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contrib/ansible: Remove duplication and redirect to new repository
Signed-off-by: Julien DOCHE <julien.doche@gmail.com>
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# Build a Kubernetes cluster using k3s via Ansible
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Author: <https://github.com/itwars>
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## K3s Ansible Playbook
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Build a Kubernetes cluster using Ansible with k3s. The goal is easily install a Kubernetes cluster on machines running:
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- [X] Debian
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- [ ] Ubuntu
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- [X] CentOS
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on processor architecture:
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- [X] x64
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- [X] arm64
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- [X] armhf
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## System requirements
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Deployment environment must have Ansible 2.4.0+
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Master and nodes must have passwordless SSH access
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## Usage
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Add the system information gathered above into a file called hosts.ini. For example:
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```bash
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[master]
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192.16.35.12
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[node]
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192.16.35.[10:11]
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[k3s-cluster:children]
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master
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node
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```
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Start provisioning of the cluster using the following command:
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```bash
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ansible-playbook site.yml -i inventory/hosts.ini
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```
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## Kubeconfig
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To get access to your **Kubernetes** cluster just
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```bash
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scp debian@master_pi:~/.kube/config ~/.kube/config
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```
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The ansible playbook was moved to https://github.com/rancher/k3s-ansible
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[defaults]
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roles_path = ./roles
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inventory = ./hosts.ini
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remote_tmp = $HOME/.ansible/tmp
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local_tmp = $HOME/.ansible/tmp
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pipelining = True
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become = True
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host_key_checking = False
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deprecation_warnings = False
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callback_whitelist = profile_tasks
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k3s_version: v0.8.1
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ansible_user: debian
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systemd_dir: /etc/systemd/system
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master_ip: "{{ hostvars[groups['master'][0]]['ansible_host'] | default(groups['master'][0]) }}"
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extra_server_args: ""
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[master]
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192.168.1.26
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[node]
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192.168.1.34
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192.168.1.39
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192.168.1.16
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192.168.1.32
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[k3s-cluster:children]
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master
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node
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---
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- hosts: k3s-cluster
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gather_facts: yes
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become: yes
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roles:
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- { role: reset }
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---
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- name: Delete k3s if already present
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file:
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path: /usr/local/bin/k3s
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state: absent
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- name: Download k3s binary x64
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get_url:
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url: https://github.com/rancher/k3s/releases/download/{{ k3s_version }}/k3s
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dest: /usr/local/bin/k3s
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owner: root
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group: root
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mode: 755
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# when: ( ansible_facts.userspace_architecture == "x86_64" )
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when: ( ansible_facts.architecture == "x86_64" )
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- name: Download k3s binary arm64
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get_url:
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url: https://github.com/rancher/k3s/releases/download/{{ k3s_version }}/k3s-arm64
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dest: /usr/local/bin/k3s
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owner: root
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group: root
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mode: 755
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when: ( ansible_facts.architecture is search("arm") )
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and
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( ansible_facts.userspace_bits == "64" )
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- name: Download k3s binary armhf
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get_url:
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url: https://github.com/rancher/k3s/releases/download/{{ k3s_version }}/k3s-armhf
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dest: /usr/local/bin/k3s
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owner: root
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group: root
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mode: 755
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when: ( ansible_facts.architecture is search("arm") )
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and
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( ansible_facts.userspace_bits == "32" )
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---
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- name: Copy K3s service file
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register: k3s_service
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template:
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src: "k3s.service.j2"
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dest: "{{ systemd_dir }}/k3s.service"
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owner: root
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group: root
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mode: 0755
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- name: Enable and check K3s service
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systemd:
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name: k3s
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daemon_reload: yes
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state: restarted
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enabled: yes
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- name: Wait for node-token
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wait_for:
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path: /var/lib/rancher/k3s/server/node-token
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- name: Register node-token file access mode
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stat:
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path: /var/lib/rancher/k3s/server
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register: p
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- name: Change file access node-token
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file:
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path: /var/lib/rancher/k3s/server
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mode: "g+rx,o+rx"
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- name: Read node-token from master
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slurp:
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src: /var/lib/rancher/k3s/server/node-token
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register: node_token
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- name: Store Master node-token
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set_fact:
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token: "{{ node_token.content | b64decode | regex_replace('\n', '') }}"
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- name: Restore node-token file access
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file:
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path: /var/lib/rancher/k3s/server
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mode: "{{ p.stat.mode }}"
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- name: Create directory .kube
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file:
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path: ~{{ ansible_user }}/.kube
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state: directory
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owner: "{{ ansible_user }}"
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- name: Copy config file to user home directory
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copy:
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src: /etc/rancher/k3s/k3s.yaml
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dest: ~{{ ansible_user }}/.kube/config
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remote_src: yes
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owner: "{{ ansible_user }}"
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- name: Replace https://localhost:6443 by https://master-pi:6443
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command: k3s kubectl config set-cluster default
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--server=https://{{ master_ip }}:6443
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--kubeconfig ~{{ ansible_user }}/.kube/config
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- name: Create kubectl symlink
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file:
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src: /usr/local/bin/k3s
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dest: /usr/local/bin/kubectl
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state: link
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- name: Create crictl symlink
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file:
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src: /usr/local/bin/k3s
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dest: /usr/local/bin/crictl
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state: link
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[Unit]
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Description=Lightweight Kubernetes
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Documentation=https://k3s.io
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After=network-online.target
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[Service]
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Type=notify
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ExecStartPre=-/sbin/modprobe br_netfilter
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ExecStartPre=-/sbin/modprobe overlay
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ExecStart=/usr/local/bin/k3s server {{ extra_server_args | default("") }}
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KillMode=process
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Delegate=yes
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# Having non-zero Limit*s causes performance problems due to accounting overhead
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# in the kernel. We recommend using cgroups to do container-local accounting.
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LimitNOFILE=1048576
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LimitNPROC=infinity
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LimitCORE=infinity
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TasksMax=infinity
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TimeoutStartSec=infinity
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Restart=always
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RestartSec=5s
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[Install]
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WantedBy=multi-user.target
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---
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- name: Copy K3s service file
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template:
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src: "k3s.service.j2"
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dest: "{{ systemd_dir }}/k3s-node.service"
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owner: root
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group: root
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mode: 0755
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- name: Enable and check K3s service
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systemd:
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name: k3s-node
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daemon_reload: yes
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state: restarted
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enabled: yes
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[Unit]
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Description=Lightweight Kubernetes
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Documentation=https://k3s.io
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After=network-online.target
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[Service]
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Type=notify
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ExecStartPre=-/sbin/modprobe br_netfilter
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ExecStartPre=-/sbin/modprobe overlay
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ExecStart=/usr/local/bin/k3s agent --server https://{{ master_ip }}:6443 --token {{ hostvars[groups['master'][0]]['token'] }}
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KillMode=process
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Delegate=yes
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# Having non-zero Limit*s causes performance problems due to accounting overhead
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# in the kernel. We recommend using cgroups to do container-local accounting.
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LimitNOFILE=1048576
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LimitNPROC=infinity
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LimitCORE=infinity
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TasksMax=infinity
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TimeoutStartSec=infinity
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Restart=always
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RestartSec=5s
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[Install]
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WantedBy=multi-user.target
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---
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- name: Set SELinux to disabled state
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selinux:
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state: disabled
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when: ansible_distribution == 'CentOS' or ansible_distribution == 'Red Hat Enterprise Linux'
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- name: Enable IPv4 forwarding
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sysctl:
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name: net.ipv4.ip_forward
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value: "1"
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state: present
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reload: yes
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- name: Enable IPv6 forwarding
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sysctl:
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name: net.ipv6.conf.all.forwarding
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value: "1"
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state: present
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reload: yes
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- name: Set bridge-nf-call-iptables (just to be sure)
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sysctl:
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name: net.bridge.bridge-nf-call-iptables
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value: "1"
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state: present
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reload: yes
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when: ansible_distribution == 'CentOS' or ansible_distribution == 'Red Hat Enterprise Linux'
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- name: Set bridge-nf-call-ip6tables (just to be sure)
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sysctl:
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name: net.bridge.bridge-nf-call-iptables
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value: "1"
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state: present
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reload: yes
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when: ansible_distribution == 'CentOS' or ansible_distribution == 'Red Hat Enterprise Linux'
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---
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- name: Test for Raspbian
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stat:
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path: /boot/cmdline.txt
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register: cmdline
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- name: Activating cgroup on Raspbian
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lineinfile:
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path: /boot/cmdline.txt
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regexp: '^(.*rootwait)$'
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line: '\1 cgroup_enable=cpuset cgroup_memory=1 cgroup_enable=memory'
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backrefs: true
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when: ( cmdline.stat.path is defined )
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and
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( ansible_facts.architecture is search("arm") )
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register: boot_cmdline
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- name: Rebooting on Raspbian
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shell: reboot now
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ignore_errors: true
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when: ( boot_cmdline is changed )
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and
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( ansible_facts.architecture is search("arm") )
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---
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- name: Disable services
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systemd:
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name: "{{ item }}"
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state: stopped
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enabled: no
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with_items:
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- k3s
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- k3s-node
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- name: Remove service files, binaries and data
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file:
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name: "{{ item }}"
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state: absent
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with_items:
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- "{{ systemd_dir }}/k3s.service"
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- "{{ systemd_dir }}/k3s-node.service"
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- /etc/rancher/k3s
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- /var/lib/rancher/k3s
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- /var/lib/kubelet
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- /usr/local/bin/k3s
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- name: daemon_reload
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systemd:
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daemon_reload: yes
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---
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- hosts: k3s-cluster
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gather_facts: yes
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become: yes
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roles:
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- { role: prereq }
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- { role: download }
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- { role: raspbian }
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- hosts: master
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# gather_facts: yes
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become: yes
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roles:
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- { role: k3s/master }
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- hosts: node
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# gather_facts: yes
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become: yes
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roles:
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- { role: k3s/node }
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