A simple and effective way to gather machine statistics (RAM, Storage, CPU, etc.) from server environment
Project description
Machine Stats for Unix-like systems
A simple and effective way to gather machine statistics (RAM, Storage, CPU) from a server environment as a first layer of a Tidal Migrations discovery process.
Machine Stats for Linux/Unix leverages Ansible to gather facts in a cross-platform way.
Installation
Install locally in a Python 3 environment:
python3 -m pip install machine-stats
Need to install in an environment without internet access? Checkout how to do that below.
Data captured
For Linux/Unix based systems, by default, the following metrics are captured from the resources and sent and stored in Tidal Migrations:
- Host Name
- FQDN
- IP Addresses
- RAM Allocated (GB)
- RAM Used (GB)
- Storage Allocated (GB)
- Storage Used (GB)
- CPU Count
- Operating System
- Operating System Version
- CPU name
Minimal example
-
Create a
hosts
file in the current directory. -
Add connection strings in the form of
ssh-user@ip-address
orssh-user@domain
to thehosts
file one per line If thessh-user@
part is omitted, then the current user name is used. -
If you need to use a custom SSH identity file for some particular host, provide it as the following:
my-user@example.com ansible_ssh_private_key_file=path/to/key-file.pem
-
Make sure that Python 2.6+ is installed on the machines from
hosts
file. -
If
python
executable was installed into non-default location (not in/usr/bin/python
), add theansible_python_interpreter
parameter to thehosts
file after the host IP/domain, for example:freebsd.example.com ansible_python_interpreter=/usr/local/bin/python
-
Execute
machine-stats
and pipe its output to Tidal Tools:$ machine-stats | tidal sync servers
Additional notes
By default Machine Stats looks for the hosts
file in current working
directory. If your inventory file has another name or is located on another
path, then you should specify it explicitly:
$ machine-stats /path/to/myhosts | tidal sync servers
You can specify multiple inventory files as the following:
$ machine-stats hosts myhosts /path/to/myhosts
Getting information about RHEL 5 hosts
Red Hat Enterprise Linux 5 is shipped with Python 2.4 but machine_stats
requires at least Python 2.6. To install Python 2.6 on your RHEL 5 machine
follow these steps. NOTE: this doesn't update the existing Python packages,
but installs Python 2.6 alongside with system Python packages.
-
Download Python 2.6 package and its dependencies from EPEL repository:
$ sudo curl -L -OOO -k \ http://download.fedoraproject.org/pub/archive/epel/5/x86_64/{python26-libs-2.6.8-2.el5.x86_64.rpm,libffi-3.0.5-1.el5.x86_64.rpm,python26-2.6.8-2.el5.x86_64.rpm}
-
Install the packages:
$ sudo rpm -ivh python26*.rpm libffi*.rpm
-
Use non-standard Python location in your
hosts
file:my-user@rhel5.example.com ansible_python_interpreter=/usr/bin/python2.6
Offline installation
NOTE: Creating the packages archive for offline installation and the actual offline installation process must be performed on machines with the same OS and Python versions.
-
On the machine with internet connection create the packages archive using the following commands:
$ python3 -m pip download -d machine-stats-offline machine-stats $ tar czf machine-stats-offline.tar.gz machine-stats-offline
-
Transfer the archive to the machine where you need to perform the offline installation (replace
<remote-host>
and<remote-dir>
with the appropriate values):$ scp machine-stats-offline.tar.gz <remote-host>:/<remote-dir>/
-
On the remote host, extract the archive and switch to extracted directory:
$ tar xf machine-stats-offline.tar.gz $ cd machine-stats-offline
-
Install Machine Stats and its dependencies:
$ python3 -m pip install --no-index --find-links . machine_stats-*.whl
Generating a hosts
file from Tidal Migrations
Pro-Tip: If you already use Tidal Migrations Ansible Tower integration
script you can
use its output to generate the hosts
file for machine_stats
.
Requirements
Usage
cd ansible-tower-integration
./tidal_inventory.py | jq -r '.servers.hosts[]' > path/to/hosts
Troubleshooting
machine-stats: command not found
If running Machine Stats as a CLI failed, try running it as the following:
$ python3 -m machine_stats
How to permanently enable the Python 3.8 software collection on RHEL 7
You should always enable the Python software collection before using pipenv
with the following command:
scl enable rh-python38 bash
To permanently add Python 3 to your $PATH
, you can add an scl_source
command to the “dot files” for your specific user. The benefit of this approach
is that the collection is already enabled at every login.
Using your preferred text editor, add the following line to your ~/.bashrc
:
# Add RHSCL Python 3 to my login environment
source scl_source enable rh-python38
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