docker volumes [miguel angel torres egea]

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= docker volumes
/via: [[https://docs.docker.com/storage/volumes/]]
{{ :tech:docker:pasted:20200327-151948.png }}
  * bind mount: montaje clásico con ''-v'' sobre una estructura de directorios
  * tmpfs mount: almacenar data no persistente
  * volume:
    * gestionado desde cli docker
    * trasversal al OS


== --volume o --mount
  * desde la versión 17.06 ''--mount'' está también disponible en "standalone" contenedores (además de swarm)


== cli
===docker volume
  * ''create''
  * ''ls''
  * ''inspect''
  * ''rm''

=== docker run
  * ''--volume | -v''
    * ''[ volume_name | local_path | <nothing-for-anonymous-volume ] : path-in-container [ : [ ro ] ]''
  * ''--mount | -m''
    * ''type=[bind,volume,tmpfs], [ source|src= {name,path} ], destination|dst|target=<path-in-container>[,readonly][,volume-opt=<options]''

=== docker create



== examples
<code bash>
docker run -d \
  --name devtest \
  --mount source=myvol2,target=/app \ # -v myvol2:/app \
  nginx:latest
</code>
<code bash>
docker run -d \
  --name=nginxtest \
  --mount source=nginx-vol,destination=/usr/share/nginx/html \ #  -v nginx-vol:/usr/share/nginx/html \
  nginx:latest
</code>
<code bash>
$ docker run -d \
  --name=nginxtest \
  --mount source=nginx-vol,destination=/usr/share/nginx/html,readonly \ # -v nginx-vol:/usr/share/nginx/html:ro \
  nginx:latest
</code>

== volume drivers
=== vieux/sshfs
<code bash>
docker volume create --driver vieux/sshfs \
  -o sshcmd=test@node2:/home/test \
  -o password=testpassword \
  sshvolume
  
docker run -d \
  --name sshfs-container \
  --volume-driver vieux/sshfs \
  --mount src=sshvolume,target=/app,volume-opt=sshcmd=test@node2:/home/test,volume-opt=password=testpassword \
  nginx:latest
</code>

== volume services
=== nfs
<code bash>
# NFS v3
docker service create -d \
  --name nfs-service \
  --mount 'type=volume,source=nfsvolume,target=/app,volume-driver=local,volume-opt=type=nfs,volume-opt=device=:/var/docker-nfs,volume-opt=o=addr=10.0.0.10' \
  nginx:latest
  
# NFS v4
docker service create -d \
    --name nfs-service \
    --mount 'type=volume,source=nfsvolume,target=/app,volume-driver=local,volume-opt=type=nfs,volume-opt=device=:/,"volume-opt=o=10.0.0.10,rw,nfsvers=4,async"' \
    nginx:latest
</code>

== backup volumes
=== backup
<code bash>
docker run -v /dbdata --name dbstore ubuntu /bin/bash
docker run --rm --volumes-from dbstore -v $(pwd):/backup ubuntu tar cvf /backup/backup.tar /dbdata
</code>
=== restore
<code bash>
docker run -v /dbdata --name dbstore2 ubuntu /bin/bash
docker run --rm --volumes-from dbstore2 -v $(pwd):/backup ubuntu bash -c "cd /dbdata && tar xvf /backup/backup.tar --strip 1"
</code>