Storing data within volumes allows different internal operations (e.g. redeploy of container with another tag version) to be performed without affecting or losing the data. To achieve such reliability, each volume content is packed into a separate .tar.gz archive and temporarily (i.e. for the duration of redeploy) moved to the physical server. When operation is finished, your custom volumes are returned to the updated node. This provides a high level of integrity for your data.
Below, we’ll consider how to add a custom volume for your container and types of data mounting the Jelastic PaaS provides - at a Local Filesystem, separate dedicated Data Container, layer Master Container or External NFS Server.