/usr/lib/python2.7/site-packages/ansible/parsing/yaml/constructor.py”, line 29, in
from ansible.parsing.vault import VaultLib
File “/usr/lib/python2.7/site-packages/ansible/parsing/vault/__init__.py”, line 42, in
from cryptography.hazmat.backends import default_backend
File “/usr/lib64/python2.7/site-packages/cryptography/hazmat/backends/__init__.py”, line 7, in
import pkg_resources
File “/usr/lib/python2.7/site-packages/pkg_resources.py”, line 3011, in
parse_requirements(__requires__), Environment()
File “/usr/lib/python2.7/site-packages/pkg_resources.py”, line 630, in resolve
raise VersionConflict(dist,req) # XXX put more info here
VersionConflict: (cryptography 0.8.2 (/usr/lib64/python2.7/site-packages), Requirement.parse(‘cryptography>=1.1’))
[root@ansiblemaster tmp]#