From: Herbert Poetzl (herbert_at_13thfloor.at)
Date: Sun 22 Feb 2004 - 17:27:54 GMT
some people asked me about the 'advanced' features
FreeVPS provides over the Linux-Vserver patches ...
so here is the 'list' provided at the FreeVPS site
and my comments/questions to that ...
> FreeVPS extends the original Linux VServer functionality.
> FreeVPS implementation include FreeVPS kernel patch and FreeVPS
> tools. Together they add the following new features to VPS:
> * Limits on:
> - total memory usage
> - resident memory size
in Linux-VServer, VM is accounted and enforced, RSS only accounted,
I don't know what 'total memory usage' means ...
> - number of processes
is accounted and enforced, as all limits, can be changed at runtime
> - disk usage quota
this is handled by the Quota Disk Limit (included in the quota patch)
> - file handles
> - tcp sockets
both are not accounted yet, and not limited.
> * Advanced context management:
> - create/destroy a context
> - enter a context
well, that is basic functionality ...
> - running status
vserver-stat and /proc/virtual provide this ...
> - enable/disable creating new processes in a context
> - send signal to all processes in context
this is done with the vkill command (via syscall since 1.1.6)
> * inodes attributes management:
> - context tag
xid tagging is used by Quota Disk Limits and Per Context Quota
and it comes in 3 flavours (UID32/GID16, UID24/GID24 and UID32/GID32)
> - flag for files shared between contexts
don't know what this is, but might be the IUNLINK flag
> - immutable flag
well if that is what it says, then it's basic linux stuff
so after this shoot out ;) the following differences seem to remain:
> * Limits on: > - resident memory size > - file handles > - tcp sockets
> * Advanced context management: > - enable/disable creating new processes in a context
and I don't know the FreeVPS status of the following Linux-VServer features:
- vroot device (security) - Token Bucket scheduler stuff (Sam) - uts_name modifications (stealth) - procfs security - uptime virtualization - reboot userspace helper
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