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Clustershell external groups sources from foreman

Define external group sources for clustershell from Foreman or katello

This is a modification of the ansible foreman inventory in https://github.com/ansible/ansible/blob/devel/contrib/inventory/foreman.py

Only the methods _print_data() and parse_cli_args() in class ForemanInventory from the original code are overriden. Check class ClusterShellInventory in clustershell_dynamic_groups_foreman.py to see the changes.

Installation

Assuming that you have already installed clustershell and you have a config folder /etc/clustershell clone this repo inside:

git clone https://github.com/pescobar/clustershell_dynamic_groups_foreman.git /etc/clustershell/clustershell_dynamic_groups_foreman

Now edit /etc/clustershell/clustershell_dynamic_groups_foreman/foreman.ini with your proper foreman url, user and password. e.g.

[foreman]
url = https://my-katello-server.com
user = myforemanuser
password = myforemanpassword
ssl_verify = False

Define the cache folder in /etc/clustershell/clustershell_dynamic_groups_foreman/foreman.ini and create it. e.g.

[cache]
path = ~/.cache/clustershell_dynamic_groups_foreman
max_age = 86400

mkdir -p ~/.cache/clustershell_dynamic_groups_foreman

The cache is valid for 24h (I don't add new foreman hosts too often). Adapt it to your needs if desired. You can always use the option --refresh-cache to force a cache refresh.

Installing the dependencies using conda

Install the dependencies defined in requirements.txt using conda (you can install the deps systems wide using pip if you prefer and use the system python binary)

$> wget https://repo.continuum.io/miniconda/Miniconda2-latest-Linux-x86_64.sh
$> bash Miniconda2-latest-Linux-x86_64.sh -p /opt/miniconda2
$> export PATH=/opt/miniconda2/bin:$PATH
$> pip install -r /etc/clustershell/clustershell_dynamic_groups_foreman/requirements.txt

Check you can contact foreman

/opt/miniconda2/bin/python /etc/clustershell/clustershell_dynamic_groups_foreman/clustershell_dynamic_groups_foreman.py -h
/opt/miniconda2/bin/python /etc/clustershell/clustershell_dynamic_groups_foreman/clustershell_dynamic_groups_foreman.py --list-groups
/opt/miniconda2/bin/python /etc/clustershell/clustershell_dynamic_groups_foreman/clustershell_dynamic_groups_foreman.py --all-hosts

Update the clustershell config to fetch external groups from foreman

Edit /etc/clustershell/groups.conf

[Main]

# Default group source
#default: local
default: foreman

confdir: /etc/clustershell/groups.conf.d $CFGDIR/groups.conf.d

autodir: /etc/clustershell/groups.d $CFGDIR/groups.d

[local]
map: [ -f $CFGDIR/groups ] && f=$CFGDIR/groups || f=$CFGDIR/groups.d/local.cfg; sed -n 's/^$GROUP:\(.*\)/\1/p' $f
all: [ -f $CFGDIR/groups ] && f=$CFGDIR/groups || f=$CFGDIR/groups.d/local.cfg; sed -n 's/^all:\(.*\)/\1/p' $f
list: [ -f $CFGDIR/groups ] && f=$CFGDIR/groups || f=$CFGDIR/groups.d/local.cfg; sed -n 's/^\([0-9A-Za-z_-]*\):.*/\1/p' $f

[foreman]
map: /opt/miniconda2/bin/python /etc/clustershell/clustershell_dynamic_groups_foreman/clustershell_dynamic_groups_foreman.py --group $GROUP
all: /opt/miniconda2/bin/python /etc/clustershell/clustershell_dynamic_groups_foreman/clustershell_dynamic_groups_foreman.py --all-hosts
list: /opt/miniconda2/bin/python /etc/clustershell/clustershell_dynamic_groups_foreman/clustershell_dynamic_groups_foreman.py --list-groups
reverse: /opt/miniconda2/bin/python /etc/clustershell/clustershell_dynamic_groups_foreman/clustershell_dynamic_groups_foreman.py --reverse $NODE

And check it's working

$> nodeset -LL

Use foreman groups with clush

Try /opt/miniconda2/bin/python /etc/clustershell/clustershell_dynamic_groups_foreman/clustershell_dynamic_groups_foreman.py --list-groups or nodeset -LL to get a list of all the available groups in foreman and then try:

$> clush -bw @foreman_hostgroup_compute_nodes 'uname -r'