def exists(instance_id=None, name=None, tags=None, region=None, key=None,
           keyid=None, profile=None, in_states=None, filters=None):
    '''
    Given an instance id, check to see if the given instance id exists.

    Returns True if the given instance with the given id, name, or tags
    exists; otherwise, False is returned.

    CLI Example:

    .. code-block:: bash

        salt myminion boto_ec2.exists myinstance
    '''
    instances = find_instances(instance_id=instance_id, name=name, tags=tags,
                               region=region, key=key, keyid=keyid,
                               profile=profile, in_states=in_states, filters=filters)
    if instances:
        log.info('Instance exists.')
        return True
    else:
        log.warning('Instance does not exist.')
        return False
Given an instance id, check to see if the given instance id exists.

    Returns True if the given instance with the given id, name, or tags
    exists; otherwise, False is returned.

    CLI Example:

    .. code-block:: bash

        salt myminion boto_ec2.exists myinstance