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Add subchapter about ACLs, and make even more clear what quotas are about

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Document that use of a tmpdir is recommended when doing a 'suspend'
backup to a NFS share.
This commit is contained in:
Emmanuel Kasper 2016-04-12 15:13:18 +02:00 committed by Dietmar Maurer
parent 78859703fd
commit 6c60aebf11
2 changed files with 18 additions and 4 deletions
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8
pct.adoc
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@ -401,6 +401,8 @@ Similarly device mounts are not managed by the storage, but for these the
Using quotas inside containers Using quotas inside containers
------------------------------ ------------------------------
Quotas allow to set limits inside a container for the amount of disk space
that each user can use.
This only works on ext4 image based storage types and currently does not work This only works on ext4 image based storage types and currently does not work
with unprivileged containers. with unprivileged containers.
@ -418,6 +420,12 @@ for every mountpoint by passing the mountpoint's path instead of just `/`.) Best
see the documentation specific to the distributiont running inside the see the documentation specific to the distributiont running inside the
container. container.
Using ACLs inside containers
----------------------------
The standard Posix Access Control Lists are also available inside containers.
ACLs allow you to set more detailed file ownership than the traditional user/
group/others model.
Container Advantages Container Advantages
-------------------- --------------------

14
vzdump.adoc
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@ -38,11 +38,17 @@ Stop the VM during backup. This results in a very long downtime.
`suspend` mode:: `suspend` mode::
For containers, this mode uses rsync to copy the VM data to a temporary For containers, this mode uses rsync to copy the container data to a temporary
location (see option `--tmpdir`). Then the VM is suspended and a second location (see option `--tmpdir`). Then the container is suspended and a second
rsync copies changed files. After that, the VM is started (resumed) rsync copies changed files. After that, the container is started (resumed)
again. This results in minimal downtime, but needs additional space again. This results in minimal downtime, but needs additional space
to hold the VM copy. to hold the container copy.
When the container is on a local filesystem and the target storage of the backup
is an NFS server, you should set `--tmpdir` to reside on a local filesystem too,
as this will result in a many fold performance improvement.
Use of a local `tmpdir` is also required if you want to backup in `suspend`
mode a local container using ACLs to an NFS server.
For QemuServer, this mode will suspend the VM, start For QemuServer, this mode will suspend the VM, start
a live backup, and resume the VM. a live backup, and resume the VM.