mirror of
https://github.com/geerlingguy/ansible-role-kubernetes.git
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Fixes #2: Make role work with nodes joining master.
This commit is contained in:
Jeff Geerling
parent
4536128126
commit
2138cc7d69
44
README.md
44
README.md
@ -22,6 +22,10 @@ Available variables are listed below, along with default values (see `defaults/m
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Kubernetes packages to be installed on the server. You can either provide a list of package names, or set `name` and `state` to have more control over whether the package is `present`, `absent`, `latest`, etc.
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kubernetes_role: master
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Whether the particular server will serve as a Kubernetes `master` (default) or `node`. The master will have `kubeadm init` run on it to intialize the entire K8s control plane, while `node`s will have `kubeadm join` run on them to join them to the `master`.
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kubernetes_kubelet_extra_args: ""
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Extra args to pass to `kubelet` during startup. E.g. to allow `kubelet` to start up even if there is swap is enabled on your server, set this to: `"--fail-swap-on=false"`.
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@ -34,11 +38,16 @@ Whether to remove the taint that denies pods from being deployed to the Kubernet
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Whether to enable the Kubernetes web dashboard UI (only accessible on the master itself, or proxied).
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kuberenetes_debug: False
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Whether to show extra debug info in Ansible's logs (e.g. the output of the `kubeadm init` command).
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kubernetes_pod_network_cidr: '10.0.1.0/16'
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kubernetes_apiserver_advertise_address: ''
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kubernetes_version: 'stable-1.10'
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kubernetes_ignore_preflight_errors: 'all'
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Options passed to `kubeadm init` when initializing the Kubernetes master.
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Options passed to `kubeadm init` when initializing the Kubernetes master. The `apiserver_advertise_address` defaults to `ansible_default_ipv4.address` if it's left empty.
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kubernetes_apt_release_channel: main
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kubernetes_apt_repository: "deb http://apt.kubernetes.io/ kubernetes-xenial {{ kubernetes_apt_release_channel }}"
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@ -54,9 +63,9 @@ Yum repository options for Kubernetes installation.
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None.
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## Example Playbook
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## Example Playbooks
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For a single node (master) Kubernetes cluster:
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### Single node (master-only) cluster
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```yaml
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- hosts: all
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@ -69,6 +78,35 @@ For a single node (master) Kubernetes cluster:
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- geerlingguy.kubernetes
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```
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### Two or more nodes (single master) cluster
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Master inventory vars:
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```yaml
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kubernetes_role: "master"
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```
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Node(s) inventory vars:
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```yaml
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kubernetes_role: "node"
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```
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Playbook:
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```yaml
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- hosts: all
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vars:
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kubernetes_allow_pods_on_master: True
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roles:
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- geerlingguy.docker
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- geerlingguy.kubernetes
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```
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Then, log into the Kubernetes master, and run `kubectl get nodes` as root, and you should see a list of all the servers.
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## License
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MIT / BSD
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@ -9,12 +9,16 @@ kubernetes_packages:
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- name: kubernetes-cni
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state: present
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kubernetes_role: master
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kubernetes_kubelet_extra_args: ""
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kubernetes_allow_pods_on_master: True
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kubernetes_enable_web_ui: True
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kuberenetes_debug: False
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kubernetes_pod_network_cidr: '10.0.1.0/16'
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kubernetes_apiserver_advertise_address: ''
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kubernetes_version: 'stable-1.10'
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kubernetes_ignore_preflight_errors: 'all'
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@ -35,57 +35,17 @@
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path: /etc/kubernetes/admin.conf
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register: kubernetes_init_stat
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- name: Initialize the Kubernetes master with kubeadm init.
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command: >
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kubeadm init
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--pod-network-cidr={{ kubernetes_pod_network_cidr }}
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--apiserver-advertise-address={{ ansible_default_ipv4.address }}
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--kubernetes-version {{ kubernetes_version }}
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--ignore-preflight-errors={{ kubernetes_ignore_preflight_errors }}
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register: kubeadmin_init
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failed_when: False
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when: kubernetes_init_stat.stat.exists == False
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# Set up master.
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- include_tasks: master-setup.yml
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when: kubernetes_role == 'master'
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- name: Print the init output to screen.
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debug: var=kubeadmin_init.stdout
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when: kubernetes_init_stat.stat.exists == False
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- name: Ensure .kube directory exists.
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file:
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path: ~/.kube
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state: directory
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- name: Symlink the kubectl admin.conf to ~/.kube/conf.
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file:
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src: /etc/kubernetes/admin.conf
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dest: ~/.kube/config
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state: link
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- name: Configure Flannel networking.
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command: "{{ item }}"
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with_items:
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- kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
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- kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/k8s-manifests/kube-flannel-rbac.yml
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register: flannel_result
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changed_when: "'created' in flannel_result.stdout"
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# TODO: Check if taint exists with something like `kubectl describe nodes`
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# instead of using kubernetes_init_stat.stat.exists check.
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- name: Allow pods on master node (if configured).
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command: "kubectl taint nodes --all node-role.kubernetes.io/master-"
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when:
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- kubernetes_allow_pods_on_master
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- kubernetes_init_stat.stat.exists == False
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- name: Check if Kubernetes Dashboard UI service already exists.
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shell: kubectl get services --namespace kube-system | grep -q kubernetes-dashboard
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# Set up nodes.
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- name: Get the kubeadm join command from the Kubernetes master.
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shell: kubeadm token create --print-join-command
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changed_when: False
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failed_when: False
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register: kubernetes_dashboard_service
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when: kubernetes_enable_web_ui
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when: kubernetes_role == 'master'
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run_once: True
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register: kubernetes_join_command
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- name: Enable the Kubernetes Web Dashboard UI (if configured).
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command: "kubectl create -f https://raw.githubusercontent.com/kubernetes/dashboard/master/src/deploy/recommended/kubernetes-dashboard.yaml"
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when:
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- kubernetes_enable_web_ui
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- kubernetes_dashboard_service is failed
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- include_tasks: node-setup.yml
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when: kubernetes_role == 'node'
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57
tasks/master-setup.yml
Normal file
57
tasks/master-setup.yml
Normal file
@ -0,0 +1,57 @@
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---
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- name: Initialize Kubernetes master with kubeadm init.
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command: >
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kubeadm init
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--pod-network-cidr={{ kubernetes_pod_network_cidr }}
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--apiserver-advertise-address={{ kubernetes_apiserver_advertise_address | default(ansible_default_ipv4.address) }}
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--kubernetes-version {{ kubernetes_version }}
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--ignore-preflight-errors={{ kubernetes_ignore_preflight_errors }}
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register: kubeadmin_init
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failed_when: False
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when: kubernetes_init_stat.stat.exists == False
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- name: Print the init output to screen.
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debug: var=kubeadmin_init.stdout
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when:
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- kuberenetes_debug
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- kubernetes_init_stat.stat.exists == False
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- name: Ensure .kube directory exists.
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file:
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path: ~/.kube
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state: directory
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- name: Symlink the kubectl admin.conf to ~/.kube/conf.
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file:
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src: /etc/kubernetes/admin.conf
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dest: ~/.kube/config
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state: link
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- name: Configure Flannel networking.
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command: "{{ item }}"
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with_items:
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- kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
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- kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/k8s-manifests/kube-flannel-rbac.yml
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register: flannel_result
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changed_when: "'created' in flannel_result.stdout"
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# TODO: Check if taint exists with something like `kubectl describe nodes`
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# instead of using kubernetes_init_stat.stat.exists check.
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- name: Allow pods on master node (if configured).
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command: "kubectl taint nodes --all node-role.kubernetes.io/master-"
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when:
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- kubernetes_allow_pods_on_master
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- kubernetes_init_stat.stat.exists == False
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- name: Check if Kubernetes Dashboard UI service already exists.
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shell: kubectl get services --namespace kube-system | grep -q kubernetes-dashboard
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changed_when: False
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failed_when: False
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register: kubernetes_dashboard_service
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when: kubernetes_enable_web_ui
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- name: Enable the Kubernetes Web Dashboard UI (if configured).
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command: "kubectl create -f https://raw.githubusercontent.com/kubernetes/dashboard/master/src/deploy/recommended/kubernetes-dashboard.yaml"
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when:
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- kubernetes_enable_web_ui
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- kubernetes_dashboard_service is failed
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5
tasks/node-setup.yml
Normal file
5
tasks/node-setup.yml
Normal file
@ -0,0 +1,5 @@
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---
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- name: Join node to Kubernetes master
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shell: >
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{{ kubernetes_join_command.stdout }}
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creates=/etc/kubernetes/kubelet.conf
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