CODEWITHSUNDEEP
google-cloud-platformgoogle-compute-enginegcloud
Waku-2
Waku-2

Reputation: 1196

mounting disk in GCP compute instance on Container Optimized OS [COS] created using gcloud console

So I am using this gcloud console command to create an instance from container image

gcloud compute instances create-with-container test-instance \
--zone us-xx \
--container-image asia.gcr.io/my-project/my-docker-image \
--container-privileged \
--network my-network \
--subnet my-net-sub \
--create-disk name=test-data,device-name=test-data,auto-delete=yes,size=200GB,type=pd-ssd \
--container-mount-disk name=test-data,mount-path=/mnt/disks/data \
--service-account [email protected]

which works fine and creates the instance, but it does not mount the data-disk. why? more precisely, to add the data disk I need to

How can I specify the create partition with ext4 and then mount the partition part?

Upvotes: 0

Views: 2068

Answers (1)

Wojtek_B
Wojtek_B

Reputation: 4443

You can't mount the host's disk to the container (use the same disk in both). You can however mount a directory or another disk. Either way you will be able to store data on it and both OS'es (host & container) will be able to read/write from it.

Let's say you want to store all data in the host OS disk in /datadir/ and you want it to be mounted inside the container under /mnt/disks/data. Below you will find a complete (and tested) example to use:

gcloud compute instances create-with-container mytestvm1 \
--zone=europe-west3-c \
--container-image=gcr.io/google-containers/mycontainer \
--container-privileged \
--network default \
--subnet default \
--create-disk name=test-data,device-name=test-data,auto-delete=yes,size=20GB,type=pd-ssd \
--container-mount-host-path=mount-path=/mnt/disks/data,host-path=/home/myhomedir/,mode=rw \
--service-account=my_service_account@developer.gserviceaccount.com

If you need another disk mounted then just change the line:

--container-mount-host-path=mount-path=/mnt/disks/data,host-path=/home/myhomedir/,mode=rw \

to

--container-mount-disk=mount-path=/mnt/disks/data,name=data1,mode=rw \

Upvotes: 6

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