23.backup.yml

# cluster-backup playbook
# read the guide: 'op/cluster_restore.md'

- hosts:
  - localhost
  tasks:
  # step1: find a healthy member in the etcd cluster 
  - name: set NODE_IPS of the etcd cluster
    set_fact: NODE_IPS="{% for host in groups['etcd'] %}{{ host }} {% endfor %}"

  - name: get etcd cluster status
    shell: 'for ip in {{ NODE_IPS }};do \
              ETCDCTL_API=3 {{ base_dir }}/bin/etcdctl \
              --endpoints=https://"$ip":2379 \
              --cacert={{ base_dir }}/.cluster/ssl/ca.pem \
              --cert={{ base_dir }}/.cluster/ssl/admin.pem \
              --key={{ base_dir }}/.cluster/ssl/admin-key.pem \
              endpoint health; \
            done'
    register: ETCD_CLUSTER_STATUS
    ignore_errors: true

  - debug: var="ETCD_CLUSTER_STATUS.stdout"

  - name: get a running ectd node
    shell: 'echo -e "{{ ETCD_CLUSTER_STATUS.stdout }}"|grep "is healthy"|sed -n "1p"|cut -d: -f2|cut -d/ -f3'
    register: RUNNING_NODE

  - debug: var="RUNNING_NODE.stdout"

  # step2: backup data on the healthy member
  - name: make a backup on etcd node
    shell: "mkdir -p /etcd_backup && cd /etcd_backup && \
        ETCDCTL_API=3 {{ bin_dir }}/etcdctl snapshot save snapshot.db"
    args:
      warn: false
    delegate_to: "{{ RUNNING_NODE.stdout }}"

  - name: fetch the backup data
    fetch:
      src: /etcd_backup/snapshot.db
      dest: "{{ base_dir }}/.cluster/backup/"
      flat: yes
    delegate_to: "{{ RUNNING_NODE.stdout }}"

- hosts:
  - localhost
  tasks:
  - name: Backing up ansible hosts-1
    copy:
      src: "{{ base_dir }}/hosts"
      dest: "{{ base_dir }}/.cluster/backup/hosts"
    register: p

  - name: Backing up ansible hosts-2
    shell: "cd {{ base_dir }}/.cluster/backup && \
	cp -fp hosts hosts-$(date +'%Y%m%d%H%M')"
    when: 'p is changed'

  - name: Backing up etcd snapshot with datetime
    shell: "cd {{ base_dir }}/.cluster/backup && \
	cp -fp snapshot.db snapshot-$(date +'%Y%m%d%H%M').db"