only_nodes_only_install.yml

---
## Preparations
## Making sure python exists on all nodes, so Ansible will be able to run:
- hosts: nodes
  gather_facts: no
  become: yes
  become_method: sudo
  pre_tasks:
  ## It would be best to have ansible already installed on all machines. 
  ## But if it is not, we'll try to do it:
  - name: when no python2, install python2 for Ansible<2.8 (usually required on ubuntu, which defaults to python3) # Alternativelly, for Ubuntu machines, define var: ansible_python_interpreter=/usr/bin/python3
    raw: test -e /usr/bin/python || (apt -y update && apt install -y python-minimal) || (yum install -y python2 python-simplejson)
    register: output
    changed_when: output.stdout != ""
    tags: always
    when:
    - ansible_version.full is version_compare('2.8', '<')
    - ( ansible_python_interpreter is not defined or ansible_python_interpreter == "/usr/bin/python" )
    # ansible_os_family conds. cannot be used as this is before gathering facts (where ansible is required)
    ignore_errors: true
    ## reason for ignore_errors: true
    ## "version_compare" was replaced with "version" starting ansible 2.5;
    ## CentOS/RHEL 7.x use ansible 2.4, so not able to grasp what version_compare is.
    ## Ansible 2.9 removes the version_compare and does not recognize it any longer.
    ## As our need is to add python2 only on versions before 2.8, if this fails
    ## (due to missing version_compare command), we are fine.
    ## We do not cover cases where it fails due to other reasons, but that is a reasonable risk,
    ## and that issue will be captured later in the flow.

  - name: when no python(2/3), install python3(Debian) python2(RedHat) for Ansible>=2.8 # Alternativelly, for Ubuntu machines, define var: ansible_python_interpreter=/usr/bin/python3
    raw: test -e /usr/bin/python || (apt -y update && apt install -y python3-minimal) || (yum install -y python2 python-simplejson)
    register: output
    changed_when: output.stdout != ""
    tags: always
    when:
    - ansible_version.full is version('2.8', '>=') or ( ansible_python_interpreter is defined and ansible_python_interpreter == "/usr/bin/python3" )
    # ansible_os_family conds. cannot be used as this is before gathering facts (where ansible is required)
    ignore_errors: true
    ## reason for ignore_errors: true
    ## is similar to the one explained above (complements it)

  - setup: # aka gather_facts
    tags: always # required for tags, see ansible issue: #14228
    
  - name: test min. vars (group_vars/all) are set (ClusterConfiguration and k8s_network_addons_urls)
    debug: msg='Make sure min. vars are set in group_vars/all/ (e.g. ClusterConfiguration and k8s_network_addons_urls)'
    when: 
    - ClusterConfiguration is not defined
    - JoinConfiguration is not defined
    failed_when: 
    - ClusterConfiguration is not defined
    - JoinConfiguration is not defined
    tags: always # always check if we have vars in place

- hosts: nodes
  become: yes
  become_method: sudo
  tags:
  - node
  roles:
  - { role: common, task: all, tags: [ 'common', 'install', 'common_install', 'node_install', 'node' ], when: "inventory_hostname not in groups['masters']" }

## node -> install nodes (kubeadm join, etc)
- hosts: nodes
  become: yes
  become_method: sudo
  any_errors_fatal: yes
  tags:
  - node
  - install
  - node_install
  roles:
  - { role: non-primary-master, tags: [ 'node', 'install', 'node_install'], when: "inventory_hostname not in groups['masters']" }

## node -> label nodes (even when master is also a node)
- hosts: nodes
  become: yes
  become_method: sudo
  any_errors_fatal: yes
  tags:
  - node
  - install
  - node_install
  - label
  roles:
  - { role: tools, task: labels, tags: [ 'label'] }

### For fixes like vsphere's bug, we have to reboot after some more fixes...
#https://github.com/vmware/kubernetes/issues/495
- hosts: mustrebootlist
  gather_facts: no
  become: yes
  become_method: sudo
  tags:
  - mustrebootlist
  - vsphere_bug_fix
  - vsphere
  roles:
  - { role: tools, task: reboot, tags: [ 'reboot_minimal' ], when: "ClusterConfiguration.cloudProvider is defined and ClusterConfiguration.cloudProvider == 'vsphere' and allow_restart | default(False) and vsphere_bug_fix is defined and vsphere_bug_fix" }

## Generic Sanity
- hosts: masters
  become: yes
  become_method: sudo
  tags:
  - master
  pre_tasks:
  - name: remove temporary mustreboot temporary group
    group:
      name: mustrebootlist
      state: absent
  roles:
  - { role: tools, task: cluster_sanity, tags: [ 'cluster_sanity', 'sanity' ] }
  - { role: tools, task: postinstall_messages, tags: [ 'cluster_sanity', 'sanity' ] }

## to reset/add only some (more) nodes:
##   1. keep in hosts only:
##      - the master
##      - the affected node (all other nodes should not be there)
##   2. Have the token defined in the group_vars/all
##   3. Run using only this/these tag(s):
## ansible-playbook -i hosts -v site.yml --tags "node"   # same with: ansible-playbook -i hosts -v site.yml --tags "node_reset,node_install,cluster_sanity,cluster_info"

## To get cluster info/sanity:
## ansible-playbook -i hosts -v site.yml --tags "cluster_sanity,cluster_info"