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pct: add info about container storage

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Dietmar Maurer 2016-02-21 10:46:23 +01:00
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@ -59,8 +59,8 @@ Our primary goal is to offer an environment as one would get from a
VM, but without the additional overhead. We call this "System
Containers".
NOTE: If you want to run micro-containers with docker, it is best to
run them inside a VM.
NOTE: If you want to run micro-containers (with docker, rct, ...), it
is best to run them inside a VM.
Security Considerations
@ -97,6 +97,36 @@ will affect a random unprivileged user, and so would be a generic
kernel security bug rather than a LXC issue. LXC people think
unprivileged containers are safe by design.
Container Storage
-----------------
Traditional containers use a very simple storage model, only allowing
a single mount point, the root file system. This was further
restricted to specific file system types like 'ext4' and 'nfs'.
Additional mounts are often done by user provided scripts. This turend
out to be complex and error prone, so we trie to avoid that now.
Our new LXC based container model is more flexible regarding
storage. First, you can have more than a single mount point. This
allows you to choose a suitable storage for each application. For
example, you can use a relatively slow (and thus cheap) storage for
the container root file system. Then you can use a second mount point
to mount a very fast, distributed storage for your database
application.
The second big improvement is that you can use any storage type
supported by the {pve} storage library. That means that you can store
your containers on local 'lvmthin' or 'zfs', shared 'iSCSI' storage,
or even on distributed storage systems like 'ceph'. And it enables us
to use advanced storage features like snapshots and clones. 'vzdump'
can also use the snapshots feature to provide consistent container
backups.
Last but not least, you can also mount local devices directly, or
mount local directories using bind mounts. That way you can access
local storage inside containers with zero overhead. Such bind mounts
also provides an easy way to share data between different containers.
Managing Containers with 'pct'
------------------------------