Display all posts in a page template

page-all.php

<?php
/**
 * Template Name: All Posts
 *
 * This template lists all posts via WP_Query and get_posts();
 */
get_header();

      // WP_Query arguments
	$args = array (
		'posts_per_page'         => '-1',
		'ignore_sticky_posts'    => true,
		'order'                  => 'DESC',
		'orderby'                => 'date',
		'cache_results'          => true
	);

	// Hook into WP_Query and pass default arguments
	getposts = get_posts( $args );

	// Loop through each post
	foreach( $getposts as $post ) : ?>

	        <h1><?php the_title(); ?></h1>
	        <?php the_excerpt(); ?>

	<?php endforeach;

get_sidebar();
get_footer();