"WordPress Migrations Done Right" - my talk from WCEU

1. WORDPRESS
MIGRATIONS
DONE RIGHT

4. @dvkanchev
siteground.com

5. 1. PREPARATION
2. DRY RUN
3. REAL MIGRATION

6. the
PREPARATION

7. WEBSITE TRAFFIC

8. USERS’ HABITS

9. PROMOTIONS

10. ASK USERS WHEN
TO MIGRATE

11. INFORM
EVERYONE

12. INFORM
EVERYONE
1. Notify Existing Users

13. PREPARE FOR
DOWNTIME

14. PREPARE FOR
DOWNTIME
1. Create a Maintenance Page

15. the
PREPARATION
Recap

16. Choose The Best Time
Inform Your Visitors
Prepare For Downtime

17. the
DRY RUN

18. WHAT IS
A DRY RUN
MIGRATION?

19. ALWAYS PERFORM
A DRY RUN !!!

21. CREATE BACKUP

22. CREATE BACKUP
1. USE SSH COMMANDS
2. USE WORDPRESS PLUGINS
3. USE PLATFORM TOOLS

23. MY CHOICE
mysqldump danielka_wslp254
> db_backup.sql
!
tar zcvf backup.tar.gz
public_html

24. TRANSFER BACKUP

25. MY CHOICE
rsync -e "ssh -p 22" -rlptDH
--delete /home/BACKUP_FILE
server.com:/home/

26. OTHER TOOLS
1. WordPress Plugins
2. WP-CLI
3. cPanel pkgacct/restorepkg
4. FTP, scp, etc.

27. RESTORE BACKUP

28. TEST FROM
NEW SERVER

29. LOCAL HOSTS FILE
181.224.135.75 domain.com
181.224.135.75 www.domain.com
181.224.128.31 shop.domain.com

30. NOT INVENTED
while ($WP_broken=TRUE) {
wp_resolve_issue();
$Damn_it++;
}

31. EXAMPLE 1
PHP SERIALIZED
DATA

32. Before Migration
After Migration
a:2:{i:0;s:11:”website.com”;i:1;s:0:””;}
a:2:{i:0;s:11:”new.website.com”;i:1;s:0:””;}

33. SOLUTIONS
1. WP-CLI
wp search-replace domain.com new.domain.com
2. http://goo.gl/E4R4Wh

34. EXAMPLE 2
SPECIALIZED
WP HOSTS

35. WP-CONFIG.PHP
$varnish=array ( 0 => 'pod-1191', );
$memcached_servers=array (155.2.4.1 );
define( ‘ROOT_FOLDER', '/nas/wp' );

36. the
DRY RUN
Recap

37. What Is a Dry Run?
Backup->Transfer->Restore
Test And Resolve Issues

38. the REAL
MIGRATION

39. MAINTENANCE
MODE

40. SOME .htaccess
TRICKS

41. THE CODE
RewriteEngine On
RewriteCond %{REMOTE_ADDR} !^123.56.89.12
RewriteCond %{DOCUMENT_ROOT}/maintenance.html -f
RewriteCond %{DOCUMENT_ROOT}/maintenance.enable -f
RewriteCond %{SCRIPT_FILENAME} !maintenance.html
RewriteRule ^.*$ /maintenance.html [R=503,L]
ErrorDocument 503 /maintenance.html
Header Set Retry-After “14400"
Header Set Cache-Control "max-age=0, no-store"

42. FINAL DATA SYNC

43. FINAL DATA SYNC
rsync -e "ssh -p 22" -aHp --
delete /home/SITE/
server.com:/home/SITE/

44. DNS PROPAGATION

45. DNS PROPAGATION
OLD SERVER NEW SERVER

46. SOLUTION 1
REMOTE MYSQL
OLD SERVER NEW SERVER

47. SOLUTION 2
IPTABLES REDIRECT
OLD SERVER NEW SERVER

48. IPTABLES TRAFFIC
REDIRECT
sysctl -w net.ipv4.ip_forward=1
iptables -P FORWARD ACCEPT
iptables -F FORWARD
iptables -t nat -F PREROUTING
iptables -t nat -F POSTROUTING
iptables -t nat -I PREROUTING -j DNAT -d $OLD_IP --to $NEW_IP
iptables -t nat -I POSTROUTING -j SNAT -d $NEW_IP --to $OLD_IP

49. FINAL CHECKS AND
MODIFICATIONS

50. the REAL
Recap
MIGRATION

51. Maintenance Mode
Final Data Sync
DNS and Data Loss

52. FAQ

53. QUESTIONS ?

54. THANK YOU!
@dvkanchev
daniel.k@siteground.com