舊年係GCP用”WordPress Certified by Bitnami”，原來佢地個個Base Image 係Debian 8. 上兩個月收到通知要更新，今個weekend趁住有時間順便一次過upgrade。今次會試下”Nginx WordPress with NGINX and SSL Certified by Bitnami“，睇下用Nginx會唔會快過Apache。
1. New VM
首先登入GCP，左上角Menu > MarketPlace，然後搜尋 WordPress，再揀Nginx WordPress with NGINX and SSL Certified by Bitnami，按Launch on Compute Engine button。
因為Free Tier 嘅關係，記住要揀係美國嘅region，同 f1-micro instance. Disk size 30GB 以下就得, 我自己用15GB. info: https://cloud.google.com/compute/pricing#freeusage
2. Backup
等緊個VM create嘅時候，可以就係用緊嘅WordPress 做 Backup。Install “All-in-One WP Migration” plugin, Export everything. 詳細資料：https://docs.bitnami.com/aws/how-to/migrate-wordpress/，Backup 完然後power off
3. Migrate
個新VM 起好之後，In VPC network > External IP address，這個舊嘅static IP 轉去新 VM 到，然後ssh to new VM, restart all services
再登入新WordPress，check 返site setting同user email address ，如果係 IP address 就改番做Domain name。
終於係時候Import返 data： All-in-One WP Migration > Import，upload the backup file.
Disable bitnami logo:
搞掂。
當一切安好之後，就可以Delete 舊VM & snapshot。
(Optional 1)
用Let’s encrypt & Cloudflare SSL strict mode:
一直用開 Cloudflare 免費CDN & FleixSSL，而家用 Lets encrtpy 其實可以唔使用 Cloudflare SSL, 不過費事大搞, 轉做strict mode 算.
in ssh shell:
我揀左 Yes 但係個crontab 都係冇野，要手動加返上去。
(Optional 2)
redirect HTTP to HTTPS in nginx
如果唔用 Cloudflare redirect，可以係Nginx 做，改 server_name 同埋加 301 ：
Reference: