machine_stats 0.2.0

A simple and effective way to gather machine statistics (RAM, Storage, CPU, etc.) from server environment

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

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.

1. 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
   

2. 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>/
   

3. On the remote host, extract the archive and switch to extracted directory:

   $ tar xf machine-stats-offline.tar.gz
   $ cd machine-stats-offline
   

4. Install Machine Stats and its dependencies:

   $ python3 -m pip install --no-index --find-links . machine_stats-*.whl
   

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

1. Create a hosts file in the current directory.

2. Add connection strings in the form of ssh-user@ip-address or ssh-user@domain to the hosts file one per line If the ssh-user@ part is omitted, then the current user name is used.

3. If you need to use a custom SSH identity file for some particular host, provide it as the following:

   [e-mail] ansible_ssh_private_key_file=path/to/key-file.pem
   

4. Make sure that Python 2.6+ is installed on the machines from hosts file.

5. If python executable was installed into non-default location (not in /usr/bin/python), add the ansible_python_interpreter parameter to the hosts file after the host IP/domain, for example:

   freebsd.example.com ansible_python_interpreter=/usr/local/bin/python
   

6. 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.

1. 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}
   

2. Install the packages:

   $ sudo rpm -ivh python26*.rpm libffi*.rpm
   

3. Use non-standard Python location in your hosts file:

   [e-mail] ansible_python_interpreter=/usr/bin/python2.6
   

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

• jq

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