Storage

Question 1

Storage location of non-persistent data

Answer 1

/var/lib/docker/Storage-driver/

Question 2

Third party drivers for persistent volumes

Answer 2

• block storage(amazon efs, open stack cindr) good for high performance
• file storage (uses protocol such as nfs, smb) good for high performance workloads
• object storage - large blobs that do not often change (amazon s3, sef, mino)

Question 3

Storage location of persistent data

Answer 3

/var/lib/docker/volumes/

Question 4

List all Docker volume commands

Answer 4

docker volume -h

Question 5

List all volumes

Answer 5

docker volume ls

Question 6

Create volume

Answer 6

docker volume create volume_name

Question 7

Get the flags available when creating a volume

Answer 7

docker volume create -h

Question 8

Inspecting a volume

Answer 8

docker volume inspect volume_name

Question 9

Deleting a volume

Answer 9

docker volume rm volume_name

Question 10

Removing all unused volumes

Answer 10

docker volume prune

Question 11

Bind mounts with mount flag type=bind

they are not managed by __docker volume__

Answer 11

docker container run -d –name container_name –mount type=bind,source=source,target=target_in_container image_name
example:
1. mkdir my_target
2 .docker container run -d \
–name nginx-bind-mount1 \
–mount type=bind,source=”$(pwd)”/me_target,target=/app nginx
3. touch my_target/file1
4. docker container exec -it nginx-bind-mount1 /bin/bash
5. ls /app => file1

Question 12

Bind mounts with volume flag

Answer 12

docker container run -d –name container_name –volume:source:target image_name
example:
1. docker container run -d –name nginx-bind-mount2 \
-v “$(pwd)”/my_new_target:/app nginx
creating my_new_target prior running a container is not necessary, this will be created automatically
2. docker container exec -it nginx-bind-mount2 touch /app/myfile
3. ls ~/my_new_target/ => myfile

Question 13

Bind mounts with mount flag type=volume

they are managed by __docker volume__

Answer 13

docker container run -d --name container_name --mount type=volume,source=source,target=target_in_container image_name
1. docker volume create html_volume
2 .docker container run -d \
  --name nginx-volume1 \
  --mount type=volume,source=html_volume,target=/usr/share/nginx/html/ \
nginx
3. docker volume inspect html_volume
4. Creating a volume using that volume flag
docker container run -d \
 --name nginx-volume2 \
 -v html_volume:/usr/share/nginx/html/ \
 nginx

Question 14

Using a read-only volume:

Answer 14

1. docker run -d \
   –name=nginx-volume3 \
   –mount source=html_volume,target=/usr/share/nginx/html,readonly \
   nginx
2. docker container exec -it nginx-volume3 /bin/bash
3. vim /usr/share/nginx/html/index.html => this is read only