Hello,
By default, CE uses kaltura-nginx which is compiled with the nginx-vod-module to serve entries in HLS, HDS and DASH formats.
You are prompted about the hostname to use for Nginx during the configuration phase, in the manifest example you posted, Nginx listens on port 88 with the servername mykaltura.url.
If you wish to use your own CDN instead, you need to go to Admin Console->your partner->profiles->delivery profiles and input the relevant params, also, to push the entries to your own CDN, you need to configure a remote storage profile, again from Admin Console->your partner->profiles->Remote Storage.
The profiles, including the default ones to be used with kaltura-nginx, are stored in the kaltura.delivery_profile.
# mysql -h$DB1_HOST -u$DB1_USER -p$DB1_PASS $DB1_NAME
mysql> select id, partner_id,name,url,host_name from delivery_profile;
The profiles that belong to partner_id 0 are the default ones and are shared between all partners, if you create a profile for a specific partner and set it as default, it will be used instead of the profiles that belong to partner ID 0.
Hope this helps,