# WARNING: This playbook will erase the entire k8s-cluster, include PODs, ETCD data etc.
# Make sure you know what you are doing.

# to clean 'kube-node' nodes
- hosts:
  - kube-master
  - kube-node
  tasks:
  - name: stop and disable kube-node service
    service: name={{ item }} state=stopped enabled=no
    with_items:
    - kubelet
    - kube-proxy
    ignore_errors: true

  - name: umount kubelet filesystems
    shell: "mount | grep '/var/lib/kubelet'| awk '{print $3}'|xargs umount || exit 0"
    args:
      warn: false
    ignore_errors: true

  - name: remove files and dirs of 'kube-node' nodes
    file: name={{ item }} state=absent
    with_items:
    - "/var/lib/kubelet/"
    - "/var/lib/kube-proxy/"
    - "/etc/systemd/system/kubelet.service"
    - "/etc/systemd/system/kube-proxy.service"
    - "/opt/kube/kube-system/"

# to clean 'kube-master' nodes
- hosts:
  - kube-master
  tasks:
  - name: stop and disable kube-master service
    service: name={{ item }} state=stopped enabled=no
    with_items:
    - kube-apiserver
    - kube-controller-manager
    - kube-scheduler
    ignore_errors: true

  - name: remove files and dirs of 'kube-master' nodes
    file: name={{ item }} state=absent
    with_items:
    - "/var/run/kubernetes"
    - "/etc/systemd/system/kube-apiserver.service"
    - "/etc/systemd/system/kube-controller-manager.service"
    - "/etc/systemd/system/kube-scheduler.service"

# to clean container runtime and networking
- hosts:
  - kube-master
  - kube-node
  tasks:
  - block:
      - name: to check if container 'kubeasz' is running
        shell: 'docker ps|grep kubeasz || echo "NOT FOUND"'
        register: install_info
    
      - name: fail info
        fail: msg="you CAN NOT delete dockerd, because container 'kubeasz' is running!" 
        when: "'kubeasz' in install_info.stdout"
    
      - name: stop and disable docker service
        service: 
          name: docker
          state: stopped
          enabled: no
        ignore_errors: true
    
      # as k8s-network-plugins use host-network, '/var/run/docker/netns/default' must be umounted
      - name: unmount docker filesystem-1
        mount: path=/var/run/docker/netns/default state=unmounted
    
      - name: unmount docker filesystem-2
        mount: path=/var/lib/docker/overlay state=unmounted
    
      - name: remove files and dirs
        file: name={{ item }} state=absent
        with_items:
        - "/var/lib/docker/"
        - "/var/run/docker/"
        - "/etc/systemd/system/docker.service"
        - "/etc/systemd/system/docker.service.requires/"
        - "/etc/systemd/system/docker.service.d/"
        - "/etc/bash_completion.d/docker"
        - "/usr/bin/docker"
    when: CONTAINER_RUNTIME == 'docker'

  - block:
      - name: stop and disable containerd service
        service: 
          name: containerd
          state: stopped
          enabled: no
        ignore_errors: true

      - name: umount containerd filesystems
        shell: "mount | grep 'containerd/io.containerd'| awk '{print $3}'|xargs umount || exit 0"
        args:
          warn: false
        ignore_errors: true

      - name: remove files and dirs
        file: name={{ item }} state=absent
        with_items:
        - "/etc/containerd/"
        - "/etc/crictl.yaml"
        - "/etc/systemd/system/containerd.service"
        - "/opt/containerd/"
        - "/var/lib/containerd/"
        - "/var/run/containerd/"
    when: CONTAINER_RUNTIME == 'containerd'

  - name: remove files and dirs2
    file: name={{ item }} state=absent
    with_items:
    - "/etc/cni/"
    - "/run/flannel/"
    - "/etc/calico/"
    - "/var/run/calico/"
    - "/var/lib/calico/"
    - "/var/log/calico/"
    - "/etc/cilium/"
    - "/var/run/cilium/"
    - "/sys/fs/bpf/tc/"
    - "/var/lib/cni/"
    - "/var/lib/kube-router/"
    - "/opt/kube/kube-system/"
    - "/var/run/openvswitch/"
    - "/etc/origin/openvswitch/"
    - "/etc/openvswitch/"
    - "/var/log/openvswitch/"

  - name: cleanup iptables
    shell: "iptables -F && iptables -X \
	&& iptables -F -t nat && iptables -X -t nat \
	&& iptables -F -t raw && iptables -X -t raw \
	&& iptables -F -t mangle && iptables -X -t mangle"

  - name: cleanup networks1
    shell: "ip link del tunl0; \
	ip link del flannel.1; \
	ip link del cni0; \
        ip link del mynet0; \
	ip link del kube-bridge; \
        ip link del dummy0; \
        ip link del kube-ipvs0; \
        ip link del cilium_net; \
        ip link del cilium_vxlan; \
        ip link del ovn0; \
        ip link del ovs-system"
    ignore_errors: true

  - name: cleanup networks2
    shell: "ip link del docker0; \
	systemctl restart networking; \
	systemctl restart network"
    ignore_errors: true

  - name: cleanup 'calico' routes
    shell: "for rt in `ip route|grep bird|sed 's/blackhole //'|awk '{print $1}'`;do ip route del $rt;done;"
    when: "CLUSTER_NETWORK == 'calico'"
    ignore_errors: true

# to clean 'etcd' nodes
- hosts: etcd
  tasks:
  - name: stop and disable etcd service
    service:
      name: etcd
      state: stopped
      enabled: no
    ignore_errors: true

  - name: remove files and dirs
    file: name={{ item }} state=absent
    with_items:
    - "/var/lib/etcd"
    - "/etc/etcd/"
    - "/backup/k8s"
    - "/etc/systemd/system/etcd.service"

# to clean 'lb' nodes
- hosts:
  - kube-node
  - ex-lb
  tasks:
  - name: stop keepalived service
    shell: systemctl disable keepalived && systemctl stop keepalived
    ignore_errors: true

  - name: stop haproxy service
    shell: systemctl disable haproxy && systemctl stop haproxy
    ignore_errors: true

  - name: remove files and dirs
    file: name={{ item }} state=absent
    with_items:
    - "/etc/haproxy"
    - "/etc/keepalived"

# to clean ntp, certs and keys, env path
- hosts:
  - kube-master
  - kube-node
  - etcd
  - ex-lb
  tasks:
  - block:
      - name: stop and disable chrony in Ubuntu
        service: name=chrony state=stopped enabled=no
        ignore_errors: true
        when: 'ansible_distribution in ["Ubuntu","Debian"]'

      - name: stop and disable chronyd in CentOS/RedHat
        service: name=chronyd state=stopped enabled=no
        ignore_errors: true
        when: 'ansible_distribution in ["CentOS","RedHat","Amazon"]'
    when: "groups['chrony']|length > 0"

  - name: clean certs and keys
    file: name={{ item }} state=absent
    with_items:
    - "/etc/kubernetes/"
    - "{{ ca_dir }}" 
    - "/root/.kube/config"
    - "/etc/docker/"

  - name: clean 'ENV PATH'
    lineinfile:
      dest: ~/.bashrc
      state: absent
      regexp: '{{ item }}'
    with_items:
    - 'kubeasz'
    - 'helm completion'
    - 'kubectl completion'
    - 'crictl completion'
    - 'HELM_TLS_ENABLE'