How Much Google Cloud Platform Charges on F1-Mirco VM

I have been using GCP for my small blog site for a while. It was not been charged much since the traffic is small, a couple of thousand visitors per day from the world. The GCP credit is still having more than $384 30 days before the trial day ended.

To better trace the charges, I decided to spin up another VM around 10PM Sep 28 2018 to track how much it will charge daily with this minimum f1-micro (1 vCPU, 0.6 GB memory) VM.

I choosed Ubuntu 16.04 (Xenial Xerus) on f1-micro. License is free for this OS. The only service enabled on this f1-micro VM is Mysql used as backend of my blog. FrontEnd is another PHP/APACHE VM hosting in another GCP account.  I have hardened the firewall rules to allow only MySQL in from a specific ip.

Based on the GCP Always Free Usage Limits, I should be able to have following services as free:

• 1 f1-micro VM instance per month (US regions, excluding Northern Virginia).
• 30 GB of Standard persistent disk storage per month.
• 5 GB of snapshot storage per month.
• 1 GB egress from North America to other destinations per month (excluding Australia and China).

1. First Two days 
Here is first 32 hours charges and checked on Sep 30 2018:

Basic there are two charges:

• Network InterZone Charges.
• Micro instance with burstable CPU running in Americas

 Google Cloud Platform network pricing page, ingress traffic is free, while egress traffic is charged based on the source and destination of such traffic. Also both Google and AWS charge $0.01 per GB for inter-zone networking. This cost will happen even two VMs are in the same zone. My Apache2/Php front end vm is in same zone as my Mysql back end vm , which is us-east1-b. I will need to double check this one after a couple of days. 

GCP warned me instance “mysql1” is overutilised and let me consider switching to the machine type: g1-small (1 vCPU, 1.7 GB memory).

Performance Warning

As to bustable CPU charges, I checked the monitoring logs, it happened at the beginning when I just created the vm and imported the data. Based on Google Compute Engine Pricing page,  “f1-micro instances get 0.2 of a vCPU and are allowed to burst up to a full vCPU for short periods. g1-small instances get 0.5 of a vCPU and are allowed to burst up to a full vCPU for short periods.”

I am guessing anytime if CPU is exceeding 20% usage, this charge kicks in. Here are two diagrams for first 32 hours and first 58 hours.

 

I got another $0.26 charges for last 26 hours because of burstable cpu usage.

2. Oct 1 CPU Usage and Cost

3. Oct 1-2 CPU Usage and Cost

Product	Usage	Cost
Network Inter Zone Egress	6.47 gibibyte	$0.08
Network Internet Egress from Americas to China	0 gibibyte	$0.00

4. Oct 1-3 Cost and CPU Usage

SKU	Product	Usage	Cost before credit
Network Inter Zone Egress	Compute Engine	9.39 gibibyte	$0.12
Network Internet Egress from Americas to China	Compute Engine	0 gibibyte	$0.00

5. Oct 1-4 Cost and CPU Usage

SKU	Product	Usage	Cost before credit
Network Inter Zone Egress	Compute Engine	11.22 gibibyte	$0.15
Network Internet Egress from Americas to China	Compute Engine	0 gibibyte	$0.00

6. Oct 1-9 Cost and CPU Usage

SKU	Product	Usage	Cost before credit	Last 7 Days
Network Inter Zone Egress	Compute Engine	16.45 gibibyte	$0.21
Network Internet Egress from Americas to China	Compute Engine	5.15 gibibyte	$0.00

7. Oct 1-16 Cost

References:

• Google Cloud Platform免費套餐下暗藏的收費陷阱
• HOWTO: Set maximum CPU consumption in percentage by any process
• 2 Ways to Limit CPU Usage of a Process in Linux