How do I disable all comments on my WordPress site?

Comments on new posts can be disabled under Settings/Discussion in the admin interface. Unclick “Allow people to post comments on new articles “.

wp-disable-comments

This, however, will not disable comments on any posts that already exist. For those, you can issue this line of SQL:

mysql> UPDATE wp_posts p SET comment_status = 'closed', ping_status = 'closed' WHERE comment_status = 'open';
Query OK, 18557 rows affected (0.13 sec)
Rows matched: 18557  Changed: 18557  Warnings: 0

mysql>

If you have WP-CLI, you can access the SQL command-line with the “wp db cli” command:

$ wp db cli
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 82479
Server version: 5.5.40-0+wheezy1 (Debian)

Copyright (c) 2000, 2014, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> UPDATE wp_posts SET comment_status = 'closed', ping_status = 'closed' WHERE comment_status = 'open';
Query OK, 0 rows affected (0.04 sec)
Rows matched: 0  Changed: 0  Warnings: 0

mysql>
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