“However, the ephemeral nature of container storage can be relatively easily addressed by accessing persistent local or network storage, not to mention various Docker storage management tools.” “As containers are being used beyond test, development and research and are finding themselves being moved into production roles, the technology also needs persistent storage,” said Greg Schulz, an analyst with StorageIO Group. This issue of Docker storage has become particularly urgent with Docker now moving from being merely the subject of industry conversation and the early adoption into large-scale customer deployment.
You would need external methods outside of Docker to move the host storage to a new host.” “You can get around that by using storage from the host that the container is running on, but then you can’t easily move the container to a new host. “Docker container storage is ephemeral, so when the container is removed, the storage is deleted,” said Eric Sites, CTO at Meros, a company that provides management, monitoring, logs and alerts for Docker.
#Convoy plugin vs docker for volume windows
Popular container technologies include Docker, Kubernetes, Mesos and DH2i’s D圎nterprise for Microsoft Windows Server applications and workloads.īut while containers offer many advantages, they also come with their own issues, particularly on the storage side. This saves time in creating apps and in setting up IT building blocks. Similarly, in IT, containers provide core functionality onto which customization and additional applications can be easily integrated. Regardless of whether goods are going by train, plane or boat, the same standardized container can be used to minimize time in unloading it from one mode of transportation and loading it into another. They promise to reduce the development and application integration process in a similar way as physical shipping containers revolutionized the business of transporting goods. (In this tutorial I’m also not adding additional security with Kerberos.Much has been written of late about Docker and other container technologies. The permissions should not be “squashed” at all. Next, make sure your Docker Swarm nodes are allowed to connect to NFS and have read/write permissions. Convoy will connect as this user to create Docker volumes. Create a new user and give it access to a new share (mine is /server_volumes). Make sure your NFS v3 server is up and running. For this tutorial, we will use NFS v3 since they are easy to set up together. Convoy supports several storage back-ends. Configure NFSįirst thing to do is configure NFS for use with Convoy. This tutorial’s instructions are based on Ubuntu 18.10, but they should work on most Docker installations. (Convoy’s devicemapper back-end won’t work here.) Also, I recommend avoiding Samba shares: Samba file permissions only support a single user ID, which wreaks havoc in containers that don’t use the same ID.
If you don’t want to use NFS v3, that’s okay - Convoy supports multiple storage back-ends - but you’ll definitely need to use network attached storage. If you haven’t set up a Docker Swarm yet, get at least 2 nodes ready by following these tutorials for Docker setup and Swarm setup. In this tutorial I assume you already have 2 or more nodes in a Docker Swarm and an NFS v3 server set up. With Docker, we will set up shared files with a volume plugin called Convoy. One way to make this easier is by sharing the files across multiple servers – no matter where it runs, the data will always be available.Īn important step in making highly available applications is setting up highly available data. Scaling an application is hard, especially when you need to manage its important data yourself.
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