playbook忽略错误

默认playbook会检测task执行的返回状态，如果遇到错误则会立即终止playbook的后续task执行，然而有些时候playbook即使执行错误了也要让其继续执行。

加入参数：ignore_errors:yes 忽略错误

    - name: Get PHP Install status
      shell: "rpm -qa | grep php"
      ignore_errors: yes
      register: get_php_install_status

    - name: Install PHP Server
      shell: yum localinstall -y /tmp/*.rpm
      when:
        - ansible_fqdn is match "web*"
        - get_php_install_status.rc != 0