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---
- name: check if kubeconfig kubelet.conf already exists
stat:
path: /etc/kubernetes/kubelet.conf
register: kubeconfig_kubelet_stats
- name: generate kubeadm.config
template:
src: kubeadm-init.config.j2
dest: /etc/kubernetes/kubeadm.config
register: kubeadm_config
### cluster not yet initialized
- name: create new cluster
when: not kubeconfig_kubelet_stats.stat.exists
block:
- name: initialize kubernetes primary control-plane node and store log
block:
- name: initialize kubernetes primary control-plane node
command: "kubeadm init --config /etc/kubernetes/kubeadm.config --skip-token-print"
args:
creates: /etc/kubernetes/pki/ca.crt
register: kubeadm_init
always:
- name: dump output of kubeadm init to log file
when: kubeadm_init.changed
copy:
content: "{{ kubeadm_init.stdout }}\n"
dest: /etc/kubernetes/kubeadm-init.log
- name: dump error output of kubeadm init to log file
when: kubeadm_init.changed and kubeadm_init.stderr
copy:
content: "{{ kubeadm_init.stderr }}\n"
dest: /etc/kubernetes/kubeadm-init.errors
- name: create bootstrap token for new cluster
command: kubeadm token create --ttl 42m
check_mode: no
register: kubeadm_token_generate
### cluster is already initialized but config has changed
- name: upgrade cluster config
when: kubeconfig_kubelet_stats.stat.exists and kubeadm_config is changed
block:
- name: fail for cluster upgrades
fail:
msg: "upgrading cluster config is currently not supported!"
### cluster is already initialized
- name: prepare cluster for new nodes
when: kubeconfig_kubelet_stats.stat.exists and kubeadm_config is not changed
block:
- name: fetch list of current nodes
command: kubectl --kubeconfig /etc/kubernetes/admin.conf get nodes -o name
changed_when: False
check_mode: no
register: kubectl_node_list
- name: save list of current nodes
set_fact:
kubernetes_current_nodes: "{{ kubectl_node_list.stdout_lines | map('replace', 'node/', '') | list }}"
- name: create bootstrap token for existing cluster
when: "groups['_kubernetes_nodes_'] | map('extract', hostvars, 'kubernetes_node_name') | difference(kubernetes_current_nodes) | length > 0"
command: kubeadm token create --ttl 42m
check_mode: no
register: kubeadm_token_create
## calculate certificate digest
- name: install openssl
apt:
name: openssl
state: present
- name: get ca certificate digest
shell: "set -o pipefail && openssl x509 -pubkey -in /etc/kubernetes/pki/ca.crt | openssl rsa -pubin -outform der 2>/dev/null | openssl dgst -sha256 -hex | sed 's/^.* //'"
args:
executable: /bin/bash
check_mode: no
register: kube_ca_openssl
changed_when: False
- name: set variables needed by kubernetes/nodes to join the cluster
loop: "{{ groups['_kubernetes_nodes_'] }}"
delegate_to: "{{ item }}"
delegate_facts: True
set_fact:
kube_bootstrap_token: "{% if kubeadm_token_generate.stdout is defined %}{{ kubeadm_token_generate.stdout }}{% elif kubeadm_token_create.stdout is defined %}{{ kubeadm_token_create.stdout }}{% endif %}"
kube_bootstrap_ca_cert_hash: "sha256:{{ kube_ca_openssl.stdout }}"
## install node-local-dns
- name: generate node-local dns cache config
template:
src: node-local-dns.yml.j2
dest: /etc/kubernetes/node-local-dns.yml
- name: check if node-local dns cache is already installed
check_mode: no
command: kubectl --kubeconfig /etc/kubernetes/admin.conf diff -f /etc/kubernetes/node-local-dns.yml
failed_when: false
changed_when: false
register: kube_node_local_dns_diff_result
- name: install node-local dns cache
when: kube_node_local_dns_diff_result.rc != 0
command: kubectl --kubeconfig /etc/kubernetes/admin.conf apply -f /etc/kubernetes/node-local-dns.yml
## Network Plugin
- name: install network plugin
include_tasks: "net_{{ kubernetes_network_plugin }}.yml"
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