Re: [lxc-users] LXC copy snapshots only to remote?

[Lai Wei-Hwa]

Hi Fajar, 

Yes, I'm aware of other alternatives. My question is geared towards how LXD/LXC 
works with snapshots. 

Thanks! 
Lai 


From: "Fajar A. Nugraha" <l...@fajar.net> 
To: "lxc-users" <lxc-users@lists.linuxcontainers.org> 
Sent: Wednesday, March 7, 2018 2:40:59 PM 
Subject: Re: [lxc-users] LXC copy snapshots only to remote? 

On Thu, Mar 8, 2018 at 1:49 AM, Lai Wei-Hwa < [ mailto:wh...@robco.com | 
wh...@robco.com ] > wrote: 



Thanks Fajar, 

I'm more interested in if I'm right or wrong and why that's the case. 

Incremental snapshot support is in LXD 3.0 but I'm asking in relation to LXC, 
not LXD. And I'm really looking to clear up my (mis)understanding. 





Ah, I must not have the most recent info then. 

Regardles when (or if) the devs decided to implement it in lxc (even support in 
lxd seems not completed yet: [ https://github.com/lxc/lxd/issues/3326 | 
https://github.com/lxc/lxd/issues/3326 ] ), you could always perform 
storage-level backup yourself. Particularly handy if you have lots of 
containers, use zfs, and use recursive incremental send. 

-- 
Fajar 

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Re: [lxc-users] LXC copy snapshots only to remote?

[Marat Khalili]

> If I'm right, how do I copy SC by itself (and not the whole container) to H2 
> on Wednesday?

You can be right, but developers just didn't create lxc- command for this. Did 
you try to simply copy SC files over C2 and run the result? LXC 1.0 command 
layer is very thin, you can observe and emulate results of most of them.
-- 

With Best Regards,
Marat Khalili
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Re: [lxc-users] LXC copy snapshots only to remote?

[Fajar A. Nugraha]

On Thu, Mar 8, 2018 at 1:49 AM, Lai Wei-Hwa  wrote:

> Thanks Fajar,
>
> I'm more interested in if I'm right or wrong and why that's the case.
>
> Incremental snapshot support is in LXD 3.0 but I'm asking in relation to
> LXC, not LXD. And I'm really looking to clear up my (mis)understanding.
>
>

Ah, I must not have the most recent info then.

Regardles when (or if) the devs decided to implement it in lxc (even
support in lxd seems not completed yet:
https://github.com/lxc/lxd/issues/3326), you could always perform
storage-level backup yourself. Particularly handy if you have lots of
containers, use zfs, and use recursive incremental send.

-- 
Fajar
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Re: [lxc-users] LXC copy snapshots only to remote?

[Lai Wei-Hwa]

Thanks Fajar, 

I'm more interested in if I'm right or wrong and why that's the case. 

Incremental snapshot support is in LXD 3.0 but I'm asking in relation to LXC, 
not LXD. And I'm really looking to clear up my (mis)understanding. 


Thanks! 
Lai 


From: "Fajar A. Nugraha" <l...@fajar.net> 
To: "lxc-users" <lxc-users@lists.linuxcontainers.org> 
Sent: Wednesday, March 7, 2018 1:17:07 PM 
Subject: Re: [lxc-users] LXC copy snapshots only to remote? 

On Thu, Mar 8, 2018 at 12:03 AM, Lai Wei-Hwa < [ mailto:wh...@robco.com | 
wh...@robco.com ] > wrote: 



Hi Everyone, 

I'm probably not fully grasping how LXC containers/snapshotting works, but why 
isn't the following possible? 

HostContainer 
Monday 
Tuesday 
Wed 
Thurs 

H1 
C1 (fresh Ubuntu) 
SA (added apache) 
SB (removed apache and added nginx) 
SC (hardened nginx config) 
Host dies 

H2 
C2 (created from C1 Snapshot B) 


SC (with hardened nginx config) 


On Tuesday, I snapshot C1 (creating SB) and stop the container. I then jump on 
a new host (H2) and copy snapshot B: 

BQ_BEGIN

H2$ lxc copy H1:C1/SB C2 



At this point, my C2 is equivalent to C1 + SA + SB. Thus, I believe that C1 + 
SA + SB = C2 

On Wednesday, I take Snapshot C on H1. 

I believe that on Wednesday, after taking SC, I should be able to copy SC alone 
to H2. And then on Thursday, when H1 dies, I should be able to go to H2 and 
launch SC (C2 + SC) and have the same container I had on H! when I first took 
Snapshot C. 

If I'm wrong, why am I wrong? If I'm right, how do I copy SC by itself (and not 
the whole container) to H2 on Wednesday? 



BQ_END


I'm pretty sure lxc doesn't do incremental snapshots. 

To get what you want, you need to manage the storage snapshots (and incremental 
send) yourself. For example, if using zfs, you can use sanoid + syncoid. 

-- 
Fajar 

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Re: [lxc-users] LXC copy snapshots only to remote?

[Fajar A. Nugraha]

On Thu, Mar 8, 2018 at 12:03 AM, Lai Wei-Hwa  wrote:

> Hi Everyone,
>
> I'm probably not fully grasping how LXC containers/snapshotting works, but
> why isn't the following possible?
>
> *Host* *Container*
> *Monday*
> *Tuesday*
> *Wed*
> *Thurs*
> H1
> C1 (fresh Ubuntu)
> SA (added apache)
> SB (removed apache and added nginx)
> SC (hardened nginx config)
> Host dies
> H2
> C2 (created from C1 Snapshot B)
>
>
> SC (with hardened nginx config)
>
>
> On Tuesday, I snapshot C1 (creating SB) and stop the container. I then
> jump on a new host (H2) and copy snapshot B:
>
> *H2$  * lxc copy H1:C1/SB C2
>
> At this point, my C2 is equivalent to C1 + SA + SB. Thus, I believe that
> C1 + SA + SB = C2
>
> On Wednesday, I take Snapshot C on H1.
>
> I believe that on Wednesday, after taking SC, I should be able to copy SC
> *alone* to H2. And then on Thursday, when H1 dies, I should be able to go
> to H2 and launch SC (C2 + SC) and have the same container I had on H! when
> I first took Snapshot C.
>
> If I'm wrong, why am I wrong? If I'm right, how do I copy SC by itself
> (and not the whole container) to H2 on Wednesday?
>
>
>

I'm pretty sure lxc doesn't do incremental snapshots.

To get what you want, you need to manage the storage snapshots (and
incremental send) yourself. For example, if using zfs, you can use sanoid +
syncoid.

-- 
Fajar
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